Orthopyxis crenata (Hartlaub 1901) Hartlaub 1901
- Dataset
- The non-Siphonophoran Hydrozoa (Cnidaria) of Salento, Italy with notes on their life-cycles: an illustrated guide
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Cnidaria
- class
- Hydrozoa
- order
- Leptothecata
- family
- Campanulariidae
- genus
- Orthopyxis
- species
- Orthopyxis crenata
discussion
Remarks. Cornelius (1982) suggested that O. everta could be synonymous with O. crenata.
distribution
Distribution. Circumtropical (Millard & Bouillon 1973; Medel & López-González 1996; Peña Cantero & Carrascosa 2002; Bouillon et al. 2004; Gravili et al. 2008 a; Soto Ãngel & Peña Cantero 2013). Records in Salento. Moderately frequent in Salento waters: La Strea, Porto Cesareo (Faucci & Boero 2000; Andreano 2007); Torre dell’Inserraglio, S. ta Caterina, Costa Merlata (Andreano 2007); Grotta del Ciolo (Moscatello & Belmonte 2007); Otranto (De Vito 2006; Gravili 2006; Andreano 2007; Gravili et al. 2008 a; Ventura 2011; this study).
materials_examined
Material examined. HCUS-S 119 (Hydrozoa Collection, University of Salento — fauna of the Salento Peninsula). Description (based on our own observations; Garcia Corrales et al. 1978 as Campanularia crenata; Peña Cantero & Carrascosa 2002): Hydroid. Hydrorhiza as creeping stolon system; colonies stolonal; hydranth pedicels unbranched, bearing a single distal hydrotheca, with sub-hydrothecal spherule, with thickened and, usually, undulated perisarc; hydranth with about 14 tentacles; hydrotheca bell-shaped, walls thickened to a varying extent, ring of perisarc basally separating a small spherical chamber, rim with 8 – 13 short rounded cusps varied from deep and distinct to very shallow. Gonothecae sac-shaped, truncate distally, strongly compressed laterally, perisarc irregularly undulated, borne on hydrorhiza, on short pedicels, containing 2 eumedusoids buds. Eumedusoid. Umbrella pyriform, up to 1.5 mm high, thin walls, exumbrella with 30 – 40 longitudinal meridional ridges; without manubrium; 4 radial canals closed and obliterated near apex, giving rise to numerous blindly ending side branches; circular canal narrow; gonads developed between branches of radial canals, bell cavity almost filled with sexual products; no marginal tentacles; 8 adradial statocysts. Habitat type. Littoral species that in the Mediterranean has been reported from near the tidal level to 25 m depth (García Carrascosa 1981; Boero & Fresi 1986; Gili 1986). Substrate. It is exclusively epibiontic and has frequently been reported on algae, phanerogams, bryozoans, sponges, hydrozoans, ascidians, and artificial substrata. Seasonality. April – September (Boero & Fresi 1986), and March – December (Llobet et al. 1991; Puce et al. 2009) in the western Mediterranean; April – October (De Vito 2006; this study) in Salento waters. Reproductive period. March (Stechow 1919; Gili 1986), and October – December (Llobet et al. 1991) in the western Mediterranean; October (De Vito 2006; this study) in Salento waters. Cnidome. Microbasic mastigophores.