Emarginula tosaensis Habe, 1953

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 : 189

Emarginula tosaensis Habe, 1953

( Figure 10 )

1953 Emarginula tosaensis nov. spec.—Habe: p. 39.

1999 Emarginula tosaensis Habe, 1953 —Higo et al.: p. 39.

2000 Emarginula tosaensis Habe, 1953 —Sasaki: p. 45, pl. 22, fig. 10.

Material. Anda3 (1) RGM 961.722.

Characterization. Shell patelliform; L 8.97 mm; H 4.07 mm; W 6.23 mm; apex at 0.75 of shell length, not strongly involute; sculpture of about 40 radial ribs, primary and secondary ribs difficult to distinguish, commarginal ribs forming dense knobs on radial ribs; selenizone filled with sediment, demarcated by moderately strong keels; slit well developed; posterior slope slightly concave.

Distribution. Sagami Bay to Western Kyushu, Japan, 50–150 m ( Higo et al. 1999; Sasaki 2000). Also from the Pleistocene of the Moeshima shell bed, Kagoshima Bay, Kyushu, Japan ( Habe 1953).

Remarks. Emarginula dennanti Chapman & Gabriel, 1923 from the Oligocene and Miocene of Australia is quite similar with respect to its shape and radial ribbing, but its commarginal ribs are spaced farther apart. E. souverbiana Pilsbry, 1890 is also similar in its shape and radial ribbing, but its commarginal ribs are weaker and spaced farther apart.

Figures

FIGURES 10 – 12. 10. Emarginula tosaensis Habe, 1953. RGM 961.722. Locality Anda 3. (a) left view, (b) right view, (c) basal view, (d) apical view. 11. Emarginula aff. souverbiana Pilsbry, 1890. RGM 961.723. Locality Anda 6. (a) left view, (b) right view, (c) basal view, (d) apical view. 12. Zeidora geigeri nov. spec. RGM 961.724. Locality Anda 2. (a) left view, (b) right view, (c) basal view, (d) apical view, (e) SEM apical view, (f) SEM detail of protoconch.