Nassa steindachneri Sturany, 1900

Albano, Paolo G., Bakker, Piet A. J., Janssen, Ronald & Eschner, Anita, 2017, An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea gastropods, Zoosystematics and Evolution 93 (1), pp. 45-94 : 63

Nassa steindachneri Sturany, 1900 Figure 15

Nassa steindachneri Sturany, 1900a: 199; redescribed and illustrated in Sturany (1903), pages 222-223, plate II, figures 9a-c.

Type locality.

Station 170, "bei der Insel Noman" [Noman Island, Saudi Arabia], 27°0.2'N, 35°17.6'E, 690 m.

Additional original localities.

Stations 124, 135, 170 and 179 (314 - 690 m) (Red Sea; Table 1 ).

Type material.

Figured syntype: NHMW 84187 (station 179): 1 specimen (figured in Sturany 1903, plate II, figures 9a-c). Further syntypes: NHMW 84186 (station 170) 3 specimens ; NHMW 84185 (station 135): 3 specimens and 1 fragment; NHMW 84188 (station 179): 5 specimens.

Additional material.

NHMW 84184 (station 94): 3 specimens; NHMW 111537 (station 51): 1 specimen.

Original description.

Gehäuse in Gestalt und Windungszahl mit der vorigen Art übereinstimmend, von ihr aber durch die bis zur Mündung herabreichende Cancellierung gut unterschieden. Nur das Embryonalgewinde ist glatt, die übrigen Umgänge sind durch gröbere, etwas gekrümmte Querwülste und zarte Spirallinien regelmäßig gegittert; der oberste Theil der letzten vier Windungen ist überdies von dem übrigen Theile derselben durch eine mit der Naht parallel laufende, tiefer einschneidende Spiralfurche als wulstige Körnchenreihe getrennt. Von den Binden der verwandten Art sind nur noch Spuren sichtbar.

Höhe der Schale 29, Breite 13 mm; Mündung 13 mm hoch und 7 mm breit. - Von den Stationen 124, 135, 170 und 179 vorliegend; in Tiefen bis 690 m gefunden.

Translation.

Shell in shape and number of whorls analogue the previous species, but well differentiated by the cancellated sculpture descending to the mouth. Only the protoconch is smooth, the remaining whorls are regularly gridded by coarser, slightly curved varices and delicate spiral lines; the uppermost part of the last four whorls is also separated from the other parts by an incised spiral channel running parallel to the suture as a thick series of tubercles. Of the colour bands observed in the related species, only traces are here visible.

Shell height 29, width 13 mm; mouth 13 mm high and 7 mm wide. Found in stations 124, 135, 170 and 179; at depths up to 690 m.

Comments.

When a lectotype shall be selected, a specimen should be taken which is better preserved than the specimen figured by Sturany, which has a partly eroded protoconch and early teleoconch whorls. For discussion of relationships see under thaumasia .

Figures

Figure 15. Nassa steindachneri Sturany, 1900, Station 170 (Noman Island, Saudi Arabia, Red Sea). A-C, H. Syntype, NHMW 84186: front (A), right side (B), back (C), protoconch (H). D-F. Syntype, NHMW 84185, Station 135 (Akik Seghir, Eritrea, Red Sea): front (D), right side (E), back (F). G. Original figure by Sturany (1903). I. Original label of syntypes NHMW 84186. Scale bars: A-F: 3 mm, H: 0.2 mm.