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Loligo
Temporal range: Eocene - recent[1]
Live specimen of L. vulgaris from the Belgian continental shelf, photographed on board the RV Belgica. (ML: 138 mm, MW: 39 mm)
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Myopsida
Family: Loliginidae
Genus: Loligo
Lamarck, 1798[2]
Type species
Loligo vulgaris
Lamarck, 1798
Synonyms

Pteroteuthis Ehrenberg, 1831

Loligo is a genus of squid and one of the most representative and widely distributed groups of myopsid squid.

The genus was first described by Jean Baptiste Lamarck in 1798. However, the name had been used earlier than Lamarck (Schneider, 1784; Linnaeus, 1758) and might even have been used by Pliny. In the early 19th century, this generic name was often used as a grouping for all true squid.

All three species of Loligo are caught by commercial fisheries, most abundantly by traditional trawling methods (mobile gear). In the United States of America, Longfin squid are federally regulated under the Atlantic Mackerel, Squid, and Butterfish Management Plan. Loligo vulgaris and others are noted for being attracted to lights at night; they can therefore be fished using different light-attraction methods. Commercial fishing is heavily regulated in the United States, and fishing using mobile gear is only permitted during daylight hours. However, the recreational fisherman is often found sitting by a light at the pier, happily jigging for squid with a rod and reel.

Loligo is the oldest true squid genus known from fossil remains; statoliths assigned to the extinct species Loligo applegatei are known from the early Eocene. In addition, a pyritized imprint of a Loligo squid is known from the Oligocene of Krasnodar, Russia, marking the first true squid known from a complete body fossil. The squid appears to have suffocated in anoxic bottom water while attempting to eat an extinct cutlassfish (Anenchelum).[1]

Species

[edit]

The recent classification of Vecchione et al. (2005)[1] and the Tree of Life Web Project (2010)[2] recognises only three species within Loligo, many others having been split off in other loliginid genera.

Synapomorphies

[edit]

Unlike many genera that can be described by commonalities inherited exclusively from their common ancestor, the classification of a species as being in the genus Loligo is not based on positive discrimination. The only positive distinction is not based on any form of inheritance and has to do with its Eastern Atlantic distribution. Other than this, the grounds for grouping a squid in this taxon is exclusively based on its lacking of characteristics that would put it in another taxon. Thus all squid in Loligo have rhomboidal fins as adults, elongated mantles, fins whose length exceeds their breadth, and lack photophores, but all other squid genera do as well.

Mating

[edit]

Mating in this genus is aseasonal. Such breeding is referred to as continuous breeding. Loligo squid gather near the surface of the water and males frenzy for females. Insertion of a sperm sac into the female is done with the tentacles of a male. The female then lays the fertilized eggs in roughly twenty jelly-filled sacs, each containing 200-300 eggs. Hatching occurs after three to four weeks, and complete sexual maturation takes roughly three years.

Educational uses

[edit]

Squid of the genus Loligo have widely been used in first year biology laboratories. Aside from being highly affordable, preserved and readily available for purchase online, the relative size of a specimen in this genus is perfect for laboratory use. Averaging at roughly 20 to 50 cm (8 to 20 inches) in length, the squid is small enough to fit on a typical dissection tray while large enough to have very visible structures for easy identifiability.

Human consumption

[edit]

Squid of genus Loligo are widely consumed by humans. In the United States, commercial fishing for squid is federally regulated and yearly quotas are set by NOAA. Even with all the squid caught and consumed by humans, it does not threaten the genus because of its members’ prolific breeding habits. Loligo squid are available for fishing all year round, within the limits of the federally set quotas, and this greatly increases their desirability for industrial fisheries. This squid, when cooked, is what is commonly called calamari.

