Itieroptygmatis sp. 1

Gruendel, Joachim, Keupp, Helmut, Lang, Fritz & Nuetzel, Alexander, 2022, Late Jurassic (Upper Kimmeridgian) Heterobranchia (Gastropoda) of the coral-facies of Saal near Kelheim and the viciniy of Nattheim (Germany), Zitteliana 96, pp. 179-221 : 179

publication ID

https://dx.doi.org/10.3897/zitteliana.96.e84187

publication LSID

lsid:zoobank.org:pub:35B61908-6E65-48B0-9A17-7281C2253391

persistent identifier

https://treatment.plazi.org/id/6A61FCD6-6332-5C96-A740-4D77082A5F60

treatment provided by

Zitteliana by Pensoft

scientific name

Itieroptygmatis sp. 1
status

 

Itieroptygmatis sp. 1

Plate 18: figs 15, 16 View Plate 18

Material.

Two juvenile specimens from Saal, collection Lang, SNSB-BSPG 2021 XV 88, 89.

Description.

A specimen is 47 mm high. The shell is moderately high-spired and coeloconoid. At least the first six whorls are moderately slender with whorls increasing slowly in width. The sutures are impressed. The whorls are smooth. The last two preserved whorls increase rapidly in width and at the same time, a furrow-like ramp is forming. The whorl face below the ramp is straight and the transition to the moderately convex base is evenly rounded. The base is smooth and has a wide umbilicus. The aperture is not preserved and it is unknown whether it has plaits.

Remarks.

This incompletely preserved species shows the same ontogenetic change in shell shape as I. cylindrata sp. nov. but is distinctly larger.

Relationships.

Itieroptygmatis cylindrata sp. nov. is considerably smaller and more gracile. Phaneroptyxis cf. nogreti sensu Hägele (1997) has whorls that are more regularly increasing in width across the entire shell and lacks a distinct ramp.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Family

Itieriidae