Triforis picturatus G.B. Sowerby III, 1901

Albano, Paolo G., Bakker, Piet A. J. & Sabelli, Bruno, 2019, Annotated catalogue of the types of Triphoridae (Mollusca, Gastropoda) in the Natural History Museum of the United Kingdom, London, Zoosystematics and Evolution 95 (1), pp. 161-308 : 161

Triforis picturatus G.B. Sowerby III, 1901

Figure 96

Triforis picturatus G.B. Sowerby III 1901: 210, pl. 22, fig. 11.

Type locality.

Cebu, Philippines.

Type material.

Syntypes: NHMUK 1901.10.3.89-90: 2 specimens, Cebu Island, Philippines .

Original description.

Testa sinistrorsa, elongata, gracilis, albida, nigro-fusco maculata, ad apicem fusca; anfr. 18, planati, vix concavi, liris tribus acutiusculis cincti, inferne angulati ad angulum pustulati, pustulis albidis fusco interpunctatis; anfractus ultimus breviculus, biangulatus, ad basim vix concavus, rostro fusco oblique dextrorsus reflexo instructus; apertura parva, subquadrata; labrum tenue, serratum. Long. 9, diam. 2.5 mm.

A pretty species, neatly sculptured and nodule, streaked and spotted with blackish brown; with a brown tubular rostrum placed obliquely away from the aperture, on the right hand side of the shell.

Translation of the Latin text.

Elongate sinistral slender shell, white with blackish-brown spots and dark apex; 18 flat, barely concave whorls with three sharp spiral lirae, angulated and pustulated anteriorly with alternating dark-brown and white pustules; last whorl short, biangulated, barely concave, dark siphonal canal placed obliquely right from aperture; small subquadrate aperture; light serrated external lip. Length 9, diameter 2.5 mm.

Diagnosis.

Syntypes 7.6 and 9.4 mm high. Conical shell with flat whorls. Teleoconch of 12 whorls with three spiral narrow cords that bear oblong tubercles in the first whorls. Such tubercles soon become a continuous weakly ondulated spiral cord. A fourth smooth cord is barely visible suprasuturally. Between the main cords, many fine spiral and axial threads are visible. Peristome rebuilt after breakage in one syntype and incomplete in the other but it apparently bears additional spiral cords and a shallow posterior sinus. Base with two additional undulate spiral cords and foliaceous axial riblets. Siphonal canal large and moderately long. Protoconch missing. Teleoconch brown with white blotches and tubercles. Base brown. Operculum horny, thin, ovate, paucispiral of about 2 whorls, nucleus a little eccentric, periphery thinner and only very little upturned.

Remarks.

Syntype NHMUK 1901.10.3.89 was collected live and contains the dried animal inside. The operculum was extracted and photographed .

Figures

Figure 96. Triforis picturatus G. B. Sowerby III, 1901, Cebu Island, Philippines. A-E, G, L, M Syntype NHMUK 1901.10.3.89: front (A, B), side (C, D), back (E), operculum (G), peristome (L), aperture (M). F Original labels. H Original figure. I-K Syntype NHMUK 1901.10.3.90: front (I), side (J), back (K). Scale bars: A-E, I-K: 1 mm; G: 0.2 mm; L, M: 0.5 mm.