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Localization of digestion activities in polyps ofNausithoe planulophora andThecoscyphus zibrowii (Coronatae, Scyphozoa, Cnidaria)

  • Dirk Bumann
  • Gerhard Jarms
Article

Abstract

Coronate polyps are unique among cnidarians in having a complete peridermal tube, a ring canal, and four radial canals or pores at their oral region. Moreover, most of these species possess tooth whorls that narrow the gastric cavity considerably. Using fluorescence-labeled prey, it was demonstrated that the ring canal is not involved in digestion or redistribution of nutrients but possibly serves as a hydrostatic flex point for the fast retraction of the tentacle crown into the exoskeleton. The tooth whorls considerably affect the localization of digestion activities by blocking the passage of large prey fragments. Hence, endocytosis in a coronate species with tooth whorls occurred around the uppermost tooth whorl whereas, in a species lacking tooth whorls endocytosis occurred at the basal end. To meet the high nutrient demands of the basal region, nutrients must be redistributed in the species with tooth whorls. The extra energy required for this redistribution could be an important disadvantage of tooth whorls.

Keywords

Oral Region Gastric Cavity Basal Disk Digestion Activity Bright Field Micrograph 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Literature cited

  1. Alvarez-Cadena, J. N. & Segura-Puertas, L., 1993. Experimental observations on the feeding ofLinuche unguiculata (Cnidaria: Scyphozoa).—An. Inst. Cienc. Mar. Limnol. Univ. Nac. Auton. Mexico20, 125–127.Google Scholar
  2. Bischoff, G. C. O., 1978. Internal structures of conulariid tests and their functional significance, with special reference toCircoconularia n. suborder (Cnidaria, Scyphozoa).—Senckenberg. leth59, 275–313.Google Scholar
  3. Bischoff, G. C. O., 1989.Byroniida new order from early Palaeozoic strata of eastern Australia (Cnidaria, thecate scyphopolyps).—Senckenberg. leth69, 467–521.Google Scholar
  4. Black, N. A., Szmant, A. M. & Tomchik, R. S., 1994. Planulae of the scyphomedusaLinuche unguiculata as a possible cause of seabather's eruption.—Bull. mar. Sci.54, 955–960.Google Scholar
  5. Blanquet, R. S. & Wetzel, B., 1975. Surface ultrastructure of the scyphopolypChrysaora quinquecirrha.—Biol. Bull. mar. biol. Lab., Woods Hole148, 181–192.CrossRefGoogle Scholar
  6. Chapman, D. M., 1973. Behavior and flagellar currents in coronate polyps (Scyphozoa) and comparison with semaestome polyps.—Helgoländer wiss. Meeresunters.25, 214–227.CrossRefGoogle Scholar
  7. Chapman, D. M. & Werner, B., 1972. Structure of a solitary and a colonial species ofStephanoscyphus (Scyphozoa, Coronatae) with observations on periderm repair.—Helgoländer wiss. Meeresunters.23, 393–421.CrossRefGoogle Scholar
  8. Fossaa, J. H., 1992. Mass occurrence ofPeriphylla periphylla (Scyphozoa, Coronatae) in a Norwegian fjord.—Sarsia77, 237–251.Google Scholar
  9. Hentschel, J. & Hündgen, M., 1980. Morphologie und Ultrastruktur des ScyphistomaAurelia aurita (Scyphozoa, Semaeostomae).—Zool. Jb. (Abt. Anat. Ontog. Tiere)104, 295–316.Google Scholar
  10. Jarms, G., 1988. Zur Morphologie, Biologie und Systematik der Nausithoidae (Coronatae, Scyphozoa).—Diss., Univ. Hamburg, 124 pp.Google Scholar
  11. Jarms, G., 1990. Neubeschreibung dreier Arten der GattungNausithoe (Coronatae, Scyphozoa) sowie Wiederbeschreibung der ArtNausithoe marginata Kölliker 1853.—Mitt. hamb. zool. Mus. Inst.87 7–39.Google Scholar
