Fungitarsonemus setillus, Sousa, Josilene M., Lofego, Antônio C. & Gondim Jr, Manoel G. C., 2014

Sousa, Josilene M., Lofego, Antônio C. & Gondim Jr, Manoel G. C., 2014, Two new species of tarsonemid mites (Acari: Tarsonemidae) from northeastern Brazil, Zootaxa 3889 (3), pp. 429-441 : 434-438

Fungitarsonemus setillus sp. nov.

( Figs. 7–12 )

Diagnosis. Female—prodorsal shield fused to tergite C (Fig. 07); dorsal setae h minute (4µm or less); setae c2, d and e short, (less than 12µm); setae c1 and f subequal and at least 3 times longer than c2. Male: dorsal setae c1 and c2 subequal and setae v2 twice as long as sc2; seta f lanceolate.

Description. ADULT FEMALE (holotype). Gnathosoma subcircular in dorsal view and circular in ventral view, length 34 (28–34), maximum width 39 (35–39), capsule about as wide as long, not beaklike anteriorly. Dorsal apodeme indistinct. Seta ch 10 (10–17) and vm 12 (11–14) smooth; seta pp not recognizable. Palpus short with 1 terminal seta and 2 terminal cone-shaped structures. Pharynx elongate-oval, 18 (18–22) long and 5 (5–6) maximum wide.

Idiosoma ( Figs. 7 and 8 ): length 172 (160–173), width at level of c1 145 (120–160); prodorsal shield normally covering gnathosoma, fused with tergite C, prodorsal ornamentation absent. Stigma adjacent to anterior margin of tubercle of sc2. Pits v2 not observed. Lengths of setae: v1 32 (30–35), sc1 16 (16–19), sc2 80 (75–100), c1 28 (27–31), c2 10 (10–11), d 8 (7–10), e 4 (4–5), f 35 (35–38) and h 3 (2–4). All setae setiform; v1, sc2, c1, d and f serrate; c2 smooth; sc1 capitate and with tiny spines. Distances between dorsal setae: v1–v1 28 (25–30), sc1–sc1 55 (48–55), sc2–sc2 60 (59–60), v1 –sc2 16 (15–18), c1–c1 60 (58–63), c2–c2 120 (120–130), c1–c2 46 (42–46), d–d 45 (39–45), f–f 17 (16–18), e–f 14 (10–14) and h–h 12 (10–12). Setae sc1 inserted posterior to sc2.

Coxisternal setae 1a 11 (10–11), near the apodeme 1; 2a 9 (8–11), near anterior end of apodeme 2; 3a 3 (3–5), placed between sejugal apodeme and apodeme 3; 3b 5 (4–6), on posterior end of apodeme 4. Apodeme 1 conspicuous, fused to anterior end of prosternal apodeme. Apodeme 2 well developed, not fused to prosternal apodeme. Prosternal apodeme uninterrupted, conspicuous from junction with apodeme 1 to junction with sejugal apodeme; sejugal apodeme well developed and uninterrupted. Apodeme 3, extending diagonally from anterior end of trochanter III to region near bases of seta 3a; apodeme 4 extending diagonally from base of seta 3b to middle part of poststernal apodeme. Coxisternal plates smooth. Tegula subtriangular 8 (6–8) long, 8 (6–9) wide; posterior margin rounded. Seta ps smooth.

Legs ( Figs. 9-12 ): lengths (trochanter to tarsus): leg I 59 (56–64), leg II 67 (61–67), leg III 88 (88–95), leg IV 41 (40–43). Number of leg setae on femur—tarsus (solenidia in parentheses): I 4–4 –5(1 φ)+6(1 ω), II 3–3 –4–5(1 ω), leg III 1 +3–4–4. Tarsal solenidion ω of tibiotarsus I 4 (4–5) long, robust and elongated. Sensory cluster of tibia I incomplete (φ 1 lacking), solenidion φ2 2 (1–2) long, robust and slightly capitate; eupathidiun k 4 (3–4) long; both inserted approximately at same level. Seta d of tibia I 15 (10–15) long, smooth. Solenidion ω of tarsus II proximal, 6 (5–6) long, stout, wider medially; seta pl absent. Seta d of tibia II 31 (30–32) long, serrate. Femurogenu IV 23 (20–25) long; tibiotarsus IV (13–16) long. Lengths of leg IV setae: v´F 11 (10–15), v´G 17 (15–19), v'Ti 15 (15–20) and tc” 31 (26–32); all setae setiform. Setae v'G, v'F and v'Ti serrate; seta tc" smooth.

ADULT MALE. (4 paratypes). Gnathosoma: subcircular in outline, length 28–31, maximum width 29–32; dorsal apodeme distinct. Setae ch 10–15, smooth, vm 9–12, smooth, pp not observed. Palpus short, bearing 1 small subterminal seta and 2 terminal cone-shaped structures. Pharynx 14–20 long and 4–5 maximum wide.

Idiosoma: ( Figs. 13 and 14 ): length 120–140, maximum width 90–110. Prodorsal shield trapezoidal. Lengths of dorsal setae: v1 40 –42, v2 13 –17, sc1 105–120, sc2 34–39, c 1 30–34, c 2 29–31, d 17–35, and f 11–13. Setae setiform and serrate, except f, leaf shaped, tricarinate, wider medially. Distances between dorsal setae: v1–v 1 16–19, v2–v 2 23–24, sc1–sc1 40–45, sc2–sc2 48– 54, v1–v2 5–6, v2 –sc 1 15–17, sc1–sc2 5–6, c1–c1 58–60, c2–c2 79–90, c1–c 2 18–21, d–d 17–20, f–f 22–23. Seta sc1 very long, anterior to sc2. Setae c1 and c2 subequal, seta c1 close to c2 than d.

