. The Bulletin of zoological nomenclature. Animals. Bulletin of Zoological Nomenclature 63(1) March 2006 9 distinctive species of hydroid ( Bonnevie, 1899a, pp. 7-8, 1899b, pp. 49-50; Stechow, 1923, p. 80; Fraser, 1937, p. 43, pi. 8, fig. 33, 1944, pp. 74-75, pi. 12, fig. 50, 1948, pp. 183, 198; Kramp, 1943, pp. 16, 43; Yamada, 1954, p. 127, text-fig. 15, 1959, p. 26; Calder, 1972, p. 226, pi. 2, fig. 6; Hirohito, 1977, pp. 12-13, text-fig. 3, 1988, p. 88, fig. 31d-h). Eudendrium tenellum auct. is recognizable from the morphology of its hydranths and gonophores (Calder, 1972; Hirohito, 197
. The Bulletin of zoological nomenclature. Animals. Bulletin of Zoological Nomenclature 63(1) March 2006 9 distinctive species of hydroid ( Bonnevie, 1899a, pp. 7-8, 1899b, pp. 49-50; Stechow, 1923, p. 80; Fraser, 1937, p. 43, pi. 8, fig. 33, 1944, pp. 74-75, pi. 12, fig. 50, 1948, pp. 183, 198; Kramp, 1943, pp. 16, 43; Yamada, 1954, p. 127, text-fig. 15, 1959, p. 26; Calder, 1972, p. 226, pi. 2, fig. 6; Hirohito, 1977, pp. 12-13, text-fig. 3, 1988, p. 88, fig. 31d-h). Eudendrium tenellum auct. is recognizable from the morphology of its hydranths and gonophores (Calder, 1972; Hirohito, 1977) and from its comp- lement of nematocysts or cnidome (Hirohito, 1988). The presence of these characters and their nature is now considered critical for the differentiation of species assigned to the family eudendriidae (Marques et al., 2000a, 2000b; Marques, 2001). 3. At present two distinctive species are cited in the literature under the name Eudendrium tenellum Allman, 1877. Colonies of both Eudendrium tenellum Allman, 1877 and E. tenellum auct. resemble those of Eudendrium capillare Alder, 1856. Naumov (1960, p. 244), and later Christiansen (1972, p. 290), regarded E. tenellum as a junior synonym of £. capillare. Contrary opinions were expressed by Calder (1972, p. 226) and Hirohito (1977, p. 13), who considered E. tenellum auct. distinct in having smaller and less-branched colonies, and in possessing gonophores on complete rather than atrophied hydranths (Calder, 1988, p. 43). 4. As part of studies on the genus Eudendrium, we recently examined the type material of E. tenellum described by Allman (1877). The cnidome, from an examination of scarce coenosarc material, was found to comprise small microbasic euryteles as in E. capillare. On the other hand, the study of Hirohito's (1988) material of £â . tenellum auct. (the female colonies numbered 1078 (Japan, Samejima, Hayama, 1 )) revealed the presence of macrobasic euryteles, 20-27 x 7-10 jjm. There- fore,
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