. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) Genus PROTONUCULA Cotton 1930 Type species. Protonucula verconis Cotton 1930; OD. Shell relatively fragile, oval, compressed, glossy, concentric sculp- ture; umbo prominent; hinge plate narrow, chevron teeth squat, broad, continuous; ligament relatively small, external, amphidetic. Neilonella salicensis (Seguenza 1877) Type specimen. Whereabouts unknown. Type locality. Upper Pliocene fossil, southern Italy. Cited specimens. BMNH 1995051. Leda pusio Jeffreys 1876a, p. 190, nom. nud.; 1876b, Led
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) Genus PROTONUCULA Cotton 1930 Type species. Protonucula verconis Cotton 1930; OD. Shell relatively fragile, oval, compressed, glossy, concentric sculp- ture; umbo prominent; hinge plate narrow, chevron teeth squat, broad, continuous; ligament relatively small, external, amphidetic. Neilonella salicensis (Seguenza 1877) Type specimen. Whereabouts unknown. Type locality. Upper Pliocene fossil, southern Italy. Cited specimens. BMNH 1995051. Leda pusio Jeffreys 1876a, p. 190, nom. nud.; 1876b, Leda pusio Jeffreys 1879, , in part. Leda pusio Seguenza 1877, p. 1178, , Yoldia sericea Verrill 1884, ; 1885, Leda salicensis Locard 1898, , pi. 14. figs 22-25. Neilonella subovata Verrill and Bush 1897, , figs 7, 8. 22; type locality: Georges Bank to Cape Hatteras, 125-1731 fms; syntype: USNM 34826 (examined by HLS). Tindaria (Neilonella) guineensis Thiele 1931, in Theile and Jaeckel 1931, , , ; type locality; Gulf of Guinea, 710- 2492m; type: ZMHU (not seen). Neilonella guineensis Knudsen 1970, , , , , , figs 8-10. Neilonella schepmani Prashad 1932, , , figs 50, 51; type locality; Banda Sea, Siboga , 2798m; ZMHU (not seen). Pseudoneilonella salicensis Laghi 1986, , text , , figs 1-7. Pseudoneilonella latior Laghi 1986, p. 192, text fig. 1, , figs 7a-c. Pseudoneilonella salicensis atlantica Laghi 1986 p. 192, text , , figs 1-7. Pseudoneilonella montanaroe Laghi 1986, p. 193, text , , figs 4-8; type locality: off Portugal, Porcupine Expedition, 400m, USNM No. 199739 (not seen). Neilonella striolata (Brugnone) Waren 1989, , figs 3a, 16a-d. Waren (1989) gives a lengthy and detailed discussion of much of the nomenclatoral history of this species although, the history is even more complex than he reports. Waren (1989) syn
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