Paraconger sector ( Koken, 1888 ),

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: 190-191

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.3664355

persistent identifier

http://treatment.plazi.org/id/18174D41-FF38-FF11-FD94-997E4FE30B3F

treatment provided by

Plazi

scientific name

Paraconger sector ( Koken, 1888 )
status

 

Paraconger sector ( Koken, 1888) 

Fig. 69View Fig I–J

Otolithus (Platessae) sector Koken, 1888: 292  , pl. 17, fig. 14.

Paraconger sector – Nolf 1985: 292  , pl. 17, fig. 14; 2003: 4, pl. 1, fig. 2a–b; 2013: 35–37, pl. 24. — Nolf & Stringer 2003: 7, pl. 2, figs 9a–10.

Paraconger americanus – Müller 1999: 70  , pl. 20, figs 11–17.

Material examined

UNITED STATES OF AMERICA – Alabama • 4 otoliths; GLS otolith comparative collection (3 specimens), MSC 39052View Materials  .

Description

Species characterized by massive otoliths; height approximately 75% of the length. Margins primarily smooth; anterior margin is rounded. Ostial rim slightly concave, posterodorsal rim displays only very slight concavity. Posterior noticeably tapered, often almost bluntly pointed. Anteroventral rim rounder, shorter than posteroventral rim; posteroventral rim straighter and longer. Very slight angularity along ventral rim, near center. Inner face mainly smooth, convex. Sulcus fairly wide, only slightly incised. Sulcus filled with colliculum; ostial channel present. No clear division of ostial and caudal portions of sulcus. Posterior end of sulcus with some ventral widening. No indication of ventral furrow. Outer face smooth, convex except for area near posterior end, where shallow dorsoventrally oriented depression is located.

Remarks

This species and Ariosoma nonsector  (see above) were originally described as one species by Koken (1888), but Paraconger sector  was separated by Nolf & Stringer (2003). Paraconger sector  is distinguished from Ariosoma nonsector  by its greater length compared to its height (more elongate) and a narrower sulcus. Like the previous taxon, P. sector  has a middle-to-late Eocene range in Alabama, Louisiana, Mississippi, and Virginia in the USA, and it also occurs in lower Oligocene (Rupelian) strata of Alabama, Louisiana, and Mississippi.

Stratigraphic and geographic range in Alabama

This taxon is known from the “upper” Lisbon Formation at site ACh-8 and the basal Gosport Sand at site ACl-4. Bartonian, zones NP16 and NP17.

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Anguilliformes

Family

Congridae

Genus

Paraconger

Loc

Paraconger sector ( Koken, 1888 )

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

Otolithus (Platessae) sector

Koken E. 1888: 292
Loc

Paraconger sector – Nolf 1985: 292

Nolf D. & Stringer G. 2003: 7
Nolf D. 1985: 292
Loc

Paraconger americanus – Müller 1999: 70

Muller A. 1999: 70