Jefitchia copelandi Frizzell & Dante, 1965,

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: 215-216

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.3664459

persistent identifier

http://treatment.plazi.org/id/18174D41-FF53-FF78-FDDA-99734EE30BC4

treatment provided by

Plazi

scientific name

Jefitchia copelandi Frizzell & Dante, 1965
status

 

Jefitchia copelandi Frizzell & Dante, 1965 

Fig. 71View Fig Q–R

Jefitchia copelandi Frizzell & Dante, 1965: 705  , pl. 87, figs 3–4, 9, pl. 88, figs 1–2, 6.

“genus Sciaenidarum ” aff. copelandi – Müller 1999: 161  , pl. 33, fig. 22.

“ Sciaenida ” copelandi – Nolf 2013: 107  , pl. 281.

Material examined

UNITED STATES OF AMERICA – Alabama • 21 otoliths; MSC 7299.1, MSC 7299.2, MSC 7299.3, MSC 39042.9, MSC 39042.10, MSC 39042.11, MSC 39042.13, MSC 39053View Materials, GLS otolith comparative collection (11 specimens), WSU CC 473.3View Materials, WSU CC 473.4View Materials  .

Description

Sagitta subcircular to subquadrate in outline. Height/length ratios exhibit considerable range related to increasing size. Smaller specimens (less than 2.5 mm) have ratios from around 65–75%; larger specimens (some exceed 12 mm) range from around 80–90%. Inner face convex, smooth. Margins smooth except for fine crenulations on very small juveniles. Dorsal margin nearly straight to somewhat arched. Conspicuous posterodorsal angle. Posterior margin straight to slightly curving inward; ventral margin broadly but unevenly rounded. Anterior margin evenly rounded. Very prominent heterosulcoid-type sulcus. Ostium filled with colliculum, moderately narrow, covers about 35% of length of inner face. Anterior of ostium even with anterior margin of sagitta. Dorsal and ventral margins of ostium essentially parallel anteriorly, but arch outwardly in posterior portion. Posterior margin of ostium nearly vertical. Cauda very long and narrow, has horizontal portion and sharply downturned portion. Horizontal portion of cauda significantly shorter than downturned portion, less excavated. Downturned portion of cauda more excavated, significantly longer, wider. Angle of horizontal and downturned portions around 90-degrees. Downturned portion almost reaches ventral margin. Outer face usually slightly concave, sculptured.

Remarks

Jefitchia copelandi  has characteristics in common with Sciaena intermedius  (see above), but J. copelandi  is easily distinguished by its narrower ostium, and the dorsal and ventral margins of the ostium are essentially straight and parallel in the anterior portion ( Nolf 2013: pl. 281). Jefitchia copelandi  is also similar to J. claybornensis  (see below) but differs by the less elongate outline (higher height/length ratios) of J. copelandi  , as well as by its much longer downturned portion of the cauda, and the angle of the downturned portion of the cauda (90-degrees or more from horizontal). The species appears to have a wide geographical range in the Eocene, as it is known from numerous locations in Alabama, Louisiana, Mississippi, Texas, and Virginia ( Frizzell & Dante 1965; Breard & Stringer 1999; Müller 1999).

Stratigraphic and geographic range in Alabama

Sagittae of J. copelandi  have been recovered from the “upper” Lisbon Formation at site ACh-8 and the Gosport Sand at site AMo-4. Bartonian, zones NP16 and NP17.

WSU

Weber State University, Bird and Mammal Collection

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Perciformes

Family

Sciaenidae

Genus

Jefitchia

Loc

Jefitchia copelandi Frizzell & Dante, 1965

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

Jefitchia copelandi Frizzell & Dante, 1965: 705

Frizzell D. L. & Dante J. H. 1965: 705