Astarte trapezoidalis, Stanton, 1895

Kaim, Andrzej, Jenkins, Robert G., Tanabe, Kazushige & Kiel, Steffen, 2014, Mollusks from late Mesozoic seep deposits, chiefly in California, Zootaxa 3861 (5), pp. 401-440: 430-431

publication ID

http://dx.doi.org/10.11646/zootaxa.3861.5.1

publication LSID

lsid:zoobank.org:pub:E62DB6C3-0C5F-4898-99C4-1BEC70DD1734

persistent identifier

http://treatment.plazi.org/id/03F4372E-FFFB-6850-FF34-0310FB95FD4C

treatment provided by

Plazi

scientific name

Astarte trapezoidalis
status

 

Oxyeurax trapezoidalis  ( Stanton, 1895)

( Fig. 16View FIGURE 16)

Astarte trapezoidalis Stanton 1895  , p. 57–58, pl. 6, figs. 17–18.

Supplementary description. Anterior adductor muscle scar slightly oval, pedal retractor scar small and round and separated from the adductor muscle scar. The pallial line is entire; on the interior of the anteroventral side of the shell, several radial grooves appear near the pallial line, run across it, but fade before reaching the margin. The posterior adductor muscle scar is indistinct. At the posterodorsal margin of the shell, the fine commarginal sculpture stops at the sharp crest that forms the edge of the escutcheon; the interior of the escutcheon is smooth. The ligament is short and reaches only about a third of the length of the escutcheon.

Material and occurrence. 27 specimens from Bear Creek (Valanginian, Early Cretaceous), 58 from Rocky Creek (probably Valanginian, Early Cretaceous) and one from Eagle Creek (Late Barremian, Early Cretaceous); Stanton’s type material from Knoxville and Reiff, two localities in the general area of Rocky Creek, was also investigated ( USNM 23104).

Remarks. Stanton (1895, p. 58) noted that ‘internal casts (from another locality) show impressions of the hinge, which also seem to agree with it [its position within Astarte  ]’. The mentioned internal cast was found among Stanton’s type material ( USNM 23104) and is from ‘Knoxville, near Reiff P.O., 1 mile N.W. of Palmer’s ranch, Morgan Valley’ ( Stanton 1895, p. 58), which is to the south of the Rocky Creek site; this specimen shows two cardinal teeth in each valve and is illustrated here ( Fig. 16View FIGURE 16 D). A similarly elongate species with an anterior umbo is Oxyloma cyphopleura Gardner & Campbell, 2002  from the Middle Temaikan (Bajocian –Bathonian) Tucks Bay Formation in South Otago, New Zealand ( Gardner & Campbell 2002, p. 38, fig. 32).

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Mollusca

Class

Bivalvia

Order

Carditoida

Family

Astartidae

Genus

Astarte

Loc

Astarte trapezoidalis

Kaim, Andrzej, Jenkins, Robert G., Tanabe, Kazushige & Kiel, Steffen 2014
2014
Loc

Astarte trapezoidalis

Stanton 1895
1895
Loc

trapezoidalis

Stanton 1895
1895