Abstract
Halammohydra intermedia (Hydrozoa, Cnidaria) has been studied with respect to nematocyst morphogenesis and ultrastructure. Morphogenetic events agree with earlier descriptions. TEM studies show that its heteroneme nematocyst (intermediate in shape between euryteles and stenoteles) should be grouped with the stenoteles. In the mature heteroneme the spinous region of the shaft has broad lamellae, while the distal portion of the inverted tubule is unpleated proximally — both characteristic features of stenoteles. Before discharge the unpleated tubule segment is ampulla-shaped with a complex inner structure. Possible functions of the ampulla are suggested.
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References
Blake, A. S., R. S. Blanquet & G. B. Chapman, 1988. Fibrillar ultrastructure of the capsular wall and intracapsular space in developing nematocysts of Aiptasia pallida (Cnidaria: Anthozoa). Trans. am. microsc. Soc. 107: 217–231.
Campbell, R. D., 1977. Structure of Hydra nematocysts: geometry of the connection between the butt and tubule. Trans. am. microsc. Soc. 96: 149–152.
Carré, C. & D. Carré, 1973. Étude du cnidome et de la cnidogenèse chez Apolemia uvaria (Leseur, 1811) (Siphonophore physonecte). Exp. Cell Res. 81: 237–249.
Chapman, G. B., 1961. The fine structure of stenoteles of Hydra. In H. M. Lenhoff & W. F. Loomis (eds), The Biology of Hydra and some other Coelenterates. Univ. of Miami Press, Coral Gables: 131–151.
Clausen, C. & L. von Salvini-Plawen, 1986. Cnidaria. In L. Botosaneanu (ed.), Stygofauna Mundi. E. J. Brill/Dr W. Backhuys, Leiden: 33–42.
Hessinger, D. A. & H. M. Lenhoff (eds), 1988. The Biology of Nematocysts. Academic Press, N.Y., 600 pp.
Hulings, N. C. & J. S. Gray, 1971. A manual for the study of meiofauna. Smithson. Contr. Zool. 78: 1–84.
Lacassagne, M., 1968a. Deux nouveaux types de nématocystes astomocnides chez les Actinulides (Hydrozoaires): les eurytéloides spirotèles et aspirotèles. C. r. hebd. Séanc. Acad. Sci. Paris 266D: 892–894.
Lacassagne, M., 1968b. Les anisorhizes atriches, nouveau type de nématocystes stomocnides présents chez deux formes d'Halammohydra (Hydrozoaires, Actinulides). C. r. hebd. Séanc. Acad. Sci. Paris 266D: 2090–2092.
Mariscal, R. N., 1974. Nematocysts. In L. Muscatine & H. M. Lenhoff (eds), Coelenterate Biology. Academic Press, N.Y.: 129–178.
Remane, A., 1927. Halammohydra, ein eigenartiges Hydrozoon der Nord- und Ostsee. Z. Morph. Ökol. Tiere 7: 643–677.
Slautterback, D. B., 1963. Cytoplasmic microtubules. I. Hydra. J. Cell Biol. 18: 367–388.
Swedmark, B., 1967. Structure et adaptation d'Halammohydra adherens. Cah. Biol. mar. 8: 63–74.
Swedmark, B. & G. Teissier, 1957. Halammohydra vermiformis n. sp. et la famille des Halammohydridae Remane. Bull. Soc. zool. Fr. 82: 38–49.
Swedmark, B. & G. Teissier, 1958. Otohydra vagans n. g., n. sp. Hydrozoaires des sables, apparanté aux Halammohydridées. C. R. hebd. Séanc. Acad. Sci. Paris 247: 238–240.
Tardent, P. & T. Holstein, 1982. Morphology and morphodynamics of the stenotele nematocyst of Hydra attenuata Pall. (Hydrozoa, Cnidaria). Cell Tissue Res. 224: 269–290.
Werner, B., 1964. Halammohydra Remane, Medusennatur und Stellung im System. Verh. dt. zool. Ges. 1964: 162–178.
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Clausen, C. Differentiation and ultrastructure of nematocysts in Halammohydra intermedia (Hydrozoa, Cnidaria). Hydrobiologia 216, 623–628 (1991). https://doi.org/10.1007/BF00026522
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DOI: https://doi.org/10.1007/BF00026522