Dysedrosia borneoensis ( Dall, 1920 )

Bitner, Maria Aleksandra, 2025, Recent brachiopods from north-western Australia, Zootaxa 5631 (3), pp. 495-508 : 499

Dysedrosia borneoensis ( Dall, 1920)

( Fig. 2L–N )

1920 Gryphus borneoenesis Dall , p. 314.

1937 Gryphus borneoensis (Dall) —Jackson & Stiasny, pp. 13–14, pl. 2, figs. 19–23.

1981 Gryphus borneoensis (Dall) —Zezina, p. 13, pl. 3, figs. 1–2.

1983 Dysedrosia borneoensis (Dall) —Cooper, p. 256, pl. 10, figs. 20–27, pl. 65, figs. 23, 24.

2010 Dysedrosia borneoensis (Dall) —Zezina, p. 1183.

Material examined. NW Australia, Kimberley , Cape Leveque, stn SO1/84/082, 13°07.2’S, 123°15.7’E, 15 February 1984, coll. S.M. Slack-Smith —one complete specimen ( WAM Z59468 ) .

Depth range. 400 m.

Measurements. Length 50.2, width 36.4, thickness 31.2 mm.

Remarks. This is the first record of this species from NW Australia, having previously been recorded off Indonesia, Borneo and Kei Island ( Jackson & Stiasny 1937; Zezina 1981; Logan 2007). It is very rare in the material examined, represented by only one specimen. Dysedrosia borneoensis is a very large species, characterized by an elongate outline and broad folding. Its surface is smooth ornamented only by indistinct, numerous growth lines. The beak is erect with a large, labiate epithyrid foramen.

Figures

FIGURE 2.A, B, Lingula anatina Lamarck, 1801, outer views of complete specimens, WAM Z59480, NWAustralia, Kimberley, Roebuck Bay. C, Thecidellina blochmanni Dall, 1920, dorsal view of complete specimen, ventral beak broken, WAM Z59479, Christmas Island, Dolly Beach, stn 15, 12–25 m, SEM. D–K, Dallithyris murrayi Muir-Wood, 1959; D, E, dorsal and lateral views of complete specimen, WAM Z59452, Lacepede Archepelago, stn SO1/84/055, 296–298 m; F–K, dorsal, lateral and anterior views of complete specimens, WAM Z59468, NW Australia, Kimberley, Cape Leveque, stn SO1/84/082, 400 m. L–N, Dysedrosia borneoensis (DALL, 1920), WAM Z59468, Kimberley, Cape Leveque, stn SO1/84/082, 400 m.