Echinolittorina sundaica (van Regteren Altena, 1945)

Reid, David G., 2007, The genus Echinolittorina Habe, 1956 (Gastropoda: Littorinidae) in the Indo-West Pacific Ocean, Zootaxa 1420 (1), pp. 1-161 : 50

Echinolittorina sundaica (van Regteren Altena, 1945)

( Figures 23 –25, 26A, B)

Littorina (Melaraphe) sundaica van Regteren Altena, 1945: 144 , 151–152, fig. 2 ( Tjilaoet Eureun , south coast of Java [Cilaut Eureun, Java, Indonesia]; holotype NNML 52038, Fig. 24F). Dharma, 1997: 165–166 (map).

Littorina (? Littoraria ) sundaica — Rosewater, 1970: 423, 450, pl. 349, figs 1, 2, pl. 350 (map).

Littorina (Austrolittorina) sundaica — Ponder & Rosewater, 1979: 777–779, pl. 2, figs 1-4, pl. 3, figs 1, 2 (radula, penis).

Nodilittorina (Nodilittorina) sundaica — Reid, 1989a: 100.

Nodilittorina sundaica — Reid, 2001a: 442, figs 2F, 3G (penis). Reid, 2002a: 259–281.

Echinolittorina sundaica — Williams et al., 2003: 83. Williams & Reid, 2004: 2227–2251.

Taxonomic history: This species is entirely distinctive, but was only named in 1945, probably as a consequence of its small size and restricted distribution.

Diagnosis: Shell small, tall; smooth or with fine incised spiral lines; black to brown, paler or marked with white at suture, pale band on base. Indian Ocean coast of southern Sumatra and Java, Bali. COI: GenBank AJ623047 , AJ623048 .

Material examined: 21 lots (including 5 penes, 2 sperm samples; 5 pallial oviducts, 4 radulae).

Shell (Fig. 24): Mature shell height 3–8.3 mm. Shape tall (H/B = 1.57–1.89, SH = 1.78–2.52); spire whorls only slightly rounded, suture distinct; spire profile straight; periphery of last whorl slightly angled. Columella short, straight, flattened at base, sometimes slightly pinched; no eroded parietal area. Sculpture of last whorl: smooth but for incised spiral lines, 7–11 above periphery, 7–8 below; periphery marked by wider space between spiral lines, not raised as a rib; sculpture often obsolete towards suture, or entirely absent; surface glossy, no microstriae. Protoconch 0.28 mm diameter, 2.5–2.7 whorls. Colour: dark brown to black, paler at suture, pale band or line on base; sometimes a few irregular white marks at suture, periphery or on base (Fig. 24A), rarely faint grey marbling over surface, but not forming a regular tessellation; aperture dark brown, pale band at base; columella dark brown.

Animal (Fig. 25): Head (Fig. 25A, B) black, usually a narrow unpigmented stripe across snout, tentacle

Figures

FIGURE 23. Distribution of Echinolittorina pascua (open squares), E. sundaica (solid triangles), E. cinerea (solid circles), and E. hawaiiensis (open circles). Literature records: A, Dharma (1997); B, Rosewater (1970); C, Fujioka & Kurozumi (1980); D, Kurozumi (1994); E, Vermeij et al. (1984).