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Leptaena (Leptaena) depressa

Strophomenata - Strophomenida - Rafinesquinidae

Taxonomy
Producta depressa was named by Sowerby (1824) ["Neotype" designated by Kelly (1967), redesignated as lectotype by Bassett & Cocks (1974). (It is from Sowerby's collection, after all.) = Strophomena rhomboidalis (Wilckens); Davidson 1871, pl. 39, figs. 3, 5, 12, 14 only.]. Its type specimen is NHM B60649 and is a 3D body fossil. Its type locality is Dudley, Wenlock Limestone, which is in a Homerian marine horizon in the Wenlock Limestone Formation of the United Kingdom.

It was recombined as Leptaena depressa by Kelly (1967), Cocks (1968), Bassett and Cocks (1974) and Hoel (2005); it was recombined as Leptaena (Leptaena) depressa by Rubel (2011).

Synonyms
Synonymy list
YearName and author
1824Producta depressa Sowerby p. 86 figs. pl. 459, fig. 3.
1825Producta depressa Sowerby p. 86 figs. pl. 459, fig. 3.
1966Rugoleptaena venzavensis Rybnikova p. 76
1967Leptaena depressa Kelly pp. 595 - 597 figs. Plate 98, figs. 4-9
1968Leptaena depressa Cocks p. 300
1974Leptaena depressa Bassett and Cocks p. 14
2005Leptaena depressa Hoel pp. 271 - 272 figs. 4, 10, 11D
2011Leptaena (Leptaena) depressa Rubel

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
RankNameAuthor
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyRafinesquinidaeSchuchert 1893
subfamilyLeptaeninaeHall and Clarke 1894
genusLeptaenaDalman 1828
subgenusLeptaenaDalman 1828
speciesdepressa(Sowerby 1824)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
F. B. Kelly 1967Semi-circular to quadrate or rhomboid, having radial costellae with small interspaces and rugae not coarsely developed. Foramen small, often cicatrized; pseudodeltidium small covering only umbonal part of delthyrium. Ventral valve depressed immediately inside line of geniculation. Ventral muscle scar large, widely cordate. Adductors anteriorly elevated, shorter than diductors.
O. A. Hoel 2005Species of Leptaena with large number of regular rugae and small alae. Chilidium massive, pseudodeltidium very small. Inner surface usually strongly tuberculate. Cardinal process lobes relatively very small and parallel. Teeth strong, sockets shallow. See also KELLY (1967: 595).