Cantrainea Jeffreys, 1883
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https://doi.org/ 10.4202/app.2009.0042 |
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persistent identifier |
https://treatment.plazi.org/id/03FBF625-FFD9-2134-7EBD-91BBFDC22715 |
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treatment provided by |
Felipe |
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scientific name |
Cantrainea Jeffreys, 1883 |
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Genus Cantrainea Jeffreys, 1883 View in CoL
Type species: Turbo peloritanus Cantraine, 1835 , original designation; originally described as fossil from Plio−Pleistocene of Sicily, later found also living in Mediterranean Sea and Bay of Biscay .
Discussion.—The concept of Cantrainea unites large Homalopoma −like colloniids. Some authors consider Cantrainea to be a subgenus of Homalopoma (e.g., Knight et al. 1960: 270). Recent authors, however, follow Marshall (1979) and accept the full generic status of Cantrainea . Nevertheless, Marshall (1979: 551) stated that the whole group of Homalopoma −like gastropods should be assessed more critically. A potentially good character for distinguishing Cantrainea and Homalopoma in the fossil record is the presence of a concave subsutural ramp in the former genus. The type species of Cantrainea and also some other species: Cantrainea panamense (Dall, 1908) , C. inexpectata Marshall, 1979 , C. jamsteci ( Okutani and Fujikura, 1990) , C. macleani Warén and Bouchet, 1993 , and C. yoyottei Vilvens, 2001 have a wide ramp whereas C. nuda Okutani, 2001 is totally smooth apart from a finely pleated subsutural cord ( Fig. 7G View Fig herein). The latter species is known from a single specimen ( Fig. 7G View Fig ) and its diagnosis is based solely on the shell characters. As already mentioned by Okutani (2001) the generic assignment of this species is tentative pending examination of the soft body. The lack of concave subsutural ramp might have resulted from general simplification of the sculpture in this species.
Distribution.— Cantrainea includes about a dozen large species of colloniids from deep waters of different regions of all world oceans. At least three species are known from chemosynthesis−based communities. C. jamsteci has been described from hydrothermal vent at the Minami Ensei Knoll (Ryukyu Islands, Japan) by Okutani and Fujikura (1990) and C. panamense has been recently reported from Concepción hydrocarbon seep off Chile ( Sellanes et al. 2008). C. macleani has been described from a hydrocarbon seep on Louisiana Slope but it has also been reported from a station that “is not situated in the vicinity of any known hydrocarbon seep” ( Warén and Bouchet 1993: 10) and therefore not an obligate chemosynthetic community member. Although Okutani (2001) did not report any connection of C. nuda to chemosynthesis−based community, such community was described indeed from “Depression B” of Minami Ensei Knoll by Hashimoto et al. (1995). Therefore, it seems to be most likely that C. nuda is a member of such community. A single occurrence of Cantrainea from ancient chemosynthetic−based associations has been reported from the Miocene Freeman’s Bay Limestone on Trinidad ( Gill et al. 2005).
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