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Type: Article
Published: 2003-09-26
Page range: 1–12
Abstract views: 120
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Crossota millsae (Cnidaria: Trachymedusae: Rhopalonematidae), a new species of viviparous hydromedusa from the deep sea off California and Hawaii

Laboratory 1, Evergreen State College, Olympia, Washington, 98505 USA
Annelida Cnidaria Hydrozoa Coelenterata Crossota gelatinous zooplankton reproductive biology vertical distribution bathypelagic jellyfish

Abstract

A new species of deep-sea jellyfish, Crossota millsae (Cnidaria: Hydrozoa: Trachymedusae: Rhopalonematidae), is described from the North Pacific Ocean off California and Hawaii. Discrete depth sampling showed this species lives at depths below 1000 meters in both geographic locations. The species is more abundant off California than off Hawaii. The greatest population densities were found at ~2500 m off California and at ~1250 m off Hawaii. The burnt-tangerine color of the inner bell and bright pink to lavender color of the ring and radial canals, manubrium and gonads make living specimens of this species difficult to confuse with any other known species of hydromedusa. Sexually dimorphic differences in gonad morphology are evident. The pendant testes contained spermatids at various stages of spermatogenesis as observed using scanning electron microscopy. Ova develop directly into small medusae that reside subumbrellarly between the radial canals of the mother. Various developmental stages of C. millsae are shown in photographs and terminology of brooding and viviparity is discussed relative to other Cnidaria.

References

  1. Alvariño, A. (1967) Bathymetric distribution of Chaetognatha, Siphonophorae, Medusae, and Ctenophorae off San Diego, California. Pacific Science, 21, 474–485.

    Berrill, N.J. (1949) Developmental analysis of scyphomedusae. Biological Review, 24, 393–410. Chia, F.-S. (1976) Sea anemone reproduction: patterns and adaptive radiation. In: Mackie G.O. (Ed.) Coelenterate Ecology and Behavior, Plenum Press, New York, pp. 261–270.

    Bouillon, J., Pagès, F. & Gili, J.-P. (2001) New species of benthopelagic hydromedusae from the Weddell Sea. Polar Biology, 24, 839–845.

    Childress, J.J. (1995) Are there physiological and biochemical adaptations of metabolism in deepsea animals? Trends in Ecology & Evolution, 10, 30–36.

    Childress, J.J., Barnes, A.T., Quetin, L.B. & Robison, B.H. (1978) Thermally protecting cod ends for recovery of living deep-sea animals. Deep-Sea Research, 25, 419–422.

    Childress, J.J., Gluck, D.L., Carney, R.S. & Gowing, M.M. (1989) Biomass distribution and oxygen consumption in a deep-sea benthic boundary layer dominated by gelatinous organisms. Limnology and Oceanography, 34, 915–932.

    Edmands, S. (1995) Mating systems in the sea anemone genus Epiactis. Marine Biology, 123, 723– 733.

    Fautin, D.G. (2002) Reproduction of Cnidaria. Canadian Journal of Zoology, 80, 1735–1754.

    Fautin, D.G., Spaulding, J.G. & Chia, F.-S. (1989) Cnidaria. In: Adiyodi, K.G. & Adiyodi, R.G. (Eds.) Reproductive biology of invertebrates. Volume IV, Part A Fertilization, Development, and Parental Care., John Wiley & Sons, Chichester, pp. 43–62.

    Gage, J.D. & Tyler, P.A. (1991) Deep-sea biology: A natural history of organisms at the deep-sea floor, Cambridge University Press, Cambridge, 504 pp.

    Goffredo, S. & Telò, T. (1998) Hermaphroditism and brooding in the solitary coral Balanophyllia europaea (Cnidaria, Anthozoa, Scleractinia). Italian Journal of Zoology, 65, 159–165.

    Hyman, L.H. (1940) The Invertebrates: Protozoa through Ctenophora, McGraw-Hill, New York, 726 pp.

    Kramp, P.L. (1959) The hydromedusae of the Atlantic Ocean and adjacent waters. "Dana"-Report, 46, 1–283.

    Kramp, P.L. (1968) The hydromedusae of the Pacific and Indian Oceans. "Dana"-Report, 72, 1– 200.

    Larson, R.J., & Harbison, G.R. (1990) Medusae from McMurdo Sound, Ross Sea, including the descriptions of two new species, Leuckartiara brownei and Benthocodon hyalinus. Polar Biology, 11, 19–25.

    Matsumoto, G.I., Baxter, C. & Chen, E.H. (1997) Observations of the deep-sea trachymedusa Benthocodon pedunculata. Invertebrate Biology, 116, 17–25.

    Miller, R.L. (1989) Cnidaria. In: Adiyodi, K.G. & Adiyodi, R.G. (Ed.) Reproductive biology of invertebrates. Volume II, Spermatogenesis and sperm function., John Wiley & Sons, Chichester, pp. 23–73.

    Naumov, D. V. (1971) Gydroidnye i stsifoidnye medusy iz Kurilo-Kamchatskogo zhelova. (Hydromedusae and Scyphomedusae from the Kurile-Kamchatka trench). Trudy Inst. Okeanol., 92, 9–17.

    Purcell, J.E., Breitburg, D.L., Decker, M.B., Graham, W.M., Youngbluth, M.J. & Raskoff, K.A. (2001) Pelagic cnidarians and ctenophores in low dissolved oxygen environments. In: Rabalais, N.N. & Turner, R.E. (Ed.) Coastal hypoxia: consequences for living resources and ecosystems, American Geophysical Union, Washington, D. C., pp. 77–100.

    Reid, S.B., Hirota, J., Young, R.E. & Hallacher, L.E. (1991) Mesopelagic-boundary community in Hawaii: micronekton at the interface between neritic and oceanic ecosystems. Marine Biology, 109, 427–440.

    Robison, B.H. (1993) Midwater research methods with MBARI's ROV. Marine Technology Society Journal, 28, 32–39.

    Russell, F.S. & Rees, W.J. (1960) The viviparous scyphomedusa Stygiomedusa fabulosa Russell. Journal of the Marine Biological Association of the United Kingdom, 39, 303–317.

    Tardent, P. (1978) Coelenterata, Cnidaria. In: Seidel, F. (Ed.) Einleitung zum Gesamtwerk Morphogenetische Arbeitsmethoden und Begriffssysteme, Reihe 1, Lieferung 1: A-1, Gustav Fisher, Jena, pp. 69–415.

    Thuesen, E.V. (1992) Enzymatic activities, metabolic rates and chemical compositions of midwater chaetognaths, medusae, and certain nemertean and polychaete worms in relation to habitat depth, University of California, Santa Barbara, 136 pp.

    Thuesen, E.V. (1993) Vampyrocrossota childressi, a new genus and species of black medusa from the bathypelagic zone off California (Cnidaria: Trachymedusae: Rhopalonematidae). Proceedings of the Biological Society of Washington, 106, 190–194.

    Thuesen, E.V. & Childress, J.J. (1994) Oxygen consumption rates and metabolic enzyme activities of oceanic California medusae in relation to body size and habitat depth. Biological Bulletin, 187, 84–98.

    Vanhöffen, E. (1902) Die Craspedoten Medusen der deutschen Tiefsee Expedition 1898-1899. I. Trachymedusen. Wissenschaftliche Ergebnisse der Deutschen Tiefsee Expedition "Valdivia", 3, 55–86.

    Young, C.M. (2003) Reproduction, development and life-history traits. In: Tyler, P.A. (Ed.) Ecosystems of the Deep Ocean. Elsevier, Amsterdam, pp. 381–426.