Riscus
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Ordo: Trombidiformes
Familia: Cunaxidae
Name
Riscus Den Heyer, 2006 – Wikispecies link – Pensoft Profile
Historical review
Gupta and Ghosh (1980)[1] described Cunaxa bambusae, Cunaxa cynodonae Den Heyer (2006)[2] erected Riscus for Riscus thailandensis. Den Heyer (2011) transferred Cunaxa bambusae and Cunaxa cynodonae to Riscus based on the redescriptions by Corpuz-Raros (2008)[3]. Den Heyer and Castro (2012)[4] described Riscus austroamericanus.
Diagnosis
Gnathosoma. Pedipalps 5-segmented, extend beyond the subcapitulum by at least the last segment, and end in a strong claw; apophysis absent. Basifemora and telofemora complemented with simple setae; these two segments fused, although a line remains visible and they can thus be differentiated. Subcapitulum complemented with 6 pairs of setae (hg1–4 and 2 pairs of adoral setae). Setae hg3 and hg4 both near the coxal bases of the pedipalps.
Idiosoma, dorsal. Female dorsal idiosoma has a sclerotized plate that bears 2 pairs of setose sensillae (at and pt) and 2 pairs of simple setae (lps and mps). Idiosomal shield covered by integumental papillae that form a reticulated pattern. Hysterosoma lacks a plate and bears 7 pairs of setae (c1–2, d1–h1). Cupule im present, usually laterad or in the proximity of e1.
Idiosoma, ventral. Coxae ill-defined. Coxae I and II fused; coxae III and IV fused. Coxae I–IV setal formula 3-1-3-1 (including paracoxal seta). Genital plates each bear 4 setae. Anal plates bear 1 pair of setae (ps1). 2 pairs of setae (ps2 and h2) associated with, but do not occur on, the anal plates. Cupule ih present in close proximity to h2. Integument between plates striated and bears 5 pairs of additional setae. Legs. Ambulacral claws on either side of a 4-rayed empodium present.
Key to adult female Riscus
(modified from Den Heyer and Castro 2012[4])
Taxon Treatment
- Skvarla, M; Fisher, J; Dowling, A; 2014: A review of Cunaxidae (Acariformes, Trombidiformes): Histories and diagnoses of subfamilies and genera, keys to world species, and some new locality records ZooKeys, 418: 1-103. doi
Other References
- ↑ Gupta S, Ghosh S (1980) Some prostigmatid mites (Acarina) from Andaman and Nicobar Islands. Records of the Zoological Survey of India 77: 189–213.
- ↑ Den Heyer J (2006) Riscus, a new cunaxid genus from Thailand (Acari: Actinedida: Cunaxidae). Acarologia 46(3–4): 195–201.
- ↑ Corpuz-Raros L (2008) Additional species of Cunaxidae and first report of the subfamily Neobonzinae (Cunaxidae, Acari) from the Philippines. Asia Life Sciences 17(1): 71–89.
- ↑ 4.0 4.1 Den Heyer J, Castro T (2012) New Neotropical cunaxinae species (Acari: Prostigmata: Cunaxidae). Zootaxa 3265: 22–42.
