Daidalotarsonemus esalqi, Rezende & Lofego & Ochoa, 2015

Rezende, J. M., Lofego, A. C. & Ochoa, R., 2015, Two new species of Daidalotarsonemus (Acari: Prostigmata: Tarsonemidae) from Brazil, Acarologia 55 (4), pp. 435-448 : 436-441

Daidalotarsonemus esalqi n. sp.

( Figures 1-4 )

Diagnosis — Females of this new species are most similar to Daidalotarsonemus venustus Attiah (1970) by the reticulated ornamentation on tergite C and by the similar length of the dorsal setae v1, sc2, c1, c2 and h. However, they differ by having the ornamentation pattern on tergite D reticulated only between setae d for D. esalqi ; by the length of palps, longer for the new species; by pharynx shape, larger for D. esalqi ; and by the shape, length and width of the posterior setae d, e and f, all smaller for this new species.

Adult female (three specimens measured).

Gnathosoma — covered by the prodorsum, subtriangular in ventral view, length 34 (32 – 36), maximum width 24 (23 – 26); dorsal apodeme distinct. Setae dgs 10 (9 – 11) and vgs 7 (7 – 8) smooth; palps long 17 (17 – 18), with one small subterminal seta. Pharynx fusiform, 14 (13 – 16) long and 8 (7 – 10) wide at maximum width.

Idiosoma - dorsum ( Figures 1 and 4 ): length 201 (198 – 207), width at level of c1 97 (95 – 102). Stigma located near lateral notch of prodorsal shield, which is equidistant to the v1 and sc2 setal bases. Prodorsum with regular ornamentation covering it; tergite C with three transverse central rows of reticula and irregular ridges around it; tergite D with three central rows of reticula and irregular ridges around setae d. Lengths of the setae: v1 25 (22 – 27), sc1 13 (13 – 14), sc2 27 (24 – 30), c1 18 (16 – 21), c2 17 (16 – 18), d 25 (24 – 26), e 13 (12 – 14), f 25 (24 – 27) and h 12 (11 – 13). Maximum width of expanded setae: d 5, e 3 and f 7. All dorsal setae serrate; except for c1 and c2 smooth. Setae v1, c1, c2, d, e and f inserted on tubercles. Setae v1, sc2, c1, c2 and h setiform; setae d, e and f lanceolate with two central serrate veins. Distances between dorsal setae: v1-v1 28 (25 – 31), sc2-sc2 45 (42 – 48), v1-sc2 29 (27 – 31), c1-c1 50 (48 – 52), c2-c2 97 (94-101), c1-c2 41 (40 – 44), d -d 43 (42 – 44), f -f 10 (10 – 11), e -f 15 (15 – 16) and h -h 16 (14 – 17). Seta sc2 inserted posterolateral to sc1.

Idiosoma - venter ( Figure 2 ) — setae 1a 9 (9), posteriad of apodemes 1; 2a 10 (10 – 11), posterolaterad of apodeme 2; 3a 13 (12 – 15) near anteriomedial margins of apodemes 3; 3b 11 (10 – 12) on posterior margins of apodemes 4. Apodeme 1 conspicuous, fused to anterior end of prosternal apodeme. Apodeme 2 long but not fused to prosternal apodeme. Prosternal apodeme conspicuous from junction with apodeme 1 to the proximal end of the apodeme 2, and diffuse from this point to the sejugal apodeme. Sejugal apodeme uninterrupted, with a median furrow. Apodeme 3 with a constriction near the anterior end, extending diagonally from proximity of base of seta 3a to anterior margin of trochanter III; apodeme 4 extending diagonally from the middle of the poststernal apodeme to base of seta 3b. Poststernal apodeme bifurcated anteriorly. Tegula wide 25 (23 – 26) and very short 5 (5); posterior margin slightly arched. Setae ps 15 (15 – 16) serrate.

Legs ( Figure 3 ) — lengths (femur to tarsus): leg I 57 (54 – 61), leg II 50 (48 – 52), leg III 84 (81 – 88). Number of setae (solenidia in parentheses) on femur, genu, tibia and tarsus, respectively: leg I: 3-4-5(2)-7(1), leg II: 3-3-4-4(1), leg III: 3-4-4. Tarsal solenidion ω of tibiotarsus I 5 (5-6), stout, wider medially. Sensory cluster of tibia I complete, solenidion φ1 3 (3 – 4), slender, capitate; solenidion φ2 3 (3), robust, slightly capitate; famulus k 5 (5 – 6); all inserted at approximately the same level. Seta d of tibia I 21 (20 – 24), serrate. Solenidion ω of tarsus II proximal, 4 (4) long, stout, wider medially. Seta d of tibia II 21 (19 – 24), serrate. Femorogenu IV 16 (15 – 17); tibiotarsus IV 10 (9 – 11). Length of leg IV setae: v’ F 6 (6 – 7), v’ G 10 (10 – 11), v´ Ti 18 (17 – 20) and tc" 45 (45 – 46); all setae smooth, except for v’ Ti serrate; v’ Ti falcate.

Adult male and larva — Unknown.

Type material — Holotype and two paratypes. Holotype and paratypes from Hevea brasiliensis L. ( Euphorbiaceae ), 47°38’W 22°42’S, Universidade de Sªo Paulo, Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ/USP), Piracicaba, State of Sªo Paulo, 02/X/2002, R.M.J. De Vis. Holotype deposited at ESALQ/USP; and paratypes deposited at DZSJRP.

Etymology — the name esalqi is in honor of the university where this species was first registered. ESALQ is the acronym for Escola Superior de Agricultura "Luiz de Queiroz".

Figures

FIGURE 1: Daidalotarsonemus esalqi n. sp. (female): Dorsal surface of the idiosoma.

FIGURE 2: Daidalotarsonemus esalqi n. sp. (female): Ventral surface of the idiosoma.

FIGURE 3: Daidalotarsonemus esalqi n. sp. (female). Legs: A – leg I; B – leg II; C – leg III; D – leg IV.

FIGURE 4: Daidalotarsonemus esalqi n. sp. (female): Dorsal micrograph of the idiosoma.