Callogaza sericata ( Kira, 1959 )

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 : 23

Callogaza sericata ( Kira, 1959)

( Figs. 45–48 )

Gaza sericata Kira 1959: 17 (pl. 8, fig. 13). Kira 1962: 14 (pl; 9, fig. 12). Bieler & Petit 1990: 135; Hardy, 2005 (unnumbered text­fig.), Yamada, 2005 (unnumbered text­fig.).

Callogaza sericata: Okutani 2000: 60–61 (fig. 36).

Types: 5 syntypes OMNH 1390 (Kira collection) (examined) .

Type locality: Japan .

Diagnosis: Shell color pale beige with dark brown spots, spire as tall as body whorl, with about six whorls. Protoconch without hole in adult. Height/width 1.18 on average. Umbilicus completely covered by callus.

Distinctive description

Shell ( Figs. 45–48 ): size about 15 mm. Color pale beige with dark brown spots spread almost uniformly (about 6–7 on last whorl) as irregular axial bands; pale cream small spots organized as successive axial, interrupted bands (about 12 on body whorl: Figs. 47, 48 ) profile turbiform; spire height nearly as tall as body whorl, about same volume. Spire profile triangular; whorls slightly convex, suture well marked. Protoconch smooth, glossy, with about 2 whorls ( Fig. 46 ). Sculpture composed of 5–6 relatively large spiral cords at periphery, well separated from each other, slightly elevated from surface; area between upper of these cords and adjacent upper suture, 5–6 narrow spiral lines, close to each other; about 70 weak, narrow axial lines. Sculpture inside body whorl composed of equally developed axial and spiral lines forming reticulation, up to peri­umbilical area. Callus sealing entire lower region of umbilical opening ( Figs. 47, 48 ).

Measurements (in mm): OMNH (figured syntype): 16.3 x 12.5; MZSP 48530: 15.0 x 13.5 mm.

Distribution: From Japan to Philippines.

Habitat: 50 to 300 m depth.

Material examined: Syntypes. PHILIPPINES; Alliguay, 50–80 m depth, 1 shell, MZSP 48530 (Michel Jourdan leg., dredged). JAPAN; West Amami Island, near Jokoateshima, 160–250 m depth, MZSP 67143, 2 shells (fishermen col. by nets, vi/2005; Femorale). Photos of Japanese specimen in Hardy (2005) (6 shells) and Yamada (2005) (3 shells).

Figures

FIGURES 37–48. Shells. Figs. 37–40: Gaza rathbuni Holotype USNM 97054. Figs. 37–39: Shell in apertural, apical and umbilical views. Fig. 40: Detail of umbilical area; Diameter: 38 mm. Figs. 41–44: Callogaza watsoni Holotype MCZ 7544, a specimen with peristome not formed. Figs. 41–43: Shell in apertural, apical and umbilical views. Fig. 44: Detail of umbilical area; Diameter = 11 mm. Figs. 45–48: C. sericata MZSP 48530 from Aliguay, Philippines. Figs. 45–47: Shell in apertural, apical and umbilical views. Fig. 48: Detail of umbilical area. Diameter = 15 mm.