Halecium cf. delicatulum Coughtrey, 1876,

Galea, Horia R., 2010, Notes on a small collection of thecate hydroids (Cnidaria: Hydrozoa) from Tristan da Cunha, south Atlantic, Zootaxa 2336, pp. 1-18: 6

publication ID

http://doi.org/ 10.5281/zenodo.205235

persistent identifier

http://treatment.plazi.org/id/03E7237E-FFF6-4D54-FF77-1ED7F001FCFC

treatment provided by

Plazi

scientific name

Halecium cf. delicatulum Coughtrey, 1876
status

 

Halecium cf. delicatulum Coughtrey, 1876  (morphotype 1)

( fig. 3View FIGURE 3 E, F)

Halecium delicatulum Coughtrey, 1876: 26  , pl. 3 figs 4–5View FIGURE 4View FIGURE 5. – Ralph, 1958 (pro parte): 334, figs 11E, H –N, 12A –K (not 12L –P = Halecium flexile Allman, 1888  ). – Schuchert, 2005: 629, fig. 12.

Material examined. Stn. T17, 06.iii.2005: two sterile stems arising from the same stolon, 3 and 8 mm high, respectively.

Description. Small colony composed of two monosiphonic, unbranched stems, arising from the same stolon. Stems geniculate, divided into long internodes by oblique nodes sloping alternately in opposite directions. Each internode with well-developed distal hydrophore, pointing upwards and surpassing level of node. Hydrothecae moderately deep, pseudodiaphragm present, margin flaring, everted, renovations common. Gonothecae absent.

Remarks. Although devoid of the characteristic female gonothecae, the present specimen fits the accepted concept of H. delicatulum  , due to the geniculate appearance of stem, the morphology of internodes, hydrophores and hydrothecae, and the presence of a pseudodiaphragm. See also discussion under the next hydroid.

Distribution. Reportedly circumglobal in tropical, subtropical and boreal waters (Peña Cantero 2006). This is the first record of this species for Tristan da Cunha.

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Haleciidae

Genus

Halecium

Loc

Halecium cf. delicatulum Coughtrey, 1876

Galea, Horia R. 2010
2010
Loc

Halecium flexile

Allman 1888
1888
Loc

Halecium delicatulum

Coughtrey 1876: 26
1876