Pseudanchura biangulata ( Anderson, 1938 ), Anderson, 1938

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: 421

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Pseudanchura biangulata ( Anderson, 1938 )


Pseudanchura biangulata ( Anderson, 1938)  

( Fig. 9 A –D View FIGURE 9. A – D )

1938 Anchura biangulata Anderson   , n. sp.; Anderson 1938, pl. 9, figs. 4–6.

Description. The best preserved specimen ( CAS 73132 View Materials ) is composed of six high-spired whorls. Two earliest are rounded with poorly visible ornamentation spiral riblets while the third whorl bears no ornamentation apart from strong median keel. The aperture and apertural extensions not preserved in the investigated specimens.

Material and occurrence. Two poorly preserved juvenile specimens ( CAS 73132 View Materials , 73133). Eagle Creek (Late Barremian, Early Cretaceous).

Remarks. P. biangulata   has been reported from a couple of localities in the Ono area by Anderson (1938) and it remains uncertain whether they were seep locations or "normal" deep water sediments. Most likely the association of P. biangulata   with seep carbonates is fortuitous as aporrhaids are gastropods typical for soft bottom marine environments during Mesozoic times and they have been found at various Jurassic to Paleocene seep deposits ( Kaim et al. 2008 b; Kiel et al. 2010, 2013; Agirrezabala et al. 2013).


California Academy of Sciences