Tritonia hombergii Cuvier, 1803
on 4-08-2007 in 13 metres by Jim Anderson
Tritonia hombergii Cuvier, 1803
|Classification according to Bouchet et al. (2017)|
Taxonomic source: World Register of Marine Species (AphiaID: 416648).
- Sphaerostoma jamesonii MacGillivray, 1843
- Sphaerostoma jamiesoni MacGillivray, 1843
- Tritonia alba Alder & Hancock, 1854
- Tritonia atrofusca MacGillivray, 1843
- Tritonia conifera Dalyell, 1853
- Tritonia divaricata Dalyell, 1853
- Tritonia hombergi [sic]
- Tritonia pustulosa Deshayes, 1853
It is the largest nudibranch in the Mediterranean as it can reach 20 cm in length. Its color varies from whitish to purplish brown or orange, depending on the size of the animal and its feeding, The whole body has rounded tubercles of various sizes. The frontal veil is bilobed and each lobe has numerous short fingerings. The rhinophores have digitiform extensions in their upper area and their base is surrounded by an elevated rhinophoric sheath with a widened and slightly scalloped upper edge. On the margin of the back there are 5-6 large gill branches directed upwards and smaller ones interspersed between them and projecting laterally. The foot is wide and whitish.
It lives at a certain depth, in Alcyonacean colonies. In the Atlantic coasts it feeds on Alcyonium digitatum and in the Mediterranean possibly Alcyonium palmatum. The spawn is a scalloped spirally wound cord with pink eggs of about 200 microns. When disturbed it produces a defensive secretion capable of irritating the human skin.
- Tritonia. The genus Tritonia is dedicated to Triton, in Greek mythology the god of the sea, son of Poseidon and Amphitrite, portrayed as having the head and trunk of a man and the tail of a fish.
- Homberg. Probably in honor of the German-Dutch-French chemist Wilhelm (Guillome) Homberg (1652-1715), because he is the only person known to have been active within natural history, possibly collected creatures when visiting relatives in Normandie.
It is a frequent species in northern Europe, from the Faroe Islands, Norway and the British Isles, where it is very common. It is also known from the Iberian Peninsula and in the western Mediterranean, where it is considered rare. In Catalonia it has been observed in the commercial trawling grounds off Blanes and Vilanova i la Geltrú.
| : OBIS|
: GROC 2010-2011
: Enric Madrenas
: João Pedro Silva
: Bernard Picton
| : OPK|
: Manuel Ballesteros.
: M@re Nostrum
: Altres fonts
: Marine Regions
References for the species: Tritonia hombergii
- Galicia: Rolán, Rolán-Álvarez and Ortea (1991).
Gibraltar: García-Gómez (1982).
Levante: Hidalgo (1916).
Catalunya: Ros (1975, 1978).
General: Loyning, 1927:248; Odhner, 1926a:14 as Duvaucelia hombergii; Alder & Hancock, 1855:fam. 2, pl. 2[P]; Asbjornsen, 1853:337; Bergh, 1884:705; Brown & Picton, 1979:3; Colgan, 1914:195; Cuvier, 1804:255; 1817a:4; 1817c:27; Dalyell, 1853:271; Dekker, 1989:101; Fez Sanchez, 1974:65; Forbes & Hanley, 1850-1851:582; Grieg, 1913a:4; 1914:12; Hayward, Wigham, & Yonow, 1990:708; Hoffmann, 1926:9; Hunnam & Brown, 1975:136; ICZN, 1963:272; Jeffreys, 1869:67; Johnston, 1838a:114; Larsen, 1925:12; Leach, 1852:24; Loven, 1842:363; McMillan, 1968:69; Nordsieck, 1972:65; Odhner, 1939:44; Picton & Morrow, 1994:28[P]; Pruvot-Fol, 1937:65; 1954b:348; Sauvage, 1873:32; Swennen, 1987:36; Tchang Si, 1931a:107; Thompson, 1961b:1; 1976:[P]; 1976a:[P]; 1988:108; Thompson & Brown, 1976:58; 1984:11[P]; Vayssiere, 1901a:96; 1913a:251; Walton, 1908:238
Sources: Cervera et al., 2004, Ballesteros, 2007 & 2016, McDonald, 2006 and other sources.
Tritonia hombergii mating in Lochcarron, Scotland 23/04/2018
Video by Chris Rickard (from NE Atlantic Nudibranchs forum @ Facebook)
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