Hokkaidoconcha occidentalis ( Stanton, 1895 )

Kaim, Andrzej, Jenkins, Robert G., Tanabe, Kazushige & Kiel, Steffen, 2014, Mollusks from late Mesozoic seep deposits, chiefly in California, Zootaxa 3861 (5), pp. 401-440 : 414

Hokkaidoconcha occidentalis ( Stanton, 1895)

( Fig. 6 F)

Material and occurrence. Single specimen (GZG.INV.84981) from Paskenta (Tithonian, Late Jurassic).

Remarks. A newly found, well-preserved specimen of this species with four whorls ( Fig. 6 F) shows the dominance of axial over spiral ornamentation. The specimen is 10.35 mm high and 3.8 mm wide.

Figures

FIGURE 6. A – E. Abyssomelania cramptoni sp. nov. from Campanian (Late Cretaceous) seep carbonates at Waipira III, New Zealand. A. Paratype (GNS TM 8851). B. Paratype (GNS TM 8850), C. Paratype (GNS TM 8853). D. Holotype (GNS TM 8852), the arrow indicates the abyssomelanid riblet. E. Juvenile (GNS TM 8927). F. Hokkaidoconcha occidentalis (Stanton, 1895) from Tithonian (Late Jurassic) seep carbonates at Paskenta, Tehama County, California, USA; GZG. INV. 84981. G – N. Abyssomelania campbellae sp. nov. from Albian (Early Cretaceous) seep carbonates at Cold Fork of Cottonwood Creek, Tehama County, California, USA. G – H. Paratype (GZG. INV. 84983). I-K. Holotype (GZG. INV. 84982). L – M. Paratype (GZG. INV. 84984). N. Paratype (GZG. INV. 84985).