Ilanga konos ( Vilvens, 2009 )

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 : 127

Ilanga konos ( Vilvens, 2009) nov. comb.

( Figures 64–68 )

2009 Microgaza konos nov. spec.—Vilvens: p. 88, figs 64–66.

Material. Anda 1 (5); Anda 2 (2); Anda 6 (1); AndaDeVos (9); Tiep 2 (3).

Characterization. Shell broad and umbilicate H 1.3 mm, W 2.1 mm; P with distinct spiral ribs and axially arranged granulate microsculpture, DN 0.13–0.16 mm; P/T boundary sharp at 1.1 whorls; four spiral ribs on early T whorls, later whorls smooth; pinkish blotches; umbilical ridge narrow, four spiral ribs or more in umbilicus.

Distribution. Apart from the studied material, Ilanga konos is known only from the type locality Bashi channel, south Taiwan, from a depth of 305 m ( Vilvens 2009).

Remarks. This species has been reassigned to Ilanga on the basis of genetic data that shows that all western Pacific and Indian Ocean ‘ Microgaza’ like species, such as Microgaza konos , fall into a clade with the type species of Ilanga ( Williams et al. 2013) . Both Herbert (1987) and Marshall (1999) recognize Ilanga and Microgaza as distinct genera, but additional genetic studies are needed to confirm the delimitation of each.

Figures

FIGURES 64 – 68. Solariellidae. 64. Ilanga konos (Vilvens, 2009). RGM 608.366. Locality Anda 1. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 65. Ilanga konos (Vilvens, 2009). RGM 608.367. Locality Tiep 2. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 66. Ilanga konos (Vilvens, 2009). RGM 608.368. Locality Tiep 2. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 67. Ilanga konos (Vilvens, 2009). RGM 608.369. Locality AndaDeVos. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 68. Ilanga konos (Vilvens, 2009). RGM 608.370. Locality Anda 1. SEM detail of protoconch.