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Loligo

View on Grokipedia
from Grokipedia
Loligo is a of squids in the family , class , comprising three accepted species: L. vulgaris (European squid), L. forbesii (veined squid), and L. reynaudii (Cape Hope squid). These species are neritic cephalopods inhabiting coastal and waters of the Atlantic Ocean and adjacent regions, including the , with L. vulgaris distributed from the to , L. forbesii in the northeast Atlantic from the to the and West African coast (approximately 20°N), and L. reynaudii off . Members of the genus Loligo are myopsid squids characterized by a streamlined, torpedo-shaped body, eight arms and two longer tentacles equipped with suckers, large complex eyes covered by a , and triangular fins that extend along much of the mantle length, enabling agile swimming. They exhibit rapid growth, reaching maturity within 6–12 months, and have short lifespans of 1–2 years, with semelparous involving demersal egg masses laid in communal beds on the seafloor. As visual predators, Loligo species primarily feed on fishes, crustaceans, and other cephalopods, using and via chromatophores for hunting and evasion. The genus holds significant ecological and economic importance, serving as key prey for marine predators such as seabirds, pinnipeds, and larger fishes, while supporting substantial commercial fisheries, particularly for L. vulgaris and L. reynaudii, which are harvested for food, bait, and scientific research. Taxonomic revisions have reduced the number of species in Loligo from over a dozen to the current three, with many former members reclassified into genera like Doryteuthis and Uroteuthis based on molecular and morphological analyses. Ongoing studies highlight their vulnerability to overfishing, climate change, and ocean acidification, underscoring the need for sustainable management.

Taxonomy

Classification

The genus Loligo belongs to the phylum , class , subclass , superorder , order , and family . This placement reflects its position among the myopsid squids, characterized by a closed ocular sinus and paralarval stages with protective membranes over the eyes. The name Loligo derives from the Latin term lōlīgō, historically used to denote a type of squid. First formally described by in 1798, the genus has been central to cephalopod taxonomy since the . Loligo holds evolutionary significance as one of the oldest genera of true squids, with fossil evidence from statoliths attributed to the extinct species Loligo applegatei dating to the Ypresian stage of the early Eocene, approximately 50 million years ago. This record underscores the genus's ancient origins within the Loliginidae, predating many modern squid lineages. Recent taxonomic revisions, informed by molecular phylogenies and morphological analyses, have refined the genus's composition by transferring certain species to related genera; for example, Loligo pealeii is now classified under Doryteuthis based on genetic evidence distinguishing Atlantic and Indo-Pacific clades. As of 2025, the consensus retains core species like L. vulgaris and L. forbesii within Loligo while recognizing these splits to better reflect evolutionary relationships.

Species

The genus Loligo currently includes three accepted , as recognized by modern taxonomic revisions that have reclassified numerous former congeners into distinct genera such as Doryteuthis, Uroteuthis, and Loliolus based on morphological, molecular, and biogeographic evidence. This restriction reflects efforts to resolve the polyphyletic nature of the genus, with only these species retaining the type characteristics of Loligo s.s., including a robust mantle, elongate fins, and specific arrangements. Loligo vulgaris Lamarck, 1798, commonly known as the , inhabits coastal and shelf waters of the eastern from the to , as well as the Mediterranean and Black Seas, at depths of 10–500 m. It attains a maximum mantle length of approximately 30–50 cm, with males generally larger than females, and supports major commercial fisheries in due to its abundance and fast growth. Distinctive traits include a cylindrical mantle with rhomboid fins covering about half the length and a reddish-brown chromatophore pattern that aids in over sandy or muddy substrates. Loligo forbesii Steenstrup, 1856, the veined squid, is distributed in the northeastern Atlantic from the northward to and the , extending into the western Mediterranean, typically at depths of 50–400 m. Adults reach mantle lengths of up to approximately 94 cm in males and 46 cm in females, featuring prominent veins on the fins and a slender body adapted for midwater schooling. It is a key target in mixed-species trawl fisheries and exhibits seasonal migrations tied to temperature preferences above 8.5°C. Loligo reynaudii d'Orbigny, 1839–1841, referred to as the Cape Hope squid or chokka, occurs along the southeastern coast of from to the , in neritic waters up to 400 m deep. This species grows to a mantle length of about 40 cm and weights exceeding 1 kg, with males larger than females, reaching up to approximately 42 cm ML, and a narrow, elongate mantle and fins spanning nearly the full posterior length, enabling agile swimming in variable upwelling environments. It forms the basis of 's largest squid fishery, jigged commercially during spawning aggregations. Several species once placed in Loligo are now assigned elsewhere following phylogenetic analyses; for instance, the longfin inshore squid (Loligo pealeii Lesueur, 1821, now Doryteuthis pealeii) of the western North Atlantic is sometimes retained in broader Loligo concepts in regional studies, though molecular data confirm its separation into Doryteuthis. Similarly, the market squid (formerly L. opalescens Berry, 1914, now Doryteuthis opalescens), notable for its bioluminescence and role in California fisheries with mantle lengths to 30 cm; the Patagonian squid (formerly L. gahi d'Orbigny, 1839, now Doryteuthis gahi); the slender inshore squid (formerly L. plei Blainville, 1823, now Doryteuthis plei); L. chinensis Gray, 1849 (now Uroteuthis chinensis); L. duvaucelii d'Orbigny, 1835–1844 (now Uroteuthis duvaucelii); and L. edulis Hoyle, 1885 (now Uroteuthis edulis) have been reclassified to reflect their distinct evolutionary lineages. The genus demonstrates persistence through geological time, with the extinct Loligo applegatei Clarke & Fitch, 1979, known from Eocene statoliths in North American deposits, representing one of the earliest fossil records of true squids.

