Rhizogeton nudus Broch 1910
Rhizogeton nudus Broch, 1910 Fig. 27 A–C See Schuchert (2004) for a complete synonymy. Material examined. HCUS-S 0 32 (Hydrozoa Collection, University of Salento—fauna of the Salento Peninsula). Description (based on our own observations; Calder 1988; Schuchert 2004, 2012): Hydroid. Hydrorhiza as cr...
| Main Authors: | , , , , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2015
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| Subjects: | |
| Online Access: | https://zenodo.org/record/6106992 https://doi.org/10.5281/zenodo.6106992 |
| Summary: | Rhizogeton nudus Broch, 1910 Fig. 27 A–C See Schuchert (2004) for a complete synonymy. Material examined. HCUS-S 0 32 (Hydrozoa Collection, University of Salento—fauna of the Salento Peninsula). Description (based on our own observations; Calder 1988; Schuchert 2004, 2012): Hydroid. Hydrorhiza as creeping, slightly ramified stolons; colonies stolonal; hydranths sessile, with elongated and isodiametric column, up to 2–5 mm in height, with a short collar of very thin perisarc; hypostome dome-shaped; with 14–19 filiform tentacles, scattered over distal half or distal third of hydranth body. Gonophores as fixed sporosacs with spadix, on short, perisarc-covered pedicels borne on stolons; dimorphic, males oblong ellipsoid, females ovoid to fusiform, with 3– 5 eggs and embryos developing while sticking to spadix. Colour: hydranths pinkish. Cnidome. Microbasic euryteles and desmonemes. Habitat type and substrate. Grows on a variety of substrates (algae, Posidonia, mussels, hydroids, barnacles, bryozoans), depth range 0–100 m (Boero 1981 a, b; Boero & Fresi 1986; Faucci & Boero 2000; Fraschetti et al. 2002 all as Clava multicornis). Seasonality. In the Ligurian Sea (Boero & Fresi 1986) in November; in Salento waters (De Vito 2006; this study), from March to November. Reproductive period. Unknown in the Mediterranean Sea. Distribution. Arctic and North Atlantic waters (Broch 1910; Dons 1912; Kramp 1914; Calder 1972; Antsulevich & Polteva 1986; Jones 1992; Schuchert 2001 a, 2004), Mediterranean (Gravili et al. 2008 a). Records in Salento. Rare at: Porto Cesareo (Faucci & Boero 2000; Andreano 2007); Costa Merlata (Fraschetti et al. 2002); Torre Lapillo, Torre dell’Inserraglio, S.ta Caterina (Andreano 2007); Otranto (Andreano 2007; De Vito 2006; Gravili 2006; Gravili et al. 2008 a; this study). Remarks. This species is rather inconspicuous and rare, it has been misidentified as Clava multicornis by Boero (1981 a, b), Boero and Fresi (1986). R. nudus was previously considered as restricted to arctic and ... |
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