Mohrensternia banatica ( Jekelius, 1944 )

Kowalke, Thorsten & Harzhauser, Mathias, 2004, Early ontogeny and palaeoecology of the Mid-Miocene rissoid gastropods of the Central Paratethys, Acta Palaeontologica Polonica 49 (1), pp. 111-134 : 126

publication ID

https://doi.org/ 10.5281/zenodo.13272499

persistent identifier

https://treatment.plazi.org/id/0386436B-FFE4-FFA3-FF80-FDF0C60AFE95

treatment provided by

Felipe

scientific name

Mohrensternia banatica ( Jekelius, 1944 )
status

 

Mohrensternia banatica ( Jekelius, 1944) View in CoL

Fig. 9C View Fig .

Mohrensternia pseudoangulata banatica View in CoL var. nov.; Jekelius 1944: 72, pl. 15: 16–18.

Mohrensternia banatica (Jekelius) View in CoL ; Papp 1954: 36–37, pl. 5: 30–33.

Mohrensternia banatica (Jekelius) View in CoL ; Svagrovský 1971: 301–303, pl. 49: 1–12.

Material.— Four specimens from the Early Sarmatian of Eichkogel / Mödling, Austria (Vienna Basin ), NHMW 2002 View Materials z 0029/0002.

Description.—The small, high−spired shell comprising up to seven regularly increasing whorls measures up to 4 mm in height and up to 1.5 mm in width. The rounded whorls are separated by moderately deep sutures. Whorls are sculptured by 14 delicate, closely spaced, slightly wavy to sickle−shaped axial ribs, which regularly curve in the course of the whorls’ flanks. Weaker spiral sculpture is more or less developed. The last whorl forms about 40% of total shell height. The holostomatous aperture is rounded to oval. It is characterised by a thin peristome.

The low conical protoconch comprises 2.25 rounded whorls measuring 0.36–0.37 mm both in height and in maximum diameter. The apparently smooth embryonic shell comprises one whorl, measuring 0.14–0.15 mm in maximum diameter and 0.03 mm in the width of the initial cap. It is well separated from the larval shell by a marked incision and a subsequent thickened rim. The larval shell is smooth and is terminated by a slightly thickened rim.

Remarks.—The protoconch indicates an indirect development with inclusion of a free planktonic larval stage. Size and dimensions of the protoconch closely resemble those of Mohrensternia angulata . Mohrensternia banatica differs, however, by a distinct demarcation of the embryonic shell from the subsequent larval shell with an incision and a thickened rim, indicating the thickened apertural margin of the hatchling. The transition from the larval shell to the teleoconch is sharp in the case of M. banatica , indicated by a rim of the aperture of the pediveliger ready for metamorphosis and the abrupt onset of the adult sculpture, whereas in M. angulata this transition is indistinct.

According to Papp (1954) this species was also found in the Early Sarmatian of the drilling St. Marx in the Vienna Basin. Svagrovský (1971) mentioned its occurrence in the Sarmatian of Slovakia, but remarked its absence from the Pannonian Basin, the Carpathian Foredeep, and from the Sarmatian of South−East Europe, whereas Iljina (1998) mentioned it from the Early Sarmatian of Hungary.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Rissoidae

Genus

Mohrensternia

Loc

Mohrensternia banatica ( Jekelius, 1944 )

Kowalke, Thorsten & Harzhauser, Mathias 2004
2004
Loc

Mohrensternia banatica (Jekelius)

Svagrovsky, J. 1971: 301
1971
Loc

Mohrensternia banatica (Jekelius)

Papp, A. 1954: 36
1954
Loc

Mohrensternia pseudoangulata banatica

Jekelius, E. 1944: 72
1944
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