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Myomorpha
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Myomorpha
Temporal range: 47.8–0 Ma Ypresian - Recent
Eastern spiny mouse (Acomys dimidiatus)
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Suborder: Myomorpha
Brandt, 1855
Superfamilies

Muroidea
Dipodoidea

Synonyms

Murimorpha

The suborder Myomorpha contains 1,524 species of mouse-like rodents,[1] nearly a quarter of all mammal species. Included are mice, rats, gerbils, hamsters, lemmings, and voles. They are grouped according to the structure of their jaws and molar teeth. They are characterized by their myomorphous zygomasseteric system, which means that both their medial and lateral masseter muscles are displaced forward, making them adept at gnawing. As in the hystricognathous rodents, the medial masseter muscle goes through the eye socket, a feature unique among mammals. Myomorphs are found worldwide (apart from Antarctica) in almost all land habitats. They are usually nocturnal seed-eaters.

Most myomorph species belong to the superfamily Muroidea: (hamsters, voles, lemmings, true mice, true rats, and gerbils).

Historically, the definition of the suborder Myomorpha has included one or both of:

References

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Further reading

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Grokipedia

Myomorpha

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Myomorpha is a suborder of rodents within the order Rodentia, distinguished by its myomorphous zygomasseteric architecture, in which the deep masseter muscle extends onto the rostrum beneath the zygomatic arch while the zygomatico-mandibularis portion passes through a moderately enlarged infraorbital foramen to enhance gnawing efficiency.[1] This suborder, first formally recognized by Johann Friedrich von Brandt in 1855 based on cranial morphology, encompasses about 1,600 species—representing nearly a quarter (about 25%) of all mammal species as of 2025—and is the most diverse and widespread group of rodents, excluding Antarctica, New Zealand, and certain oceanic islands.[2][3] Key families include Dipodidae (jumping mice and jerboas) in the superfamily Dipodoidea, and in the superfamily Muroidea, families such as Cricetidae (New World rats, mice, voles, hamsters, and lemmings) and Muridae (Old World rats, mice, and gerbils).[4][5] Myomorph rodents exhibit remarkable ecological and morphological diversity, ranging from small, adaptable species like the house mouse (Mus musculus) and brown rat (Rattus norvegicus) that thrive in urban environments to specialized forms such as bipedal jerboas adapted to arid deserts.[5] Their high reproductive rates, often with early maturity and multiple litters per year, contribute to their success, though most individuals have short lifespans under two years due to high predation and environmental pressures.[5] Typically featuring 16 teeth without premolars and rooted molars suited for gnawing plant material, seeds, and insects, these rodents play crucial roles in ecosystems as seed dispersers, prey for predators, and sometimes agricultural pests.[6] The evolutionary history of Myomorpha traces back to the early Eocene, with origins likely in Asia, and molecular and paleontological evidence supports its monophyly as the Myodonta clade, closely related to but distinct from other rodent suborders like Sciuromorpha and Hystricomorpha.[7] This suborder's adaptive radiation has led to varied behaviors, including burrowing, jumping, and lodge-building in some species, underscoring their global influence on biodiversity and human activities.[8]

Taxonomy

Etymology and nomenclature

The name Myomorpha is derived from the Greek words mys (μῦς), meaning "mouse," and morphē (μορφή), meaning "form" or "shape," referring to the mouse-like morphology of the rodents within this suborder.[6][9] The term was coined by the German-Russian naturalist Johann Friedrich von Brandt in 1855 to designate a group of rodents characterized by their sciurognathous jaw structure and the positioning of the masseter muscles, distinguishing them from other rodent forms like the squirrel-like Sciuromorpha. Brandt introduced Myomorpha in his seminal work Beiträge zur nähern Kenntniss der Säugethiere Russlands, where he classified rodents into suborders based primarily on zygomatic and masticatory anatomy, placing mouse-like species in this category. In older literature, particularly from Eastern European and some early 20th-century taxonomic works, the synonym Murimorpha was occasionally used interchangeably with Myomorpha, reflecting variations in transliteration or emphasis on the Muridae family as a core group.[10] However, Myomorpha has been the standard name since Brandt's original publication and is now firmly established under the International Code of Zoological Nomenclature (ICZN), which governs the priority and stability of zoological names, ensuring its validity as the accepted subordinal designation within Rodentia. As of July 2025, the suborder Myomorpha encompasses over 1,600 valid species, representing a significant portion of rodent diversity and underscoring the taxonomic stability of Brandt's nomenclature in contemporary classifications.[11]