Description

Anatomy

Loligo squids exhibit a classic decapodiform body plan characterized by an elongated, cylindrical mantle that forms the primary muscular tube housing the visceral organs and extending up to 40 cm in mantle length for adults in species such as L. vulgaris. L. forbesii can reach up to 94 cm mantle length (males), while L. reynaudii attains up to 40 cm (males). The mantle tapers posteriorly and is covered by a leathery cuticle, enclosing an internal chitinous gladius or pen for structural support. At the anterior end, the head bears eight shorter arms arranged in pairs around the mouth, each equipped with two rows of sessile suckers for manipulation, and two longer, retractable tentacles specialized for prey capture, featuring stalked suckers concentrated on club-shaped tips. Posteriorly, the fins form a rhomboid or triangular shape spanning much of the mantle length, enabling undulatory propulsion alongside jetting for agile swimming. Internally, the —a ventral extension of the mantle cavity—facilitates by expelling water forcefully through muscular contractions, allowing rapid escape responses. The includes a systemic heart that pumps oxygenated blood to the body and two branchial hearts that drive deoxygenated blood through the gills for oxygenation, supporting the high metabolic demands of active predation. An positioned near the siphon base stores melanin-rich fluid for defensive release, creating visual and chemical distractions. In females, paired nidamental glands produce gelatinous coatings for masses, while accessory nidamental glands harbor that may protect developing embryos. The eyes are large and prominent, with diameters reaching up to 2 cm in adults, featuring camera-like structures with spherical lenses and circular pupils adapted for low-light vision in coastal waters. Adult Loligo typically measure 20-90 cm in mantle length, though this varies by species and region; for instance, L. vulgaris commonly attains 15-25 cm, with maximums around 40 cm, L. forbesii up to 94 cm, and L. reynaudii up to 40 cm. occurs in several species, with males often larger than females at maturity, as observed in L. vulgaris where males exceed females in dorsal mantle length. The skin of Loligo is embedded with expandable chromatophores—pigment cells controlled by radial muscles—that enable rapid color changes for against varied backgrounds.

Synapomorphies

The genus Loligo is characterized by several shared derived traits that distinguish it within the family , reflecting adaptations to neritic environments. A key synapomorphy is the absence of photophores, unlike certain luminous squids in other teuthid families or even some loliginid genera such as Uroteuthis, which possess ventral light organs for . This lack of photophores aligns with the diurnal and shallow-water habits of Loligo species, reducing the need for . The tentacular clubs exhibit a distinctive structure with four longitudinal rows of suckers, bordered by aboral and oral keels that enhance prey capture efficiency during rapid strikes. These keels, often membranous and spanning much of the club length, provide stability and prevent slippage on agile prey, a configuration optimized for the predatory lifestyle of loliginid squids. Fins in Loligo are rhomboidal in shape and extend along nearly the full length of , typically comprising 50–75% of mantle length depending on the , enabling precise maneuvering and sustained in coastal currents. This elongated fin form contrasts with shorter fins in some distantly related oegopsid squids and supports burst for hunting and evasion. Males possess a locked on the left ventral arm, modified with rows of papillae that facilitate secure transfer during mating, a trait emblematic of loliginids and absent in oegopsid lineages. This specialization ensures efficient in dynamic aquatic pairings. As myopsid squids, Loligo species share statolith morphology typical of the lineage, with robust, saccular shapes used for balance and age determination, complemented by eyes covered by a transparent corneal that protects against abrasion in shallow, particulate-rich waters—unlike the exposed eyes of oegopsids.

