Xylodiscula, Marshall, 1988

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 : 941

Xylodiscula ? sp.

Fig. 20M .

Material.— Four specimens from block B ( NRM Mo 192619–192622) , one specimen from block I ( NRM Mo 192626). Upper Miocene of the “shale quarry” within the Northern Cement Corporation quarry in Pangasinan province, Luzon, Philippines .

Remarks.—These small (up to 2.0 mm diameter), poorly preserved, low-spired shells most closely resemble species of the heterobranch Xylodiscula , but the imperfectly preserved protoconch prevents a more certain assignment. Xylodiscula occurs on sunken wood, both recent ( Marshall 1988) and fossil ( Kiel and Goedert 2007), but is also known from hydrothermal vents ( Warén and Bouchet 1993) and other reducing environments ( Høisaeter and Johannessen 2001; Hawe et al. 2014).

Figures

Fig.20.Caenogastropoda and Opisthobranchia from Upper Miocene seep deposits of theAmlang Formation in Pangasinan province, Luzon, Philippines. A. Naticidae gen. et sp. indet., NRM Mo 192628, imperfect specimen in apical and apertural views. B, C. Very large Fusinus? sp., imperfect specimens in abapertural view. B. NRM Mo 192662. C. NRM Mo 192663. D–F. Enigmaticolus semisulcata (Martin, 1933), imperfect specimens in apertural and abapertural views. D. NRM Mo 192632. E. NRM Mo 192586. F. NRM Mo 192633. G. Enigmaticolus sp., NRM Mo 192640, specimen with broken apertural base, abapertural and apertural view. H. Mitridae gen. et sp. indet., NRM Mo 192639, imperfect specimen, abapertural view. I. Terebridae gen. et sp. indet., NRM Mo 192627, fragment of spire, lateral view. J, K. Acanthodaphne? sp., imperfect specimens in apertural view. J. NRM Mo 192637. K. NRM Mo 192638. L. Gemmula sp., NRM Mo 192417, imperfect specimen, apertural view. M. Xylodiscula? sp., NRM Mo 192619, specimen embedded in rock matrix in apical view. N. Volvulella aff. minoensis Itoigawa, 1958, NRM Mo 192641, nearly complete specimen, apertural view. O. Ringiculidae gen. et sp. indet., NRM Mo 192642, imperfect specimen, apertural view.