Calliostoma

Helwerda, Renate Ariane, Wesselingh, Frank Pieter & Williams, Suzanne T., 2014, On some Vetigastropoda (Mollusca, Gastropoda) from the Plio-Pleistocene of the Philippines with descriptions of three new species, Zootaxa 3755 (2), pp. 101-135 : 119

Calliostoma spec. 2

( Figures 40–44 )

Material. Anda 2 (2 juveniles and 2 partially preserved subadults); Anda 3 (2 juveniles); Anda 4 (1 subadult partially preserved); Anda 6 (2 juveniles); AndaDeVos (2 juveniles); AndaClif3 (1 juvenile).

Characterization. Shell conical, H 1.6 mm, W 1.4 mm; DN 0.18–0.20 mm; distinct terminal varix marks P/T boundary at 1.1 whorls; spiral and axial sculpture with spines at intersections; lower primary rib develops into peripheral row of spines; sutural ramp progressively concave; base of studied material damaged; umbilicus probably open, encircled by two rows of granules.

Figures

FIGURES 39 – 44. Calliostomatidae. 39. Calliostoma spec. 1. RGM 608.304. Locality Anda 4. (a) rear view, (b) apertural view, (c) basal view, (d) apical view, (e) detail protoconch. 40. Calliostoma spec. 2. RGM 608.305. Locality Anda 3. (a) rear view, (b) apertural view, (c) side view, (d) basal view, (e) apical view. 41. Calliostoma spec. 2. RGM 608.306. Locality Anda 6. (a) rear view, (b) apertural view, (c) basal view. 42. Calliostoma spec. 2. RGM 608.307. Locality Anda 2. (a) basal view, (b) apical view, (c) rear view. 43. Calliostoma spec. 2. RGM 608.308. Locality Anda 2. (a) rear view, (b) apertural view, (c) apical view. 44. Calliostoma spec. 2. RGM 608.309. Locality Anda 3. SEM detail of protoconch.