Cataegis sp.

Kiel, Steffen, Fernando, Allan Gil S., Magtoto, Clarence Y. & Kase, Tomoki, 2022, Mollusks from Miocene hydrocarbon-seep deposits in the Ilocos-Central Luzon Basin, Luzon Island, Philippines, Acta Palaeontologica Polonica 67 (4), pp. 917-947 : 934-936

Cataegis sp.

Fig. 18D, E .

Material.— One specimen from block F ( NRM Mo 192543) , 2 specimens from block I ( NRM Mo 192665, 192666). Upper Miocene of the “shale quarry” within the Northern Cement Corporation quarry in Pangasinan province, Luzon, Philippines .

Dimensions (in mm).—NRM Mo 192543: H = 11.5, W = 10.0; NRM Mo 192665: W = 13.0, H = 11.6; NRM Mo 192666: W = 10.7, H = 9.5.

Description.—Low turbiniform shell, ca. 3.5 evenly convex whorls bearing four strong, equally spaced spiral keels, lowest ridge forming basal margin, surface of keels with fine nodular ornament; growth increments fine, strongly opisthocline; base with three further keels.

Remarks.—Due to the poor preservation of the available specimens, we are unable to assign Cataegis sp. to any existing or new species. Apart from being slightly lower spired, Cataegis sp. is similar to the extant Cataegis celebesensis McLean and Quinn, 1987 , from Indonesia, which also has nearly evenly spaced spiral ribs; other species of Cataegis tend to have the keels more closely spaced on the whorl’s shoulder and more widely spaced on the flanks McLean and Quinn 1987; Vilvens 2016). This applies also to Cataegis ramosi Kiel, Aguilar, and Kase, 2020a , from late Pliocene-aged Liog-Liog Point seep deposit in Leyte, Philippines, which has a more distinctive shoulder than Cataegis sp. reported here. The Late Miocene Cataegis godineauensis ( Van Winkle, 1919) from seep deposits in Trinidad (see Kiel and Hansen 2015: fig. 14E) has very similar sculpture but a lower spire than Cataegis sp.

The related cataegid Kanoia myronfeinbergi Warén and Rouse, 2016 , has a much more angular whorl profile than the specimens reported here ( Warén and Rouse 2016). Members of the genus Carinotrochus Zhang, Zhang, and Zhang, 2020a , from seamounts in the tropical western Pacific ( Zhang et al. 2020a) are superficially similar to Cataegis sp. but have nearly smooth spiral ridges lacking the nodular sculpture of Cataegis .

Figures

Fig. 18. Limpets, neomphalids, and vetigastropods from Upper Miocene seep deposits of the Amlang Formation in Pangasinan province, Luzon, Philippines. A, B. Unidentified limpet gastropod. A. NRM Mo 192715, small specimen, mostly an internal mold. B. NRM Mo 192656, large specimen with sculpture. C. The neomphalin Retiskenea sp., NRM Mo 192540, apical view on specimen embedded in rock matrix. D, E. The seguenzoid Cataegis sp. D. NRM Mo 192666; note sculpture on D2. E. NRM Mo 192665, specimen showing the strong spiral ribs, in apical (E1) and abapertual (E2) views. F. The colloniid Homalopoma sp., NRM Mo 192583, views on entire shell (F1–F3) and close-up on spiral sculpture (F4).