Distribution and Habitat

Geographic Range

The genus Loligo is distributed in temperate and subtropical waters of the Atlantic , with its three accepted exhibiting distinct regional ranges but a general absence from polar regions. In the Eastern Atlantic, Loligo vulgaris occupies coastal and shelf waters from the and southward to the and as far as southwest , including the . Similarly, ranges from the and UK waters to the , , and , with extensions into the western via the . In the Southeastern Atlantic, Loligo reynaudii is found in subtropical waters off southern , from southern to the southeast coast of . These distributions highlight the genus's affinity for mid-latitude neritic environments, avoiding high-latitude polar seas such as the and Antarctic where no Loligo are recorded. Loligo species exhibit migratory patterns tied to spawning seasons, with individuals moving between deeper offshore waters in winter and shallower coastal areas in summer. For instance, Loligo forbesii migrates to shallower shelf depths during summer spawning off the UK and Iberian Peninsula. Fisheries data indicate historical range expansions for Loligo species through the 2010s, potentially driven by ocean warming; notable examples include increased abundance and southward expansions of Loligo spp. in the North Sea since the 1980s, linked to temperature rises. These shifts underscore the genus's responsiveness to environmental variability while maintaining core temperate-subtropical boundaries in the Atlantic.

Environmental Preferences

Species of the genus Loligo primarily inhabit the of continental shelves, typically at depths ranging from 10 to 500 meters, with many individuals found over sandy or muddy bottoms that provide suitable substrates for various life stages. These squids exhibit a benthopelagic , spending much of their non-reproductive period in the as pelagic swimmers while descending to benthic areas for egg deposition on firm substrates such as , , or rocky outcrops. Loligo species thrive in water temperatures between 8°C and 25°C, with optimal conditions for growth and survival generally falling within 12°C to 20°C for most taxa, influencing their seasonal migrations and abundance patterns. They are fully marine organisms adapted to salinities of 30 to 35 ppt, showing limited tolerance for lower values and generally avoiding estuarine extremes below 27 ppt to prevent osmotic stress. This preference for stable, oceanic conditions underscores their role as key components of shelf ecosystems, where temperature and salinity gradients help define their ecological niches.

Biology

Diet and Feeding

Loligo species are strictly carnivorous, preying primarily on small fish such as members of the family (e.g., and anchovies), crustaceans including and crabs, and occasionally other cephalopods. Fishes dominate the diet, occurring in over 80% of non-empty stomachs for species like L. forbesii and L. vulgaris, with crustaceans and cephalopods comprising secondary components that vary by region and season. For instance, in the northeast Atlantic, and Ammodytidae fishes are common prey for L. forbesii, while L. vulgaris shows similar patterns but with reduced reliance on crustaceans. For L. reynaudii off , the diet includes fishes, crustaceans, cephalopods, and polychaetes, with fishes often predominant. Feeding occurs through a specialized mechanism involving rapid extension of the tentacles to capture prey, followed by manipulation and tearing with the chitinous . This process leverages the squid's anatomical adaptations, such as the suckered tentacles and powerful radula-assisted , to subdue and consume live prey efficiently. Daily intake typically ranges from 7-20% of body weight, depending on and conditions; for example, L. forbesii averages around 14%. is rapid, often completing in 4-6 hours, allowing multiple feeding bouts daily. Ontogenetic shifts in diet are pronounced across Loligo , with juveniles targeting smaller planktonic prey and adults shifting to larger, more mobile items. Early stages, including paralarvae and small juveniles, feed predominantly on copepods and euphausiids to support rapid growth. As squid mature, consumption of and other squid increases, with crustacean intake declining; for L. forbesii, the importance of cephalopods increases with growth, while remain dominant. For L. reynaudii, juveniles (69–125 mm dorsal mantle length) feed mainly on euphausiids. This transition reflects increasing predatory capability and aligns with habitat changes from near-bottom to pelagic zones. Foraging in Loligo involves opportunistic predation, often conducted in schools to enhance prey detection and capture success. Individuals employ burst swimming to pursue or intercept prey, with strategies combining group coordination for schooling and solitary strikes on crustaceans. This behavior exploits local prey abundance, resulting in diets that mirror available resources rather than strict specialization.

