Veprichlamys perillustris ( Iredale, 1925 )

Dijkstra, Henk H. & Beu, Alan G., 2018, Living Scallops of Australia and Adjacent Waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae), Records of the Australian Museum (Rec. Aust. Mus.) 70 (2), pp. 113-330 : 271-273

Veprichlamys perillustris ( Iredale, 1925)

Figs 84F,H, 85, 86A,C

Chlamys perillustris Iredale, 1925: 254 , pl. 41, figs 3–4; Gatliff & Gabriel, 1931: 232.

Mimachlamys (Veprichlamys) perillustris (Iredale) .– Iredale, 1929: 164.

Mimachlamys perillustris (Iredale) .–Macpherson & Chapple, 1951: 145; Cotton, 1961: 107, fig. 93.

Figure 85. Distribution of Veprichlamys perillustris (Iredale) .

Veprichlamys perillustris (Iredale) .–Macpherson & Gabriel, 1962: 300, fig. 342; Garrard, 1969: 5; Beu, 1995: 19; Beu & Darragh, 2001: 115, figs 39A–C, G–I; Raines & Poppe, 2006: 252–253, lower figs; 254, upper figs; pl. 197, fig. 2.

Chlamys (Veprichlamys) perillustris (Iredale) .– Rombouts, 1991: 34, pl. 28, fig. 2.

Chlamys (Chlamys) perillustris Iredale [sic].–Lamprell & Whitehead, 1992: [20], pl. 8, fig. 45.

Type data. Holotype (pr) AM C.047394. Type locality: Victoria, off Gabo Island , alive, 150–250 fathoms [274–457 m].

Additional material examined. — AUSTRALIA: NEW SOUTH WALES: NNE of Sydney , 33°42'S 151°53'– 152°0'E, alive, 406 m (3 pr, C.343937) ; off Sydney , 33°44' – 33°50' S 151°50'– 151°46'E, dead, 329–439 m (1 v, C.339094) ; off Sydney , 33°45'S 151°49'– 151°50' E, dead, 439 m (1 v, C.339155) ; E of Sydney , 33°48'– 33°43'S 151°48'– 151°51'E, dead, 421 m (1 v, C.339156) ; off Botany Bay , 34°18'– 34°20' S 151°26'– 151°23'E, dead, 457 m (1 pr, C.122960) ; NE of Wollongong , 34°18'– 34°24'S 151°26'– 151°21'E, dead, 457–466 m (2 v, C.339154) ; off Wollongong , 34°21'– 34°19'S 151°23'– 151°25'E, alive, 439 m (1 v, C.117902; 2 pr, C.120412) ; off Jervis Bay , 35°05'S 151°02'– 151°10'E, dead, 400–1000 m (2 v, C.131983) ; Batemans Bay, off Brush Island , 35°28'– 35°34' S 150°48'– 150°45'E, alive, 448–467 m (1 pr, C.343935) ; SE of Ulladulla , 35°29'– 35°25' S 150°47'– 150°50'E, dead, 440 m (1 v, C.102897) ; off Batemans Bay , 35°29'– 35°34'S 150°48'– 150°45'E, dead, 457 m (2 v, C.123378) ; ENE of Batemans Bay , 35°32'– 35°42'S 150°45'– 150°39'E, alive, 384 m (1 pr, C.343936) ; E of Eden , 36°57'– 36°58' S 150°22' – 150°22.14'E, dead, 960–1050 m (1 v, C.310695) . VICTORIA: off Gabo Island , 37°41'S 150°13'E, alive, 274–366 m (1 pr, C.047394; 1 pr, C.170816) ; between Cape Howe & Lakes Entrance, 37°55'S 149°0' E, dead, 75–78 m (21 v, C.339093); off Gabo Island , 38°06'– 38°0'S 149°58'– 150°02'E, dead, 329 m (1 v, C.339153) ; S of Gabo Island , 38°10'S 149°55'E, dead, 365 m (3 pr, C.154683) ; SE of Gabo Island ,38°12'– 38°11'S 149°49' – 149°53' E, alive, 439 m (1 pr,C.108614) ; c. 27 mls SE of Cape Everard , 38°15'S 149°12'E, dead, 165–274 m (1 v, C.094543) ; 33 mls S of Cape Conran, Bass Canyon , 38°18'S 148°39'E, dead, 750 m (1 v, C.339092) ; 30 mls S of Cape Everard , 38°30'S 149°30'E, dead, 366 m (6 v, C.339091) . TASMANIA: off Cape Naturaliste, 40°50'S 148°46'E,dead, 399 m (7 v,C.339090) ; off NE coast, 41°03'S 148°42'E,dead, 125 m (1 v,C.339089);off Cape Forestier, 42°10'S 148°34'E,dead, 205 m (1 v,C.339086); 20 mls E of Maria Island , 42°32' S 148°24'E,dead, 234 m (1 v,C.336935) ; ENE of Maria Island , 42°34'S 148°30'E,dead, 229–329 m (3 v,C.339085) ; 9.5mls NE of Tasman Island , 43°12'S 148°13' E, dead, 570.5 m (1 v,C.339088) ; E of D’Entrecasteaux Channel , 44°02'S 146°50'E, dead, 176 m (2 v, C.339087) . SOUTH AUSTRALIA: 40 mls S of Cape Wiles , 35°39'S 136°40'– 136°50'E, dead, 174–183 m (10 v, C.305945;10 v [more close-set lamellae on costae], C.032057) ; Great Australian Bight, 50 mls SW of Cape Adieu , 32°42'S 131°27'E, dead, 79 m (1 v, C.339084).

