Glycymeris winlockensis, EFFINGER, 1938

Hickman, Carole S., 2023, Paleogene marine bivalves of the deep-water Keasey Formation in Oregon, Part II: The pteriomorphs, PaleoBios 40 (5), pp. 1-51 : 16

publication ID

https://doi.org/ 10.5070/P940561331

publication LSID

lsid:zoobank.org:pub:1756B24A-813B-423F-896F-91B21FF58A79

DOI

https://doi.org/10.5281/zenodo.10913531

persistent identifier

https://treatment.plazi.org/id/C23987DD-FFE9-292D-FF20-FAF1EAB2BAFF

treatment provided by

Felipe

scientific name

Glycymeris winlockensis
status

 

GLYCYMERIS WINLOCKENSIS EFFINGER, 1938

FIG. 9C, D View Figure 9

Glycymeris winlockensis Effinger (1938) . pp. 366–367; pl. 45, figs. 2, 5.

Glycymeris winlockensis Effinger, Weaver (1943) . p. 61; figs. 6, 13.

Discussion — Glycymeris winlockensis differs from the more common Glycymeris andersoni in its subtrigonal outline, with more prominent beaks and sloping rather than rounded dorsal hinge margin. Although radial ribs typically are not preserved on the shell exterior, they are sometimes visible where corrosion has not removed the thin exterior layer ( Fig. 9C View Figure 9 ). All known specimens are smaller than the largest shells of the more common G. andersoni , and differences in dorsal slope angle in the available specimens suggest allometric decrease in the angle ( Fig. 9C, D View Figure 9 ). More specimens are required for an accurate assessment.

Although the two species co-occur in the jumbled shellbeds at locality UCMP IP2289 and 2548, it is hypothesized that in life they occupied different habitats and depths, co-occurring allochthonously only because of the short-distance downslope transport event suggested above.

Material examined — two specimens from Loc. UCMP IP2289 View Materials .

Type information —Figured hypotypes, both from Loc. UCMP IP2289 View Materials : UCMP 110734 View Materials , length 18.8 mm, height 18.2 mm; UCMP 110735 View Materials , length 10.0 mm, height 9.9 mm.

Stratigraphic occurrence —This species is known only from the Gries Ranch Formation. It is not present in the tropical Eocene fauna of the underlying Cowlitz Formation. Glycymeridids are absent from the younger recovery faunas of the Pittsburg Bluff and Eugene Formations of the Pacific Northwest.

UCMP

University of California Museum of Paleontology

Kingdom

Animalia

Phylum

Mollusca

Class

Bivalvia

Order

Arcida

Family

Glycymerididae

Genus

Glycymeris

Loc

Glycymeris winlockensis

Hickman, Carole S. 2023
2023
Loc

Glycymeris winlockensis

Effinger, Weaver 1943
1943
Loc

Glycymeris winlockensis Effinger (1938)

EFFINGER 1938
1938
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