Sertularella ellisii (Deshayes and Milne-Edwards, 1836),

Gravili, Cinzia, Vito, Doris De, Camillo, Cristina Gioia Di, Martell, Luis, Piraino, Stefano & Boero, Ferdinando, 2015, The non-Siphonophoran Hydrozoa (Cnidaria) of Salento, Italy with notes on their life-cycles: an illustrated guide, Zootaxa 3908 (1), pp. 1-187: 131-132

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Sertularella ellisii (Deshayes and Milne-Edwards, 1836)


Sertularella ellisii (Deshayes and Milne-Edwards, 1836) 

Fig. 93View FIGURE 93 A, B

See Medel & Vervoort (1998) for a complete synonymy.

Material examined. HCUS-S 100 (Hydrozoa Collection, University of Salento—fauna of the Salento Peninsula).

Description (based on our own observations; Gili 1986; Ramil et al. 1992; Medel & Vervoort 1998):

Hydroid. Hydrorhiza tubular, as ramified stolons; colony erect; hydrocaulus monosiphonic, up to 50 mm high, irregularly branched, divided into thecate internodes by oblique nodes alternatively directed to the left and the right; hydrocladia with the same structure of hydrocauli; hydrothecae tubular, walls symmetrical, basal half swollen distal half narrower, borne laterally to the axis, alternate, one per internode and in the same plane, abcauline wall 1 / 3 adnate, aperture more or less perpendicular to the hydrothecal length axis, with 3–5 more or less developed intrathecal projections: when 5, 3 are adcaulinar (one medium, in the same axis of the marginal cusp, and 2 laterals) and 2 are abcaulinar (lateral to the cusps). Gonothecae inserted at hydrothecal base, globular, with slightly undulated perisarc over its whole length, gonothecal aperture terminal, on a short neck, surrounded by 3, occasionally 4, small cusps.

Cnidome. Microbasic mastigophores.

Habitat type. Rocky intertidal and on rocky bottoms from the tidal level to 90 m depth ( Broch 1933; García Carrascosa 1981; Boero & Fresi 1986).

Substrate. The preferential substrates are certain species of algae such as Corallina  spp., Cystoseira  spp., but it also occurs directly on Posidonia  , hydroids, rocks, sponges and ascidians.

Seasonality. January –May, August –December (Puce et al. 2009), and November ( Moura 2011) in the western Mediterranean; all year in Salento waters (De Vito 2006; this study).

Reproductive period. January –March (Puce et al. 2009); April ( Picard 1955; Gili 1986); May ( Medel et al. 1991), July –August ( Peña Cantero & García Carrascosa 2002), and November ( Rossi 1961) in several localities of the Mediterranean Sea.

Distribution. Mainly eastern Atlantic, but also records in western Atlantic and Pacific; Mediterranean (Gili 1986; Ramil et al. 1992; Medel & Vervoort 1998; Bouillon et al. 2004; Soto Ãngel & Peña Cantero 2013).

Records in Salento. Common at: Torre dell’Inserraglio, Montagna Spaccata, S.ta Caterina, Porto Badisco, Ponte del Ciolo ( Presicce 1991); Otranto (De Vito 2006; Gravili 2006; Gravili et al. 2008 a; Ventura 2011; this study).

Remarks. Sertularella fusiformis Hincks, 1861  and S. lagenoides Stechow, 1919  are conspecific with S. ellisii (Bouillon et al. 2004)  .

References. Stechow (1919) as S. fusiformis  and S. lagenoides  ; Broch (1933), Picard (1950), Rossi (1961, 1971), Chimenz Gusso & Rivosecchi Taramelli (1975), Relini & Romairone (1976), Repetto et al. (1977), Morri (1980 b, 1981 a), Boero (1981 a, b), García Carrascosa (1981), Morri & Martini (1981), Boero & Fresi (1986), Gili (1986), Ramil (1988), Ramil et al. (1992), Medel et al. (1991), Vervoort (1993), Medel & López-González (1996), Medel & Vervoort (1998), Morri & Bianchi (1999), Morri et al. (1999); Piraino et al. (1999) and Faucci & Boero (2000) both as S. gaudichaudi  ; Peña Cantero & García Carrascosa (2002), De Vito (2006), Gravili (2006), Gravili et al. (2008 a), Morri et al. (2009), Puce et al. (2009), Bianchi et al. (2011), Ventura (2011).