Sinetectula nigricostata ( Reeve, 1846 ) 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 : 170

Sinetectula nigricostata ( Reeve, 1846) gen. et comb. nov.

Figs 7 , 10R

Buccinum nigricostatum Reeve, 1846 : [1], pl. 10 fig. 73 (see Fig. 10R ) (type (s) not traced).

Parviphos nigricostatus – Watters 2009: 266.

Type locality

“ Panama (under stones at low water)”.

Material examined

PANAMA • 2 lv; Gulf of Chiriqui, off Canal of Afuera; depth 70–80 m; 1989; KF 0533 • 1 lv; Gobernadora Island , at low tide; KF 3378 (see Fig. 7A–D ) .

Distribution

Sinetectula nigricostata gen. et comb. nov. is restricted to the central eastern Pacific. Known from Panama.

Remarks

Sinetectula nigricostata gen. et comb. nov. is charactarised by the convex whorls and fine spiral sculpture in combination with a peculiar pattern consisting of well-defined spiral lines. S. nigricostata gen. et comb. nov. is the only member of the genus that shares with S. cinis gen. et comb. nov. the presence of a labral denticle (see Fig. 7D ). The labral denticle is usually situated at the 7 th (vs 8 th in S. cinis gen. et comb. nov.) spiral interspace. Depending on the strength of the secondary spiral cords, the first interspace may be counted double in the case that it is divided by a secondary spiral cord that has become as strong as the primary spiral cords, thus with the labral denticle appearing in the 8 th interspace.

Sinetectula cinis gen. et comb. nov. differs from S. nigricostata gen. et comb. nov. in its laterally more flattened spire (instead of convex whorls), the broader spiral cords, the weaker axial ribs that are higher in number, the stretched base (instead of constricted) with a shorter siphonal canal, a less defined pattern of lines, and the slightly larger adult size.

Figures

Fig. 7A–D. Sinetectula nigricostata (Reeve, 1846) gen. et comb. nov., Panama, Gobernadora, low tide, 19.6 mm long (KF 3378). Scale bar: 5 mm.

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.