Xenotarsonemus kaingang, Pitton, Thafarel, Lofego, Antonio C. & Rezende, José M., 2016

Pitton, Thafarel, Lofego, Antonio C. & Rezende, José M., 2016, Three new species of Xenotarsonemus (Acari: Tarsonemidae) from the northwestern region of São Paulo State, Brazil, Zootaxa 4138 (3), pp. 534-548 : 539-543

Xenotarsonemus kaingang n. sp.

( Figs. 7–12 )

Diagnosis. Females of this species resemble those of X. biangulus by having an inconspicuously tapered tegula, and by having the tarsal solenidion ω of tibiotarsus I 5 – 6 long. It differs by having dorsal setae d shorter and by having dorsal setae sc2, c1 and d smooth. Females of this species also resemble those of X. pirassunungaensis by having the same length of the dorsal setae v1 and sc1 and by sharing the same length of the ventral setae 2a and 3a. They differ by the absence of carinae anterior to the tegula, and by the ventral setae 1a longer than X. pirassunungaensis .

Adult female (5 specimens measured).

Gnathosoma: capsule subtriangular, length 35, 36 (33 – 38), maximum width 35, 32 (30 – 35); dorsal apodeme indistinct. Setae dgs 10, 9 (8 – 11) and vgs 9, 9 (9 – 10), smooth; setae pp not observed. Palpi short, with 2 subterminal setae and terminal cone-shaped structures. Pharynx fusiform, 15, 15 long and 6, 7 (6 – 7) wide at widest region.

Idiosoma—dorsum ( Fig. 7 ): length 185, 178 (160 – 190), width at level of c1 133, 130 (127 – 135); prodorsal shield not covering gnathosoma. Stigmata mid-way between setae v1 and sc1 bases. Lengths of setae: v1 25, 23 (20 – 25), sc 1 15, 16 (15-16), sc 2 32, 29 (27 – 33), c 1 15, 15, c 2 16, 16, d 10, 11 (10 – 11), e 9, 9 (8 – 9), f 12, 13 (12 – 14), h 11, 10 (10-11). All setae serrate, except sc2, c1 and d smooth. Distances between dorsal setae: v1–v1 43, 39 (35 – 44), sc2– sc2 65, 63 (60 – 65), v1 –sc 2 15, 19 (15 – 20), c1–c1 83, 83 (80-85), c2–c2 110, 105 (100-110), c1–c2 36, 34 (32 – 36), d–d 41, 44 (40-45), f–f 19, 19, e–f 29, 23 (21 – 29), h–h 35, 35 (34 – 35).

Idiosoma—venter ( Fig. 8 ): Coxisternal setae 1a 10, 11 (10 – 11) near middle of apodeme 1, vestigial setae 1b not observed, 2a 12, 13 (12 – 13) on middle of apodeme 2, vestigial setae 2b inserted medially between posterior bases of coxisternal plate II and bases of trochanter II, 3a 15, 14 (13 – 15) near proximal extremity of apodeme 3, 3b 10, 8 (7 – 10) on posterior end of apodeme 4. Apodeme 1 conspicuous, fused to anterior end of prosternal apodeme. Apodeme 2 not fused to prosternal apodeme. Prosternal apodeme conspicuous, almost entire, but diffuse in posterior third, weakly fused to sejugal apodeme. Sejugal apodeme uninterrupted. Apodeme 3 extending diagonally from bases of setae 3a to anterior margin of trochanter III; apodeme 4 extending diagonally from anterior third of poststernal apodeme to bases of setae 3b, with only a small intermediate conspicuous portion. Poststernal apodeme conspicuous and bifurcated at anterior third, but diffuse into other portions with intermediate and posterior nodules. Coxisternal plates punctated. Tegula 11, 11 long, 5, 6 (5 – 6) wide, with tip slightly rounded. Carinae absent. All ventral setae smooth.

Legs ( Figs. 9 – 12 ): Lengths (femur to tarsus): leg I 58, 58 (57 – 59), leg II 59, 60 (59 – 60), leg III 100, 96 (90 – 102), leg IV 38, 37 (36 – 39). Number of setae (solenidia in parentheses) on femur, genu, tibia and tarsus, respectively: Leg I: 4-4-6(2)-8(1), leg II: 3-3-4-6(1), leg III: 1+3-4-6. Tarsal solenidion ω of tibiotarsus I 6, 7 (6 – 7), cylindrical and elongate, narrow near base. Sensory cluster of tibia I complete, solenidion ϕ1 4, 4 (3 – 4), slender, capitate; solenidion ϕ2 4, 4, fusiform and stout; famulus ĸ 3, 3. Setae d of tibia I 36, 36, serrate. Solenidion ω of tarsus II proximal, 4, 4 long, cylindrical and slightly elongate, narrow near base; setae pl” 5, 6 (5 – 6), spine-like and stout, inserted on middle of tarsus II. Setae d of tibia II 11, 11 (11 – 12), smooth. Femorogenu IV 23, 24 (21 – 28), tibiotarsus IV 6, 7 (6 – 7). Lengths of setae of leg IV: v’F 10, 10, v’G 11, 10 (10-11), v’Ti 29, 29 (28 – 30) and tc” 40, 40, all setae smooth.

Adult male and larval instars. Unknown.

Type material. Holotype and three paratypes from Centrolobium tomentosum (Fabaceae) , Matão, State of São Paulo, Brazil, 7/II/2008; 4/IV/2008 and 19/IV/2008. One paratype from Cardiospermum gradiflorum (Sapindaceae) , Matão, State of São Paulo, Brazil, 4/IV/2008. All deposited at DZSJRP except one paratype, 7-III- 2008, other collection data as holotype, deposited at USNM. All types are females.

Etymology. The species name kaingang refers to a Brazilian Indian tribe that occupied the region where the specimens were collected, and disappeared due to European colonization.

Figures

FIGURE 7. Xenotarsonemus kaingang (Female). Dorsum.

FIGURE 8. Xenotarsonemus kaingang (Female). Venter.

FIGURES 9 – 12. Xenotarsonemus kaingang (Female). 9, leg I; 9 ’, tibial sensory cluster; 10, leg II; 11, leg III; 12, leg IV.