Amblydromalus macroatrium, Moraes, Gilberto José De, Barbosa, Marina Ferraz De Camargo & Castro, Tatiane Marie Martins Gomes De, 2013

Moraes, Gilberto José De, Barbosa, Marina Ferraz De Camargo & Castro, Tatiane Marie Martins Gomes De, 2013, Phytoseiidae (Acari: Mesostigmata) from natural ecosystems in the State of São Paulo, Brazil, Zootaxa 3700 (3), pp. 301-347 : 317-318

Amblydromalus macroatrium n. sp.

( Figures 21–25 )

Diagnosis. Females with dorsal shield mostly smooth, with scanty anterolateral striae; z4 about twice as long as z2; S2 longer than Z1; Z4 longer than the distance between its base and the base of Z5; spermatheca with calyx tubular and atrium elongate; ventrianal shield vase-shaped.

Specimens examined. Holotype and one paratype female from Aparisthmium cordatum Baill., Cananéia , State of São Paulo, 19 March 2001, L.V.F. Silva coll.; one paratype female from unidentified plant, Cananéia, State of São Paulo, 17 August 2002, N.C. Mesa coll., deposited at ESALQ-USP.

Description. Females (n= 3). Figures 21–25 .

Dorsum. Dorsal shield mostly smooth, with few anterolateral striae, 13 pairs of lyrifissures and five pairs of pores, 272 (270–277) long and 156 (155–157) wide. Setae j1 27 (26–29), j3 38 (35–40), j4 10 (9–11), j5 8 (8–9), j6 10 (9–10), J2 10, J5 8 (7–9), z2 19 (15–21), z4 39 (38–42), z5 9 (9–10), Z1 10 (9–11), Z4 57 (50–61), Z5 77 (75– 79), s4 62 (61–64), S2 14 (12–16), S4 11 (10–12), S5 10, r3 27 (26–28), R1 10. All dorsal setae smooth and pointed, except for Z4 and Z5, serrate and pointed.

Venter. Sternal shield mooth, except for the lateral lines at fusion with the endopodal plate, with three pairs of setae and two pairs of lyrifissures; posterior margin indistinct; distances between St1 - St3 57 (57–58), St2 - St2 66 (60–70). Genital shield smooth; distance between St5 - St5 64 (62–67). Ventrianal shield smooth, vase-shaped, 91 (90–92) long, 50 (49–50) wide at level of ZV 2 and 52 (51–52) wide at anus level, with three pairs of pre-anal setae (JV1, JV2 and ZV2); JV4, JV5, ZV1 and ZV3 on unsclerotised cuticle, and a pair of elliptical pores posteromediad of JV2. Ventral setae smooth and pointed. One pair of metapodal plates present. Peritreme extending beyond level of j1.

Chelicera. Movable cheliceral digit 29 (28–30) long, with two teeth; fixed cheliceral digit 24 (22–26) long, with nine teeth and a pilus dentilis.

Spermatheca. Calyx tubular, 15 (13–16) long, atrium elongate.

Leg macrosetae. Sge I 26 (25–26), Sge II 22 (21–22), Sge III 20 (19–20), Sti III 16 (16–17), Sge IV 53 (46–58), Sti IV 24 (23–25), St IV 52 (51–53), all pointed. Chaetotaxy: genu II: 1-2/1, 2/1-1; genu III: 1-2/1, 2/0-1

Male. Unknown.

Etymology. The name macroatrium is a compound of macro (from Greek for large) and atrium.

Remarks. Amblydromalus macroatrium n. sp. is similar to Amblydromalus higuilloae Denmark & Muma, 1975 and A. laetus . Amblydromalus higuilloae differs from this new species by having Z4 shorter than distance between its base and the base of Z5, and the following setae shorter: z4, Z4 and Z5 (20, 39 and 59 respectively). Amblydromalus laetus differs from this new species by having S2 about three times as long as Z1 and seemingly longer spermathecal calyx.

Figures

FIGURES 21 – 25. Amblydromalus macroatrium n. sp. female: 21. Dorsal idiosoma, 22. Ventral idiosoma, 23. Spermatheca, 24. Chelicera, 25. Genu, tibia and tarsus of leg IV.