Tetranema furcata Fraser, 1937a

Calder, Dale R. & Choong, Henry H. C., 2018, Names of hydroids (Cnidaria, Hydrozoa) established by Charles McLean Fraser (1872 - 1946), excluding those from Allan Hancock Expeditions, Zootaxa 4487 (1), pp. 1-83 : 56

Tetranema furcata Fraser, 1937a

Tetranema furcata Fraser, 1937a: 193 , pl. 44, figs. 233a–e.

Astrolabia furcata .— Schuchert, 1997: 151.

Syntypes. BCPM 976-00948-001: Canada, British Columbia, Queen Charlotte Islands (=Haida Gwaii), Moresby Island, Kaison Bank, 28 July 1936, 201 m, two colonies, labelled " type "; 60% IPA.

BCPM 976-00948-002 : Canada, British Columbia, Queen Charlotte Islands (= Haida Gwaii), Moresby Island , Kaison Bank , 28 July 1936, one colony; slide.

Lectotype, by present designation. RBCM 976-00948-003 : Canada, British Columbia, Queen Charlotte Islands (= Haida Gwaii), Moresby Island , Kaison Bank , 201 m, 28 July 1936, one colony, 3.3 cm high, with one gonotheca, in good condition; 70% ethanol.

Paralectotypes. BCPM 976-00948-001: Canada, British Columbia, Queen Charlotte Islands (=Haida Gwaii), Moresby Island, Kaison Bank, 201 m, 28 July 1936, one colony, 2.1 cm high, without gonothecae, in fair condition; labelled " type "; 60% IPA.

BCPM 976-00948-002 : Canada, British Columbia, Queen Charlotte Islands (= Haida Gwaii), Moresby Island , Kaison Bank , 28 July 1936, one colony, 1.3 cm high, with one gonotheca, in good condition; slide.

Type locality. Canada, British Columbia: Queen Charlotte Islands (= Haida Gwaii), west coast of Moresby Island , Kaison Bank ( Fraser 1937a).

Current status. Valid, as Astrolabia furcata ( Fraser, 1937a) .

Remarks. Although Fraser (1937a) designated no name-bearing type for Tetranema furcata , syntype material of the species exists at the RBCM. Two colonies were represented in fluid (BCPM 976-00948-001), with the larger one, in better condition and with a gonotheca, being designated here as the lectotype of the species. It was removed to a new bottle and assigned a new catalogue number (RBCM 976-00948-003). The smaller colony, sterile and in poorer condition, was returned to the original bottle as a paralectotype (BCPM 976-00948-001). A second paralectotype specimen occurs on a microscope slide (BCPM 976-00948-002). Although the slide is broken lateral to the mount, the hydroid colony is in good condition and bears a gonotheca.

The original description of Tetranema furcata by Fraser (1937a) included accounts of both its trophosome and gonosome. With Tetranema Fraser, 1937a being an invalid junior homonym of Tetranema Haeckel, 1879 , the specific name is now combined with a subjective synonym, Astrolabia Naumov, 1955 , as A. furcata . The hydroid is reportedly amphi-Pacific in distribution, with A. heterotheca Naumov, 1955 from a depth of 576 m near Astrolabe Strait, Kuril Islands, Russia, being a subjective junior synonym (Antsulevich 2015).