Edited by oilshale
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Kalops diophrys Poplin & Lund, 2002
Images: 
By oilshale (edited)
Taxonomy
Palaeonisciformes
Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: incertae sedis
Family: incertae sedis
Genus: Kalops
Species: Kalops diophrys
Author Citation Poplin & Lund, 2002
Geological Time Scale
Eon: Phanerozoic
Era: Paleozoic
Period: Carboniferous
Sub Period: Mississippian
Epoch: Late
International Age: Serpukhovian
Stratigraphy
Big Snowy Group
Heath Formation
Provenance
Acquired by: Purchase/Trade
Dimensions
Length: 9 cm
Location
Bear Gulch
Fergus County
Montana
United States
Comments
Taxonomy from Fossilworks.org.Kalops diophrys is distinguished from its larger sister species, Kalops monophrys, by fewer caudal fin rays, a different number of supraorbital bone rows, and the development of its ganoine ridging at a smaller size. The cranial osteology most closely resembles that of the poorly known Palaeoniscus and "Elonichthys" serratus. The snout structure is closest to the Tarrasiiformes.Diagnosis from Poplin & Lund 2002, p. 1020: "Total length ranging from 50 to 96 mm; in the midline, postrostral meeting the frontal at mid-orbitalevel; two rows of supraorbitals; presence of a bone, probable spiracula lateral to the dermosphenotic; dermopterotic with a spur posterolateral to the anterior extrascapular row; six infraorbitals, and about 12 suborbital bones; anterior limb of the preopercle not as high as the maxillary posterior plate; presence of a small postspiracular behind the dermohyal; opercle tall, two and a half as high as long; ten to 12 branchiostegal rays; two rows of extrascapulars: anterior one with five paired and one median ossicles, posterior one with one paired bone carrying the supratemporal commissure; supracleithrum not as high as the opercle; scales of the lateral line hexagonal; three to six predorsal scutes, not reaching the skull; pectoral fin fan shaped; dorsal fin long based, spanning about 21 scale rows; anal fin without fulcra; scaled lobe of the caudal fin at 30 degrees to the body axis."Line drawing from Poplin & Lund 2002, p. 1022:
Identified by oilshale using Poplin & Lund 2002.
References:
Poplin, C., & R. Lund. 2002. "Two Carboniferous fine-eyed paleoniscoids (Pisces, Actinopterygii) from Bear Gulch (USA)." Journal of Paleontology 76: 1014-1028.
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