Eudendrium capillare Alder, 1856

Mendoza-Becerril, María A., Estrada-González, Mariae C., Mazariegos-Villarreal, Alejandra, Restrepo-Avendaño, Luisa, Villar-Beltrán, Rogelio D., Agüero, José & Cunha, Amanda F., 2020, Taxonomy and diversity of Hydrozoa (Cnidaria, Medusozoa) of La Paz Bay, Gulf of California, Zootaxa 4808 (1), pp. 1-37 : 10

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).

Figures

FIGURE 4. A Bimeria vestita Wright, 1859: pseudohydrotheca. B–E Eudendrium capillare Alder, 1856: B, colony; C, hydranths; D, male gonophore; E, nematocyst heterotrichous microbasic eurytele. F–M Aglaophenia sp. Fraser, 1938b: F, hydrocaulus; G–H, hydrocladia; I–J, hydrotheca with nematothecae; K, corbula; L, nematocyst microbasic mastigophore; M, colony. Scale equals A—100 µm; B, K—500 µm; C—250 µm; D, H—220 µm; E—11 µm; F—300 µm; G—200 µm; I—50 µm; J—70 µm; L—20 µm; M—5 mm.