Delectopecten, Hickman, 2023, Hickman, 2023

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 : 30

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.11505133

persistent identifier

https://treatment.plazi.org/id/C23987DD-FFE7-291C-FB9A-FB83ED16BCDB

treatment provided by

Felipe

scientific name

Delectopecten
status

 

DELECTOPECTEN View in CoL N. SPP.

Fragmental specimens from two localities in the Keasey formation have forms of ornamentation that differ dramatically from the two species described above as well as from one another. The inferred maximum length and height of the specimens at hand is <1 cm. In both species the sculpture changes abruptly during ontogeny. The first is from the classic Mist locality ( USGS 15318 View Materials ) and is represented by an external mold ( USNM 561848 About USNM ) in which radial and concentric ribs of equal strength on the dorsal half of the disc cross one another to form a scaly pattern that changes abruptly to a very fine radial camptonectes pattern that continues to the ventral shell margin. The second species is from a locality in the upper member ( USGS 15315 View Materials ) and is represented by an external mold with a different discrepant sculpture pattern. On this specimen the subumbonal portion of the disc is smooth, with an increasingly well-developed concentric sculpture on the dorsal portion changing abruptly to a relatively coarse cancellate pattern that continues to the ventral margin. Descriptions were never published, although Harold Vokes obtained the prospective USNM type numbers and intended to propose a new name for the upper Keasey specimens and to treat the Mist specimen in open nomenclature. The material is here considered inadequate for proposing new names. However , the distinctive sculptural patterns in these fragmental specimens call attention to the diversity in the Keasey mud pecten fauna. It is perhaps significant that the Mist specimen occurs at one of the three methane seep localities in the formation, co-occurring with the abundant propeamussiid species described below.

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Mollusca

Class

Bivalvia

SubClass

Pteriomorphia

Order

Pectinida

Family

Pectinidae

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