Calliobasis lapulapui Poppe, Tagaro & Dekker, 2006

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 : 111-114

Calliobasis lapulapui Poppe, Tagaro & Dekker, 2006

( Figures 18–19 )

2006 Calliobasis lapulapui nov. spec.—Poppe et al.: p. 21, pl. 1, fig. 2. 2008a Calliobasis lapulapui —Poppe & Tagaro: p. 160, pl. 25, fig. 1.

Material. Anda 1 (72); Anda 2 (81); Anda 3 (44); Anda 4 (83); Anda 5 (1); Anda 6 (2); AndaDeVos (3); Roxas (1); Tiep 3 (3); Tiep 5 (5).

Characterization. Conical shell with regularly-spaced, well-defined erect sigmoid axial ribs, H 2.5 mm, W 2.6 mm; P globular, 1.1 whorls, DN 0.10 mm; one or two spiral ribs on lower T whorls; body whorl with strong keel; base with nine spiral ribs; plane of aperture tilted downwards; outer lip with strong upper and lower retractions.

Distribution. Apart from the studied material, Calliobasis lapulapui has been reported from the Dipolog Bay, Mindanao Island, Philippines, 172–175 m depth ( Poppe et al. 2006).

Remarks. The specimen shown in Poppe et al. (2006) does not have the elaborate outer lip organisation, but is likely not fully grown. It is smaller than the fossil material studied here (H 2.2 mm versus H 2.53 mm). The shape of the shell and the ornamentation are the same as in the fossils studied here.

Subfamily Asthelysinae Marshall, 1991

Figures

FIGURES 18 – 25. Seguenziidae. 18. Calliobasis lapulapui Poppe, Tagaro & Dekker, 2006. RGM 608.251. Locality Anda 1. (a) rear view, (b) apertural view, (c) side view, (d) basal view, (e) apical view. 19. Calliobasis lapulapui Poppe, Tagaro & Dekker, 2006. RGM 608.252. Locality Anda 3. (a) SEM, side view, (b) SEM detail of protoconch. 20. Thelyssina? spec. 1. RGM 608.263. Locality Anda 2. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 21. Thelyssina? spec. 1. RGM 608.264. Locality Anda 2. (a) SEM detail of protoconch, (b) SEM, side view. 22. Thelyssina? spec. 1. RGM 608.265. Locality Anda 2. SEM, basal view. 23. Thelyssina? spec. 2. RGM 608.268. Locality AndaDeVos. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 24. Thelyssina? spec. 2. RGM 608.269. Locality AndaDeVos. SEM detail of protoconch. 25. Thelyssina? spec. 2. RGM 608.270 Locality AndaDeVos. SEM, basal view.