Metaseiulus (Metaseiulus) parabrevicollis Ferragut

Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, Zootaxa 3990 (4), pp. 525-550 : 546-549

Metaseiulus (Metaseiulus) parabrevicollis Ferragut n. sp.

( Figures 52–61 )

Diagnosis. Female dorsal shield elongate, surface wrinkled and evenly reticulated. Dorsal setal pattern 12A:6B. Setae Z4 and Z5 thick, serrate and knobbed or spatulated; the remaining dorsal setae smooth and knobbed. Five pairs of dorsal solenostomes (gd1, gd2, gd6, gd8, gd9). Peritremes fully developed. Sternal shield with two pairs of setae. Ventrianal shield vase-shaped, with four pairs of pre-anals and a pair of gv3 pores widely separated. Calyx of spermatheca dish-shaped. Fixed digit of chelicera with two apical teeth; movable digit unidentate. Genu II with 7 setae. Leg IV with a short, curved and blunt macroseta on basitarsus. Male ventrianal shield with five pairs of preanal setae. Spermatodactyl L-shaped.

FEMALE ( Fig. 52–56 ) (seven females measured).

Dorsal surface. Dorsal shield elongate, lateral margins almost parallels between setae s4 and S5, 372 (350– 372) long, 184 (164–184) wide. Surface of the shield well sclerotised, wrinkled and distinctly reticulated. Seventeen pairs of thick, smooth and blunt setae, being Z5 serrated and Z4 and Z5 lightly knobbed. Seta r3 inserted on lateral integument, R1 on dorsal shield. Seta j1 20 (16–23), j3 22 (17–22), j4 16 (10–16), j5 16 (10–16), j6 17 (13–17), J2 20 (14–20), J5 12 (10–12), z2 18 (13–19), z3 18 (14–21), z4 20 (16–21), z5 17 (10–17), Z4 26 (20–27), Z5 36 (31–40), s4 22 (20–25), s6 22 (19–25), S5 24 (17–24), r3 22 (14–22), R1 23 (19–27). Five pairs of crateriform solenostomes (gd1, gd2, gd6, gd8, gd9). Gland opening gd1 anterolateral to j3, gd2 posteromedial to z4, gd9 medial to S5. Peritremes reaching setae j1.

Ventral surface. Sternal shield smooth, weakly sclerotised and longer than wide. With two pairs of setae. Distance st1–st3 68 (64–70), distance st2–st2 63 (54–64). Setae st3 on the integument, st4 on small metasternal platelets. Posterior margin of shield straight. Genital shield 70 (58–74) wide. Ventrianal shield vase shaped, 117 (108–118) long, 86 (75–91) wide at level of ZV2, 77 (70–77) wide at level of anus, 73 at level of constriction. Anterior surface smooth, posterior striate, with four pairs of pre-anal setae; pre-anal (gv3) pores punctiform and widely separated 32 (27–37). Distance between pores gv3 broader than distance between setae JV2. Three pairs of setae surrounding the shield. The holotype shows an additional seta between ZV1 and ZV3 on its left side. JV5 knobbed, 22 (19–25) long. Length of primary metapodal plate 33.

Chelicerae. Fixed digit with two apical teeth; movable digit unidentate.

Insemination apparatus. Calyx dish-shaped and thick–walled. Major duct broad.

Legs. Genu II with seven setae; 2–2/0, 2/0–1. Leg IV with a short, curved and blunt macroseta on tarsus 20 (18–21) long.

MALE ( Figures 57–59 ): (five males measured).

Dorsal surface. Dorsal shield 309 (302–316) long, 192 (188–196) wide. Surface striated–reticulated in anterolateral margins, weakly reticulate in the remainder of shield. Eighteen pairs of thick and blunt dorsal setae, all smooth except Z4 and Z5, which are serrate and spatulate. Seta j1 18 (17–19), j3 20 (19–21), j4 11 (10–13), j5 10 (9–12), j6 12 (12–13), J2 15 (13–16), J5 10 (9–10), z2 16 (13–17), z3 18 (16–19), z4 18 (16–20), z5 12 (11–13), Z4 23 (20–25), Z5 36 (34–39), s4 22 (21–22), s6 23 (21–24), S5 22 (20–23), r3 19 (19–20), R1 23 (21–25). Five pairs of solenostomes arranged as in female. Peritremes extending to level of setae j1.