Coxisternal seta 1a 10–15, in median region of coxisternal plate I; seta 2a 13–15, slightly more farther apart then 1a; seta 3a 8–9, near anterior end of apodeme 3; seta 3b 10–13 near middle of apodeme 4. Apodeme 1 fused to anterior end of prosternal apodeme; apodeme 2 fading short of fusing to prosternal apodeme. Prosternal apodeme present between coxisternal plates I and II, not fused to sejugal apodeme. Sejugal apodeme conspicuous, completely developed and uninterrupted, extending diagonally from anterior end of trochanter III to region near bases of setae 3a. Apodeme 4 uniting anteriorly with poststernal apodeme. Venter of idiosoma smooth.

Legs ( Figs. 15–18 ): lengths (trochanter to tarsus): I 70 –74, II 70 –84, III 79 –82, and IV 85 –93. Number of leg setae on femur—tarsus (solenidia in parentheses): I 4–4 –6(1) –8(1 φ), II: 3–3–4–4(1), III 1–3 –4–3. Solenidion ω of tarsus I 7–8 long, stout, wider medially. Sensory cluster incomplete (φ 1 lacking), solenidion φ2 2 long, capitate, eupathidiun k 3 long, both inserted at approximately same level. Seta d of tibia I 12–14 long, serrate. Solenidion ω of tarsus II proximal, 5–7 long, stout, wider medially. Seta pl '' not observed. Seta d of tibia II 14–16 long, smooth. Trochanter IV slightly wider than long, anterior margin slightly longer 10–21 than posterior margin 11–15. Femurogenu IV 45 –51 long and 15–17 wide at v'F level; posterior margin convex, anterior margin almost all convex, with small concavity at distal end, without projection. Seta v'F 6–8 long and v'G 34–40 long—both serrate. Tíbia IV 9–11 long, Seta v'Ti 79–83 long, smooth. Tarsus IV bearing 2 smooth setae pv'' 4 long and u' 4 long. Seta tc'' not observed. Claws well developed.

LARVA. Unknown.

Type material. Female holotype (collection number 9228), 4 female and 2 male paratypes from Annona muricata ( Magnoliales : Annonaceae ), BRAZIL: State of Pernambuco, Goiana, 7º38’16,08’’S, 34º57’9,41’’W, 23 February 2006, Coll. J. M. Sousa; 8 female and 3 male paratypes (collection numbers 9229 and 9230) from Annona muricata ( Magnoliales : Annonaceae ), BRAZIL: State of Pernambuco, Goiana, 7º38’17,63’’S, 34º57’9,04’’W, 12 December 2005, coll. J. M. Sousa; 8 female paratypes (collection number 9231) from Annona coriacea ( Magnoliales : Annonaceae ), BRAZIL: State of Pernambuco, Recife, 7º38’16,08’’S and 34º57’9,41’’W, 23 February 2006, coll. J. M. Sousa; 3 female paratypes (collection number 812 DJMS) from Annona muricata ( Magnoliales : Annonaceae ), BRAZIL: State of Pernambuco, Goiana, 7º38’17,63’’S and 34º57’9,04’’W, 15 March 2006, coll. J. M. Sousa; 6 female paratypes from Annona muricata ( Magnoliales : Annonaceae ), BRAZIL: State of Pernambuco, Goiana, 7º38’17,63’’S and 34º57’9,04’’W, 31 January 2006, coll. J. M. Sousa.

Type deposition. Holotype and 25 paratypes (20 females and 5 males) at UNESP / SJRP; 3 female paratypes at UFRPE; 5 female paratypes at USDA.

Etymology. The species name setillus refers to the short length of female setae h.

Differential diagnosis. The new species is most similar to Fungitarsonemus peregrinus ( Beer, 1954) in having all dorsal setae on the tergites relatively short (less than 50µm), similar pattern of apodemes in the female, and legs IV of the male with similar shape and length of setae. However, females of this new species can be distinguished from those of F. peregrinus by having the prodorsal shield fused to tergite C; dorsal setae h and d about 0.3 and 0.4 times as long as those of F. peregrinus , respectively; and setae c1 longer than c2 (vs. c1 shorter than c 2 in F. peregrinus ). Males of the two species can be distinguished in Fungitarsonemus setillus by having dorsal setae c1 and c2 subequal in length, and setae v2 twice longer than sc2 (vs. setae c2 about five times longer than setae c1 and setae v2 shorter than setae sc 2 in F. peregrinus ). The fusion of the prodorsal shield and tergite C also occurs in females of Fungitarsonemus pulvirosus , however, in this species dorsal setae c1, d and f are very long (more than 100µm) and whip-like.

Figures

FIGURE 7. Fungitarsonemus setillus sp. nov., female dorsum.

FIGURE 8. Fungitarsonemus setillus sp. nov., female venter.

FIGURES 9 – 12. Fungitarsonemus setillus sp. nov., female. 9, leg I, details of sensorial cluster; 10, leg II; 11, leg III; 12, leg IV.

FIGURE 13. Fungitarsonemus setillus sp. nov., male dorsum.

FIGURE 14. Fungitarsonemus setillus sp. nov., male venter.

FIGURES 15 – 18. Fungitarsonemus setillus sp. nov., male. 15, leg I, details of sensorial cluster; 16, leg II; 17, leg III; 18, leg IV.