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Leptellina (Leptellina) rhacta

Strophomenata - Strophomenida - Leptellinidae

Taxonomy
Leptellina rhacta was named by Williams (1962). Its type specimen is BB.26031, a shell (complete shell), and it is a 3D body fossil. Its type locality is South-east side of quarry, ½ mile north-east of Brockloch Farm, which is in a Llandeilo carbonate mudstone/limestone in the Stinchar Formation of the United Kingdom.

It was recombined as Leptellina (Leptellina) rhacta by Candela and Harper (2014).

Sister species lacking formal opinion data
L. elegantula

Synonymy list
YearName and author
1962Leptellina rhacta Williams p. 164 figs. Pl. XV, figs. 17-19, 21, 22
2014Leptellina (Leptellina) rhacta Candela and Harper pp. Supplement 1

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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
superfamilyPlectambonitoideaJones 1928
familyLeptellinidaeUlrich and Cooper 1936
subfamilyLeptellininaeUlrich and Cooper 1936
genusLeptellinaUlrich and Cooper 1936
subgenusLeptellinaUlrich and Cooper 1936
speciesrhacta()

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.

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Diagnosis
ReferenceDiagnosis
A. Williams 1962Highly concavo-convex and subquadrate Leptellina with the pedicle valves almost threefifths as deep as long and nearly three-quarters as long as wide, dome-like in transverse profile with steeply sloping sides; ornamentation finely parvicosteUate with a modal count of 11 costellae per millimetre antero-medianly and 5 strongly accentuated costae conspicuous umbonaUy, concentric lamellae excessively developed in irregular bands except for the shell surface within 3 mm. of the umbo; lophophore platform well defined, over one-half as long as wide and almost three-fifths as long as the brachial valve; ventral muscle-scar subtriangular, about one-quarter as long as the pedicle valve.