Mathilda clara Boettger, 1902

Harzhauser, Mathias & Landau, Bernard, 2023, The Architectonicidae and Mathildidae (Gastropoda, Heterobranchia) of the Miocene Paratethys Sea-victims of the Miocene Climatic Transition, Zootaxa 5370 (1), pp. 1-74 : 48-49

publication ID

https://doi.org/ 10.11646/zootaxa.5370.1.1

publication LSID

lsid:zoobank.org:pub:48903495-7C6C-46E4-9B1B-D6A2F2781873

DOI

https://doi.org/10.5281/zenodo.10580818

persistent identifier

https://treatment.plazi.org/id/03BEE17B-FFEE-C054-FF0E-FCEC7F163464

treatment provided by

Plazi

scientific name

Mathilda clara Boettger, 1902
status

 

Mathilda clara Boettger, 1902 View in CoL

Figs 24A View FIGURE 24 1 –A View FIGURE 1 2 View FIGURE 2

* Mathilda clara View in CoL n. sp. — Boettger 1902: 155.

Mathilda clara Bttgr. —Boettger 1907: 168.

Mathilda clara Boettger View in CoL — Cossmann 1912: 10.

Mathilda clara Boettger —Zilch 1934: 217, pl. 7, figs 11–12.

Mathilda clara Boettger, 1901 View in CoL — Bałuk 1975: 114, pl. 13, fig. 9.

Type material. Lectotype (designated by Zilch 1934: 217): SMF 372692 About SMF (XII 2492a), SL: 2.9 mm, MD: 1.8 mm, Senckenberg Museum, Frankfurt/Main, Germany, Coşteiu de Sus ( Romania), illustrated in Zilch (1934: pl. 7, fig. 11), Figs 24A View FIGURE 24 1 –A View FIGURE 1 2 View FIGURE 2 .

Additional material. SMF XII 2492b, Senckenberg Museum, Frankfurt/Main, Germany, Coşteiu de Sus ( Romania), illustrated in Zilch (1934: pl. 7, fig. 12) .

Revised description. Small, robust, stout conical shell; apical angle 35°. Protoconch multispiral, of about three smooth whorls, heterostrophic, deeply immersed in first teleoconch whorl, nucleus not exposed, tilted at angle of about 140°. Teleoconch of three angulated whorls separated by indistinct suture. Sculpture of three prominent spiral cords: S1 weakest, recessed; S2 most prominent, placed slightly above mid-whorl, forming slight keel at periphery; S3 slightly weaker than S2. Faint secondary spiral thread appears between S1 and S2 on concave sutural ramp on second teleoconch whorl. Fourth spiral cord at suture partially covered by subsequent whorl. Axial sculpture of 17 relatively broad, wide-spaced ribs forming cancellate pattern with spiral cords on the first two whorls, with large tubercles developed at intersections. Base rapidly contracting, flattened, with two weak peribasal spiral cords. Umbilicus reduced to narrow chink, but clearly delimited by low periumbilical cord. Aperture moderately large and wide, subpentagonal. Columella straight, tilted slightly to left. Columellar callus forming narrow rim. No parietal callus. Outer lip thin, crenulated.

Discussion. This species could be mistaken for a juvenile Mathilda praeclara Boettger, 1902 but is distinguished at the same growth stage by its distinctly wider spaced ribs, the much coarser tubercles developed at the sculptural intersections, and the surface on the last two whorls is less densely and sharply cancellate. The specimen from Korytnica ( Poland), described by Bałuk (1975), consists only of the protoconch and parts of the first teleoconch whorl but corresponds well to the type of M. clara .

Paleoenvironment. Unknown; probably middle to outer neritic.

Distribution. Only known from the Langhian equivalent of the Badenian in the Central Paratethys Sea.

Central Paratethys Sea. Badenian (Middle Miocene): Korytnica Basin: Korytnica ( Poland) ( Bałuk 2006); Făget Basin: Coşteiu de Sus ( Romania) ( Boettger 1902).

SMF

Forschungsinstitut und Natur-Museum Senckenberg

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Mathildidae

Genus

Mathilda

Loc

Mathilda clara Boettger, 1902

Harzhauser, Mathias & Landau, Bernard 2023
2023
Loc

Mathilda clara

Baluk, W. 1975: 114
1975
Loc

Mathilda clara

Cossmann M. 1912: 10
1912
Loc

Mathilda clara

Boettger, O. 1902: 155
1902
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