Hulettia americana Eastman, 1899

By oilshale (edited)

• July 4, 2019

Taxonomy

Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: Palaeonisciformes Hay 1902
Family: Incertae sedis
Genus: Hulettia
Species: Hulettia americana
Author Citation Eastman 1899

Geological Time Scale

Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Late

Stratigraphy

Sundance Formation

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 14 cm

Location

Cowley
Big Horn County
Wyoming
United States

• cowley
• hulettia
• jurassic
• pholidophorus
• sundance formation
• tff-oilshale-ch394

Comments

Alternative combination: Pholidophorus americanus

Taxonomy from Fossilworks.org.

Diagnosis  "A generalized halecostome neopterygian with the following combination of primitive and derived characters: braincase with persistent otico-occipital fissure; no supraoccipital; intercalar without membranous outgrowths; parasphenoid broad, toothed, with foramina for efferent pseudobranchial and internal carotid arteries; vomer median; nasals separated by rostral. Nasal processes of premaxillae simple, meeting in midline and occasionally fusing; maxilla free and mobile, extending beneath posterior part of orbit, no supramaxilla. Quadratojugal independent and splintlike. Interopercular present. Post-temporal (suprascapular) with internal process. Large, median basihyal toothplate; no gular. Vertebral column with separate neural arches and dorsal intercalaries throughout; separate ventral intercalaries present only in anterior part of caudal region; unpaired neural spines in posterior half of column. Dorsal and ventral chordal hemicentra meeting as annular chordacentra in mature individuals. No ossified ural/neural arches. At least seven epurals. Hypocaudal skeleton with five elongated preural haemal spines and at least eight unmodified hypurals. No clavicle. Scales rhomboidal, composed of enameloid and bony base; dentine absent. Basal and fringing fulcra on all fins."

Line drawing from Schaeffer et al. 1984, p. 2796:

Identified by oilshale

References:

C. R. Eastman (1899) Jurassic fishes from Black Hills of South Dakota. Geological Society America Bulletin 10:397-408.

Schaeffer, B.. Patterson, C. (1984) Jurassic fishes from the western United States, with comments on Jurassic fish distribution. American Museum Novitates ; no. 2796, pp. 1-86, figs. 1-39, tables 1-4