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Polymorphism and pore signature patterns in the copepod genus Oncaea (Cyclopoida)

Published online by Cambridge University Press:  16 October 2009

S. J. Malt
S. J. Malt
Affiliation:
Department of Zoology, British Museum (Natural History), Cromwell Road, London, SW7 5BD
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Abstract

Species of the cyclopoid copepod genus Oncaea are commonly polymorphic. Using material from several localities, forms of O. venusta Philippi, O. mediterranea Claus and O. conifer a Giesbrecht are described, and specimens of two closely related and morphologically similar species, O. ornata Giesbrecht and O. englishi Heron, are compared. The integumental pore signature patterns of all these species are mapped from stained, tissue-free integuments. Each species has its own characteristic pore signature pattern and sexual dimorphism is confined to the urosomal pore pattern. Similarly the prosomal pore patterns of female copepodid 5 do not usually differ from those of adult females, but urosomal patterns are distinct. Juveniles of O. conifera are exceptional in this respect; their prosomal pore pattern lacks the detail of the adult pattern. Differences in the pore signatures of O. ornata and O. englishi confirm their status as separate species. Signatures in the O. conifera ‘group’ may also prove to be distinct. Whereas intraspecific variation in pore signatures may exist at a level below the resolution of this technique, such small morphological differences should be considered to be taxonomically insignificant.

The implications of polymorphism in the process of speciation, and the mechanisms by which the polymorphic forms are maintained are discussed.

Scanning electron microscopy and light microscopy are used to examine the morphology of pores and their associated sensilla. Three types of sensilla are described, peg, short-hair and long-hair sensilla.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 63 , Issue 2 , May 1983 , pp. 449 - 466
Copyright
Copyright © Marine Biological Association of the United Kingdom 1983