Classification and phylogeny

Myomorpha is classified as a suborder within the order Rodentia, which belongs to the class Mammalia, phylum Chordata, and kingdom Animalia.[7] Modern classifications recognize Rodentia as comprising at least five suborders, including Sciuromorpha, Myomorpha, Hystricomorpha, Anomaluromorpha, and Castorimorpha.[12] This suborder encompasses approximately two-thirds of all rodent species, highlighting its significant diversity within the order.[2] The suborder includes two primary superfamilies: Muroidea and Dipodoidea. Muroidea comprises families such as Muridae (true mice and rats), Cricetidae (hamsters, voles, and lemmings), and Nesomyidae (African pouched rats and climbing mice). Dipodoidea includes the family Dipodidae (jerboas and jumping mice).[13][14] Phylogenetic analyses based on molecular and morphological data from studies after 2000 confirm Myomorpha as a monophyletic group within Rodentia, forming part of the Myodonta clade alongside Anomaluromorpha.[1] The Myodonta clade is positioned as sister to Hystricomorpha (porcupine-like rodents), with Sciuromorpha diverging earlier in the evolutionary history.[15] Key cladistic studies, including those using nuclear genes and mitogenomic data, support the monophyly of Myomorpha, with its crown age estimated around 40–50 million years ago during the late Eocene.[1][16]

Morphology

External appearance

Myomorph rodents exhibit a characteristic mouse-like body plan, featuring an elongated snout, small rounded ears, and a long tail that often exceeds the head-body length, aiding in balance and sensory functions. This compact, cylindrical form is adapted for agility in diverse environments, with the tail typically scaly and covered in fine hairs, varying from nearly hairless in some species to bushy in others.[17][6] Size varies dramatically across the suborder, from tiny pygmy mice such as Mus minutoides with head-body lengths under 5 cm and weights around 5-12 g, to larger species like the brown rat (Rattus norvegicus) reaching up to 28 cm in head-body length and over 200 g.[6][18][19] This range reflects adaptations to ecological niches, with smaller forms emphasizing rapid reproduction and larger ones supporting greater fat storage. Fur in myomorphs is typically soft and dense, providing insulation and camouflage, as seen in the fine, woolly pelage of many murids; however, variations include spiny or bristly coats in species like the eastern spiny mouse (Acomys dimidiatus), where enlarged awl hairs form stiff spines on the back and flanks for defense. Pelage color often grades from darker dorsal tones to lighter ventral areas, though specifics are not habitat-linked here.[17][20] Limb adaptations enhance agility, with cursorial hindlimbs in ground-dwelling species supporting swift running, while elongated hindlimbs in jerboas (Dipodidae) enable saltatorial jumping, often with reduced forelimbs for bipedal locomotion. The myomorphic zygomasseteric system contributes to a prominent jaw outline visible externally.[21][17]