Locomotion and Behavior

Loligo species employ a dual propulsion system for locomotion, combining jet propulsion for rapid bursts and fin undulation for sustained movement. Jet propulsion occurs through contraction of the mantle musculature, which expels water forcefully via the siphon, enabling escape responses and high-speed maneuvers. This mechanism allows individuals to achieve burst speeds of up to 25 body lengths per second, particularly in juveniles and smaller specimens, facilitating quick evasion from predators. For longer-distance travel and steady cruising, Loligo relies on undulatory waves propagated along the triangular fins, which generate lift and with minimal expenditure. This fin-based supports sustained speeds of approximately 0.5-1 m/s, depending on body size and environmental conditions, and is predominant at lower velocities where would be inefficient. In terms of behavior, Loligo exhibits schooling in loose aggregations typically comprising 10-100 individuals, which enhances predator avoidance through the confusion effect and improves foraging efficiency by coordinating movements to locate prey patches. These schools often form in open water habitats, where visual cues and hydrodynamic signals maintain cohesion. Sensory capabilities play a key role in these behaviors; while lacking a true lateral line organ like fish, Loligo detects water vibrations and low-frequency particle motions via statocysts and epidermal sensory hair cells, aiding in navigation and threat detection during group activities. Activity peaks nocturnally, with heightened swimming and sensory responsiveness at dusk and night to exploit dim-light conditions for reduced predation risk, though this varies with depth and local currents in their preferred neritic environments. For L. vulgaris, daytime activity is reduced, with squid remaining in small areas likely for spawning, while nighttime involves greater mobility possibly for feeding.

Reproduction

Mating Systems

Loligo species exhibit polygamous mating systems, where both males and females mate with multiple partners, often sequentially within short periods. For instance, in L. reynaudii, females may copulate with multiple males in spawning aggregations, facilitating multiple paternities in egg clutches. This is supported by alternative reproductive tactics among males, with larger "consort" males competing aggressively for access to females and smaller "sneaker" males employing stealthy approaches to achieve matings. Sperm transfer occurs via specialized spermatophores delivered using the , a modified arm in males that serves as the primary . Consort males typically adopt a "male-parallel" posture, positioning alongside the female to insert spermatophores directly into the mantle cavity near the . In contrast, sneaker males use a "head-to-head" posture to deposit spermatophores near the female's buccal mass seminal receptacle. displays are subtle compared to other cephalopods, involving rapid chases and dynamic color changes mediated by chromatophores to signal intent or status, particularly during male-female pairings near spawning grounds. Behavioral is pronounced during reproductive periods, with males generally larger than females and exhibiting heightened aggression in consort roles. Large males engage in agonistic interactions, such as beating and chasing intruders, to defend access to females, with larger individuals winning the majority of contests (14 out of 25 observed in L. reynaudii). Sneaker males, often smaller, avoid direct confrontation and opportunistically mate when consorts are distracted. Spawning seasonality varies by and ; in temperate regions, such as the English Channel for L. vulgaris, it occurs from November to April with peaks in February-March.

