Jolonica hedleyi Dall, 1920

(Fig. 4B–D)

1920 Campages (Jolonica) hedleyi Dall, pp. 366–367.

1937 Jolonica hedleyi Dall—Jackson & Stiansy, pp. 16–17, pl. 2, figs. 24–27.

1957 Jolonica hedleyi Dall—Cooper, p. 13, pl. 4, figs. 33–45.

1981 Jolonica hedleyi Dall—Zezina, p. 16.

2010 Jolonica hedleyi Dall —MacKinnon & Hiller, p. 194, text-fig. 1A–D.

2010 Jolonica hedleyi Dall—Zezina, p. 1190.

Material examined. NW Australia, Kimberley, Cape Leveque, stn SO1/84/064, 14°50.2’S, 121°31.4’E to 14°48.7’S, 121°33.2’E, 356 m, 12 February 1984, coll. S.M. Slack-Smith —one complete specimen (WAM Z59463); Kimberley, Cape Leveque, stn SO1/84/085, 14°52.2’S, 121°41.7’E to 14°53.7’S, 121°39.9’E, 220–224 m, 16 February 1984, coll. S.M. Slack-Smith —one ventral valve (WAM Z59470) .

Depth range. 220–356 m.

Measurements. Length 18.1 mm, width 14.7 mm, thickness 10.1 mm; length 24.5 mm, width 17.9 mm.

Remarks. Jolonica hedleyi is very rare in the material under study. The shell is elongate oval, ventri-biconvex, with a smooth surface and broadly sulcate anterior commissure. The ventral valve is with a large, circular, permesothyrid foramen. The pedicle collar is closely applied to the floor (sessile). The teeth are short but wide, supported by strong dental plates. The investigated specimens show a more elongate outline than the holotype (see Cooper 1957; MacKinnon & Hiller 2010). This is the first record of this species from off Australia, previously known from China, the Philippines and the Malay Archipelago (Dall 1920; Jackson & Stiasny 1937; Zezina 1981, 2010; Logan 2007; MacKinnon & Hiller 2010). Recently Robinson et al. (2023) mentioned, however without description and/or illustrations, the presence of J. hedleyi from New Zealand, thus the geographic range of this species would be strongly extended.