Amblyseius grandiporus Ferragut

Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, Zootaxa 3990 (4), pp. 525-550 : 538-540

Amblyseius grandiporus Ferragut n. sp.

( Figures 31–38 )

Diagnosis. Adult females can be recognised by the hypertrophied pre-anal pores. Dorsal shield smooth, with seventeen pairs of setae, Z4 and Z5 lightly serrated. Seta j3 longer than j1. Dorsal setal pattern 10A:9B. Seven pairs of dorsal solenostomes. Peritremes extend to j1. Sternal shield with three pairs of setae, posterior margin concave. Ventrianal shield smooth and vase-shaped. Three pairs of pre-anal setae and a pair of crescentic and hypertrophied pre-anal pores. Calyx of spermatheca saccular. Fixed digit of chelicera with two apical teeth and 15 small denticles; movable three–toothed. Genu II with seven setae. Three macrosetae on leg IV; msge and msta similar in length and longer than msti. Male ventrianal shield anteriorly convex, with four pre-anal setae. Spermatodactyl L-shaped.

FEMALE ( Figures 31–35 ) (ten females measured)

Dorsal surface. Dorsal shield smooth throughout, 380 (370–390) long, 232 (212–242) wide. Seventeen pairs of smooth and acute setae, being Z4 and Z5 lightly serrated. Seta j1 28 (23–28), j3 35 (31–35), j4 6 (5–7), j5 4 (4– 6), j6 6 (6–7), J2 9 (7–9), J5 8 (7–8), z2 12 (8–12), z4 13 (10–15), z5 5 (4–6), Z1 11 (7–11), Z4 65 (56–65), Z5 113 (97–113), s4 53 (44–53), S2 11 (10–13), S4 10 (9–11), S5 7 (7–10). Seven pairs of solenostomes; gd2 mediad and close to z4, gd9 anteromediad and close to S5. Seta r3 15 (14–18), R1 10 (10–13). Peritremes reaching setae j1.

Ventral surface. Sternal shield smooth quadrate, with three pairs of setae. Distance st1–st3 66 (65–70), distance st2–st2 73 (67–75). Seta st4 on metasternal platelets. Posterior margin of shield concave. Genital shield 78 (75–90) wide. Ventrianal shield vase-shaped, straight anteriorly, concave in the laterals; 128 (121–129) long, 87 (83–91) wide at level of ZV2, 95 (91–99) wide at level of anus. Smooth surface. Three pairs of pre-anal setae; pre-anal pores crescentic, hypertrophied and located behind and very close to setae JV2, separated 35 (32–37). Four pairs of setae surrounding the shield, JV5 smooth 48 (40–50).

Chelicerae. Fixed digit multidentate, with two strong apical teeth and 15 small and acute denticles; movable digit with three teeth.

Insemination apparatus. Calyx saccular 11 (11–13) long. Atrium C-shaped and globular.

Legs. Genu II with seven setae; 2–2/0, 2/0–1. Macroseta on genu I not very distinctive from other setae in the segment, 24 (24–26), macroseta on genu II 28 (26–31), genu III 29 (26–31), genu IV 57 (51–58), tibia IV 43 (35– 44), basitarsus IV 53 (50–56).

MALE ( Figures 36–38 ), (one male measured).

Dorsal surface. Smooth dorsal shield, 300 long, 204 wide. Nineteen pairs of setae, Z4 and Z5 serrated. Seta j1 22, j3 29 (20–21), j4 and j5 7, j6 8, J2 9, J5 7, z2 11, z4 13, z5 5, Z1 8, Z4 46, Z5 82, s4 40, S2 13, S4 8, S5 10, r3 13, R1 11. Seven pairs of dorsal solenostomes, arranged as in females. Peritremes extending between setae j1 and j3.

Ventral surface. Ventrianal shield subtriangular in shape and smooth, 138 long, 166 wide at level of anterior corners. Anterior margin strongly convex and fused with endopodals, laterals slightly concave. Four pairs of preanal setae. Pre-anal pores crescentic and hypertrophied, 26 apart. Distance between pores broader than distance between setae JV2. Four pairs of poroids. Seta JV5 32.

Chelicerae. Interior margin of digits not discernible, fixed digit multidentate. Spermatodactyl L-shaped.

Legs. Macrosetae on genu I 23, genu II 26, genu III 22, genu IV 40, tibia IV 34, tarsus IV 46.

Type material. One female holotype and nine female paratypes on Eucryphia cordifolia ; two female paratypes and one male paratype on Chusquea sp.; one female paratype on Saxegothaea conspicua . Tinquilco Lake near Pucón ( Chile); 39º 10'09" S, 71º 43'33" W; 814 m asl; 6 January 2013. Holotype and some paratypes were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain ( MNCN). Reference number of holotype: MNCN 20.02/17389; 2 male paratypes MNCN 20.02/17390.

Etymology. The name grandiporus is a compound of Latin grandis "large" and porus "pores", referring to the hypertrophied pre-anal pores in this species.

Comments. This species belongs to the nicola subgroup of the obtusus species group ( Chant & McMurtry, 2004) and is similar to Amblyseius franzellus Athias-Henriot , A. aricae Karg and A. intermedius González & Schuster , all of them described from Chile and Argentina. The new species is easily distinguished by the hypertrophied pre-anal pores. In addition, A. franzellus has six–seven denticles on cheliceral fixed digit and six pairs of dorsal solenostomes; A. aricae has longer dorsal setae, especially s4 (90 v. 48), Z4 and Z5 (110, 180 v. 60, 110) and noticeable longer macrosetae on leg IV; A. intermedius differs by having longer s4, Z4 and Z5 (72, 90, 160, respectively), eight teeth on fixed digit of chelicera and the male has five instead of four pre-anal setae.

Figures

FIGURES 31 – 35. Amblyseius grandiporus n. sp. female. 31. Dorsal shield, 32. Ventral surface, 33. Chelicera, 34. Spermatheca, 35. Genu, tibia and tarsus of leg IV.

FIGURES 36 – 38. Amblyseius grandiporus n. sp. male. 36. Dorsal shield, 37. Chelicera with spermatodactyl, 38. Ventrianal shield.