Key to Aquatic Mites Known from Alberta RESÄ°MLÄ°

Key to Aquatic Mites Known from Alberta RESÄ°MLÄ° - Key...

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Key to Aquatic Mites Known from Alberta (created by H. Proctor, July 2006) Most illustrations have been redrawn by Heather Proctor from these two sources: Cook, D.R. 1974. Water mite genera and subgenera. Memoirs of the American Entomological Institute 21: i – 860. Smith, I.M., D.R. Cook & B.P. Smith. 2001. Water mites (Hydrachnida) and other arachnids. pp. 551 – 659 in J.H. Thorp & A.P. Covich (eds.) Ecology and Classification of North American Freshwater Invertebrates, 2 nd edition. Academic Press, San Diego. For a diagram of water mite anatomy and examples of male and female genitalia, see Appendix I. For a list of taxa see Appendix II ( including taxa that are not keyed but can be identified using sources cited above). ACARI 4 pairs of legs 3 pairs of legs larval mite – not identifiable further 1 claw at tip (tarsus) of each leg; large anal opening ( an ); adults shiny, brownish, hemispherical; juveniles pale with long terminal setae >1 claw per leg tarsus Oribatida: Hydrozetidae: Hydrozetes (there are a few other genera of aquatic oribatids that have 3 claws/tarsus; these also have large anal openings) tarsal claw adult, ventral juvenile, ventral an 2 claws per tarsus (at least on first two pairs of legs) 3 claws per tarsus; palp with one long blunt terminal seta; soft, elongate mites from lotic substrates Stygothrombioidea: Stygothrombiidae (also ‘Stygothrombidiidae’): Stygothrombium (this superfamily is sometimes included in, and sometimes excluded from, the Hydrachnidia) very small (< 1mm long), dorsoventrally flattened, diamond-shaped mites; bases of legs I and II widely separated from bases of legs III and IV not this combination of features Halacaridae (rarely recorded, but this may be due to small body size) Hydrachnidia (a.k.a. Hydrachnida, Hydracarina) water mites in the strict sense see Hydrachnidia key
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HYDRACHNIDIA eyes very close together (~ 1 eye-width apart) on same sclerotized plate in middle of ‘forehead’; soft- bodied; large red or orange mites eyes at least 2 eye-widths apart; wide array of colours and degrees of sclerotization eye-plate with long posterior projection; palps with terminal setae almost as long as palp tarsus; body clearly longer than wide eye-plate without posterior projection, shaped like a pair of eye-glasses; palps with terminal setae shorter than tarsus; body usually egg-shaped eye-plate eye-plate palp Limnocharidae: Limnochares Eylaidae: Eylais (very common) palp A A 1 B 1 C 1 BC mites without gonopores (A- C at bottom of page); often only 2 pairs of genital acetabula deutonymphs, may not be identifiable using this key mites with gonopores (arrows in A 1 -C 1 at bottom of page) examples of deutonymphal water mites (ventral) examples of adult water mites (ventral) adults genital acetabula ( ga ) clearly present around gonopore, though may be obscured behind genital flaps ( gf ); typically without sclerotized plates between hind coxae no apparent genital acetabula around gonopore; dorsum with 2 large median plates and several smaller peripheral platelets; venter with sclerotized plates between hind coxae dorsum venter Hydrovolziidae: Hydrovolzia (rare) see Hydrachnidia A ga ga gf
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Key to Aquatic Mites Known from Alberta RESÄ°MLÄ° - Key...

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