Sertularelloides cylindritheca ( Allman, 1888 )

Gil, Marta & Ramil, Fran, 2025, Hydroids (Cnidaria, Hydrozoa) from Guinea Bissau, Zootaxa 5577 (1), pp. 1-89 : 44

Sertularelloides cylindritheca ( Allman, 1888)

Sertularia cylindritheca Allman, 1888: 59–60 , pl. XXIX fig. 1a.— Versluys, 1899: 36–37, fig. 5. Sertularella cylindritheca : Nutting, 1904: 87, pl. 19 fig. 4.— Billard, 1906a: 183–184.— Billard, 1931a: 676, fig. 2.— Vervoort,

1959: 266–269, figs 30–31.— Gili et al., 1989: 100–101, fig. 25.— Ramil & Vervoort, 1992a: 217–219, fig. 60a.— Migotto,

1996: 68, fig. 13a.—Grohman et al., 2003: 14.— Calder & Kirkendale, 2005: 485. Sertularelloides cylindritheca : Moura, 2020: 111–115, fig. 22a–b.

Material examined. BISSAU-0810, stn BS143, 11º15'35"– 11º16'30"N, 17º09'49"– 17º09'49"W, 95–96 m, 25-X-2008: one colony, 55 mm high without gonothecae, substrate unknown.

BISSAU-0810, stn BS199, 10º16'49"– 10º17'29"N, 16º22'15"– 16º22'49"W, 65–70 m, 4-XI-2008: one colony without gonothecae, substrate unknown.

BISSAU-0810, stn BS200, 10º18'55"N, 16º25'07"W, 79 m, 4-XI-2008: five colonies, 105–220 mm high without gonothecae, substrate unknown.

BISSAU-0810, stn BS226, 11º22'11"– 11º21'55"N, 17º02'30"– 17º01'54"W, 35–37 m, 9-XI-2008: 44 colonies, 70–220 mm high without gonothecae, substrate unknown.

Remarks. Sertularelloides cylindritheca is a well-known species, widely distributed in West Africa. No further discussion is necessary.

Biology. This species has been found growing on a great variety of invertebrates ( Gil & Ramil 2023b). In the northern hemisphere, colonies with gonothecae have been found in January, and August–September ( Billard 1931a; Vervoort 1959, both as Sertularella cylindritheca ), while in the southern hemisphere, gonothecae were found in March, May, and between July and October ( Migotto 1996, as Sertularella cylindritheca ; Moura 2020; Gil & Ramil 2023b).

Distribution. Sertularelloides cylindritheca is an amphi-Atlantic species ( Gil & Ramil 2023b). In West Africa it has been recorded from Morocco ( Billard 1906a; Patriti 1970, both as Sertularella cylindritheca ) to Gabon ( Gil & Ramil 2023b). Its bathymetric distribution ranges from 0 (Grohman et al. 2003) to 614 m depth (Moura, 2011).

Our material was collected at depths between 35–96 m.

Genus Thyroscyphus Allman, 1877