The non-Siphonophoran Hydrozoa (Cnidaria) of Salento, Italy with notes on their life-cycles: an illustrated guide Author Gravili, Cinzia Author Vito, Doris De Author Camillo, Cristina Gioia Di Author Martell, Luis Author Piraino, Stefano Author Boero, Ferdinando text Zootaxa 2015 3908 1 1 187 journal article 42365 10.11646/zootaxa.3908.1.1 6f1d1977-6b97-4789-828c-76ed250cf1ae 1175-5326 242729 D6AD2B49-170B-4D9C-84AA-DBE0FEEAD8BE Sertularia perpusilla Stechow, 1919 Fig. 97 A, B See Peña Cantero & García Carrascosa (2002) for a complete synonymy. Material examined. HCUS-S 104 (Hydrozoa Collection, University of Salento—fauna of the Salento Peninsula). Description (based on our own observations; Boero 1981a ; Gili 1986): Hydroid. Hydrorhiza stolonal, colonies erect; hydrocaulus up to ca 7 mm , usually unbranched, internodes thecate excepting basal parts, separated by distinct or indistinct oblique nodes; hydrothecae opposite, touching frontally, tubular and curved outwards, forming 80º–90º angle with the axis, adcauline wall 1/2 adnate to the axis, margin with 3 cusps, 2 laterals and one abcauline, operculum with 2 valves. Gonothecae elongated-ovoid, with transverse ribs and 4 small apical cusps. Cnidome. Microbasic mastigophores. Habitat type . Littoral from 1 to about 70 m depth ( Boero 1981a ; Boero & Fresi 1986 ; Roca 1986 ). Substrate. This species is an exclusive epibiont of Posidonia oceanica . Seasonality. Present all year ( Boero & Fresi 1986 ), April ( Moura 2011; this study ), May ( Giovannetti et al. 2010 ), August ( Bianchi et al . 1993a ; Galea 2007 ), and September ( Bianchi et al . 1993a ; Galea 2007 ; Giovannetti et al. 2010 ) in several localities of the Mediterranean Sea. Reproductive period. March ( Stechow 1919 ), June ( Stechow 1919 ; Rossi 1950 ), July ( Broch 1933 ; Gili 1986), August ( Stechow 1919 ; Broch 1933 ; Peña Cantero & García Carrascosa 2002 ), and September ( Boero & Fresi 1986 ) in several localities of the Mediterranean Sea. Distribution. Endemic to Mediterranean ( Marinopoulos 1979 ; Medel & López-González 1996 ; Peña Cantero & García Carrascosa 2002 ; Bouillon et al . 2004; Soto Ãngel & Peña Cantero 2013 ). Records in Salento. Rare at Otranto (Gravili 2006; Gravili et al . 2008a ). Remarks. For more details about the ecology of this species see Peña Cantero & García Carrascosa (2002) . References. Babic (1910) as S. mediterranea ; Stechow (1919) ; Broch (1933) , Billard (1936) , Picard & Roch (1949) , Picard (1952) , Rossi (1971) , Marinopoulos (1979) , Boero (1981a , b ), Fresi et al . (1982) , Boero et al . (1985), Boero & Fresi (1986) , Gili (1986), García-Rubies (1987 , 1992 ), Roca (1987), Piraino & Morri (1990) , Hughes et al. (1991), Morri et al. (1991) , Roca et al . (1991) , Medel & López-González (1996) , Piraino et al. (1999) , Peña Cantero & García Carrascosa (2002) , Bedini et al. (2003) , Bouillon et al . (2004), Gravili (2006), Galea (2007) , Gravili et al . (2008a) , Giovannetti et al. (2010) , Moura (2011) .