Typhlodromips fissuratus Ferragut

Ferragut, Francisco & Navia, Denise, 2015, Phytoseiid mites (Acari: Phytoseiidae) from Patagonia and Tierra del Fuego, Zootaxa 3990 (4), pp. 525-550 : 536

Typhlodromips fissuratus Ferragut n. sp.

( Figures 26–30 )

Diagnosis. Female dorsal shield mostly smooth, with striae on the lateral margins and weak polygonal cells between setae j6 and Z4. Dorsal setal pattern 10A:9B. Seventeen pairs of dorsal setae, Z4 and Z5 serrated. Seven pairs of dorsal solenostomes. Peritremes broad and extending to j1. Sternal shield with three pairs of setae, posterior margin straight or slightly concave. Ventrianal shield vase-shaped, with three pairs of pre-anal setae and pores gv3 punctiform. Calyx of spermatheca saccular; atrium fissured at the junction with major duct. Genu II with seven setae. Three short macrosetae on leg IV.

FEMALE ( Figures 26–30 ) (three females measured).

Dorsal surface. Central area of dorsal shield mostly smooth, striate in the margins, delicately reticulated between j6 and Z4, posterior region behind Z4 smooth. Length 430 (410–432), width 240 (228–240). Seventeen pairs of smooth setae, except Z4 and Z5 which are serrated. Seta j1 30 (27–30), j3 33 (27–33), j4 17 (14–18), j5 16 (14–16), j6 20 (18–20), J2 24 (23–24), J5 11 (11–14), z2 24 (20–25), z4 23 (23–25), z5 15 (14–18), Z1 27 (24–27), Z4 48 (42–48), Z5 68 (60–68), s4 39 (36–39), S2 28 (27–30), S4 21 (17–23), S5 21 (17–21), r3 27 (18–27), R1 22 (18–22). Seven pairs of solenostomes; gd1 between j3–z2, gd2 mediad and close to z4, gd5 posteromediad to z5, gd9 anteromediad and close to S5. Peritremes broad, extending to setae j1.

Ventral surface. Sternal shield wider than long, distance st1– st3 70 (68–70), distance st2–st2 75 (75–78). Surface smooth, posterior margin lightly concave, with three pairs of setae. Seta st4 on metasternal platelets. Genital shield 79 (79–82) wide. Ventrianal shield vase-shaped, with anterior margin straight and laterals concave; 126 (126–130) long, 103 (94–103) wide at level of ZV2, 86 (84–88) wide at level of concavity. Surface striated; two lateral areas of muscle marcs on the posterior margin, at the level of anus. Three pairs of pre-anal setae; preanal (gv3) pores punctiform, distance between them 20 (20–21). Distance between pores gv3 narrower than distance between setae JV2. Four pairs of setae around the shield, JV5 37 (35–41). A pair of large pores associated with JV5.

Chelicerae. Fixed digit with seven teeth (two strong apical teeth plus five denticles), movable digit with three well separated teeth.

Insemination apparatus. Calyx saccular, 18 (17–18) long. Atrium C-shaped, major duct broad. At the junction with the duct the atrium is distinctly fissured.

Legs. Genu II with seven setae; 2–2/0, 2/0–1. Macrosetae on genu I and genu II scarcely differentiated, on genu III 23 (22–23). Three short, stout and blunt macrosetae on leg IV, macroseta on genu IV 37 (32–37), tibia IV 27 (24–28) and basitarsus IV 33 (32–33).

MALE. Unknown.

Type material. Holotype female and one female paratype on Rubus sp. ( Rosaceae ), Tinquilco Lake near Pucón ( Chile); 39º 10'09" S, 71º 43'33" W; 814 m asl (above sea level); 6 January 2013; one female paratype on Nothofagus dombeyi, 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 one paratype were deposited at Museo Nacional de Ciencias Naturales, Madrid, Spain ( MNCN). Reference number of holotype: MNCN 20.02/17388.

Etymology. The Latin name fissuratus derives from fissura "cleft" and refers to the junction between the major duct and the atrium in the spermatheca, an unusual character within the genus Typhlodromips .

Comments. The habitus of this species resembles of that T. valdiviensis . It can be differentiated by the female insemination apparatus, with a fissured or vacuolated atrium in T. fissuratus ; by the relative length of setae j1–j3, being similar in T. fissuratus (j 1 27–30; j 3 27–33) and j3 much longer in T. valdivianus (j1 32–34; j3 42–44) and by the length of macrosetae on leg IV, shorter in T. fissuratus (msgeIV 32–37; mstiIV 24–28; mstaIV 32–33) than in T. valvidianus (msgeIV 48–53; mstiIV 45–48; mstaIV 47–51). In addition, the female dorsal surface shows striated and faintly reticulated areas in T. fissuratus while in T. valdivianus is completely smooth. Typhlodromips fissuratus also differs from T. fordycei by its saccular rather than funnel-shaped calyx with a bulbous atrium. Typhlodromips compressus has the genital shield as wide as the ventrianal and only one macrosetae on leg IV instead of ventrianal wider than genital and three macrosetae on leg IV in the case of T. fissuratus .

Figures

FIGURES 26 – 30. Typhlodromips fissuratus n. sp. female. 26. Dorsal shield, 27. Ventral surface, 28. Chelicera, 29. Spermatheca, 30. Genu, tibia and tarsus of leg IV.