Skull and jaw structure

The myomorphous zygomasseteric system defines the cranial anatomy of Myomorpha, featuring anterior displacement of the masseter muscles that enhances gnawing efficiency. In this system, the medial masseter muscle, particularly its infraorbital portion (zygomatiomandibularis anterior), passes through an enlarged infraorbital foramen into the orbit, while the lateral masseter (superficial masseter) extends forward onto the rostrum. This configuration allows the deep masseter to attach anterior and dorsal to the infraorbital foramen, forming a prominent zygomatic plate on the anterolateral surface of the maxilla.[22][23] Myomorph skulls exhibit an elongated rostrum and relatively wide zygomatic arches, adaptations that accommodate the expanded masseter origins and provide leverage for jaw adduction. The infraorbital foramen is notably large compared to other rodent suborders, facilitating the passage of muscle fibers without compromising the structural integrity of the orbit. The lower jaw is slender, with a reduced angular process and a prominent masseteric ridge, supporting rapid mandibular protraction and retraction during feeding.[24][22] Compared to sciuromorph rodents, where the masseter originates primarily on the zygomatic arch with the deep portion extending onto the rostrum but not through the foramen, the myomorphous condition integrates a hybrid arrangement: it shares the anterior masseter extension with sciuromorphs but incorporates the intraorbital medial masseter pathway typical of hystricomorphs, where the deep masseter remains ventral to the zygoma and the system emphasizes lateral expansion over the arch. This distinction is evident in geometric morphometric analyses, where myomorphous skulls cluster compactly in morphospace, overlapping partially with sciuromorphous and hystricomorphous forms along principal components capturing 30.5% and 21.3% of shape variation, respectively, but separated by the unique combination of rostral and orbital muscle attachments. Within Myomorpha, muroids (e.g., Muridae) display proportionally wider zygomatic arches relative to body size than dipodoids (e.g., Dipodidae), reflecting ecological divergences in feeding mechanics.[22][25] The jaw mechanics enabled by this system permit powerful incisor gnawing through coordinated masseter contraction, which protracts the mandible and generates high bite forces at the anterior dentition. The arrangement contributes to a degree of rostral mobility, allowing limited independent movement of the premaxillary and maxillary regions during occlusion, which facilitates precise manipulation of food items like seeds.[23][22]

Dental formula

The dental formula of adult Myomorpha is typically 2 × (I¹/₁, C⁰/₀, P⁰/₀, M³/₃) = 16, consisting of a single pair of upper and lower incisors per quadrant and three molars per quadrant, with no canines or premolars.[6] This arrangement supports their gnawing lifestyle, where the incisors are rootless (aradicular) and continuously grow throughout life to compensate for wear.[26] Myomorph incisors feature enamel concentrated on the anterior (labial) surface, which is harder than the underlying dentine on the posterior (lingual) surface, resulting in a self-sharpening mechanism during gnawing as the softer dentine wears faster.[6] This adaptation enables efficient cutting of tough materials like wood or seeds. Variations in cheek tooth (molar) morphology occur across Myomorpha superfamilies, reflecting dietary adaptations. In Dipodoidea, such as jerboas, molars tend to be simplified with lophodont patterns—high, transverse ridges—suited to abrasive, sandy diets that accelerate wear.[27] Conversely, Muroidea exhibit more complex cuspidate molars with additional mesial cusps, particularly on the first molar (M1), facilitating processing of varied vegetation through interlocking cusps during occlusion.[28] Within Muroidea, subfamilies like Arvicolinae (voles) often display hypsodont (high-crowned) molars that grow continuously, with prismatic enamel folds ideal for grinding fibrous plant matter.[29]

Distribution and habitat

Geographic range

Myomorpha, the suborder encompassing mouse-like rodents, are native to all continents except Antarctica and Australia, though several species have been introduced to Australia through human-mediated transport.[30][31] The suborder exhibits its highest species diversity in Eurasia and Africa, regions that serve as key centers of endemism and radiation for these rodents.[32] Within these areas, the superfamily Muroidea predominates in temperate zones across Eurasia and parts of Africa, while the superfamily Dipodoidea reaches peak diversity in the arid regions of Asia and extends into North America.[33][34] Several Myomorpha species have been widely introduced beyond their native ranges, with the house mouse (Mus musculus) and black rat (Rattus rattus) achieving cosmopolitan distributions that include oceanic islands and isolated landmasses previously devoid of these rodents.[30][35] Post-Pleistocene climatic shifts facilitated historical range expansions for various Myomorpha lineages, including gerbils (subfamily Gerbillinae), which dispersed from core Asian and African populations into the Middle East and North Africa during periods of environmental suitability.[36][37]

