The Halacarellus Capuzinus Group (Halacaridae: Acari), Diagnoses, Keys and a Description of Halacarellus Floridearum (Lohmann)

Abstract

The genus Halacarellus, with its presently known 50 species, includes several species groups. The numerically most important one is the Halacarellus capuzinus group. The capuzinus group is diagnosed. Of each of the 10 species morphological characters are outlined, together with their geographical and ecological data. The number of setae on the leg segments proved to vary, variants are listed in a table. In addition to a tabular key, with the species' characters, a dichotomous key is given. The poorly known Halacarellus floridearum (Lohmann) is described.

Annotated List and New Records of Marine and Freshwater Halacarid Mites (Halacaridae, Acari) From Norway

“…Further records. Western North Atlantic: Canada (New Brunswick), the United States (from Massachusetts to Connecticut); Eastern North Atlantic: Eire, France, the United Kingdom (Northern Ireland, Scotland, Wales); the North Sea, the Baltic (as far as Poland and northern Sweden) (Bartsch 2017).…”

“…Halacarellus capuzinus belongs to the capuzinus group (cf. Bartsch 1997aBartsch , 2017 Gnathosoma 1.5-1.7 times longer than wide. Legs slender, their length less than that of idiosoma.…”

“…Norwegian records. Bergen (Osund/Kvernepollen, Sjatien, Rosland Vaag, from low water edge) (K. Viets 1927aViets , 1928a; Tromsö (Bartsch 1978a;Bartsch and Schmidt 1979); Finmark (Gamvik) (Bartsch 2017).…”

“…North Atlantic records are from Greenland, Norway and Russia, North Sea records from the Netherlands, and the Baltic ones come from Germany, Poland, Estonia (cf. Bartsch 2017). A record from the Mediterranean (Carriglio 2010) is in need of verification.…”

“…Records from the north-western Atlantic are from the United States (Massachusetts), those from the north-eastern Atlantic, including the North Sea, the Baltic, and the Black Sea, are from the Azores, Denmark, Eire (Dublin, West Cork), France (English Channel), Germany (North Sea and the Baltic), Romania, Spain (La Coruňa), Sweden (Öresund? ), and the United Kingdom (Northern Ireland, Strangford Narrows) (Bartsch 1989a(Bartsch , 2017.…”