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. 1

( Figure 39 )

Material. Anda 4 (1).

Characterization. Shell conical, H 1.9 mm, W 1.8 mm; DN 0.21; P/T boundary at 1.0 whorls characterized by sudden onset of teleoconch ornamentation of axial and radial ribs with knobs at intersections; base of body whorl with spiral ribs; umbilicus apparently closed.

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.