Cirrholovenia tetranema Kramp, 1959

Gil, Marta & Ramil, Fran, 2025, Hydroids (Cnidaria, Hydrozoa) from Guinea Bissau, Zootaxa 5577 (1), pp. 1-89 : 18

Cirrholovenia tetranema Kramp, 1959

Cirrholovenia tetranema Kramp, 1959: 253 , fig. 17a–b.— Calder, 2020: 205, fig. 1d.— Gil et al., 2020: 421 .

Egmundella amirantensis : Millard & Bouillon, 1973: 40–42, fig. 5A–D.— Ramil & Vervoort, 1992a: 22–24, fig. 2A–D.— Peña Cantero & García Carrascosa, 2002: 48–49, fig. 10A–D.— Migotto & Cabral, 2005: 3–13, figs 1–3.

Lafoeina amirantensis : Calder, 1991: 10, fig. 3.— Calder & Vervoort, 1998: 15–16, fig. 5A–C.

Material examined. BISSAU-0810, stn BS191, 10º18'25"– 10º19'20"N, 16º08'47"– 16º08'47"W, 24–25 m, 3-XI-2008: 138 colonies, all without gonothecae, of which nine growing on unidentified hydroids, eight on Idiellana pristis , four on Diphasia digitalis , two on Amphisbetia distans , 41 on Eudendrium capillare , two on Obelia dichotoma , one on Sertularella polyzonias , one on Tridentata turbinata , two on Halecium marocanum , three on Garveia nutans , one on Tridentata loculosa , two on Bimeria vestita , two on Filellum cf. serratum , three on crustaceans, one on a polychaete tube, and 42 on bryozoans.

BISSAU-0810, stn BS194, 10º21'59"– 10º22'36"N, 16º13'23"– 16º14'03"W, 21–24 m, 3-XI-2008: one colony without gonothecae growing on a bryozoan.

Remarks. The colonies studied herein agree with those described by Gil et al. (2020), and represent the first record of this species for Guinea-Bissau. No further discussion is required.

Biology. This species has been reported growing on a great variety of substrates, such as rocks, algae, hydroids, bryozoans, anthozoans and cirripedes ( Peña Cantero & García Carrascosa 2002; Migotto & Cabral 2005, both as E. amiratensis ; Gil et al. 2020). In the southern hemisphere, colonies with gonothecae have been found in summer ( Millard & Bouillon 1973; Migotto & Cabral 2005).

The colonies studied herein were found growing on hydroids, crustaceans, worm tubes and bryozoans. Fertile material was not observed.

Distribution. Cirrholovenia tetranema is considered as a circumglobal species ( Migotto & Cabral 2005). In West Africa, it was collected from Morocco ( Ramil & Vervoort 1992a) and Mauritania ( Gil & Ramil 2017a). Its bathymetrical distribution ranges from 1 ( Calder 1991, as Lafoeina amiratensis ) to 1161 m ( Ríos et al. 2022).

Our material was collected at depths between 21–25 m.