Habitat preferences

Myomorph rodents exhibit remarkable versatility in habitat preferences, occupying a wide array of biomes including forests, grasslands, deserts, and urban environments. Many species, such as voles in the family Cricetidae, favor burrowing lifestyles in grassy or forested areas, constructing extensive underground tunnels for protection and foraging.[38] In contrast, some mice like the wood mouse (Apodemus sylvaticus) in the Muridae family display semi-arboreal behaviors, utilizing woodland canopies and hedgerows alongside ground-level habitats.[39] Members of the superfamily Dipodoidea, particularly jerboas in the family Dipodidae, are highly adapted to arid environments such as sandy and hyper-arid deserts. These rodents, including hairy-footed jerboas (Dipus spp.), inhabit high-altitude arid regions and semi-deserts, where they exhibit nocturnal activity patterns to evade extreme daytime heat and conserve water through specialized physiological traits.[40] Species within the family Muridae, such as the Norway rat (Rattus norvegicus) and house mouse (Mus musculus), frequently thrive in urban and commensal settings, exploiting human-modified landscapes like farms, cities, and buildings for shelter and resources. These adaptations allow them to persist in densely populated areas worldwide, often in close association with human activity.[41] Myomorphs demonstrate a broad altitudinal range, from sea level to extreme high-elevation zones. For instance, voles like the California vole (Microtus californicus) occupy high-altitude meadows in mountainous regions, while Andean mice in the genus Phyllotis (Cricetidae) extend to elevations exceeding 6,700 meters in rocky, icy Andean summits above the vascular plant line.[42][43]

Ecology and behavior

Diet and foraging

Members of Myomorpha primarily maintain a herbivorous and granivorous diet, consuming seeds, nuts, grains, and various forms of vegetation such as leaves and stems. This feeding strategy supports their high metabolic rates and reproductive demands in diverse environments.[30] Many species exhibit omnivorous tendencies, particularly within the Muridae family, where rats opportunistically include insects, small invertebrates, and occasionally carrion in their diet to supplement nutritional needs. For instance, the African giant pouched rat (Cricetomys gambianus) incorporates ants and other insects alongside plant matter, reflecting rare myrmecophagous adaptations in the suborder.[44] Foraging occurs predominantly at night in most myomorphs to evade diurnal predators, enhancing survival in open or semi-open habitats. They rely heavily on olfaction for locating food sources from afar and vibrissae (whiskers) for close-range tactile detection and navigation in dim conditions.[30] Food hoarding behaviors are widespread, serving as a buffer against seasonal scarcity. Hamsters (Cricetinae) typically practice larder-hoarding, amassing large caches of seeds and grains in burrow chambers for later consumption. In contrast, gerbils (Gerbillinae) often employ scatter-hoarding, dispersing smaller piles across territories to reduce pilferage risks.[45][46] Specialized diets appear in certain lineages, such as folivory among some voles. The red tree vole (Arborimus longicaudus), for example, feeds almost exclusively on coniferous needles, particularly Douglas fir, which provides essential nutrients despite high fiber content. These adaptations are facilitated by dental structures like ever-growing incisors suited for gnawing fibrous materials.[47]

