Plumularia setacea ( Linnaeus, 1758 )

Gil, Marta & Ramil, Fran, 2025, Hydroids (Cnidaria, Hydrozoa) from Guinea Bissau, Zootaxa 5577 (1), pp. 1-89 : 69-70

Plumularia setacea ( Linnaeus, 1758)

Sertularia setacea Linnaeus, 1758: 813 .

Plumularia setacea : Ramil & Vervoort, 1992a: 191–193, fig. 47F–I.— Ansín Agís et al., 2001: 238–245, fig. 91.— Peña Cantero & García Carrascosa, 2002: 117–119, fig. 21C–D.— Vervoort, 2006: 259.— Ansín Agís et al., 2014: 824, fig. 22.— Gravili et al., 2015: 127–128 , fig. 90A–D.

Material examined. BISSAU-0810, stn BS147, 11º08'35"– 11º08'27"N, 17º11'31"– 17º10'37"W, 186–306 m, 26-X-2008: two colonies without gonothecae, growing on Diphasia margareta .

BISSAU-0810, stn BS152, 10º31'12"– 10º30'19"N, 17º12'34"– 17º12'32"W, 300–305 m, 27-X-2008: 22 colonies (four with gonothecae), all growing on Lytocarpia myriophyllum .

BISSAU-0810, stn BS191, 10º18'25"– 10º19'20"N, 16º08'47"– 16º08'47"W, 24–25 m, 3-XI-2008: three colonies without gonothecae, substrate unknown.

BISSAU-0810, stn BS192, 10º19'30"– 10º20'15"N, 16º10'27"– 16º10'59"W, 24 m, 3-XI-2008: one colony without gonothecae, 12 mm high, substrate unknown.

BISSAU-0810, stn BS200, 10º18'55"N, 16º25'07"W, 79 m, 4-XI-2008: four colonies without gonothecae, growing on Pseudoplumaria marocana .

Remarks. Plumularia setacea is a well-known species and requires no further comment.

Biology. This species has been found growing on algae, bio-concretions, mollusk shells, bryozoans, sponges, cirripeds, anthozoans and other hydroids ( Peña Cantero & García Carrascosa 2002; Gil & Ramil 2021a). Gonothecae have been found throughout the year in both hemispheres ( Gili et al. 1989; Ansín Agís et al. 2001; Genzano & Zamponi 2002).

Our colonies were found growing on the hydroids D. margareta , L. myriophyllum and P. marocana . Gonothecae were observed in October.

Distribution. Plumularia setacea is a circumglobal species ( Ansín Agís et al. 2001; Gil et al. 2020). In West Africa, it has been recorded from Morocco to Namibia ( Gil et al. 2020), including the Vema Seamount ( Millard 1966b; Gil & Ramil 2021b). Its bathymetric distribution ranges from 0 to 1513 m ( Ansín Agís et al. 2001; Gil & Ramil 2017a).

The material studied by us was collected at depths between 24–306 m.