Egg Laying and Development

Females of the Loligo deposit eggs in elongated, gelatinous capsules arranged in strands or clusters, with each capsule typically containing 100 to 200 eggs. These egg masses are anchored to hard substrates such as rocks, shells, or seagrasses on the ocean bottom in shallow coastal waters, often at depths of 10 to 50 meters. The incubation period for Loligo eggs varies with environmental temperature, generally lasting 2 to 5 weeks at 15 to 20°C, during which the embryos develop within the protective capsules. Hatching occurs synchronously within a mass, releasing planktonic paralarvae that are transparent, dorso-ventrally flattened juveniles adapted for a pelagic lifestyle. Paralarvae grow rapidly during their planktonic phase, which typically endures at least 3 months, fueled initially by reserves and then by capturing small planktonic prey. This stage ends with into juvenile , marked by fin development and a shift to a more demersal or near-bottom where they begin resembling miniature adults. Potential in Loligo females ranges from 10,000 to 20,000 eggs per reproductive season, achieved through multiple oviposition events where oocytes mature asynchronously. Many exhibit semelparity, with females investing heavily in and typically dying shortly after spawning.

Human Interactions

Commercial Consumption

Loligo species, particularly L. vulgaris and Doryteuthis opalescens (formerly Loligo opalescens), form a significant portion of the global loliginid squid catch, exceeding 500,000 metric tons annually as reported in recent FAO data for the family. For current Loligo species, L. vulgaris catches average around 10,000 metric tons annually in the Mediterranean (as of 2018), while L. reynaudii supports a South African yielding 3,000–5,000 metric tons yearly. These catches are primarily harvested from coastal waters through targeted and by-catch fisheries, with using specialized lures being a common method for direct capture, alongside and purse seining operations that often yield squid incidentally during finfish targeting. In culinary applications, Loligo squid is widely processed into calamari, typically prepared as fried rings or grilled steaks, and serves as bait in other commercial fisheries due to its attractiveness to predatory fish. Nutritionally, it offers a high protein content of 15-20 grams per 100 grams of edible portion, with low fat levels around 1-2%, making it a lean seafood option rich in essential amino acids. Economically, Loligo fisheries are vital in the Mediterranean region for local markets and exports, in the United States where California landings of D. opalescens alone generated $30 million in 2023, and in Asian markets that rely heavily on imports for processing and consumption. Sustainable management includes quotas such as the 22,900 metric tons allocated for longfin squid (Doryteuthis pealeii) in the US Northeast for 2025, divided into trimesters to prevent overexploitation.

Educational and Scientific Uses

_Loligo species, particularly Loligo vulgaris, are commonly used in biology education for cephalopod dissections due to their widespread availability and well-defined anatomical structures. These dissections allow students to explore external features such as the mantle, fins, and tentacles, as well as internal organs including the digestive system, gills, and reproductive structures, providing hands-on learning about invertebrate anatomy. In neuroscientific research, the giant axons of Doryteuthis pealeii (formerly Loligo pealeii) have been instrumental in elucidating nerve impulse mechanisms, notably through the foundational work of and in the 1950s. Their experiments on isolated squid axons demonstrated how voltage-gated sodium and potassium channels generate action potentials, leading to the development of the Hodgkin-Huxley model that mathematically describes membrane excitability. This model, derived from voltage-clamp recordings on Loligo axons, remains a cornerstone for understanding neuronal signaling across species. Aquaculture trials for Loligo species, such as Doryteuthis opalescens (formerly Loligo opalescens), focus on rearing to support sustainable supply by reducing reliance on wild stocks. These efforts involve closed recirculating systems where hatchlings are fed live prey like Artemia nauplii and mysids, achieving survival rates of 36-60% over 45-60 days under optimized conditions including low water currents and frequent feeding. Such programs aim to close the life cycle for commercial species, though challenges like high early mortality persist. Genetic studies on in Loligo examine within the light organs, using 16S rRNA sequencing to identify strains like species from ink sacs and eyes of Uroteuthis duvaucelii (formerly Loligo duvaucelii) and . These investigations reveal phylogenetic relationships and genomic variations in bacterial isolates, contributing to understanding host-symbiont interactions for light production. has further characterized both bioluminescent and non-bioluminescent strains, highlighting potential evolutionary adaptations. Historically, early 20th-century research at the Stazione Zoologica Anton Dohrn utilized Loligo eyes to investigate visual adaptation and pigment migration. Pioneering experiments from the to explored screening pigments and their role in sensitivity, laying groundwork for comparative studies on vision systems. These studies emphasized the camera-like of eyes, influencing later of photoreception.

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