Tenagodus, Guettard, 1770

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 86

Tenagodus sp.

Figs 23 AE, 24A

2014 Tenagodus sp. Hansen & Surlyk: 339, fig. 6: 3, tab. 3.

Material. MGUH 33138, MGUH 33139, and 15 external and internal moulds inofficially catalogued by the sample numbers: SH.8.A, SR.729, SR.750.A–B, SR.787.B and D, SR.915.A–B, SR.931.A–B, SR.943, SR.964, SR.985, SR.988, SR.989, SR.1029.A, SR.1073.A–B, SR.1075.A–B and SR.1094.A–B.

Occurrence. Lithified top of the Maastrichtian Tor Formation at Rødvig, Skeldervig, Højerup Church and north of Holtug Quarry, Stevns.

Description. Whorls free, loosely coiled, tubular with narrow, even-sided slit on adapical side, slit width 0.9 mm. Teleoconch surface smooth or covered by relatively fine and weak spiral ribs, ribs becoming weaker on adapical whorl side. Cracks and growth ridges may be present, but unevenly distributed.

Measurements. Large, largest specimen consisting of two whorls, 28 mm high and with an aperture width of 5.6 mm.

Remarks. The preserved part of this species does not reveal any diagnostic features except for the generic characters, but shows a close resemblance to other species of Tenagodus with no spines such as the extant T. obtusus ( Schumacher, 1817) and the Scandinavian middle Danian Tenagodus ornatus ( Lundgren, 1867) . In fact better material may show it to be conspecific with the latter.

Figures

FIGURE 23. A. Arene jakobseni n. sp., Silicone cast of paratype MGUH 33120. Preserved width 8.9 mm. B–E. Ataphrus (Ataphrus) knoesensis n. sp. B–C. Silicone cast of holotype MGUH 33121. Width 4.0 mm. D. Silicone cast of paratype MGUH 33122. Width 4.2 mm. E. Silicone cast of paratype MGUH 33123. Width 3.9 mm. F–H. Cerithium sp. F. Silicone cast of MGUH 33124. Width 10.7 mm. G. Silicone cast of MGUH 33125. Width 9.9 mm. H. Silicone cast of MGUH 33126. Width 10.7 mm. I. Pseudovertagus? sp., Silicone cast of MGUH 33127. Width 1.6 mm. J–K. Striovertagus? sp., Silicone cast of MGUH 33128. Width 2.5 mm. L–O. Cerithidea? sp. L–M. Silicone cast of MGUH 33129. Cast height on figure L 7.4 mm. Cast width on figure M 3.3 mm. N–O. Silicone casts of MGUH 33130. Width 3.7 mm. P–S. Cirsocerithium crassilabris (von Koenen, 1885). P–Q. Silicone casts of MGUH 33131. Width 5.0 mm. R. Lectotype MGUH 865. Upper Palaeocene Lellinge Greensand, Denmark. Height 12.7 mm. Photograph by S. L. Jakobsen. S. Lateral view of MGUH 33132. Upper Palaeocene Lellinge Greensand, Denmark. Width 4.4 mm. T–U. Turritellid genus et sp. indet, Silicone cast of MGUH 33133. Width 1.0 mm. V–W. Turritella cf. plana Binkhorst, 1861. Silicone cast of MGUH 33134. Whorl width at least 17.2 mm. Height of last whorl 17.8 mm. X–Y. Mesalia danica n. sp. X. Silicone cast of holotype MGUH 33135. Width 2.2 mm. Y. Silicone cast of paratype protoconch MGUH 33136. Width 0.7 mm. Z. Mesalia sp., Silicone cast of MGUH 33137. Width 0.6 mm. AE. Tenagodus sp., Silicone cast of MGUH 33138. Width 4.3 mm.