Tarsonemus longisetae Lofego & Ochoa

Lofego, A. C., Ochoa, R. & Moraes, G. J., 2005, “ Cerrado ” vegetation, with descriptions of three new species, Zootaxa 823, pp. 1-27 : 16-21

Tarsonemus longisetae Lofego & Ochoa , sp. nov.

( Figs. 19–30 )

Diagnosis: Females of this new species are similar to Tarsonemus teqmen (Lin) in the shape of pharynx (elongate, slightly wider at posterior half) and by having all dorsal setae elongate, but differ by having dorsal setae sc2 longer than c1; it also differs by having 4 and 3 setae on femora I and II, respectively, while T. teqmen bears 3 and 2 setae, respectively, on those segments.

Adult female (5 specimens measured).

Gnathosoma: subelliptical in dorsal view, length 30 (30–32), maximum width 26 (25– 27); dorsal apodeme conspicuous. Setae ch 11 (11–12) and vm 8 (7–10) smooth, seta pp not observed. Palpus short, with 2 small sub­terminal setae. Pharynx elongate, slightly wider at posterior half, 16 (16–17) long and 4 wide at widest region.

Idiosoma ( Figs. 19 and 20 ): length 188 (175–225), maximum width 110 (102–125), prodorsal shield covering only base of gnathosoma. Stigma lateral, closer to base of seta v1 than to base of seta sc2. All tergites smooth. Length of dorsal setae: v1 35 (34–36), sc1 13 (13–14), sc2 98 (95–100), c1 40 (37–45), c2 43 (42–45), d 64 (60–69), e 48 (44–51), f 51 (48–54), h 39 (36–40). All setae setiform and serrate, except sc1, capitate and with tiny spines. Distances between setae: v1–v1 21 (20–24), sc2–sc2 46 (44–49), v1 –sc2 37 (35–39), c1–c1 63 (60–65) c2–c2 97 (92–100), c1–c2 26 (24–27), d–d 44 (42–45), f–f 18 (15–23), e–f 25 (24–27), h–h 34 (33–35). Seta sc1 inserted anteriorly to sc2.

Coxisternal setae 1a 12 (12–13), near junction between apodeme I and prosternal apodeme; 2a 15 (15–16), near middle of apodeme II; 3a 15 (14–15), near anterior end of apodeme III; 3b 18 (16–20), near posterior end of apodeme IV; all setae serrate. Apodeme I conspicuous, fused to anterior end of prosternal apodeme; apodeme II not fused to prosternal apodeme. Prosternal apodeme conspicuous from junction with apodeme I to level of posterior end of apodeme II, but diffuse from this point to level of sejugal apodeme; conspicuous section with median node; anterior half of diffuse section widened. Sejugal apodeme uninterrupted, in some specimens inconspicuous medially. Apodeme III extending diagonally from proximity of base of seta 3a to anterior margin of trochanter III; apodeme IV inconspicuously united to anterior region of poststernal apodeme from which it extends diagonally slightly beyond base of seta 3b. Poststernal apodeme partially inconspicuous, bifurcated anteriorly. Coxisternal plates smooth. Tegula with posterior end rounded, 10 (10–11) long and 15 (14–15) wide. Seta ps smooth.

Legs ( Figs. 21–24 ): lengths (femur to tarsus): leg I 53 (50–57), leg II 55 (52–58), leg III 64 (60–67), leg IV 45 (40–46). Number of setae (solenidia in parentheses) on femur, genu, tibia and tarsus, respectively: leg I: 4­4­6(2)­8(1), leg II: 3­3­4­6(1), leg III: 1­3­4­5. Solenidion of tarsus I 5 long, stout, wider medially. Sensory cluster of tibia I complete, solenidion 3, slender, capitate; solenidion 2 (2–3), stout; famulus k 5, inserted slightly distal to and. Seta d of tibia I 35 (35–36), smooth. Solenidion of tarsus II proximal, 4 long, stout, wider medially; seta pl´´3, inserted slightly proximal to solenidion. Seta d of tibia II 26 (25–29), serrate. Femorogenu IV 33 (30–36); tibiotarsus IV 10 (10–11). Length of setae of leg IV: v´F 13 (10–15), v´G 19 (18–21), v´Ti 34 (33–37) and tc´´97 (95–100). All setae smooth.

Adult male (5 specimens measured).

Gnathosoma: subelliptical in dorsal view, length 25 (23–28), maximum width 20 (20– 21); dorsal apodeme conspicuous. Setae ch 11 (10–12) and vm 9 (8–10) smooth, seta pp not observed. Palpus short, bearing 2 small subterminal setae. Pharynx elongate, 12 (12– 13) long and 4 (3–4) wide at widest region.

