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Leptaena sperion

Strophomenata - Strophomenida - Rafinesquinidae

Taxonomy
Leptaena sperion was named by Bassett (1977) [= Leptaena rhomboidalis Barrande 1879. pl. 41 figs. 28, 33 (non pl. 41 figs. 1-27, 29-32, 34-38). = Leptaena rhomboidalis Holtedahl 191670, pl. 12 figs. 1--2, 5, 8--10, (11 ?), 12 (non BASSETT 1977). = Leptaena depressa vulgaris -- Havlicek 1967: 93, pl. 15 figs. 1, 2, 4, 5, 10, 11 (non pl. 15 figs. 8, 9, pl. 16 figs. 10, 12). = Leptaena depressa vulgaris -- Havlicek & Storch 1990: 72, pl. 12 figs. la, b, 2a, b, 6-8 (non pl. 12 figs. 3-5, 9, 10, text-fig. 9).]. Its type specimen is BGS GSM.12683, a valve (ventral valve), and it is a 3D body fossil. Its type locality is Woolhope, which is in a Sheinwoodian deep subtidal shelf limestone/shale in the Woolhope Limestone Formation of the United Kingdom.

Sister species lacking formal opinion data
L. dicax, L. ingrica

Synonymy list
YearName and author
1977Leptaena sperion Bassett p. 123 figs. pl. 33 figs. 1-3
2005Leptaena sperion Hoel pp. 268 - 270 figs. 3A-R, 10, 11B

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
—Lophophorata
—PanbrachiopodaCarlson and Cohen 2020
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyRafinesquinidaeSchuchert 1893
subfamilyLeptaeninaeHall and Clarke 1894
genusLeptaenaDalman 1828
speciessperion

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.

†Leptaena sperion Bassett 1977
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Diagnosis
ReferenceDiagnosis
O. A. Hoel 2005Large species of Leptaena with large number of irregular, shallow rugae. Dorsal peripheral rim very low. Chilidium massive, convex; pseudodeltidium small and flat. Cardinal process lobes large and diverging. Teeth strong, sockets deep, with accessory denticles along their whole length.