Reproduction and life cycle

Myomorph rodents typically exhibit polygamous mating systems, in which males mate with multiple females to maximize reproductive success, often influenced briefly by social hierarchies that affect mate access. Many species, particularly within families like Cricetidae (e.g., voles and hamsters), display induced ovulation, where copulation triggers the release of eggs approximately 10-15 hours post-mating, facilitating rapid fertilization and contributing to high reproductive output.[48][49][50] Gestation periods in Myomorpha range from 15 to 26 days across taxa, with house mice (Mus musculus) averaging 19-21 days and Syrian hamsters (Mesocricetus auratus) 15-18 days. Litter sizes are generally large to offset high mortality rates, commonly 4-12 young per litter in murids like mice and rats (Rattus norvegicus), and 3-7 in gerbils (Meriones unguiculatus). Young are born altricial—blind, hairless, and helpless—requiring intensive maternal care; for instance, meadow jumping mouse (Zapus hudsonius) offspring, numbering 2-9 per litter, remain dependent for several weeks despite their species' rapid overall development.[51][52][53] Sexual maturity is achieved quickly, often within 1-3 months, enabling multiple breeding cycles; mice reach puberty at 5-8 weeks, while gerbils do so at 2-3 months. This accelerated life history supports high fecundity, with females capable of producing several litters annually under optimal conditions. Lifespans vary markedly by environment and species: wild house mice typically survive 1-2 years due to predation and resource scarcity, whereas captives can reach 2-3 years; hamsters in captivity often exceed 3 years, with some living 4-5 years, contrasting shorter wild tenures of 1-2 years. Such elevated reproductive rates compensate for elevated mortality in natural settings.[51][54][55] Breeding patterns differ by latitude and habitat: temperate species, such as many North American voles and mice, show seasonal reproduction aligned with spring-summer resource peaks (e.g., increased photoperiod and rainfall), often ceasing in winter. In contrast, tropical Myomorpha, like certain Southeast Asian rats, breed continuously year-round, driven by stable food availability rather than pronounced seasonal cues.[56][30]

Social structure and communication

Myomorph rodents exhibit a range of social structures, from solitary living to complex colonial or family-group organizations, which vary by species and environmental pressures. Many species, such as house mice (Mus musculus) and Norway rats (Rattus norvegicus), display territorial behaviors where adult males maintain exclusive territories through aggressive interactions, often excluding intruders to secure resources and mates.[57] In contrast, species like prairie voles (Microtus ochrogaster) engage in communal nesting, where related individuals share burrows and cooperate in rearing offspring, facilitated by kin recognition mechanisms involving pheromones in urine and scent glands that allow discrimination between familiar kin and unrelated individuals.[58] This kin-biased sociality enhances inclusive fitness by promoting cooperative care among relatives.[59] Communication among myomorphs relies on multiple modalities to maintain social bonds, signal status, and coordinate group activities. Vocalizations are prominent, particularly ultrasonic calls in the 20–110 kHz range emitted by mice and rats during social interactions, such as courtship songs by males to attract females or distress calls by isolated pups to elicit maternal retrieval—though these serve communicative rather than echolocative purposes.[60] Alarm signals include both ultrasonic and audible squeaks in response to threats, alerting conspecifics to danger. Scent marking via urine, feces, or sebaceous glands is a key chemical channel; for instance, male house mice deposit marks to advertise dominance and territory boundaries, modulating social relationships and reducing aggression among group members.[61] Within groups, dominance hierarchies structure interactions, as seen in Mongolian gerbils (Meriones unguiculatus), where age-based ranks determine access to breeding opportunities, with dominant adults suppressing subordinates through agonistic displays and scent marking via ventral glands.[62] Cooperative behaviors, including alloparenting, are evident in prairie voles, where non-breeding subadults provide care such as huddling and grooming to siblings' offspring, influenced by prior alloparental experience that enhances future parental responsiveness.[63] Tactile communication through allogrooming reinforces bonds and hierarchy, releasing oxytocin to promote affiliation and reduce stress in rodents like mice. Visual signals, though less dominant due to nocturnal habits, include tail waving or flagging during leaps in jerboas (Dipodidae), which may convey alarm or territorial intent to distant group members.

