Breviseius, 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 : 336

Genus Breviseius n. gen.

Type species. Breviseius sennae n. sp., by original designation.

Diagnosis. Females and males with dorsal shield setae uniformly short; seta z3 absent and s6 present; fixed cheliceral digit with few teeth, short JV5, and no leg macrosetae; sternal shield of female reduced, bearing only St2 and two pairs of lyrifissures; St1 on unesclerotised cuticle; St3 inserted on separate platelets; ventrianal shield reduced, bearing a pair of pre-anal setae (JV2) and a pair of pores; setae JV3 and ZV3 absent.

Adult female. Dorsum of idiosoma with 19 pairs of setae, including seven setae of the j - J series (j1, j3 – j6, J2, J5), five setae of the z - Z series (z2, z4, z5, Z4 and Z5), five setae of the s - S series (s4, s6, S2, S4 and S5) and two setae of the r - R series (r3 and R1). Dorsal idiosomal setae short and smooth. Dorsal shield mostly smooth, with anterolateral reticula. Sternal shield of female reduced, bearing only St2 and two pairs of lyrifissures; St1 on unesclerotised cuticle; St3 inserted on separate platelets; St 4 set on metasternal shields. With six pairs of opisthogastric setae (JV1, JV2, JV4, JV5, ZV1 and ZV2) in addition to circumanals. Ventrianal shield reduced, ovoid, with a single pair of pre-anal setae (JV2) and a pair of pores. With two pairs of metapodal plates, both of each side almost in line. Peritreme extending almost to the level of j1. Fixed and movable cheliceral digits with three and two teeth respectively. Leg macrosetae absent.

Adult male. Chaetotaxy of dorsum of idiosoma, relative lengths and shape of dorsal idiosomal setae and pattern of dorsal shield similar to female, except for that r3 and R1, inserted on dorsal shield. Only three pairs of pre-anal setae (JV1, JV2 and ZV2); short JV5. Spermatodactyl L-shaped. No leg macrosetae.

Etymology. Breviseius is a compound of brevis (Latin for short) plus seius (a Roman surname commonly used to compose names of mesostigmatic mites), referring to the short dorsal shield setae of the type species of this genus.

Remarks. Breviseius n. g. fits the characterisation of the tribe Galendromimini, described by Chant & McMurtry (1994). Within this tribe, the presence of S4 and S5 is shared with Cydnoseius Muma ; the absence of Z1 is shared with Silvaseius Chant & McMurtry ; the elongate tubular-like spermathecal calyx and the small number of teeth on the fixed cheliceral digit are shared with Silvaseius and Galendromimus (Galendromimus) .

Those groups differ from Breviseius by the following characteristics: Cydnoseius – presence of Z1 and ZV3; Z5 distinctly longer than other dorsal setae; calyx of spermatheca dish-shaped; presence of macroseta on tarsus of genu IV; Silvaseius – z4 inserted mesad its usual position; absence of S2 and S4; j3, s4, s6, Z4 and Z5 distinctly longer than other dorsal setae; fixed cheliceral digit multidentate; legs III and IV with macrosetae; Galendromimus (Galendromimus) – Z1 and JV3 present; Z4 and Z5 elongate and serrate; fixed cheliceral digit multidentate and peritreme extending to the level of r3.