Popis
Autor: Jan Delsing
Text ID: 93267
Text Type: 1
Page: 0
Založeno: 22.04.2019 20:13:42 - Uživatel Delsing Jan
Language: EN
Odkazová funkce: [[t:1330167,textblock=93267,elang=EN;Popis]]
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.
Albano, P. & Bakker, P.A.J., 2016, Annotated catalogue of the types of Triphoridae (Mollusca, Gastropoda) in the Museum für Naturkunde, Berlin, with lectotype designations