Скачать или смотреть Mite (Infraorder Gamasina) on Stunned Dark-winged Fungus Gnat (Family Sciaridae) (2023-09-13)

The fungus gnat was stunned with a nitrogen-rich, oxygen-deficient atmosphere and recovered soon after with no visible ill effects. Gamasina are a major subdivision of the mesostigmatan mites including the majority of well-known species.

In members of the subgroups Parasitidae and Dermanyssiae, the modified chelicerae of males bear specialised appendages used in sperm transfer; such appendages are absent in Epicriiae and Arctacaridae. In Dermanyssiae this takes the form of a spermatodactyl, a distally-projecting process that is usually free from the movable finger; the female sperm access system opens through a pair of small solenostomes in the region of coxae III or IV.

The Epicriiae are characterised by reduction in the length of the peritremes, at least in the adult stage and sometimes in the nymphs. The dorsal shield is entire in Epicriidae but divided between podonotal and opisthonotal shields in Zerconoidea. The Arctacaridae are a group of poorly-known, heavily sclerotised mites found in high latitudes of Asia and North America with the dorsum covered by an entire shield in males but with the dorsal shield abbreviated in females (Lindquist et al. 2009b).