Thylacodes, Guettard, 1770

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 108

publication ID

https://doi.org/ 10.11646/zootaxa.4654.1.1

publication LSID

lsid:zoobank.org:pub:CFD82CC0-3110-472E-972B-7ADC0C523A04

DOI

https://doi.org/10.5281/zenodo.5582856

persistent identifier

https://treatment.plazi.org/id/BF18F633-A96B-FF8E-2B9C-C446FD0DF8A1

treatment provided by

Plazi

scientific name

Thylacodes
status

 

Thylacodes View in CoL ? sp.

Figs 27 View FIGURE 27 K–M

Material. Specimen MGUH 33191 is a fragmentary 2.4 mm wide external mould.

Occurrence. Thylacodes ? sp. was collected from the top of the Maastrichtian Tor Formation at Holtug Quarry, Stevns Klint.

Description. Shell low turbiniform, sinistral with flattened apex seemingly attached to a slender bryozoan branch. Protoconch heterostrophic, consisting of two whorls on which no microsculpture can be observed. Teleoconch whorls expanding slowly, flattened on adapical side, becoming more convex on lateral and abapical side. Adapical side of whorls with strong transverse ribs curving from the adapical suture and backwards into an initially indistinct, but progressively deeper sinus situated halfway between sutures; transverse ribs continue forward and down to the periphery of the last whorl, where they are replaced rather abruptly by seven moderately coarse spiral ribs. Transverse rib number per half-whorl approximating 15 on third whorl.

Remarks. Thylacodes ? sp. differs from T. contendis n. sp. described above by the sinistral coiling and a coarser transverse ribbing. This may though just reflect ecophenetic differences within the species; especially as only a single specimen is known of the present taxon.

MGUH

Museum Geologicum Universitatis Hafniensis

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