Sukashitrochus morleti ( Crosse, 1880 )

Helwerda, Renate A. & Wesselingh, Frank P., 2014, Revision of Scissurellidae, Anatomidae and Fissurellidae (Gastropoda: Vetigastropoda) from the Plio-Pleistocene of the Philippines, Zootaxa 3838 (2), pp. 183-194 : 187

Sukashitrochus morleti ( Crosse, 1880)

( Figures 4–5 )

1880 Schismope morleti nov. spec.—Crosse: p. 144–146, pl. 4, fig. 3.

1982 Sinezona carinata ( A. Adams, 1862) —Ladd: p. 20, pl. 1, figs 3–4.

2012 Sukashitrochus morleti ( Crosse, 1880) —Geiger: p. 632–645, figs 496–503, color plate 4D–E.

Material. Anda2 (1) RGM 961.708, Anda4 (1) RGM 961.709.

Characterization. Shell broad with flattened apex; H 1.03 mm, W 1.29 mm; P with axial sculpture, DN 0.06–0.07 mm; T1 with distinct axial cords; T2 with weaker axial cords, prominent spiral keels and weak spiral cords.

Distribution. Indo-Malayan Archipelago to Central Pacific, 0–60 m depth, live, in muddy sand (Geiger 2012). Also from the Pleistocene of Vanuatu ( Ladd 1982).

Remarks. The studied material conforms to the description by Geiger (2012), although specimen RGM 961.709 only has 14 axial cords on T1 instead of approximately 18.

Figures

FIGURES 1 – 5. 1. Scissurella mirifica (A. Adams, 1862). RGM 961.705. Locality Tiep 3. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. For these and remaining figures, all material derives from the Piacenzian or Gelasian Santa Cruz Formation of Cabarruyan Island or nearby Luzon Island, Philippines. Scale bars shells = 500 µm, scale bars SEM = 100 µm. 2. Sinezona marrowi Geiger, 2012. RGM 961.706. Locality Anda 1. (a) rear view, (b) apertural view, (c) basal view, (d) apical view, (e) SEM detail of teleoconch, (f) SEM detail of protoconch. 3. Sinezona marrowi Geiger, 2012. RGM 961.707. Locality Tiep 2. (a) rear view, (b). 4. Sukashitrochus morleti (Crosse, 1880). RGM 961.708. Locality Anda 2. (a) rear view, (b) apertural view, (c) basal view, (d) apical view, (e) SEM apical view, (f) SEM detail of teleoconch, (g) SEM detail of protoconch. 5. Sukashitrochus morleti (Crosse, 1880). RGM 961.709. Locality Anda 4. (a) SEM detail of teleoconch.