Arhodeoporus, Camactognathus, Plegadognathus, and Winlundia are very similar in their general shape, they share numerous characters but differ in the position of the solenidion on tarsus II, and also in the number of gland pores and the chaetotaxy of the legs. Comparison with other halacarid genera proved, the position of the solenidion is stable within a species and genus, no variants are known, whereas in respect to the other characters, various states within a genus are documented. Because of differences in the position of the solenidia, the genus Arhodeoporus Newell has to be splitted. Species of Arhodeoporus s.str. have the solenidion on tarsus II dorsolateral in position; the genus includes the two species once described by Newell (1947), namely A. arenarius and A. submarinus. The other species have this solenidion on the dorsomedial flank of claw fossa. The species once referred to as the bonairensis group are moved to the re-established genus Plegadognathus, the other species are included in the new genus Maracarus. Camactognathus shares with Arhodeoporus s.str. the position of the solenidion on tarsus II but differs in other characters; the genus is solidly diagnosed. The differences between Winlundia and Plegadognathus are small, with an increase of knowledge of the species, Winlundia may turn out to be a synonym of Plegadognathus. The five genera have records from tropical and temperate coastlines but not from polar waters. Maracarus and Plegadognathus are spread all around the globe whereas Arhodeoporus s.str. and Winlundia are restricted to the north-eastern Atlantic and south-eastern Pacific, respectively.

/pdf/arhodeoporus-camactognathus-plegadognathus-and-winlundia-529dirdf2h.pdf

Arhodeoporus, Camactognathus, Plegadognathus, and Winlundia (Acari: Halacaridae), re-evaluation and geographical distribution

Thalassarachna basteri is a species widespread in the North Atlantic, in the course of an annual life cycle it runs through one larval and two nymphal instars until the adults hatch. The development of external morphological characters from the larval to adult state is described. It proved to be similar to that known about other genera. Larvae in general have smaller plates, an incomplete number of setae on the venter and the legs, and shorter legs than the following instars. The larvae of T. basteri have almost the same shape and the same number of setae on idiosoma, gnathosoma and legs as larvae of northern hemisphere genera similar in size and sharing the habitat and life-style. Beside that the larval ocular plates of T. basteri are divided into an anterior and posterior platelet, still more generic differences exist, these are outlined.

/pdf/thalassarachna-basteri-acari-halacaridae-description-of-1b4pi6ks3g.pdf

Thalassarachna basteri (acari, halacaridae), description of external characters of larva, nymphs and adults and outline of discriminating characters of larvae

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Thalassarachna basteri (acari, halacaridae), description of external characters of larva, nymphs and adults and outline of discriminating characters of larvae