Náttúrufræðingurinn

Ukioqatigiit

Náttúrufræðingurinn - 1977, Qupperneq 21

Náttúrufræðingurinn - 1977, Qupperneq 21
Jónsson, Lúðvik. 1971: Skeldýranýjungar. Náttúrufr. 41: 41—47. Muus, B. J. 1963: Some Danish Hydro- biidae with the description o£ a new species Hydrobia neglecta. Proc. Malac. Soc. London 35: 131—138. Muus, B. J. 1967: The fauna of Danish estuaries and lagoons. Distribution and ecology of dominating species in the shallow reaches of the mesohaline zone. Meddelelser fra Danmarks Fisk- eri- og Havundersögelser. Ny serie 5 (1): 1-316. S U M M A R Y Hydrobia ventrosa recorded in Iceland by Ingimar Óskarsson, Marine Research Institute, Reykjavik, Agnar Ingóljsson and Arnthor Gardarsson, Institute of Biology, TJniversity of Iceland. Hydrobia ventrosa (Montagu, 1803) (Prosobranchia, Gastropoda) is recorded as new to Icelancl. An earlier record o£ Hydrobia idvae in Iceland (Jónsson 1971) should be regarded as probably relerring to H. venlrosa. The species is now known to have a wide but local distribution along the west and southwest coasts of lceland (Fig. 1). In Iceland H. ventrosa is found in brackish ponds (often with Ruppia mari- tima) in Puccinellia salt marshes at sal- inities varying from to 26.4%0, inter- tidal lagoons, and in mucl flats with higher and less variable salinities of about 33%0. At some of the localities the species is very abundant (up to 23,000 individu- als/m2). Large numbers of live II. ventrosa from most of the known Icelandic localities were examined. All agreed well witli European descriptions of this species in structure of shell (Fig. 2), penis (Fig. 3) and radula. Comparison of live Icelandic material with a detailed description of the North American Hydrobia totteni Morrisson (Davis 1966) revealed no dif- ferences in anatomy, but Davis’s descript- ion was more detailed than any in the European literature. In particular, the Icelandic specimens were characterized by ciliary ridges on the outer edge of the left antenna (Fig. 4). Examination of live Danish and Norwegian specimens ol' H. ventrosa revealed that these also had idcntical ciliary ridges not previously de- scribed in II. ventrosa, but considered diagnostic of H. totteni (Davis loc. cit.). We therefore consider tlie North Ameri- can Hydrobia totteni Morrison 1954, syn. H. minuta (Totten, 1834), synonymous with H. ventrosa. This species, therefore, has a wide boreal amphi-atlantic distribu- tion. Icelandic populations vary considerably in pigmention (Fig. 4) and in size. The largest and darkest specimens were found in brackish pools at Álftanes (Gálga- hraun), SW-lceland, and the smallest and least pigmented in intertidal lagoons at Stokkseyri on the south coast. 15
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