Mathilda malvinarum
Creators
Description
Mathilda malvinarum (Melvill & Standen, 1907)
Fig. 5D
Cerithiopsis malvinarum Melvill & Standen, 1907: 135, figs. 6, 6a; Strebel, 1908: 49, pl. 1, figs. 10a–c
Mathilda malvinarum — Powell, 1951: 113
Examined material. 10 sh. (MACN-In 40700).
Description. Shell height to 2.8 mm (up to 4 mm according to Melvill & Standen 1907); turritelliform, moderately solid. Protoconch large, of 1 markedly convex whorl; sculptured with 4 low, wide spiral cords. Teleoconch of up to 5.75 whorls, markedly convex in outline; last whorl comprising about 45% of total shell height. Suture impressed. Surface pale brownish, clearer at spiral sculpture; sculptured with 25 to 30 axial ribs per whorl and 4 spiral cords, the 2 adapical being stronger. Base delimited by a strong cord and sculptured with up to 9 additional, narrower cords. Aperture almost rounded, somewhat projected anteriorly, interior brownish with lighter margin; columellar callus narrow, slightly reflected.
Remarks. The original figure by Melvill & Standen (1907) only shows 2 spiral cords per whorl. However, Strebel (1908), who studied the same specimens, figured four spiral cords per whorl, a condition similar to that found in the material here examined.
Notes
Files
Files
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System files
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Mathildidae
- Genus
- Mathilda
- Kingdom
- Animalia
- Order
- Heterostropha
- Phylum
- Mollusca
- Scientific name authorship
- Melvill & Standen
- Species
- malvinarum
- Taxon rank
- species
- Taxonomic concept label
- Mathilda malvinarum (Melvill, 1907) sec. Luca & Zelaya, 2019
References
- Melvill, J. C. & Standen, R. (1907) The marine Mollusca of the Scottish National Antarctic Expedition. Transactions of the Royal Society of Edinburgh, 46, 119 - 157, 1 pl.
- Strebel, H. (1908) Die Gastropoden (mit Ausnahme de nackten Opisthobranchier). Wissenschaftliche Ergebnisse der Schwedischen Sudpolar-Expedition 1901 - 1903, 6 (1), 1 - 112, pls. 1 - 6.
- Powell, A. W. B. (1951) Antarctic and Subantarctic Mollusca: Pelecypoda and Gastropoda collected by the ships of the Discovery Committee during the years 1926 - 1937. Discovery Reports, 26, 49 - 196, pls. 5 - 10.