Description. Shell up to c. 37 mm high, thin, weakly inflated, strongly prosocline, almost equivalve, strongly inequilateral, anterior auricles markedly larger and longer than posterior ones, umbonal angle c. 85–90°; whitish or pale orange to orange-brown, a few specimens yellowish.

Both valves sculptured with c. 20 regular, narrow, widely spaced scaly costae and intercostal antimarginal microsculpture, forming evenly concave intercosal spaces. Pre-radial stage with short antimarginal ridgelets (Beu &

Figure 86. A, C, Veprichlamys perillustris (Iredale) , specimen in Fig.84F, H; lv exterior (A), rv interior (C).B, I, Mimachlamys albolineata (G. B. Sowerby II) , specimen in Fig. 84I–K; rv interior (B), lv exterior (I). D, G, Mimachlamys funebris (Reeve) , WAM S55490, Entrance Point, Broome, WA; rv interior (D), lv exterior (G). E, F, Mimachlamys asperrima (Lamarck) , AM C.097543, D’Entrecasteaux Channel, TAS, 18 m; rv interior (E), lv exterior (F). H, J, Mimachlamys cloacata (Reeve) , AM C.103803, off Picnic Point, Hervey Bay, QLD, 9–12 m; lv exterior (H), rv interior (J). Scale bars represent 20 mm (A, C, D, G), 10 mm (B, H–J), 30 mm (E, F).

Darragh, 2001: fig. 39G, I), continuing intercostally over disc; antimarginal ridgelets long and straight near centre of disc. Anterior auricles with 3–4 narrow, weakly scaly radial riblets; posterior auricle of left valve smooth, of right valve with 4–5 prominent squamous radial riblets. Byssal notch relatively deep, byssal fasciole broad. Functional ctenolium well-developed, with 5–6 teeth.

Dimensions. Illustrated specimen: VIC, S of Gabo I., 365 m ( AM C.154683): rv: H 37.0, L 33.0 mm; lv: H 37.3, L 32.6 mm; D 11.0 mm. Iredale (1925: 254) stated the dimensions of the holotype as H 29, L 25 mm .

Habitat. Living on the continental shelf and in the upper bathyal zone, probably byssally attached to hard substrates on soft bottoms.

Distribution. Australian temperate waters, from New South Wales (c. 33°S) southwards to the Great Australian Bight. Present specimens alive at 274– 467 m.

Remarks. This species closely resembles its New Zealand congener Veprichlamys kiwaensis ( Powell, 1933) (Dijkstra & Marshall, 2008: 61, figs 51–52), differing mainly in shape ( V. perillustris is much more strongly prosocline than V. kiwaensis ) and sculpture ( V. perillustris has about 20 costae, V. kiwaensis about 25, with secondary interstitial riblets near the ventral margin in some specimens that are absent from V. perillustris ). Veprichlamys kiwaensis also consistently has pink radial costae on a paler ground, whereas the costae are not distinctively coloured in V. perillustris .