New species of Venustatrochus Powell, 1951 from New Zealand, and new species of Falsimargarita Powell, 1951 and a new genus of the Calliostomatidae from the southwest Pacific, with comments on some other calliostomatid genera (Mollusca: Gastropoda)

ABSTRACT

Three new species of Venustatrochus Powell, 1951, V. eclectus n. sp., V. galateae n. sp. and V. youngi n. sp. are described from New Zealand, and Calliostoma (Benthastelena) malaita Vilvens, 2009 from the Solomon Islands and Norfolk Ridge and C. atlantis Clench & Aguayo, 1940 from off Cuba are referred to the genus. The radula of the type species of Otukaia, O. kiheiziebisu (Otuka, 1939), is illustrated, and O. ikukoae Sakurai, 1994 is resurrected from synonymy under O. kiheiziebisu and transferred to Tristichotrochus Ikebe, 1942. Benthastelena Iredale, 1936, Fautor Iredale, 1924 and Maurea Oliver, 1926 are each assigned genus rank in Calliostomatinae, and Alertalex Dell, 1956 is treated as a subgenus of Maurea. The South American species Otukaia chilena (Rehder, 1971) and O. delli (McLean & Andrade, 1982), the western subantarctic species O. eltanini Dell, 1990 and Calliostoma muriellae Vilvens, 2001 from Madagascar are referred to Maurea. Otukaia crustulum Vilvens & Sellanes, 2006 is referred to Calliotropis L. Seguenza, 1903 (Calliotropidae). Six new species of Falsimargarita Powell, 1951 are described—F. callista n. sp., F. challengerica n. sp., F. eximia n. sp. and F. tangaroa n. sp., from New Zealand, F. kapala n. sp. from southeastern Australia, and F. coriolis n. sp. from New Caledonia. Calliostoma atlantoides Quinn, 1992 and C. coronatum Quinn, 1992 from off the Lesser Antilles and Brazil, respectively, are referred to Falsimargarita. Phenacomargarites n. gen. is introduced for P. williamsae n. sp. from the Solomon Islands, and P. incomptus n. sp. and P. titan n. sp. from the New Zealand region. Phenacomargarites, Falsimargarita, Selastele Marshall, 1995 and Fautrix Marshall, 1995 are referred to subfamily Fautricinae Marshall, 1995 (elevated from tribe level).

http://zoobank.org/urn:lsid:zoobank.org:pub:09EAD861-3B62-42F9-BCC1-453EBE1347D4

KEYWORDS:

• Akoya
• Alertalex
• Benthastelena
• Fautor
• Fautricinae
• new taxa
• Maurea
• Otukaia
• Selastele
• Tristichotrochus

Acknowledgements

The author is grateful to Barbara Buge and Virginie Héros (Muséum National d'Histoire Naturelle, Paris), Elliot Dawson, Anne-Nina Lörz, Steve O'Shea, Paul Anderson and Kareen Schnabel (formerly or currently of New Zealand Oceanographic Institute, later National Institute of Water and Atmospheric Research Ltd, Wellington), Yasunori Kano (University of Tokyo), Ian Loch (formerly Australian Museum, Sydney), Tomoyuki Nakano (Kyoto University, Wakayama) and Suzanne Williams (The Natural History Museum, London) for access to material, and to Karen Gowlett-Holmes (CSIRO Marine Laboratories, Hobart) for images of trochiform gastropods from seamounts off Tasmania. Thanks to Jean-Claude Stahl (Museum of New Zealand Te Papa Tongarewa, Wellington) for light photography and assistance with imaging technology, David Flynn (Victoria University, Wellington) for assistance with scanning electron microscopy, and Kerry Walton (Wellington) for operation of the instrument. Special thanks to Hamish Spencer (University of Otago, Dunedin) for discussions on published molecular results and supportive comments, and to Dai Herbert and an anonymous referee for constructive comments on the manuscript.

Disclosure statement

No potential conflict of interest was reported by the author.