Ventral surface. Ventrianal shield subtriangular and smooth, 127 (112–135) long, 153 (150–158) wide. Five pairs of pre-anal setae; pre-anal (gv3) pores punctiform, distance between them 29 (27–32). Seta JV5 23 (20–24).

Chelicerae. Fixed digit with two teeth, movable digit with one tooth. Spermatodactyl L-shaped, lateral projection acute.

Legs. Macroseta on tarsus IV short, curved and knobbed, 16 (15–16).

DEUTONYMPH ( Fig. 60–61 ) (five deutonymphs measured)

Dorsal shield smooth and weakly sclerotised, 285 (273–288) long, 125 (120–133) wide. Strong lateral incisions behind seta s6. Sixteen pairs of dorsal setae, all smooth and acute, except for Z4 and Z5, which are serrate and knobbed. Seta j1 15 (14–17), j3 17 (16–21), j4 12 (11–13), j5 12 (11–12), j6 13 (12–14), J2 15 (13–16), J5 10, z2 14 (12–15), z3 12 (11–14), z4 15 (13–17), z5 12 (11–12), Z4 21 (19–24), Z5 28 (25–30), s4 17 (16–19), s6 18 (17–18), S5 17 (15–21). Setae r3 and R1 located on lateral integument; r3 17 (16–17), R1 20 (19–22). Four pairs of dorsal solenostomes (gd2, gd6, gd8, gd9); pore gd6 placed inside the lateral incisions. Peritremes short, ending at level of seta z2. Five pairs of pre-anal setae. Distance between pores gv3 20 (18–22). Seta JV5 smooth and knobbed, 24 (22–25) long. Genu II with seven setae; chaetotactic formula 2 2/0 2/0 1. One curved and knobbed macroseta on basitarsus IV, 20 (20–22) long. Chelicerae with two teeth on fixed digit, unidentate on movable digit.

Type material. Holotype female, one male paratype and 2 deutonymph paratypes on Chiliotrichum diffusum (G. Forst.) Kuntze (Compositae) ; two female paratypes and one male paratype on Nothofagus antarctica and one female paratype on Gaultheria mucronata (L.f.) Hook. et Arn. ( Ericaceae ). Near Ushuaia ( Argentina); 54º 50'51" S, 68º 29'19" W; 18 m asl. 10 January 2013. Two female paratypes on Saxegothaea conspicua . Puerto Blest, Bariloche ( Argentina), near the Argentinean–Chilean border; 41º 01'10" S, 71º 09'35" W; 837 m asl. 3 January 2013. Holotype and some paratypes were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain ( MNCN). Reference number of holotype: MNCN 20.02/17397; 2 male paratypes ( MNCN 20.02/17398; MNCN 20.02/17399); 2 deutonymph paratypes ( MNCN 20.02/17400; MNCN 20.02/17401).

Etymology. The specific name parabrevicollis refers to the similarity of this new species with Metaseiulus brevicollis González & Schuster.

Comments. Metaseiulus parabrevicollis sp. n. belongs to the brevicollis species group with seta R1 inserted on dorsal shield in the female ( Chant & McMurtry, 1994) and resembles M. brevicollis . It differs by having the calyx of spermatheca dish-shaped instead of bell-shaped, seven instead of eight setae on genu II and only one macroseta on leg IV. Both species have five pairs of dorsal solenostomes, but in M. brevicollis gd1 is absent and gd5 present while in M. parabrevicollis gd1 is present and gd5 absent.

Figures

FIGURES 52 – 56. Metaseiulus parabrevicollis n. sp. female. 52. Dorsal shield, 53. Ventral surface, 54. Chelicera, 55. Spermatheca, 56. Genu, tibia and tarsus of leg IV.

FIGURES 57 – 61. Metaseiulus parabrevicollis n. sp. male and deutonymph. Adult male: 57. Dorsal shield, 58. Chelicera with spermatodactyl, 59. Ventrianal shield. Deutonymph: 60. Dorsal surface, 61. Ventral idiosoma.