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References

REFERENCES

Boxshall, G. A., 1977. The planktonic copepods of the northeastern Atlantic Ocean: some taxonomic observations on the Oncaeidae (Cyclopoida). Bulletin of the British Museum (Natural History) (Zoology), 31, 101–155.Google Scholar
Boxshall, G. A., 1982. On the anatomy of the misophrioid copepods, with special reference to Benthomisophria palliata Sars. Philosophical Transactions of the Royal Society (B), 297, 125–181.Google Scholar
Elofsson, R., 1971. The ultrastructure of a chemoreceptor organ in the head of copepod crustaceans. Acta zoologica, 52, 299–315.CrossRefGoogle Scholar
Farran, G. P., 1929. Copepoda. Natural History Report. British Antarctic Terra Nova Expedition, 1910 (Zoology), 8, 203–306.Google Scholar
Farran, G. P., 1936. Copepoda. Scientific Reports of the Great Barrier Reef Expedition, 5, 73–142.Google Scholar
Ferrari, F. D., 1975. Taxonomic notes of the genus Oncaea (Copepoda: Cyclopoida) from the Gulf of Mexico and northern Caribbean Sea. Proceedings of the Biological Society of Washington, 88, 217–232.Google Scholar
Ferrari, F. D., 1977. A redescription of Oithona dissimilis Lindberg 1940 with a comparison to Oithona hebes Giesbrecht 1891 (Crustacea: Copepoda: Cyclopoida). Proceedings of the Biological Society of Washington, 90, 400–411.Google Scholar
Ferrari, F. D., 1981. Oithonawellershausi, newspecies, and O.spinulosa Lindberg, 1950 (Copepoda: Cyclopoida: Oithonidae) from the mouth of the Pearl River, China. Proceedings of the Biological Society of Washington, 94, 1244–1257.Google Scholar
Ferrari, F. D. & Bowman, T. E., 1980. Pelagic copepods of the family Oithonidae (Cyclopoida) from the east coast of Central and South America. Smithsonian Contributions to Zoology, no. 312, 27 pp.Google Scholar
Fleminger, A., 1973. Pattern, number, variability, and taxonomic significance of integumental organs (sensilla and glandular pores) in the genus Eucalanus (Copepoda, Calanoida). Fishery Bulletin. National Oceanic and Atmospheric Administration of the United States, 71, 965–1010.Google Scholar
Fleminger, A., 1975. Geographical distribution and morphological divergence in American coastal-zone planktonic copepods of the genus Labidocera. In Estuarine Research, vol. 1. Chemistry, Biology and the Estuarine System (ed. Cronin, L. E.), pp. 392–419. Academic Press.Google Scholar
Fleminger, A. & Hulsemann, K., 1977. Geographical range and taxonomic divergence in North Atlantic Calanus (C.helgolandicus, C.finmarchicus and C.glacialis). Marine Biology, 40, 233–248.CrossRefGoogle Scholar
Gharagozlou-Van Ginneken, I. D., 1979. Etude ultrastructurale et cytochimique de l'activité temporaire des glandes tégumentaires d'un Crustacé Copépode. Annales de sciences naturelles (Zoologie), 1, 205–212.Google Scholar
Giesbrecht, W., 1902. Copepoden. Résultats du Voyage du S.Y. Belgica en 1897–99 (Zoology), 49 pp.Google Scholar
Heron, G. A., 1977. Twenty-six species of Oncaeidae (Copepoda, Cyclopoida) from the southwest Pacific-Antarctic area. Antarctic Research Series, 26, 37–96.CrossRefGoogle Scholar
Laverack, M. S., 1968. On the receptors of marine invertebrates. Oceanography and Marine Biology, an Annual Review, 6, 249–324.Google Scholar
Laverack, M. S., 1974. The structure and function of chemoreceptor cells. In Chemoreception in Marine Organisms (ed. Grant, P. T. and Mackie, A. M.), pp. 1–48. Academic Press.Google Scholar
Mcgowan, J. A., 1963. Geographical variation In Limacina helicina in the North Pacific. In Speciation in the Sea (ed. Harding, J. P. and Tebble, N.), pp. 109–128. London: Systematics Association.Google Scholar
Mauchline, J., 1977. The integumental sensilia and glands of pelagic Crustacea. Journal of the Marine Biological Association of the United Kingdom, 57, 973–994.CrossRefGoogle Scholar
Mauchline, J. & Nemoto, T., 1977. The occurrence of integumental organs in copepodid stages of calanoid copepods. Bulletin of Plankton Society of Japan, 24, 32–38.Google Scholar
Mayr, E., 1942. Systematics and the Origin of Species from the Viewpoint of a Zoologist. 334 pp. New York: Columbia University Press.Google Scholar
Moulton, T. P., 1973. Principle component analysis of variation in form within Oncaea conifera (Giesbrecht, 1891), a species of copepod (Crustacea). Systematic Zoology, 22, 141–156.CrossRefGoogle Scholar
Rose, M. & Vassière, R., 1951. Le système excréto-glandulaire des sapphirines. Archives de zoologie expérimental et générale, 87, 134–138.Google Scholar
Sars, G. O., 1900. Crustacea. Scientific Results. Norwegian North Polar Expedition, 1893–96, 1(5), 137 pp.Google Scholar
Sewell, R. B. S., 1947. The free-swimming planktonic Copepoda. Systematic account. Scientific Reports. John Murray Expedition 1933–34 (Zoology), 8, 317–592.Google Scholar
Speith, P. T., 1979. Environmental heterogeneity: a problem of contradictory selection pressures, gene flow, and local polymorphism. American Naturalist, 113, 247–260.CrossRefGoogle Scholar
Strickler, J. R., 1975. Intra- and interspecific information flow among planktonic copepods: receptors. Verhandlungen der Internationalen Vereinigung für theoretische und angewandte Limnologie, 19, 2951–2958.Google Scholar
Tanaka, O., 1960. Pelagic Copepoda. Special Publications from the Seto Marine Biological Laboratory, 10, 1–177.CrossRefGoogle Scholar
Wilson, C. B., 1932. The copepods of the Woods Hole region, Massachusetts. Bulletin. United States National Museum, no. 158, 635 pp.Google Scholar