Ariosoma nonsector Nolf & Stringer, 2003,

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: 189-190

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.3664359

persistent identifier

http://treatment.plazi.org/id/18174D41-FF39-FF12-FDDD-98584E9F0A5A

treatment provided by

Plazi

scientific name

Ariosoma nonsector Nolf & Stringer, 2003
status

 

Ariosoma nonsector Nolf & Stringer, 2003 

Fig. 69View Fig G–H

Otolithus (Platessae) sector Koken, 1888: 292  , pl. 17, figs 5–16.

Ariosoma  sp. – Stringer 1979: 102, pl. 1, fig. 4; 1986: 213, pl. 3, fig. 2.

Ariosoma nonsector – Nolf & Stringer 2003: 7  , pl. 2, figs 1a–6. — Nolf 2003: 3–4, pl. 1, figs 3–4; 2013: 35–37, pl. 21.

Material examined

UNITED STATES OF AMERICA – Alabama • 11 otoliths; GLS otolith comparative collection (10 specimens), MSC 39069View Materials  .

Description

Species characterized by massive otoliths; height nearly the same as the length, with height/length ratios ranging from 80–86%. Margins typically smooth. Ostial rim slightly concave, most specimens exhibiting some concavity at posterodorsal rim. Posterior margin tends to taper. Ventral rim broadly rounded, marked by distinctive angular central position. Inner face mainly smooth, convex, except for some irregular depressions in upper portion of dorsal area. Sulcus wide, only slightly incised. Sulcus extends from very near anterior margin to posterior (about 85% of sagitta length). Sulcus entirely filled with colliculum, except for dorsal extremity of ostial channel. No clear division of ostial and caudal portions of sulcus. Posterior end of sulcus broadly tapered but showing some widening ventrally. No indications of ventral furrow. Outer face smooth, convex except for area near posterior end, where shallow dorsoventrally oriented depression occurs.

Remarks

This species and Paraconger sector  (see below) were originally described as one species by Koken (1888), but Ariosoma nonsector  was separated by Nolf & Stringer (2003). This taxon is known from middle and upper Eocene deposits in Alabama, Louisiana, Mississippi, and Virginia in the USA, and it occurs in lower Oligocene (Rupelian) strata of Alabama, Louisiana, and Mississippi.

Stratigraphic and geographic range in Alabama

Ariosoma nonsector  is known only from the “upper” Lisbon Formation at sites ACh-8 and ACl-4. The lack of A. nonsector  in the Gosport Sand may be related to the very sandy nature of the formation or the lack of extensive bulk sampling. Bartonian, zones NP16 and NP17.

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Anguilliformes

Family

Congridae

Genus

Ariosoma

Loc

Ariosoma nonsector Nolf & Stringer, 2003

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

Otolithus (Platessae) sector

Koken E. 1888: 292
Loc

Ariosoma

Stringer G. L. 1979: 102
Loc

Ariosoma nonsector – Nolf & Stringer 2003: 7

Nolf D. & Stringer G. 2003: 7