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 z 3 absent and s 6 present; fixed cheliceral digit with few teeth, short JV 5, and no leg macrosetae; sternal shield of female reduced, bearing only St 2 and two pairs of lyrifissures; St 1 on unesclerotised cuticle; St 3 inserted on separate platelets; ventrianal shield reduced, bearing a pair of pre-anal setae (JV 2) and a pair of pores; setae JV 3 and ZV 3 absent.

Adult female. Dorsum of idiosoma with 19 pairs of setae, including seven setae of the j - J series (j 1, j 3 – j 6, J 2, J 5), five setae of the z - Z series (z 2, z 4, z 5, Z 4 and Z 5), five setae of the s - S series (s 4, s 6, S 2, S 4 and S 5) and two setae of the r - R series (r 3 and R 1). Dorsal idiosomal setae short and smooth. Dorsal shield mostly smooth, with anterolateral reticula. Sternal shield of female reduced, bearing only St 2 and two pairs of lyrifissures; St 1 on unesclerotised cuticle; St 3 inserted on separate platelets; St 4 set on metasternal shields. With six pairs of opisthogastric setae (JV 1, JV 2, JV 4, JV 5, ZV 1 and ZV 2) in addition to circumanals. Ventrianal shield reduced, ovoid, with a single pair of pre-anal setae (JV 2) 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 j 1. 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 r 3 and R 1, inserted on dorsal shield. Only three pairs of pre-anal setae (JV 1, JV 2 and ZV 2); short JV 5. 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 S 4 and S 5 is shared with Cydnoseius Muma ; the absence of Z 1 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 Z 1 and ZV 3; Z 5 distinctly longer than other dorsal setae; calyx of spermatheca dish-shaped; presence of macroseta on tarsus of genu IV; Silvaseius – z 4 inserted mesad its usual position; absence of S 2 and S 4; j 3, s 4, s 6, Z 4 and Z 5 distinctly longer than other dorsal setae; fixed cheliceral digit multidentate; legs III and IV with macrosetae; Galendromimus ( Galendromimus )– Z 1 and JV 3 present; Z 4 and Z 5 elongate and serrate; fixed cheliceral digit multidentate and peritreme extending to the level of r 3.