Promyalina schamarae
- 1. Jackson School of Geosciences, University of Texas, Austin, TX 78712, USA; & Earth Sciences, Plymouth University, Plymouth, PL 4 8 AA, UK; & Department of Earth Sciences, Natural History Museum, London, SW 7 5 BD, UK;
- 2. Earth Sciences, Plymouth University, Plymouth, PL 4 8 AA, UK; & Department of Geology, University of Georgia, Athens, GA 30602, USA
- 3. Department of Earth Sciences, Natural History Museum, London, SW 7 5 BD, UK;
Description
Promyalina schamarae (Bittner, 1899)
(Fig. 2C–G)
1899 Myalina schamarae Bittner 19, pl. 4, figs 20–25.
2009 Promyalina schamarae (Bittner); Kumagae & Nakazawa: 157, fig. 144, 4–5.
Material. Three specimens from LD-04 (NHMUK PE PEI 5484; NHMUK PI MB 1202; NHMUK PI MB 1205) and seven specimens from LD-05 (NHMUK PI MB 1188; NHMUK PI MB 1203–1204; NHMUK PE PEI 5475– 5476; NHMUK PE PEI 5500; NHMUK PE PEI 5503).
Description. Shell is small, mytiliform, inequilateral, prosocline, higher than long, and moderately inflated. Umbo is small, terminal and prosogyrate. Posterior dorsal margin is straight. Posterior margin is slightly convex, forming a rounded posteroventral margin. Anterior margin is long, nearly straight or weakly acute and partly depressed near the umbo.
Remarks. The internal characters of the shells cannot be observed because all the specimens are articulated. Externally, the shells resemble Promyalina schamarae from the Griesbachian Lazurnaya Bay Formation, Russia (Shigeta et al. 2009), and are therefore assigned to this species. These specimens differ from P. groenlandica (Newell, 1955), as the beak does not project beyond the dorsal margin, and from P. spathi in having a more convex anterior margin.
Mode of life. Surficial, stationary, attached, suspension feeder (Stanley 1972).
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- NHMUK, PI
- Family
- Myalinidae
- Genus
- Promyalina
- Kingdom
- Animalia
- Material sample ID
- MB 1188, MB 1203-1204 , PEI 5484, MB 1202, MB 1205
- Order
- Myalinida
- Phylum
- Mollusca
- Scientific name authorship
- Bittner
- Species
- schamarae
- Taxon rank
- species
- Taxonomic concept label
- Promyalina schamarae (Bittner, 1899) sec. Foster, Danise & Twitchett, 2017
References
- Bittner, A. 1899. Versteinerungen aus den Trias-Ablagerungen des Sud-Ussuri-Gebietes in der ostsibirischen Kustenprovinz. Memoires´du Comite´Geologique´, 7, 1 - 35.
- Newell, N. D. 1955. Permian pelecypods of east Greenland. Meddelelser om GrOnland, 110, 1 - 36.