Scissurella mirifica ( Adams, 1862 )

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 : 184-186

Scissurella mirifica ( Adams, 1862)

( Figure 1 )

1862 Anatomus mirificus nov. spec.—Adams, p. 348.

1966 Scissurella declinans Watson, 1886 —Ladd, p. 12, 26–27, pl. 2, fig. 6. 2012 Scissurella mirifica ( Adams, 1862) —Geiger: p. 235–251, figs 133–139, color plate 3D.

Material. Tiep3 (1) RGM 961.705.

Characterization. Shell with flattened apex and inflated base; H 0.90 mm, W 1.26 mm; P with axial sculpture, DN 0.04 mm; T2 with fine sculpture; spiral and axial cords equal in strength, axial cords prosocline; aperture large, inclined.

Distribution. Indo-Malayan Archipelago to Central Pacific, 0–6 m depth live, in algae and coral rubble of reefs (Geiger 2012). Also known from the “Upper Miocene” of the Bikini Atoll ( Ladd 1966).

Remarks. The studied material conforms to the description by Geiger (2012), although some of the characters, especially on T1, are obscured by sediment and the protoconch is corroded.

Type species. Schismope brevis Hedley, 1904 (by original designation); late Pleistocene–Recent, New Zealand.

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.