Pythonichthys colei ( Müller, 1999 ),

Ebersole, Jun A., Cicimurri, David J. & Stringer, Gary L., 2019, Taxonomy and biostratigraphy of the elasmobranchs and bony fishes (Chondrichthyes and Osteichthyes) of the lower-to-middle Eocene (Ypresian to Bartonian) Claiborne Group in Alabama, USA, inclu, European Journal of Taxonomy 585, pp. 1-274: 187-189

publication ID

https://doi.org/10.5852/ejt.2019.585

publication LSID

lsid:zoobank.org:pub:181B6FBA-ED75-4BB4-84C4-FB512B794749

DOI

http://doi.org/10.5281/zenodo.3664390

persistent identifier

http://treatment.plazi.org/id/18174D41-FF3F-FF13-FD8C-9CFC4CC80EC8

treatment provided by

Plazi

scientific name

Pythonichthys colei ( Müller, 1999 )
status

 

Pythonichthys colei ( Müller, 1999) 

Fig. 69View Fig C–D

Eosolea texana Dante & Frizzell in Frizzell & Dante, 1965: 716  , pl. 88, figs 15, 20.

Pythonichthys  sp. – Breard & Stringer 1995: 80.

“genus aff. Panturichthys  colei – Müller 1999: 68  , pl. 20, figs 4–5.

“genus Heterenchelyidarum ” colei – Nolf & Stringer 2003: 5  , pl. 1, figs 3–8.

Material examined

UNITED STATES OF AMERICA – Alabama • 2 otoliths GLS otolith comparative collection (1 specimen), WSU CC 474.4View Materials  .

Description

Species characterized by small otoliths of 2–3 mm length, height slightly less than length (height/length ratios approximately 85–90%). Shape almost circular to slightly oval. Margins tend to be smooth. Angle along posterodorsal margin. Ventral rim regularly curved. Inner face mainly smooth, convex, with no depressed area or ventral furrow. Sulcus obvious, not deeply impressed. No clear division of ostial and caudal portions of sulcus. Sulcus primarily located medially, extends across approximately 75% of inner face. Ventral margin of sulcus may undulate, especially in posterior portion. Posterior end of sulcus mainly rounded, tapers slightly. No crista superior or crista inferior. Outer face slightly concave, mainly featureless.

Remarks

Pythonichthys colei  is quite rare in the Claiborne Group formations, with only two specimens being recovered from the Lisbon Formation. This rare occurrence is not unusual, as Müller (1999) reported only 11 specimens of this species from the approximately 12 000 otoliths from the Tertiary of the US Atlantic Coastal Plain. Although Nolf & Stringer (2003) reported 90 specimens of P. colei  (as “genus Heterenchelyidarum ” colei  ) from 5 559 otoliths from the late Eocene Yazoo Clay, the taxon still represented less than 2% of the total assemblage. One unusual occurrence of this species is in the Clayton Formation (Paleocene) of central Arkansas, where it represents approximately 24% of the total specimens ( Stringer & Sloan 2018). This abundance is highly atypical, as, like its fossil counterparts, modern representatives of this family are rare and not well studied ( Smith et al. 2012).

Stratigraphic and geographic range in Alabama

This species was recovered only from the “upper” Lisbon Formation at site ACh-8. Bartonian, zones NP16 and NP17.

WSU

Weber State University, Bird and Mammal Collection

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Anguilliformes

Family

Heterenchelyidae

Genus

Pythonichthys

Loc

Pythonichthys colei ( Müller, 1999 )

Ebersole, Jun A., Cicimurri, David J. & Stringer, Gary L. 2019
2019
Loc

Eosolea texana Dante & Frizzell in Frizzell & Dante, 1965: 716

Frizzell D. L. & Dante J. H. 1965: 716
Loc

Pythonichthys

Breard S. & Stringer G. 1995: 80