Graminaseius bahiensis, Carvalho, Adeilma Nascimento De, Oliveira, Aníbal Ramadan, Argolo, Poliane Sá & Ferragut, Francisco, 2017

Carvalho, Adeilma Nascimento De, Oliveira, Aníbal Ramadan, Argolo, Poliane Sá & Ferragut, Francisco, 2017, Three new species of phytoseiid mites (Acari: Phytoseiidae) from Bahia State, Brazil, Zootaxa 4272 (1), pp. 142-150 : 145-147

Graminaseius bahiensis n. sp. Ferragut & Carvalho

Diagnosis. Female dorsal shield smooth with faint anterolateral striae. Dorsal setal pattern 10A:9B. Seventeen pairs of dorsal setae, Z4 and Z5 lightly serrated, the remainder smooth. Seven pairs of dorsal solenostomes. Peritremes extend to j1. Seta r3 much longer than R1, which is minute. Sternal shield almost quadrate, with three pairs of setae. Ventrianal shield pentagonal, straight anteriorly, somewhat concave laterally; cuticle finely striated. Three pairs of pre-anal setae, pre-anal pores crescentic and mesad to JV2. Fixed digit of chelicerae with eight teeth and two subapical denticles, movable digit with three teeth. Genu II with seven setae. Macrosetae on all legs blunt or knobbed. Calyx short and saccular; atrium well-developed, tulip-like, incised laterally. Bifurcate juncture between atrium and major duct.

FEMALE ( Figs 8–12 ) (five females measured)

Dorsal surface. Dorsal shield 344 (338, 322–353) long, 198 (206, 198–210) wide, mainly smooth with faintly anterolateral striae. Seventeen pairs of smooth and acute setae, Z4 and Z5 lightly serrated. Seta j1 25 (24, 21–26), j3 30 (29, 27–32), j4 6 (6,–6–7), j5 5 (4, 4–5), j6 5 (5, 5–6), J2 6 (6, 6–7), J5 8 (7, 7–8), z2 16 (16, 15–17), z4 32 (30, 28–32), z5 4 (4, 4–5), Z1 6 (6), Z4 57 (57, 55–60), Z5 76 (78, 76–80), s4 48 (47, 44–48), S2 16 (16, 15–16), S4 7 (6, 6–7), S5 7 (6, 6–7), r3 20 (20, 20–21), R1 7 (7, 6–8). Seven pairs of solenostomes. Pore gd1 lateral to j3, gd5 posteromediad to z5, gd9 anteromediad to S5. Peritremes reaching setae j1.

Ventral surface. Sternal shield smooth and almost quadrate, with three pairs of setae and straight posterior margin. Distance st1–st3 63 (63, 62-64), distance st2–st2 68 (66, 65–68). Seta st4 on metasternal platelets. Genital shield 63 (62, 58–64) wide. Ventrianal shield pentagonal, straight anteriorly, somewhat concave laterally, longer than wide, 116 (121, 114–133) long, 87 (86, 83–93) wide at level of ZV2. Cuticle evenly and finely striated. Three pairs of pre-anal setae; pre-anal (gv3) pores crescentic, distance between them 23 (24, 22–26). Four pairs of setae surrounding the shield, JV5 smooth, pointed and placed on small platelets, 52 (51, 46–55) long.

Chelicerae. Fixed digit 29 (26, 24–29), movable digit 29 (29 2 5 –33). Fixed digit with ten teeth, two subapical denticles and eight aligned teeth; movable digit with three teeth.

Insemination apparatus. Major duct long, on one specimen it appears fusiform and membranous. Atrium well-developed, tulip-like, incised laterally. In the juncture between atrium and major duct there is a triangular bifurcation. Calyx short, saccular 6 (6, 6–7) long.

Legs. Genu II with seven setae; 1 2/0 2/0 2. Macrosetae on all legs blunt or knobbed. Macrosetae on genu I 26 (26, 24–26), genu II 23 (23, 22–24), genu III 26 (25, 24–26), genu IV 42 (40, 38–42), tibia IV 22 (21, 19–22), basitarsus IV 65 (62, 59–65).

MALE: Unknown.

Type Material: Holotype female and four paratype females from Laportea aestuans (L.) Chew ( Urticaceae ). Ilhéus (CEPLAC), Bahia, Brazil 14°45'35" S, 39°13'49" W, 7 April 2015, 32 m a.s.l . Holotype and paratypes deposited in the collection of Acari at Laboratory of Entomology, Universidade Estadual de Santa Cruz, Ilhéus - BA, Brazil .

Etymology: The specific name bahiensis refers to the State in Brazil where the mites were collected.

Remarks : Graminaseius bahiensis belongs to the graminis species group defined by Chant & McMurtry (2004), characterised by having seta S2 longer than Z1. It is similar to G. mastus ( Denmark & Muma ) and G. saltus (Zack) from Florida and Missouri, respectively, in that all of them have relatively short dorsal setae, seven pairs of dorsal solenostomes and a saccular calyx with a well-developed atrium. The new species is larger and differs from G. mastus and G. saltus by the relative length of setae S2, S4 and S5 which are much longer in the latter (S2 42; S4 14; S5 14 in G. mastus and S2 31; S4 16; S5 15 in G. saltus , respectivelly). In G. bahiensis the calyx is short and almost similar in length to the atrium, whereas in G. mastus and G. saltus the calyx is much longer than atrium. In G. saltus the fixed digit of chelicera bears six or seven teeth instead of ten in G. bahiensis .

Figures

FIGURES 8 – 12. Graminaseius bahiensis n. sp. 8. Female dorsal shield, 9. Female ventral surface, 10. Female chelicera, 11. Spermatheca (two examples), 12. Female leg IV.