Mohrensternia angulata ( Eichwald, 1853 )
publication ID |
https://doi.org/ 10.5281/zenodo.13272499 |
persistent identifier |
https://treatment.plazi.org/id/0386436B-FFE5-FFA3-FCCA-FCB7C19FFDAE |
treatment provided by |
Felipe |
scientific name |
Mohrensternia angulata ( Eichwald, 1853 ) |
status |
|
Mohrensternia angulata ( Eichwald, 1853) View in CoL
Fig. 9A, B View Fig .
Rissoa angulata View in CoL sp. nov.; Eichwald 1853: 268–269, pl. 10: 10.
Rissoaangulata Eichwald; Hörnes 1856: 577–578 (partim), pl. 48: 23 a.
Mohrensterniaangulata (Eichwald); Friedberg 1923: 392, pl. 23: 15, 16.
Mohrensternia angulata (Eichwald) View in CoL ; Jekelius 1944: 71, pl. 15: 7, 8.
Mohrensternia angulata (Eichwald) View in CoL ; Papp 1954: 35–36, pl. 5: 27.
Rissoa (Mohrensternia) angulata angulata Eichwald View in CoL ; Boda 1959: 707, pl. 24: 12–16.
Mohrensternia angulata (Eichwald) View in CoL ; Svagrovský 1971: 294–296, pl. 46: 1–9.
Material.— Thirteen specimens from the Early Sarmatian of
Lednicé (formerly Eisgrub) E of Mikulov, Czech Republic,
NHMW 2002z0029/0001.
Description.—The slender shell comprises up to 7 rounded whorls measuring up to 6 mm in height and up to 2.5 mm in width. Whorls slowly increase, separated by incised sutures. Sculpture consists of 10 broad orthocline to slightly opisthocyrt axial ribs whose intensity may decrease in the course of the last whorl. Slender morphs with regularly curving ribs exist alongside those with ribs increasing in thickness in the mid to abapical portion of the whorls. The last whorl forms 50–60% of total shell height. The holostomatous aperture is broad oval to rounded and is characterised by a very thin peristome.
The protoconch has 2.25–2.3 rounded whorls, which appear to be smooth. It measures 0.35–0.36 mm both in maximum diameter and in height. The first whorl measures 0.14–0.15 mm in maximum diameter and 0.03–0.04 mm in the width of the initial cap−like onset. The transition to the teleoconch is indistinct. The onset of the teleoconch is indicated by the formation of wavy axial folds which grade into axial ribs.
Remarks.—The dimension of the protoconch indicates an indirect development with inclusion of a free veliger stage. The veliger spent a brief period of probably one or two weeks within the plankton, feeding on phytoplankton.
Mohrensternia angulata View in CoL is a typical and widespread species during the Early Sarmatian of the Vienna Basin and the Styrian Basin and is also known from Sarmatian deposits of the Mid Danube Basin ( Jekelius 1944), the Carpathian Foredeep ( Friedberg 1923), Slovakia ( Svagrovský 1971), and South−East Europe, e.g., Bulgaria and Romania ( Kolesnikov 1935; Iljina 1998). Svagrovský (1971) noted a certain variability of the shell, with more or less slender outline and variable strength of the axial ribs; this was confirmed by the investigation of our material. Its roots reach back to the Badenian, when it is a rare element throughout the Central Paratethys, documented from Hungary, Poland, and Romania ( Csepreghy−Meznerics 1950; Kokay 1966; Friedberg 1923).
NHMW |
Naturhistorisches Museum, Wien |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
Kingdom |
|
Phylum |
|
Class |
|
Order |
|
Family |
|
Genus |
Mohrensternia angulata ( Eichwald, 1853 )
Kowalke, Thorsten & Harzhauser, Mathias 2004 |
Mohrensternia angulata (Eichwald)
Svagrovsky, J. 1971: 294 |
Rissoa (Mohrensternia) angulata angulata
Boda, J. 1959: 707 |
Mohrensternia angulata (Eichwald)
Papp, A. 1954: 35 |
Mohrensternia angulata (Eichwald)
Jekelius, E. 1944: 71 |
Rissoa angulata
Eichwald, E. 1853: 268 |