Edited by oilshale
Report Fossil
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By oilshale (edited)
Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: Guildayichthyiformes Lund 2000
Family: Guildayichthyidae Lund 2000
Genus: Discoserra
Species: Discoserra pectinodon
Author Citation LUND, 2000
Eon: Phanerozoic
Era: Paleozoic
Period: Carboniferous
Sub Period: Mississippian
Epoch: Early
International Age: Serpukhovian
Big Snowy Group
Heath Formation
Acquired by: Purchase/Trade
Length: 8 cm
Bear Gulch
Fergus County
Montana
United States
Taxonomy from Lund 2000.
Diagnosis for the genus Discoserra from Lund 2000, p. 180: "Teeth of the premaxilla, maxilla and dentary long, thin, and styliform. Posterior end of maxilla does not extend back to level of anterior margin of orbit. Parietals excluded from contact in dorsal midline by postrostral 2, which contacts supraoccipital. No transverse supratemporal commissure in supraoccipital. Two rows of paired bones over orbit. One to three interopercular bones; two to three small postspiraculars and a presupracleithrum. Branchiostegals very variable in size, number and shape. Dorsal ridge scales with small, forwardly facing hooks; two to three small anal fin hooks. Origin of anterior edge of dorsal fin set well below dorsal margin of ridge scales. All fins with well spaced rays; pelvic fin reduced, caudal fin rounded."
Line drawing from Lund 2000, p. 183:
Identified by oilshale using Lund 2000.
References:
R. Lund (2000) The new Actinopterygian order Guildayichthyiformes from the Lower Carboniferous of Montana (USA). Geodiversitas 22(2):171-206
Edited by oilshale
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