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Raphignathoidea
Raphignathoidea is a superfamily of the Acari (mite) order Trombidiformes, comprising 1087 species in 62 genera and 12 families. Morphology Adult Raphignathoidea are generally oval or round in shape, with 2 pairs of vertical setae on the prodorsum (rarely 3), 2 pairs of scapular setae (rarely 1 or 3), and eyes and postocular bodies usually present. The second and third leg pairs are separated by a gap except in families Cryptognathidae and Raphignathidae. The legs usually bear tarsal claws at the ends. Females and males look similar except that males are often tapered posteriorly, the first and second pseudanal setae are often reduced, the genital and anal openings are fused, and an aedeagus (male reproductive organ) is present. Life cycle Most Raphignathoidea have five life stages: egg, larva, protonymph, deutonymph and adult. The species ''Agistemus exsertus'' also has a prelarval stage, while the genus ''Raphignathus'' and the family Xenocaligonellididae also have a th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stigmaeidae
Stigmaeidae is a family of prostigmatan mites in the order Trombidiformes. At over 600 species, it is the largest family in superfamily Raphignathoidea. It has a worldwide distribution. Description As mites, Stigmaeidae have unsegmented bodies with eight legs (six in larvae). They can be recognised by: prodorsum without transversal groove, sacs or tubes; suranal and aggenital shields separate; cheliceral bases usually separate (rarely fused or conjunct); palps stout with tibial claws at least 1/3 length of tarsus; peritreme absent. Males differ from females in being somewhat tapered posteriorly. Life cycle The stigmaeid life cycle has the five stages of egg, larva, protonymph, deutonymph and adult. The larva and two nymph stages are also each followed by a quiescent period. The whole life cycle takes no more than four weeks. Males usually reach adulthood slightly faster than females, allowing them to mate with females as soon as the latter have reached adulthood. Offspr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dytiscacaridae
''Dytiscacarus'' is a genus of Trombidiformes, trombidiform mites that are sub-elytral parasites of diving beetles (Dytiscidae). It is in the Monotypic taxon, monotypic Family (biology), family Dytiscacaridae, and comprises three species. It has been recorded from Iran and the United States. Morphology The family has three distinctive features not found in other mites (Autapomorphy, autapomorphies): the infracapitulum has a pair of gnathosomatic neostigmata on its dorsal face, the movable Chelicerae, cheliceral stylets are sheathed and can be deeply retracted into the Cephalothorax, prosoma, and the pretarsi of all legs lack empodia and bear paired claws strongly modified into sclerotized tenent-like structures (to attach to hosts). These features occur in all of the active life stages. Dytiscacaridae are also Sexual dimorphism, sexually dimorphic: females have the fourth pair of legs elongated (possibly for greater mobility), while males have a caudal copulatory capsule. Biol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |