Gaza daedala Watson, 1879

Simone, Luiz Ricardo L. & Cunha, Carlo M., 2006, Revision of genera Gaza and Callogaza (Vetigastropoda, Trochidae), with description of a new Brazilian species, Zootaxa 1318 (1), pp. 1-40 : 13-14

Gaza daedala Watson, 1879

( Figs. 16–19 )

Gaza daedala Watson, 1879: 602–603 . Thiele 1929: 78. Clench & Abbott 1943: 2.

Types: Holotype BMNH 8729346 (examined).

Type locality: FIJI, Kandavu , 19º10’S 178º10’E, 1128 m depth .

Diagnosis: Color of entire shell pale­beige iridescent; surface opaque, spire about as high as body whorl; about six whorls. Protoconch without hole in adult. Spire profile slightly convex straight. Body whorl with evident spiral lines, spire diameter about 80% of total shell diameter. Carina in lower region of body whorl. Umbilicus completely covered by callus.

Distinctive description

Shell ( Figs. 16–19 ): Large, spire height about same as body whorl, about 3/4 its volume. Spire profile almost straight; very weakly convex, suture shallow. Sculpture similar to that of G. compta , with about 25 spiral lines in penultimate whorl. Spire with first 3.5 whorls smooth ( Fig. 17 ), gradually axial lines appearing closer to upper suture; then spiral, axial lines becoming equally developed, except near aperture with spiral lines predominating. Body whorl with weak spiral carina between middle and lower thirds. Callus covering entirely umbilical opening ( Figs. 18, 19 ).

Measurements (in mm): Holotype = 20.6 x 17.0.

Distribution: Fiji Islands.

Habitat: About 1100 m depth.

Material examined: Holotype.

Figures

FIGURES 11–23. Gaza spp. Figs. 11–15: G. superba Paralectotype USNM 94992. Figs. 11–13: Shell in apertural, apical and umbilical views. Fig. 14: Detail of umbilical area. Fig. 15: Operculum, outer view. Scale bar = 10 mm. Figs. 16–19: G. daedala Holotype BMNH. Figs. 16–18: Shell in apertural, apical and umbilical views. Fig. 19: Detail of umbilical area. Scale bar = 5 mm. Figs. 20–23: G. cubana Holotype MCZ 135151. Figs. 20–22: Shell in apertural, apical and umbilical views. Fig. 23: Detail of umbilical area. Scale bar = 5 mm.