Halecium tenellum Hincks 1861

• Main Authors: Gravili, Cinzia, Vito, Doris De, Camillo, Cristina Gioia Di, Martell, Luis, Piraino, Stefano, Boero, Ferdinando
• Format: Text
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Haleciidae; Halecium; Halecium tenellum; Arctic; Antarctic; Pacific; Gonzalez; Genova; Lopez; Pena; Promontorio; Vito; Antarc*; Pacific Arctic
• Online Access: https://dx.doi.org/10.5281/zenodo.6107098; https://zenodo.org/record/6107098

Halecium tenellum Hincks, 1861 Fig. 67 A–C See Peña Cantero & García Carrascosa (2002) for a complete synonymy. Material examined. HCUS-S 0 74 (Hydrozoa Collection, University of Salento—fauna of the Salento Peninsula). Description (based on our own observations; Peña Cantero & García Carrascosa 2002): Hydroid. Hydrorhiza stolonal, colonies erect; hydrocauli very thin and delicate, monosiphonic, up to 20 mm high, irregularly branched, internodes long, in a zigzag arrangement, separated by transverse nodes; hydrocladia may originate from hydrothecal base; hydrothecae shallow, walls widening from base to top giving a wide aperture, rim everted and curved outwards, borne laterally at upper part of internodes, alternate and provided with a well developed hydrophore, secondary hydrothecae provided with hydrophore, may arise from primary hydrothecae. Gonothecae: male gonothecae ovate and flattened, female similar but slightly larger and broader. Cnidome. Microbasic euryteles and mastigophores. Habitat type. Eurybathic species that has been found from 0.5 to 200 m depth (Marinopoulos 1979; Boero & Fresi 1986). Substrate. Algae, hydroids, concretions, Posidonia , bryozoans, polychaete tubes, anthozoans, sponge. Seasonality. April (Picard 1955; Gili 1986), May (Medel et al . 1998), and October–March, July (Boero & Fresi 1986) in the western Mediterranean; June, July (De Vito 2006; this study) in Salento waters. Reproductive period. April (Picard 1955; Gili 1986) and May (Medel et al . 1998) in the western Mediterranean. Distribution. Cosmopolitan species present in the eastern and western Atlantic, Mediterranean, Indo-Pacific, Arctic, Antarctic (Broch 1918 in part as Halecium textum Stepan’yants 1979; Ramil & Vervoort 1992; Medel & López-González 1996; Medel et al . 1998; Peña Cantero & García Carrascosa 2002; Bouillon et al. 2004; Gravili et al . 2008 a; Soto Ãngel & Peña Cantero 2013). Records in Salento. Rare at Otranto (De Vito 2006; Gravili 2006; Gravili et al . 2008 a; this study). Remarks. It is not always easy to distinguish the European Halecium species H. mediterraneum , H. labrosum , and H. tenellum (for details see Schuchert 2005 b). The distinctive characteristics of H. tenellum are that the colonies are more gracile, non-polysiphonic and smaller than those of the other two species, with internodes more elongate, strongly arranged in a zigzag manner. References. Motz-Kossowska (1911), Broch (1912, 1933), Stechow (1919), Leloup (1934), Picard (1958 a), Rossi (1961), Patriti (1970), Boero (1981 a, b), Fresi et al. (1982), Boero & Fresi (1986), Gili (1986), Llobet et al. (1986, 1991), Llobet i Nadal (1987), Ramil & Vervoort (1992), Medel & López-González (1996), Migotto (1996), Medel et al. (1998), Piraino et al . (1999), Medel & Vervoort (2000), Peña Cantero & García Carrascosa (2002), Bouillon et al. (2004), De Vito (2006), Gravili (2006), Gravili et al . (2008 a), Puce et al . (2009). : Published as part of 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, pp. 1-187 in Zootaxa 3908 (1) on pages 96-97, DOI: 10.11646/zootaxa.3908.1.1, http://zenodo.org/record/242729 : {"references": ["Pena Cantero, A. L. & Garcia Carrascosa, A. M. (2002) The benthic hydroid fauna of the Chafarinas Islands (Alboran Sea, western Mediterranean). Zoologische Verhandelingen Leiden, 337, 1 - 180.", "Marinopoulos, J. (1979) Distribution des Eudendrium dans la region Marseillaise. Etude preliminaire. Rapports et Proces Verbaux des Reunions, Commission Internationale pour l'Exploration Scientifique de la Mer Mediterranee, 25 - 26 (4), 117 - 118.", "Boero, F. & Fresi, E. (1986) Zonation and evolution of a Rocky bottom hydroid community. 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