Profil taxonu
Popis
Type species: H. claviculata (Dall, 1881).
Halonympha was originally described as a subgenus of Cuspidaria to accommodate species with an acute cardinal tooth in the right valve and a posterior 'clavicular' rib in both valves (Dall 1886). Dall (1886) recognized section K (Smith 1885) as being identical, furthermore found a specimen in the U.S.N.M. labelled ‘C. inflata, Porcupine Station 39' (Jeffreys 1881) to be identical to H. claviculata.
The distinctive clavicle or 'buttress' (Dall 1886) is a raised ridge on the inside of the shell that extends along the dorsal edge and, in some specimens, onto the ventral edge of the posterior adductor muscle scar. This rib is much more pronounced in some species than in others.
There are four described species, namely H. claviculata Dall, H. striatella Verrill & Bush, 1898, H. aethiopica Thiele & Jaeckel, 1931 and C. depressor (Jeffreys, 1881), here found to be a Halonympha species. A further, and as yet undescribed, species is present in the collections of the B.M.N.H., labelled ‘C.H. ros Verco' (no. 910. 3. 29. 9594).
Halonympha was originally described as a subgenus of Cuspidaria to accommodate species with an acute cardinal tooth in the right valve and a posterior 'clavicular' rib in both valves (Dall 1886). Dall (1886) recognized section K (Smith 1885) as being identical, furthermore found a specimen in the U.S.N.M. labelled ‘C. inflata, Porcupine Station 39' (Jeffreys 1881) to be identical to H. claviculata.
The distinctive clavicle or 'buttress' (Dall 1886) is a raised ridge on the inside of the shell that extends along the dorsal edge and, in some specimens, onto the ventral edge of the posterior adductor muscle scar. This rib is much more pronounced in some species than in others.
There are four described species, namely H. claviculata Dall, H. striatella Verrill & Bush, 1898, H. aethiopica Thiele & Jaeckel, 1931 and C. depressor (Jeffreys, 1881), here found to be a Halonympha species. A further, and as yet undescribed, species is present in the collections of the B.M.N.H., labelled ‘C.H. ros Verco' (no. 910. 3. 29. 9594).
Allen J. A. & Morgan R. E. (1981). The functional morphology of Atlantic deep water species of the families Cuspidariidae and Poromyidae (Bivalvia): an analysis of the evolution of the septibranch condition.
Autor: Jan Delsing
Zařazené taxony
Počet záznamů: 12druh Halonympha aethiopica (K.H.J. Thiele & S.G.A. Jaeckel, 1931)
druh Halonympha asiatica I. Hayami & T. Kase, 1993
druh Halonympha atlanta J.A. Allen & R.E. Morgan, 1981
druh Halonympha congenita (E.A. Smith, 1885)
druh Halonympha ledaeformis (P. Dautzenberg & H. Fischer, 1897)
druh Halonympha leiomyoides (J. Poutiers, 1981)
druh Halonympha ros (J.C. Verco, 1908)
druh Halonympha salamensis (K.H.J. Thiele & S.G.A. Jaeckel, 1931)
druh Halonympha soyomaruae T.A. Okutani & R. Kawamura, 2002
druh Halonympha striatella A.E. Verrill & K.J. Bush, 1898
Odkazy a literatura
The Interim Register of Marine and Nonmarine Genera [1013545]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Halonympha Dall & E. A. Smith, 1886]
Datum citace: 30. listopad 2019