Riscus austroamericanus
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Ordo: Prostigmata
Familia: Cunaxidae
Genus: Riscus
Name
Riscus austroamericanus Den Heyer – Wikispecies link – Pensoft Profile
- Riscus austroamericanus Heyer, Jacob Den, 2012, Zootaxa 3265: 36-38.
Materials Examined
Material examined:1 female holotype, Coffea arabica L., Quillabamba, Cuzco, Peru (12 ° 5 ' 19.6” S / 72 ° 42 ' 13.3” W), A.D.G. Alvarado, 04-VII- 2006; 1paratype tritonymph, Solanum nigrum L., Quillabamba, Cuzco, Peru (12 ° 5 ' 19.6” S / 72 ° 42 ' 13.3” W), A.D.G. Alvarado, 4 -VII- 2006; 1paratype female, Coffea arabica L., Quillabamba, Cuzco, Peru (12 ° 5 ' 19.6” S / 72 ° 42 ' 13.3” W), A.D.G. Alvarado, 04-VII- 2007; 1paratype female, Euterpe sp., Recife, Pernambuco, Brazil (8 ° 02' S / 40 ° 01' W), Gondim Jr, M. G. C., 5 -I- 1999, slide MZLQ3050; 1paratype female, 1paratype deutonymph, Pisidium guajava Ilhéus, Bahia, Brazil (13 ° 01'S / 40 ° 01'W), 31 -VII- 2007, A.R. Oliveira.
Description
Description. Female (Figs. 39–48) Dimensions. Idiosoma: length 394 (335–443); width 287 (246–300); length hypognathum 128 (108–135); width hypognathum 80 (77–85); length palp 108 (96–117); length chelicera 114 (94–137); length legs I 241 (219–270); II 246 (223 -285); III 287 (235–304); IV 308 (289–320); length sensillae vi 125 (116–135) and sce 155 (139–158). Dorsum (Fig. 39 a,b & 41 a–c). The demarcation of the propodosomal shield is very vague (Fig. 39 a & b). The same is true for the integumental striae. Only one very finely reticulate propodosomal shieldlike area (Fig. 41 a) on the idiosoma: it bears setal pairs ve and sci as well as sensilla pairs vi and sce (Figs 41 b&c, respectively); the latter are the longest sensillae. Except for setae sci all dorsal setae are rather short. Setae h 1 are the longest hysterosomal setae. Venter (Fig. 40 a, b). As with the dorsum hysterogastral “shields” and striae are poorly defined. Setae pcs (= paracoxal seta) occur on the median margin of coxae IV. Three pairs of hysterogastral setae. The genital area (Fig. 42) is recognised by the 5 pairs of g-setae. A pair of paragenital setae occur laterally to the anterior half of the genital region. The chelicera possesses a near terminal seta. The length ratio width:length of the hypognathum is 1: 1.5 Hypognathum (Fig. 43). The coxal region is finely papillate whereas the hypostome is longitudinally striate. Setae hg 1 are short and immediately posteriad the entomalae with its 4 small adoral setae; setae hg 2–4 are long; setae hg 4 are situated medially to setae hg 3 forming a nearly straight transverse row (Fig. 43).
Palp (Fig. 44) reaches past the entomalae with nearly the entire length of its tibiotarsusus. Its chaetotaxy is as follows: trochanter, 0; basifemur, 1 sts shorter than the segment; telofemur, 1 dorsal sts; genu, 2 sts, 1 strong, curved sts proximally and 1 straight spine-like sts; tibiotarsus, 1 ventral sts, 1 very strong median tubercle, 2 sts, 1 tsl, 1 claw. The palpal segments are finely papillate.
Legs (Figs. 45–48). Leg chaetotaxy: coxae I – IV 3 sts, 1 peg – 1 sts – 3 sts – 1 sts; trochanters I – IV 1 – 1 – 2 – 1 sts; basifemora I – IV 3 – 3 – 2 – 1 sts; telofemora I – IV 4 – 4 – 4 – 4 sts; genua I – IV {2 asl}, {1 asl, 1 sts}, 1 longish asl, 4 sts – 2 asl, 5 sts – 1 asl, 5 sts – 1 asl, 5 sts; tibiae I – IV {2 asl, 1 sts}(Fig 45 b), 4 sts – 1 asl, 5 sts – 1 bsl, 5 sts – 1 T, 3 sts; tarsi I – IV 3 asl, {1 asl, 1 sts, 1 fmls}, 1 dtsl, 2 tsl, 15 or 16 sts – 1 bsl, 1 dtsl, 1 tsl, 16 or 17 sts – 1 tsl, 14 or 15 sts – 15 or 16 sts.
Discussion
Remarks. Differences between the two known species of Riscus shown in Table 4.
Features/species R. thailandensis R. austroamericanus Genu II2 asl, 5 sts2 asl, 4 sts Tibia I{1 long bsl, 1 asl, 1 sts},4 sts{2 asl}, 4 sts Tibia II{1 asl, 1sts},4 sts1 asl, 4 sts Tibia IV1 T, 4 sts1 T, 3 sts Tarsus I3 asl,{1 bsl, 1 sts,1 fmls}, 1 dtsl, 2 tsl, 13 sts3 asl, {1 asl, 1 sts,1fmls}, 1 dtsl, 2 tsl, 15 or 16 sts Genital setae8 sts10 sts Number Solenidia*: Genua I-IV5 – 2 – 1 - 1 4 – 2 – 1 - 1Body length** (excl gnathosoma)219 (211–226)394 (335–443)Body width141 (139–142)278 (246–300)Length hypognathum83 (82–85)128 (108–135)Seta palp basifemur Longer than basifemur Shorter than basifemur *All kinds (= bsl, asl); **micrometers
Taxon Treatment
- Heyer, Jacob Den; Castro, Tatiane Marie Martins Gomes De; 2012: New Neotropical cunaxine species (Acari: Prostigmata: Cunaxidae), Zootaxa 3265: 36-38. doi
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