Idiosoma ( Figs. 25–26 ): length 152 (150–155), maximum width 86 (80–91). Prodorsal shield trapezoidal. Length of dorsal setae: v1 28 (26–30), v2 26 (24–28), sc1 80 (75–90), sc2 27 (21–37), c1 49 (45–54), c2 40 (33–45), d 52 (49–56), f 16 (15–18). All setae setiform and serrate. Distances between dorsal setae: v1–v1 14 (13–15), v2–v2 22 (21–23), sc1–sc1 32 (31–34), sc2–sc2 45 (44–46), v1–v2 11 (10–12), v2 –sc2 13,5 (13–15), sc1–sc2 5,5 (5–6), c2–c2 81 (80–83), c1–c1 72 (66–75), d–d 43 (41–45), c1–d 17 (16–20), c1–c2 34 (32–36), f–f 24 (22–25). Seta c1 closer to d than to c2, antero­lateral to the latter.

Coxisternal seta 1a 10 (10–11), antero­median to center of coxisternal plate 1; seta 2a 13 (10–15), near central region of coxisternal plate 2; seta 3a 16 (15–18), near anterior third of apodeme III; seta 3b 17 (16–18), near posterior third of apodeme IV. Apodeme I fused to anterior end of prosternal apodeme; apodeme II not fused to prosternal apodeme. Prosternal apodeme conspicuous between coxisternal plates I, diffuse between coxistenal plates II, extending to sejugal apodeme. Sejugal apodeme conspicuous and straight. Lines of fusion between coxae III and IV with venter of idiosoma conspicuous (apodemes III and IV, poststernal apodeme and connecting apodemes); poststernal apodeme bearing a pair of spine­shaped structures near its anterior end. All ventral plates with faint puncta. Slight transverse striae immediately anterior to sejugal apodeme.

Legs ( Figs.27–30 ): length (femur to tarsus): leg I 51 (50–53), leg II 51 (48–53), leg III 58 (56–63), leg IV 56 (50–63). Number of setae (solenidia in parentheses) on femur, genu, tibia and tarsus: leg I: 4­4­6(2)­9(1), leg II: 3­3­4­6(1), leg III: 1­3­4­4. Solenidion of tarsus I 4 (3–5), stout, wider medially. Sensory cluster of tibia I complete, solenidion 3 (2–3), capitate; solenidion short, 2,5 (2–3); famulus k 4 (4–5), inserted slightly distal to

and. Seta d of tibia I 27 (20–30), serrate. Solenidion of tarsus II proximal, (5–6) long, stout, wider medially. Seta pl´´short, 2 (2–3). Seta d of tibia II 23 (20–26), serrate.

Leg IV robust. Trochanter IV slightly wider than long, anterior margin slightly longer, 14 (11–17), than posterior 9 (8–11), seta v ´smooth, 18 (15–22) long. Femorogenu IV, 42 (38–48) long and 14 (12–15) wide at v ´F level, with anterior margin convex and posterior margin mostly concave, except for proximal fourth, without flange or projection. Seta v´F 11 (10–12), smooth; setae v'G 27 (24–32) and l"G 69 (60–75) serrate. Tibia IV 9 (8–10) long; solenidion 5 (5–6), bacilliform; seta v'Ti 39 (37–41), serrate. Tarsus IV short, bearing 3 smooth setae of following lengths: tc" 7, pv" 9 (7–10) and u' 11 (11–12). Claw well developed.

Type material: holotype female, allotype male, 2 paratype females and 5 paratype males, from unidentified plant, São Carlos, State of São Paulo, 30/IX/2002, A.C Lofego; 1 paratype female from Myrcia guianensis (Aubl.) DC., 16/V/2000, same location and collector as holotype; 1 paratype female from Psidium australe Cambess , 30/X/2000, same location and collector as holotype; all deposited at ESALQ / USP. Two paratype females and 1 paratype male, same collection data as holotype, deposited at USNM.

Etymology: the species name longisetae refers to the long dorsal setae.

Figures

FIGURE 19. Tarsonemus longisetae sp. nov. (female). Dorsal surface.

FIGURE 20. Tarsonemus longisetae sp. nov. (female). Ventral surface.

FIGURES 21 – 24. Tarsonemus longisetae sp. nov. (female). 21, leg I; 21 ’, sensorial cluster; 22, leg II; 23, leg III; 24, leg IV.

FIGURE 25. Tarsonemus longisetae sp. nov. (male). Dorsal surface.

FIGURE 26. Tarsonemus longisetae sp. nov. (male). Ventral surface.

FIGURES 27 – 30. Tarsonemus longisetae sp. nov. (male). 27, leg I; 28, leg II; 29, leg III; 30, leg IV.