Taxonomy and diversity of Hydrozoa (Cnidaria, Medusozoa) of La Paz Bay, Gulf of California Author Mendoza-Becerril, María A. CONACYT-Centro de Investigaciones Biológicas del Noroeste S. C., Inst. Politécnico Nacional 195, La Paz, BCS 23096, México. m _ angelesmb @ hotmail. com; https: // orcid. org / 0000 - 0002 - 9449 - 0543 Author Estrada-González, Mariae C. Universidad Autónoma de Baja California Sur, Carretera al Sur km 5.5, La Paz, BCS 23080, México. Author Mazariegos-Villarreal, Alejandra Centro de Investigaciones Biológicas del Noroeste S. C., Inst. Politécnico Nacional 195, La Paz, BCS 23096, México. amaza 04 @ cibnor. mx; https: // orcid. org / 0000 - 0001 - 8932 - 0462 Author Restrepo-Avendaño, Luisa Grupo de Investigación en Limnología Básica y Experimental y Biología y Taxonomía Marina (LimnoBasE y Biotamar), Instituto de Biología, Universidad de Antioquia, Apartado 1226, Medellín, 05001000, Colombia. Author Villar-Beltrán, Rogelio D. Facultad de Ciencias Biológicas y Agropecuarias, Campus Tuxpan, km 7.5 Carretera Tuxpan-Tampico, Tuxpan, Veracruz 92850, México. biolm. rogelio. villar @ gmail. com; https: // orcid. org / 0000 - 0001 - 5459 - 9715 Author Agüero, José Medusozoa México, La Paz, BCS 23060, México. j _ zans @ yahoo. com; https: // orcid. org / 0000 - 0003 - 2565 - 0256 Author Cunha, Amanda F. Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo (USP), Rua do Matão, Travessa 14, 101, São Paulo 05508 - 090, Brazil. amanfcunha @ gmail. com; https: // orcid. org / 0000 - 0003 - 3276 - 2651 text Zootaxa 2020 2020-07-01 4808 1 1 37 journal article 10.11646/zootaxa.4808.1.1 1175-5326 3927861 64E656F6-FBD7-4BA2-B399-B10A97CBEF72 Eudendrium capillare Alder, 1856 Figs. 4 B–E Eudendrium capillare Alder 1856: 355 , pl. 12, figs. 9–12. Eudendrium tenue Agassiz 1865: 160 , fig. 250.— Fraser 1938a: 20 .— Fraser 1938b: 109 .— Fraser 1948: 199 . Type locality. Embleton Bay , Northumberland , Great Britain ( Alder 1856 ) . Material examined. Polyp—PB6_8, sampling site 3 (1), mature, male, on rock, Bryozoa, and Polychaeta. Description. Colony small ( 4 mm high), stolonal and erect, monosiphonic, arising from creeping hydrorhiza, hydrocaulus alternately branched. Exoskeleton with visible layer corresponding to perisarc. Perisarc thin ( 2.8–4.6 µm wide), annulated at the base of the hydrocaulus and branches. Hydranths urn-shaped ( 0.4 mm long from base to hypostome, 0.3 mm wide) with proximal perisarc groove; gastroderm with black pigment spots, without ring of nematocysts above the perisarc groove. Hypostome large, knob-shaped; one whorl of 19–24 solid and filiform tentacles. Male gonophores as fixed sporosacs, with up to three chambers each, on reduced hydranths. Nematocysts (length x diam.). Heterotrichous microbasic eurytele (7.2–9.7 x 3.4–4.2 µm ). More detailed description in Calder (1988) and Marques (2001) . Taxonomic status. Accepted. AphiaID 117544. Remarks. This species is differentiated from Eudendrium ramosum ( Linnaeus, 1758 ) based on the size of the heterotrichous microbasic euryteles, which are larger in E. ramosum (24.7–33.0 µm long, 10.8–17.4 µm wide) ( Marques 2001 ). Distribution. Species frequently distributed in warm waters of the Atlantic, Indian, and Pacific oceans ( Calder 1988 ; Marques 2001 ). In Mexican Pacific, the species was reported in Baja California (Cedros Island and Isla Partida) ( Fraser 1938b ; Fraser 1948 ), Baja California Sur (San Juanico Bay and Dewey Channel) ( Fraser 1948 ), Colima (Clarion Island) ( Fraser 1938a ; Fraser 1948 ) and Guerrero (White Friars Islands) ( Fraser 1938a ).