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Krylova, Elena M; Sahling, Heiko (2006): Morphological descriptions from the recent bivalve of the genus Calyptogena (Vesicomyidae) [dataset publication series]. PANGAEA,, Supplement to: Krylova, EM; Sahling, H (2006): Recent bivalve molluscs of the genus Calyptogena (Vesicomyidae). Journal of Molluscan Studies, 72, 359-395,

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The genus Calyptogena (Bivalvia: Vesicomyidae) comprises highly specialized bivalves living in symbiosis with sulphur-oxidizing bacteria in reducing habitats. In this study, the genus is revised using shell and anatomical features. The work is based on type material, as well as on the extensive collection of vesicomyids obtained during twelve expeditions to the Pacific and Indian Oceans. Nine Recent species are ascribed to the genus Calyptogena, four of which are new: C. pacifica Dall, 1891, C. fausta Okutani, Fujikura & Hashimoto, 1993, C. rectimargo Scarlato, 1981, C. valdiviae (Thiele & Jaeckel, 1931), C. gallardoi Sellanes & Krylova, 2005, C. goffrediae n. sp., C. starobogatovi n. sp., C. makranensis n. sp. and C. costaricana n. sp. The characteristic features of Calyptogena are: shell up to 90 mm in length, elongate-elliptical or elongate; presence of escutcheon; presence of broad posterior ramus (3b) of right subumbonal cardinal tooth as well as right posterior nymphal ridge; absence of pallial sinus as a result of attachment of intersiphonal septal retractor immediately adjacent to ventral surface of posterior adductor; absence of processes on inner vulva of inhalant siphon; presence of inner demibranch only, with descending and ascending lamellae with interlamellar septa not divided into separate tubes. The most closely related taxa to Calyptogena are probably the genus Isorropodon Sturany, 1896, and the group of species represented by 'Calyptogena' phaseoliformis Métivier, Okutani & Ohta, 1986. These groups have several characters in common, namely absence of pallial sinus, presence of single inner pair of demibranchs and absence of processes on inner vulva of inhalant siphon. The worldwide distribution of the genus Calyptogena suggests that methane seeps at continental margins are the major dispersal routes and that speciation was promoted by geographical isolation. Recent species diversity and fossil records indicate that the genus originated in the Pacific Ocean. Sufficient data to discuss the distribution at species level exist only for C. pacifica, which has a remarkably narrow bathymetric range. Published studies on the physiology of C. pacifica suggest that adaptation to a specific geochemical environment has led to coexisting vesicomyid genera. The bacteria-containing gill of C. pacifica and other Calyptogena species is one of the most specialized in the family Vesicomyidae and may reflect these ecological adaptations.
Median Latitude: 23.372622 * Median Longitude: -1.253793 * South-bound Latitude: -35.175000 * West-bound Longitude: -143.843415 * North-bound Latitude: 55.766700 * East-bound Longitude: 167.250000
Date/Time Start: 1898-08-25T00:00:00 * Date/Time End: 2002-09-16T00:00:00
AKM22-2320_15-28 * Latitude: 55.383300 * Longitude: 167.250000 * Elevation: -489.0 m * Method/Device: MIR-2 deep-sea manned submersible (MIR-2) * Comment: dive 15/28
Albatross_Stn_3077 (3077) * Latitude: 55.766700 * Longitude: -132.400000 * Elevation: -580.0 m * Location: East Pacific Ocean, Dixon Entrance * Method/Device: Multiple investigations (MULT)
AMK12-1505 * Latitude: 45.916660 * Longitude: -130.033330 * Date/Time: 1986-09-26T00:00:00 * Elevation: -1540.0 m * Location: Axial Seamount, Juan de Fuca Ridge * Campaign: AMK12 * Basis: Akademik Mstislav Keldysh * Method/Device: Submersible PISCES (PISCES)
12 datasets

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Datasets listed in this publication series

  1. Krylova, EM; Sahling, H (2006): (Table 3) Measurements of right valves of Calyptogena pacifica.
  2. Krylova, EM; Sahling, H (2006): (Table 4) Measurements of right valves of Calyptogena fausta.
  3. Krylova, EM; Sahling, H (2006): (Table 5) Measurements of right valves of Calyptogena rectimargo.
  4. Krylova, EM; Sahling, H (2006): (Table 6) Measurements of valves of Calyptogena valdiviae.
  5. Krylova, EM; Sahling, H (2006): (Table 6) Measurements of valves of Vesicomya longa.
  6. Krylova, EM; Sahling, H (2006): (Table 7) Measurements of right valves of Calyptogena goffrediae.
  7. Krylova, EM; Sahling, H (2006): (Table 8) Measurements of right valves of Calyptogena starobogatovi.
  8. Krylova, EM; Sahling, H (2006): (Table 9) Measurements of right valves of Calyptogena makranensis.
  9. Krylova, EM; Sahling, H (2006): (Table 10) Measurements of right valves of Calyptogena costaricana.
  10. Krylova, EM; Sahling, H (2006): (Table 11) Shell characteristics of recent Calyptogena species.
  11. Krylova, EM; Sahling, H (2006): (Table 12) Main characters of genera currently referred to the family Vesicomyidae.
  12. Krylova, EM; Sahling, H (2006): (Table 13) List of recent species originally described as Calyptogena or usually referred to Calyptogena, excluded from the genus.