Manzonia (Alvinia) partschi ( Hörnes, 1856 )

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 : 124-125

publication ID

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

persistent identifier

https://treatment.plazi.org/id/0386436B-FFE6-FFA2-FCCA-F90EC109FA8F

treatment provided by

Felipe

scientific name

Manzonia (Alvinia) partschi ( Hörnes, 1856 )
status

 

Manzonia (Alvinia) partschi ( Hörnes, 1856)

Fig. 8B View Fig .

Rissoa partschi View in CoL sp. nov.; Hörnes 1856: 573–574, pl. 48: 19 a, b.

Manzonia partschi (Hörnes) ; Meznerics 1933: 332.

Rissoa (Manzonia) partschi (Hörnes) View in CoL ; Strausz 1966: 77, pl. 46: 23.

Alvania (Manzonia) partschi (Hörnes) View in CoL ; Bohn−Havas 1973: 1038, pl. 3: 8.

Alvania (Taramellia) partschi (Hoernes) View in CoL ; Gürs and Weinbrecht 2001: 82, fig. 2.10, pl. 1: 11.

Material.— Fourteen specimens from the Badenian of Baden / Sooss , Lower Austria, NHMW 2002 View Materials z0030/0017.

Description.—The slender, conical shell comprises 6 rounded whorls measuring up to 5 mm in height. The last whorl forms about 60% of total shell height. Sculpture consists of 20 weak, straight to slightly opisthocyrt axial ribs, which are crossed by 4 about equally strong spiral keels forming a very regular reticulate pattern. The points of intersection of axial and spiral sculptural elements are thickened. Nodes to very short spines are formed. The base is sculptured by two prominent spiral keels. The large, rounded, egg−shaped, holostomatous aperture is characterised by a circular pad.

The protoconch has 2.5 slightly rounded whorls measuring 0.41–0.43 mm in height and 0.39–0.43 mm in maximum diameter. The embryonic shell comprises nearly one inflated whorl measuring 0.06–0.07 mm in the width of the initial cap and 0.15–0.16 mm in maximum diameter. It is strongly sculptured by 7 spiral threads connected by weak short axial threads. The embryonic shell is terminated by a slightly sinuous rim. The subsequent larval shell is sculptured by 8 spiral threads which may be disconnected, building rows of elongated nodes. The rows are strongest developed in the median portion of the whorls. The protoconch is terminated by a short, slightly thickened sinusigera notch.

Remarks.—The protoconch points to indirect development including a free planktotrophic larval stage. Manzonia (Alvinia) partschi differs from M. (A.) miocrassicosta by its larger, slen− der, less thickened shell and by its weaker−developed sculpture of more but delicate axial ribs. The protoconch differs by its considerably larger size and stronger−developed embryonic and larval sculpture. M. (A.) partschi is very similar to the type species but differs by its slightly weaker sculpture and by its indirect mode of early ontogenetic development. M. (A.) partschi is a rather rare species which is known in the Central Paratethys from Hungary, Austria, and Romania. Janssen (1984) and Gürs and Weinbrecht (2001) described this species from the Miocene of the North Sea Basin.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Rissoidae

Genus

Manzonia

Loc

Manzonia (Alvinia) partschi ( Hörnes, 1856 )

Kowalke, Thorsten & Harzhauser, Mathias 2004
2004
Loc

Alvania (Taramellia) partschi (Hoernes)

Gurs, K. & Weinbrecht, F. 2001: 82
2001
Loc

Alvania (Manzonia) partschi (Hörnes)

Bohn-Havas, M. 1973: 1038
1973
Loc

Rissoa (Manzonia) partschi (Hörnes)

Strausz, L. 1966: 77
1966
Loc

Manzonia partschi (Hörnes)

Meznerics, I. 1933: 332
1933
Loc

Rissoa partschi

Hornes, M. 1856: 573
1856
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