Zoila dolichorhyncha, Darragh, 2011

Darragh, Thomas A., 2011, A revision of the Australian fossil species of Zoila (Gastropoda: Cypraeidae), Memoirs of Museum Victoria 68, pp. 1-28 : 11-14

Zoila dolichorhyncha sp. nov.

Figures 8A–F , 9C–E

Description. Shell of large size for genus, solid, pyriform, somewhat humped posteriorly and tapering anteriorly, of six teleoconch whorls. Spire projecting slightly, almost enveloped by last whorl, covered with thick callus. Protoconch of one smooth whorl, not differentiated from teleoconch whorls, coiled with the axis of the shell. Posterior canal short, deeply incised, reflexed to left. Anterior canal deeply incised, with rounded sides, reflexed dorsally, supported laterally by short, narrow flanges. Aperture sinuous, slightly widened and sloping steeply inwards before anterior canal; outer lip with 23–33 teeth extending along entire lip, on some specimens becoming very weak posteriorly; inner lip with 3–11 teeth (generally fewer than 10) present on anterior third of lip. Fossula well developed, broad, relatively deeply depressed, bounded anteriorly by weak terminal ridge.

Dimensions.

Type locality. Lower bed, Table Cape, Wynyard , Tasmania, (i.e. PL3028 lower bed in cliff between Fossil Bluff and l. 5 km northwest towards Table Cape, Wynyard , Tasmania, Table Cape 930630). Freestone Cove Sandstone , Early Miocene , early Longfordian .

Type material. Holotype P14514, purchased R.N. Atkinson, 8 May 1911; paratypes P304417-8, purchased R.N. Atkinson, 15 January 1910.

Time range. Longfordian, Early Miocene

Occurrence and material. Table Cape (P2644, P14618, P2766- 2770, P14595-6, P304417, P304449-50, 11 specimens) ; Crassatella bed, Fossil Bluff (P304440, one specimen) ; lower bed, Table Cape (P308708, P304431, P304433, seven specimens) .

Remarks. This species has been mistaken for Zoila platypyga (McCoy) and recorded as such in lists of fossils from Table Cape published by Johnston (1888, p. 262) and Pritchard (1896, p. 106). It probably evolved from Z. glomerabilis sp. nov., from which it differs by being pyriform with a tapering anterior rather than being globose. Zoila glomerabilis has a uniformly rounded dorsum, whereas Z. dolichorhyncha sp. nov. has a dorsum humped posteriorly.

Etymology. Greek, dolichos, long; rhynchos, snout.

Figures

Figure 8. A–F, Zoila dolichorhyncha; A, C, E, paratype, P304418, PL3028, × 1; B, D, F, holotype, P14514, PL 3028, × 1.

Figure 9. A–B, Zoila mulderi holotype, SAM T822, Belmont, × 1; C–E, Z. dolichorhyncha, paratype, P304417, PL 3028, × 1.

Dimensions.