Dactyloscirus saopauloensis Den Heyer

Heyer, Jacob Den & Castro, Tatiane Marie Martins Gomes De, 2012, New Neotropical cunaxine species (Acari: Prostigmata: Cunaxidae), Zootaxa 3265, pp. 22-42 : 33-35

Dactyloscirus saopauloensis Den Heyer sp. nov.

Material examined: 1 female holotype, sunflower residue, Dept of Entomology, Phytopathology and Agricultural Zoology, ESALQ, Piracicaba-SP., Brazil, 14-XI-2007,

J. Den Heyer.

Description.

Female. ( Figs. 31–38 ). Dimensions. Idiosoma : length 585; width 405 (fairly distended); length hypognathum 312; width hypognathum 119; length palp 323; length chelicera 262; length gnathosoma 470; length legs: I 443, II 385, III 447–450, IV 497–501; length sensillae vi approximately 270, sce 250; ovum 146 x 216.

Dorsum ( Fig. 31 ). The reticulate propodosomal shield ( Fig. 31 a) carries four pairs of setal structures: the two pairs of sensillae vi and sce ( Figs 31 b & c) and the st-setae ve and sci. Distance sci-sci smaller than sci-sce. Setae ve very close to sce; the length of the latter are less than half the distance between them. Two small lateral hysterosomal “shields”. Except for setae f2 the usual pairs of hysterosomal setae are present; setae h1 longest, followed by f1. Other setae all about equal length.

Venter ( Fig. 32 ). The venter of this specimen is torn. The venter is normal for the genus. The genito-anal region ( Fig. 32 ) carries 4 pairs of g- setae on the genital valves with g3 laterad to line g1 - g2 - g4, one pair of anal setae on anal valves, one pair of para-anal setae and 1 pair of cupules ih on the integument between the two regions. A paragenital seta occurs laterad to each genital valve.

Gnathosoma ( Figs. 33–35 ). The gnathosomal components are very much extended as compared to those of Dactyloscirus condylus Den Heyer, 1979 .

Hypognathum ( Fig. 33 ). Ratio length: width of the hypognathum is 2.9:1.

Palp ( Fig. 34 ). The palp chaetotaxy is: trochanter 0, basi- and telofemur 1 dorsal spine-like seta each, telofemur also with a median small apophysis, genu with a small median apophysis, 2 sts and a distal spine, tibiotarsus with 1 ventromedian seta, 1 tubercle, 2 small setae, 1 terminal solenidion and a terminal claw.

Chelicerae ( Fig. 35 ). This structure is nearly needle-like. Proximodorsal region of segment II with papillae in reticulate pattern. Segment I with random papillae.

Legs ( Figs. 36–38 ) Tibiae I nearly twice the length of genua I. Leg setae vary from thin sts to stout macrosetae. Leg chaetotaxy: coxae I– IV 3 sts, 1 peg – 2 – 3 – 2 sts; trochanters I–IV 1 – 1 – 2 – 1 sts; basifemora I–IV 5 – 5 – 3 – 2; telofemora I–IV 5 – 5 – 4 – 4; genua I–IV 2 asl (very close but not duplex), 1 asl, {asl, 1 sts} 4 sts – 2 asl, 5 stout sts – 1asl, 1 stout ms, 4 stout sts – 2 asl, 5 sts (almost all stout); tibiae I – IV {1 asl, 1 sts}, 1asl, 4 sts – 1 bsl, 5 sts – 1 bsl, 5 sts (all stout) – 1T, 4 sts(3 of these stout); tarsi I – IV 3 asl, {1 bsl, 1 sts, 1fmls}, 1 dtsl, 2 tsl, 18 sts (of which 3 are spinose and situated ventrally on the anteromedian aspect) – 1 bsl, 1 dtsl, 1 tsl, 21 sts – 1 tsl, 21 sts – 20 sts.

Remarks. This species closely resembles Dactyloscirus smileyi Swift, 1996 with relation to size and other aspects. Differences, however, are given in Table 3 .

Figures

FIGURES 31 - 36. Dactyloscirus saopauloensis Den Heyer & Castro sp. nov. Female. Dorsum (31 a); sensillum vi (31 b); sensillum sce (31 c); genital region (32); hypognathum (33); palp (34); chelicera (35); Leg I (36) UMB = 100 μm.

FIGURES 37 - 38. Dactyloscirus saopauloensis Den Heyer & Castro sp. nov. Female. Leg II (37); dorsal sts on trochanter III (38 a); dorsal sts on basifemur III (38 b); dorsal sts on telofemur III (38 c). UMB = 100 μm.