Acteon

Helwerda, Renate A., 2015, Acteonidae, Bullinidae and Ringiculidae (Gastropoda: Heterobranchia) from the Plio-Pleistocene of the Philippines, Zootaxa 3990 (2), pp. 197-220 : 202

Acteon spec 1

( Figures 6–7 )

2008 “ Acteon ” spec 2—Valdés: p. 633, figs. 22B, 23.

Material. Anda4 (2) RGM 961.768, Roxas (1) RGM 961.769, Tiep5 (1) RGM 961.771.

Characterization. Shell small, tall, with flattened convex sides; H 1.97 mm, W 1.22 mm; protoconch slightly elevated, 1.2 whorl, DP 0.65 mm; nucleus small, DN 0.21 mm; teleoconch 1.8 whorl; lower two-thirds of teleoconch whorls sculpted with fine punctuated spiral grooves, becoming stronger towards base; interspaces large, becoming smaller towards base; separate weak punctuated spiral groove develops on upper one-third of first teleoconch whorl; suture weakly channeled with punctuated spiral groove broader than grooves on rest of whorl; aperture narrow; columella with weak single fold; umbilicus very narrow.

Distribution. Philippines, in 155–167 m ( Valdés, 2008).

Figures

FIGURE 1 – 7. 1. Japonacteon sieboldii (Reeve, 1842). RGM 961.831. Locality Anda 4. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. For these and remaining figures, all material derives from the Piazencian or Gelasian of the Santa Cruz Formation of Cabarruyan Island or nearby Luzon Island, Philippines. Scale bars = 1 mm. 2. Japonacteon sieboldii (Reeve, 1842). RGM 961.830. Locality Roxas. (a) apertural view. 3. Japonacteon sieboldii (Reeve, 1842). RGM 961.739. Locality Anda 4. (a) apertural view, (b) apical view. 4. Bathyacteon valdesi nov. spec .. Paratype RGM 961.746. Locality AndaDeVos. (a) apertural view, (b) apical view. 5. Bathyacteon valdesi nov. spec .. Holotype RGM 961.786. Locality AndaDeVos. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 6. Acteon spec 1. RGM 961.768. Locality Anda 4. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 7. Acteon spec 1. RGM 961.741. Locality Anda 4. (a) apertural view, (b) apical view.