Belongs within: Halacaridae. Rhombognathus is a genus of halacarid mites with minute palpi and two setae each on the ocular plates (Luxton 1990). Characters (from Luxton 1990): Dorsal plates well developed; ventral plates often fused; ocular plates each with two setae; genital opening of female ventral; legs bidactylous; sclerite between end of leg and base… Continue reading Rhombognathus


Belongs within: Halacaridae. Halacarus is a genus of halacarid mites in which genu I is subequal in length to the adjoining femur and tibia (Luxton 1990). Characters (from Luxton 1990): Ocular and posterior dorsal plates may be reduced or absent; anterior epimeral plates not divided into two parts; five large dorsal pores often present; palps… Continue reading Halacarus


Belongs within: Halacaridae. Agauopsis is a genus of halacarid mites in which the first pair of legs is armed with stout, peg-like setae (Luxton 1990). Characters (from Luxton 1990): Female with three pairs of perigenital setae; moveable digits of chelicerae denticulate; palps four-segmented, penultimate segment with a spiniform seta; tibia I with unpaired spiniform setae,… Continue reading Agauopsis


Belongs within: Halacaridae. Mites of marine sands Published 27 January 2020 Mites may be the most ecologically diverse group of animals on the planet. It is something of a challenge to think of a habitat supporting complex life in which mites may not be found. Nevertheless, it can fairly be said that the marine environment… Continue reading Simognathus


Belongs within: Halacaridae. Isobactrus is a cosmopolitan genus of marine halacarid mites with the ventral armature reduced and not forming a solid shield, and a club-like seta in front of the lateral disti-dorsal seta on tarsi I and II (Newell 1947). Characters (from Newell 1947): Genital opening of female ventral in position, not guarded by… Continue reading Isobactrus


Belongs within: Trombidiformes.Contains: Copidognathus, Actacarus, Lohmannellinae, Limnohalacarinae, Isobactrus, Rhombognathus, Rhombognathides, Simognathus, Acaromantis, Agauopsis, Halacarus, Agaue, Halacarellus, Anomalohalacarus. The Halacaridae are a diverse group of aquatic mites including both marine and freshwater forms. They do not swim, but have strong tarsal claws for movement and for holding themselves in place. The majority of species are predators or algal… Continue reading Halacaridae


Belongs within: Halacaridae. Copidognathus is a large genus of primarily marine mites (though a few live in fresh water). Species are found living on a wide variety of substrates. They are distinguished by the absence of setae on the penultimate palp segment (Luxton 1990). Characters (from Luxton 1990): Female with three pairs of perigenital setae… Continue reading Copidognathus


Belongs within: Halacaridae. Anomalohalacarus is a genus of slender-bodied marine interstitial mites. Species have been recorded from the North Atlantic, Indian and Pacific Oceans. Characters (from Bartsch 2006): Idiosoma: Length 200–520 μm. Idiosoma very slender; width less than interval between epimera II and III. Dorsal and ventral plates small, delicate, lacking conspicuous ornamentation. Ocular plates… Continue reading Anomalohalacarus