  12. Jarms, G., 1991. Taxonomic characters from the polyp tubes of coronate medusae (Scyphozoa, Coronatae).—Hydrobiologia216/217 463–470.CrossRefGoogle Scholar
  13. Jerre, F., 1994. Anatomy and phylogenetic significance ofEoconularia loculata, a conulariid from the Silurian of Gotland.—Lethaia27, 97–109.CrossRefGoogle Scholar
  14. Larson, R. J., 1990. Scyphomedusae and cubomedusae from the eastern Pacific.—Bull. mar. Sci.47, 546–556.Google Scholar
  15. Lesh-Laurie, G. E. & Suchy, P. E., 1991. Cnidaria: Scyphozoa and Cubozoa. In: Microscopic anatomy of invertebrates Ed. by F. W. Harrison & J. A. Westfall. Wiley, New York,2, 185–266.Google Scholar
  16. Mauchline, J. & Harvey, P. F., 1983. The scyphomedusae of the Rockall Trough, northeastern Atlantic Ocean.—J. Plankt. Res.5, 881–890.CrossRefGoogle Scholar
  17. Schuchert, P., 1993. Phylogenetic analysis of the Cnidaria.—Z. zool. Syst. Evol.31, 161–173.Google Scholar
  18. Uriz, M.-J., Rosell, D. & Maldonado, M., 1992. Parasitism, commensalism or mutualism? The case of Scyphozoa (Coronatae) and horny sponges.—Mar. Ecol. Prog. Ser.81, 247–255.CrossRefGoogle Scholar
  19. Van Iten, H., 1991. Evolutionary affinities of conulariids. In: The early evolution of Metazoa and the significance of problematic taxa. Ed. by A. M. Simonetta & S. Conway-Morris. Cambridge Univ. Press, London, 145–156.Google Scholar
  20. Van Iten, H., 1992a. Morphology and phylogenetic significance of the corners and midlines of the conulariid test.—Paleontology35, 335–358.Google Scholar
  21. Van Iten, H., 1992b. Microstructure and growth of the conulariid test: implications for conulariid affinities.—Paleontology35, 359–372.Google Scholar
  22. Van Iten, H. & Cox, R. S., 1992. Evidence of clonal budding in a radial cluster ofParaconularia crustula (White) (Pennsylvanian: ?Cnidaria).—Lethaia25, 421–426.CrossRefGoogle Scholar
  23. Van Praet, M., 1980. Absorption of substances dissolved in the sea-environment, particles and extracellular digestion products inActinia equina (Cnidaria, Actiniaria).—Reprod. Nutr. Dev.20, 1393–1399.PubMedCrossRefGoogle Scholar
  24. Werner, B., 1966.Stephanoscyphus (Scyphozoa, Coronatae) und seine direkte Abstammung von den fossilen Conulata.—Helgoländer wiss. Meeresunters.13, 317–347.CrossRefGoogle Scholar
  25. Werner, B., 1967. Morphologie, Systematik und Lebensgeschichte vonStephanoscyphus (Scyphozoa, Coronatae) sowie seine Bedeutung für die Evolution der Scyphozoa.—Zool. Anz. (Suppl.)30, 297–319.Google Scholar
  26. Werner, B., 1971.Stephanoscyphus planulophorus n. spec., ein neuer Scyphopolyp mit einem neuen Entwicklungsmodus.—Helgoländer wiss. Meeresunters.22 120–140.CrossRefGoogle Scholar
  27. Werner, B., 1984. Cnidaria. In: Lehrbuch der Speziellen Zoologie, Band I: Wirbellose Tiere, 2. Teil: Cnidaria, Ctenophora, Mesozoa Plathelminthes, Nemertini, Entoprocta, Nemalthelminthes, Priapulida. Ed. by H.-E. Gruner. Fischer, Jena, 11–305.Google Scholar
  28. Wong, D. E., Meinking, T. L., Rosen, L. B., Taplin, D., Hogan, D. J. & Burnett, J. W., 1994. Seabather's eruption. Clinical, histologic, and immunologic features.—J. Am. Acad. Derm.30, 399–406.PubMedCrossRefGoogle Scholar

Copyright information

© Biologische Anstalt Helgoland 1997

Authors and Affiliations

  • Dirk Bumann
    • 1
  • Gerhard Jarms
    • 2
  1. 1.Marine Biological LaboratoryWoods HoleUSA
  2. 2.Zoologisches Institut und Zoologisches MuseumUniversität HamburgHamburgGermany

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