Sinetectula farinosa ( Gould, 1850 ) Fraussen & Vermeij, 2021

Fraussen, Koen & Vermeij, Geerat J., 2021, Sinetectula gen. nov., a new genus of Pisaniidae (Gastropoda: Buccinoidea) from the tropical Indian and Pacific Oceans, European Journal of Taxonomy 748, pp. 155-176 : 166-168

Sinetectula farinosa ( Gould, 1850) gen. et comb. nov.

Figs 4–5 , 10F–G

Buccinum (Pollia) farinosum Gould, 1850: 152–153 (holotype in USNM 5719, figured by Cernohorsky 1975: 190, fig. 40).

Hindsia angicostata Pease, 1860: 142 (lectotype and one paralectotype in NHM( UK): BMNH-1961159 and 1961160).

Hindsia angicostata – Kay 1965: 16–17, pl. 1 figs 15–16 (see Fig. 10f–g ).

Engina farinosa – Cernohorsky 1975: 190, figs 40–42. — Robin 2008: pl. 189 fig. 10.

Cantharus farinosus – Kay 1979: 261, figs 91e–f, 92d.

Type localities

Buccinum (Pollia) farinosum : Hawaii, “Sandwich Islands, Kauai”.

Hindsia angicostata : “Sandwich Islands”.

Material examined

MARSHALL ISLANDS • 12 lv; Kwajalein, West Reef ; depth 30–35; F. Lorenz leg.; 1989; KF 4757 • 7 dd; Kwajalein, ocean side of West Reef , in cave; depth 12 m; F. Lorenz leg.; 1989; KF 4765 • 19 dd; Kwajalein, ocean side of West Reef, in cave; depth 12 m; F. Lorenz leg.; 1991; KF 4766 (see Fig. 4A–G ) .

MOZAMBIQUE • 2 lv; Fernao Veloso Bay ; depth 3–4 m; J. Rosado leg.; KF 5378 (see Fig. 4H–I ) • 1 dd; “ Mozambique ”; KF 5031 .

SAMOA • 1 lv; western Samoa ; KF 5276 .

Distribution

Sinetectula farinosa gen. et comb. nov. has a remarkably wide range, from eastern Africa (KF) to Japan ( Okutani 2000: 477, pl. 237 fig. 113, as Hindsia nivea ), Hawaii ( Pease 1860: 142) and the Marshall Islands (KF).

Remarks

Sinetectula farinosa gen. et comb. nov. is recognisable by its broad, ovate shell in combination with a rather cancellate sculpture.

The furrowed edge of the labral lip is typical of the genus, very similar in shape to S. egregia , with a similar tendency to arrange the cusps in pairs, but the slightly deeper basal notches accentuate the basal cusp much less (see Fig. 4B, F ).

The protoconch is multispiral, consisting of 2 to 2½ whorls, the last whorl with a tiny suprasutural spiral keel (see Fig. 4D ).

Sinetectula egregia gen. et comb. nov. differs from S. farinosa gen. et comb. nov. by its lower number of protoconch whorls (1 vs 2 to 2½), the slender shape with a higher spire, the weaker sculpture with finer spiral cords and finer axial ribs, the weaker denticles on the columella and the higher number (usually 12) but weaker knobs inside the outer lip.

Figures

Fig. 4. Sinetectula farinosa (Gould, 1850) gen. et comb. nov. A–D. Specimen from the Marshall Islands, Kwajalein Atoll, in cave at Oceanside of West reef, depth 12 m, 14.6 mm long (KF 4766). E–G. Specimen with same collection data as for preceding, 15.6 mm long (KF 4766). H–I. Specimen from Mozambique, Fernao Velosa Bay, depth 3–4 m, 18.6 mm long (KF 5378). Scale bar: 2.0 mm.

Fig. 5A–B. Sinetectula farinosa (Gould, 1850) gen. et comb. nov., in situ, Marshall Islands, Kwajalein Atoll, images courtesy of Jeanette Johnson, © 2015 In-Depth Images Kwajalein.

Fig. 10. Original figures and types. A. Syntype ofTriton egregius Reeve, 1844, original figure taken from Reeve (1844b: pl. 18 fig. 78). B–C. Types of Phos amoenus Schwengel, 1950, taken from Schwengel (1950: pl. 5 fig. 4). B. Holotype, 15 mm long. C. Paratype, 13–14 mm long. D. Type of Buccinum cinis Reeve, 1846, original figure taken from Reeve (1846: pl. 11 no. 84). E. Syntype of Caducifer? thaleia Pilsbry & Lowe, 1932, original figure taken from Pilsbry & Lowe (1932: pl. 6 fig. 6), 26.3 mm long. F–G. Lectotype of Hindsia angicostata Pease, 1860, taken from Kay (1965: pl. 1; figs 15–16), 15.5 mm long. H. Syntype of Pisania naevosa Martens, 1880, original figure taken from Martens (1880: pl. 20 fig. 8), 16 mm long. I–Q. Syntypes of Pisania naevosa Martens, 1880, MFN, ZMB/Moll-22029, images courtesy of Christine Zorn, Berlin. I–K. 16.3 mm long. L–M. 15.1 mm long. N–O. 14.9 mm long. P–Q. 16.3 mm long. R. Type of Buccinum nigricostatum Reeve, 1846, original figure taken from Reeve (1846: pl. 10 fig. 73). S. Holotype of Pollia shepstonensis Tomlin, 1926, original figure taken from Tomlin (1926: pl. 16 fig. 4), 24 mm long. T. Holotype of Pollia shepstonensis Tomlin, 1926, NHM(UK) 1926.12.6.6, image courtesy of Yves Terryn, 24 mm long.