Palaeocoma
Extinct genus of brittle stars
From Wikipedia, the free encyclopedia
Palaeocoma is an extinct genus of brittle stars that lived during the Middle Triassic to Early Jurassic Periods. Its fossils have been found in Europe.[2]
| Palaeocoma | |
|---|---|
| |
| Palaeocoma milleri, Lower Jurassic (Pliensbachian) England. | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Ophiuroidea |
| Order: | Ophiurida |
| Family: | incertae sedis |
| Genus: | †Palaeocoma d'Orbigny, 1850[1] |
| Species | |
| |
Distribution
The genus Palaeocoma was revised by Hess (1960, 1962)[3][4] and is known from the Middle Triassic (Ladinian) to the Lower Jurassic (Toarcian) with occurrences reported from the United Kingdom,[5][6] France,[7][8] Luxembourg,[9] Germany,[10] Switzerland,[3][4] Italy,[11] and Serbia and Montenegro.[12]
Type species
Palaeocoma milleri (Phillips, 1829)[13] [= P. gaveyi and P. egertoni according to Jaselli (2015, p. 192)], an Early Jurassic (Sinemurian and Pliensbachian) species recorded from France, Germany, Luxembourg, the United Kingdom and Lombardy in Italy.[14]
Synonymised names
- Ophioderma carinata Wright, 1866[15]
- Ophioderma egertoni (Broderip, 1840)[16]
- Ophioderma gaveyi Wright, 1854[17]
- Ophioderma milleri (Phillips, 1829)
- Ophiura egertoni Broderip, 1840
- Ophiura milleri Phillips, 1829
- Ophiurella milleri (Phillips, 1829)
- Palaeocoma egertoni (Broderip, 1840)
- Palaeocoma gaveyi (Wright, 1854)
Other species
- Palaeocoma escheri Herr, 1865[18] [= Ophiura ventrocarinata Quenstedt 1876][19] was redescribed by Hess (1960) and recorded from the Lower Lias Staffelegg Formation,[20] of Schambelen near Mülligen in the Canton of Aargau of northern Switzerland. It occurs in the Hettangian, the earliest age and lowest stage of the Jurassic period and, specifically, the Psiloceras planorbis Ammonite Zone.
- Palaeocoma raiblana (Toula, 1887).[21] This species has so far only been found in the Triassic Wengener Schichten Formation (Ladinian) of Budva in Serbia and Montenegro).
Gallery
Palaeocoma milleri from the famous 'Starfish Bed' at Eype, UK. Coin diameter = 23.4mm.
Palaeocoma milleri
