Todiltia schoewei (Dunkle, 1942)

By oilshale

• March 27, 2021

Taxonomy

Kingdom: Animalia
Phylum: Chordata
Class: Osteichthyes
Order: Leptolepiformes
Family: Leptolepidae
Genus: Todiltia
Species: Todiltia schoewei
Author Citation (Dunkle, 1942)

Geological Time Scale

Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Middle
International Age: Callovian

Stratigraphy

Todilto Formation

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 6 cm

Location

Bull Canyon
Guadalupe County
New Mexico
United States

• bull canyon
• callovian
• guadalupe county
• jurassic
• luciano mesa member
• new mexico
• tff-oilshale-ch2526
• todiltia
• todilto formation

Comments

Alternative combination: Leptolepis schoewei.

Taxonomy taken from NMNH Catalog Number USNM V 17903.
DIAGNOSIS after Schaeffer & Patterson (1984): "Middle Jurassic teleostean fishes of leptolepid grade, but differing from similar fishes in having only chordacentra until late in growth. The chordacentra receive perichordal additions only in the midcaudal region, and only in the largest specimens. About 50 vertebrae, 30 abdominal. Dorsal fin in the middle of the back with about 16 rays; anal originates beneath posterior edge of dorsal, with about 14 rays; pelvics beneath dorsal origin, with about 12 rays. No bone-enclosed rostral commissure or rostral pitline; supraorbital sensory canal not meeting infraorbital, and with three medial and two lateral branches above the rear of the orbit…."

Identified by oilshale according to Schaeffer and Patterson, 1984 on the basis of the leptolepid maxilla and praemaxilla, fins and fin position, weak scaling, and absent or weak chordacentra.

Line drawings from Schaeffer and Paterson 1984:

Reference:

Dunkle, D. H. (1942): A new fossil fish of the family Leptolepidae. Cleveland Mus. Nat. Hist., Sci. Publ., vol. 8, pp. 61-64.
Schaeffer, B. and Patterson, C. (1984): Jurassic fishes from the western United States, with comments on Jurassic fish distribution. American Museum Novitates 2796: 1-86.
Schultze, Hans-Peter and Encisco, Gonzalo (1983): MIDDLE JURASSIC AGE OF THE FISH-BEARING HORIZON IN THE CANYON CITY EMBAYMENT, COLORADO. Journal of Paleontology, V. 57, No. 5, p. 1053-1060.
Lucas, Spencer G. and Heckert, Andrew B. (2015): NEW MEXICO’S RECORD OF JURASSIC FOSSIL VERTEBRATES[DTB1] .  In Vertebrate Paleontology in New Mexico: Bulletin 68, p. 97-104.