Evolutionary history

Fossil record

The fossil record of Myomorpha extends back to the middle Eocene, with the earliest known representatives appearing in North America during the early Bridgerian North American Land Mammal Age, approximately 50.3–46.2 million years ago. Primitive myomorphs such as Elymys complexus from the Sheep Pass Formation in Ely, Nevada, exhibit early myomorphous jaw and masseter muscle adaptations, marking the suborder's divergence from sciuravid ancestors.[64] Similarly, Reithroparamys species, classified within the subfamily Reithroparamyinae of the Ischyromyidae, are documented from late middle Eocene deposits (approximately 42.7–39.2 million years ago) in the Clarno Formation at Hancock Mammal Quarry, Oregon, representing small-bodied, squirrel-like forms with incipient myomorph traits.[65] Eocene myomorph fossils also occur in Asia, with genera like Aksyiromys from middle Eocene sites in China and Central Asia indicating intercontinental dispersal from North America shortly after the suborder's origin.[64] In Europe, transitional forms from proto-rodent stock appear in late Eocene deposits, bridging paramyid-like ancestors to more derived myomorphs by the Oligocene.[1] The extinct family Eomyidae, spanning the late Eocene to late Miocene, played a pivotal role as early myomorphs, with diverse genera like Metanoiamys serving as stem taxa that linked primitive ischyromyids to modern superfamilies such as Muroidea and Dipodoidea; eomyids were small to medium-sized, superficially squirrel-like rodents that dominated some middle Cenozoic assemblages in North America, Europe, and Asia.[66] Their fossils, including those from Oligocene sites in the Valley of Lakes, Central Mongolia, highlight a peak in diversity during the Oligocene, reflecting adaptive radiations in forested to woodland environments.[67] Following the Oligocene, myomorph diversification accelerated in the Miocene, with families like Cricetidae originating in Eurasia and spreading globally. Post-Miocene radiations, particularly in the Pliocene and Quaternary, coincided with the expansion of grasslands and arid habitats driven by late Miocene global cooling, fostering the evolution of arid-adapted forms such as specialized burrowers and seed-eaters within Muroidea.[68] This temporal pattern underscores Myomorpha's adaptive success, from Eocene origins in humid forests to dominance in open, dry ecosystems.

Phylogenetic relationships

Myomorpha constitutes a monophyletic suborder within Rodentia, strongly supported by morphological synapomorphies such as the myomorphous zygomasseteric system, where the masseter muscle originates extensively from the zygomatic arch and inserts onto the rostrum, facilitating powerful gnawing. This structure distinguishes Myomorpha from the sciuromorphous and hystricomorphous conditions in other rodent suborders. Molecular evidence further corroborates monophyly, including analyses of the interphotoreceptor retinoid-binding protein (IRBP) gene sequences from 22 rodent species, which recover Myomorpha as a well-supported clade with bootstrap values exceeding 90%. Within the superorder Euarchontoglires, Myomorpha belongs to the rodent crown group, where the mouse-related clade (encompassing Myomorpha, Anomaluromorpha, and Castorimorpha) forms the sister group to Sciuromorpha, with their divergence estimated at approximately 60–50 million years ago (Ma) based on relaxed molecular clock phylogenies calibrated with fossil constraints. This split reflects an early Paleogene radiation following the K-Pg boundary, aligning with the emergence of modern rodent lineages amid post-extinction ecological opportunities.[69] Internally, Myomorpha comprises two superfamilies: Dipodoidea, which branches basally and includes specialized jumping forms like jerboas (Dipodidae), and the more diverse Muroidea, encompassing families such as Muridae, Cricetidae, and Nesomyidae. Phylogenetic analyses using multiple nuclear genes (e.g., GHR, BRCA1, RAG1, c-myc) resolve Dipodoidea as the sister taxon to Muroidea, with the latter undergoing rapid radiations during the Miocene (circa 25–10 Ma), driven by climatic shifts and habitat diversification that facilitated explosive speciation in Old World and New World lineages.[69] Classification of Myomorpha has involved controversies, particularly regarding the inclusion of Anomaluridae (scaly-tailed squirrels), which early schemes grouped within or near Myomorpha due to superficial similarities in dental and cranial features. However, comprehensive molecular phylogenies using nuclear and mitochondrial datasets now firmly place Anomaluridae within the distinct suborder Anomaluromorpha, as the sister group to core Myomorpha (Myodonta), resolving prior ambiguities and highlighting independent evolutionary trajectories in African rodent faunas.

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