Triphora dilecta Thiele, 1925

Albano, Paolo G. & Bakker, Piet A. J., 2016, Annotated catalogue of the types of Triphoridae (Mollusca, Gastropoda) in the Museum fuer Naturkunde, Berlin, with lectotype designations, Zoosystematics and Evolution 92 (1), pp. 33-78 : 38

Taxon classification Animalia Caenogastropoda Triphoridae

Triphora dilecta Thiele, 1925 Figure 6

Triphora dilecta Thiele, 1925: 126 (92), plate XXII (X), figure 12.

Type specimens.

Lectotype: ZMB/Moll no. 109263a, here designated. Paralectotypes A-C: ZMB/Moll no. 109263b-d.

Type locality.

"Station 95 (34°51 ’Südl. Br., 19°37,8' östl. L., 80 m Tiefe, bei Cap Agulhas)" (South Africa).

Original description.

Von Station 95 (34°51' südl. Br., 19°37,8' östl. L., 80 m Tiefe, bei Cap Agulhas) liegen 4 meistens schlecht erhaltene Schalen vor, deren beste ich abbilde. Die Art, der ich den obigen Namen gebe, ist durch ihre schlanke, gerade Form und ihre geringe Skulptur sehr ausgezeichnet. Die Schal ist weiß, glatt und glänzend, hoch getürmt und schmal; die gezeichnete Schale zeigt 12 Windungen, von denen die erste ziemlich groß, glatt und rundlich ist, während die folgenden nur 2 Spiralfurchen aufweisen, deren eine feinere dicht über der Naht verläuft, während die andere etwas darüber gelegen und merklich breiter ist, die obere Hälfte zeigt nur eine leichte Einschnürung infolge des etwas wulstigen oberen Randes. Auch die letzte Windung hat weiter keine Skulptur, die Spindel ist gerade und ziemlich lang, die vielleicht noch unfertige Mündung einfach rautenförmig mit kurzer Rinne. Höhe 6 mm, Durchmesser 1,4 mm.

Translation.

From station 95 (34°51'S, 19°37.8'E, 80 m depth, near Cape Agulhas) there are four poorly preserved shells, of which I figure the best. The species, to which I give a name here, is very slender, the very straight shape and the fine sculpture are very typical. The shell is white, smooth and shiny, high and slender; the figured shell has 12 whorls, of which the first is quite large, smooth and rounded, while the following whorls have two spiral grooves, a finer groove is visible just above the suture, while the other is located higher on the whorl and much wider, the upper part of the shell shows a slight constriction [because the protoconch whorls are larger than the first teleoconch whorl]. Also the last whorl has not any other sculpture, the siphonal canal is straight and quite long, and the probably undeveloped aperture is diamond-shaped with a short canal. Height 6 mm, diameter 1.4 mm.

Diagnosis.

Lectotype height 6.3 mm. Shell very slender, conical, with flat whorls. Teleoconch of nine whorls, which have three flat broad spiral cords; the first two become a single broader one towards the last whorl. A fine suprasutural smooth cord is also present. The base is smooth. The peristome without any specific ornamentation, lip very thin (it may not be fully developed in the lectotype, although the base is fully developed, thus the specimen is adult). Paucispiral large apex of three whorls; the first whorl is smooth, while the other two bear a strong keel. Colour white.

Remarks.

This species is remarkable because of the lack of tubercles, which are present in most triphorids.