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Ogygiocarella
Ogygiocarella Harrington and Leanza, 1957, is a genus of asaphid trilobites that lived during the Middle Ordovician Period.
The generic name, Ogygiocarella, refers to "Ogygia", the seventh daughter of Amphion and Niobe, which name is combined with "-care-", from the Greek "akares", meaning short, and finally "-ella", the diminutive form.[citation needed]
The first written record of a trilobite was by Edward Lhuyd (then-curator of the Ashmolean Museum, Oxford) in a letter written (1698) to Dr. Martin Lister and published (1699) in his Lithophylacii Britannici Ichnographia. The letter was accompanied by a page of etchings of fossils, one of which was found by him near Llandeilo, probably on the grounds of Lord Dynefor's Castle. One etching (the 15th) figured a fossil described as the "… Sceleton [sic] of some Flat-Fish …" . and is sufficiently detailed to be now identified as the trilobite Ogygiocarella debuchii.
Asaphus debuchii Brongniart (1822, pp. 20, 143, pl. ii, fig. 2A).
Whittard (1964, pp. 255-6) wrote: "Harrington and Leanza (1957, pp. 160-1) state that Asaphus debuchianus is the type species which was described and figured by Brongniart (1822); the specific name in this form was not used by Brongniart in the 1822 publication, but he used A. debuchii instead". The somewhat confused nomenclatorial history regarding the type species of Ogygiocarella was further discussed and clarified by Whittard (op. cit.).
The genus Ogygiocarella presently appears to be confined to Wales and Shropshire, England, first occurring in the Lower Llandeilian Stage as developed at Llandeilo in Wales and disappearing in the lowest Caradoc Series graptolite zone of Nemagraptus gracilis in Shropshire (Whittard, 1964, PP. 256-7).
Only two almost identical species of Ogygiocarella are currently recognized, namely O. debuchii and O, angustissima and differentiation of the two relies on the presence and preservation of their pygidia.
O. debuchii (Brongniart) is the most common trilobite species to occur within the Ordovician Shelve inlier, Shropshire, appearing in the middle part of the Meadowtown Formation (Llanvirn Series/Llandeilian Stage – Glyptograptus teretiusculus Zone) and persisting into the overlying Rorrington Shale Formation (Nemagraptus gracilis Zone) where it is much less abundant. The species is characterised by eleven pairs of pygidial pleural ribs, although a twelfth vestigial pair is sometimes evident.
Ogygiocarella
Ogygiocarella Harrington and Leanza, 1957, is a genus of asaphid trilobites that lived during the Middle Ordovician Period.
The generic name, Ogygiocarella, refers to "Ogygia", the seventh daughter of Amphion and Niobe, which name is combined with "-care-", from the Greek "akares", meaning short, and finally "-ella", the diminutive form.[citation needed]
The first written record of a trilobite was by Edward Lhuyd (then-curator of the Ashmolean Museum, Oxford) in a letter written (1698) to Dr. Martin Lister and published (1699) in his Lithophylacii Britannici Ichnographia. The letter was accompanied by a page of etchings of fossils, one of which was found by him near Llandeilo, probably on the grounds of Lord Dynefor's Castle. One etching (the 15th) figured a fossil described as the "… Sceleton [sic] of some Flat-Fish …" . and is sufficiently detailed to be now identified as the trilobite Ogygiocarella debuchii.
Asaphus debuchii Brongniart (1822, pp. 20, 143, pl. ii, fig. 2A).
Whittard (1964, pp. 255-6) wrote: "Harrington and Leanza (1957, pp. 160-1) state that Asaphus debuchianus is the type species which was described and figured by Brongniart (1822); the specific name in this form was not used by Brongniart in the 1822 publication, but he used A. debuchii instead". The somewhat confused nomenclatorial history regarding the type species of Ogygiocarella was further discussed and clarified by Whittard (op. cit.).
The genus Ogygiocarella presently appears to be confined to Wales and Shropshire, England, first occurring in the Lower Llandeilian Stage as developed at Llandeilo in Wales and disappearing in the lowest Caradoc Series graptolite zone of Nemagraptus gracilis in Shropshire (Whittard, 1964, PP. 256-7).
Only two almost identical species of Ogygiocarella are currently recognized, namely O. debuchii and O, angustissima and differentiation of the two relies on the presence and preservation of their pygidia.
O. debuchii (Brongniart) is the most common trilobite species to occur within the Ordovician Shelve inlier, Shropshire, appearing in the middle part of the Meadowtown Formation (Llanvirn Series/Llandeilian Stage – Glyptograptus teretiusculus Zone) and persisting into the overlying Rorrington Shale Formation (Nemagraptus gracilis Zone) where it is much less abundant. The species is characterised by eleven pairs of pygidial pleural ribs, although a twelfth vestigial pair is sometimes evident.
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