Geckobia, Megnin, 1878

Machado, Ingrid B., Gazêta, Gilberto S., Pérez, José, Cunha, Rodolfo & Giupponi, Alessandro P. De L., 2019, Two new species of the genus Geckobia Mégnin, 1878 (Acariformes, Prostigmata, Pterygosomatidae) from Peru, Zootaxa 4657 (2), pp. 333-351 : 347-348

Key to species of Geckobia from the Americas

1. Propodonotal shield with a prominent concave recess at base; with weakly defined ellipsoid opisthosomal plate that encompasses the genitoanal region; palp phaneres ul’, ul”, acm and sul present, setiform and five times greater than the length of the article ( Figs. 3–5 ).......................................................................... G. adina n. sp.

- Propodonotal shield, genitoanal region and palp phaneres not as described above................................... 2

2. Opisthosoma with longitudinal folds positioned laterally and contouring the entire idiosoma; a trifurcate spine at the base of the palp claw; with 6 pairs of genital setae and 7 pairs of aggenital setae; 13 setae on tarsi II–IV ( Figs. 27–30 ).. G. circumdata n. sp.

- Opisthosoma, base of the palp claw and number of pairs of genital and aggenital setae not as described above; 10 setae on tarsi II–IV............................................................................................... 3

3. Coxae of legs III–IV with a total of 4 or fewer serrated setae. Coxae I–II with 3 or fewer serrated setae. Femora I–IV formula: (2-1-1-1)...................................................................... G. keegani Lawrence, 1953 .

- Coxae of legs III–IV with a total of 5 serrated setae. Coxae I–II with 3 or 4 setae. Femora I–IV formula: (2-2-2-2) or (3-2-2- 2)................................................................................................. 4

4. Trochanters I–II with dorsal setae................................................ G. bataviensis Vitzthum, 1926 .

- Trochanter I with or without dorsal seta, trochanter II lacking dorsal seta......................................... 5

5. Propodonotal shield with 5 pairs of setae. Anogenital area with 8 pairs of setae..... G. aureae Quiroz-Gutiérrez et al., 2015 .

- Propodonotal shield with (<5) or (> 5) pairs of setae. Anogenital area with fewer than 8 pairs of setae................. 6

6. Anogenital area with 6 pairs of dorsal setae, including g1–g3........................... G. hemidactyli Lawrence, 1936

- Anogenital area with fewer or greater than 6 pairs of setae distributed dorsally or ventrally........................... 7

7. Trochanters I–IV formula (2-1-1-1), dorsal seta present on trochanter I. Femora I–IV formula: (2-2-2-2). Dorsal setae present only on trochanter I............................................................ G. tarentole De la Cruz, 1973 .

- Trochanters I–IV formula (1-1-1-1), dorsal seta absent on all trochanters. Femora I–IV formula: (3-2-2-2)............... 8

8. Palp genu with dG seta serrated.......................................... G. guyanensis Floch & Abonnenc, 1944 .

- Palp genu with dG seta smooth.......................................................................... 9

9. Palp femur with dF seta smooth......................................................................... 10

- Palp femur with dF seta serrated........................................................................ 11

10. Setal formula of genua I–IV (5–4–3–3[2]) and femora I–IV (5–4–3–3[2]). Five pairs of pseudanal setae. Chelicera (195– 210μm)........................................................................... G. nitidus Fajfer, 2015 .

- Setal formula of genua I–IV (5–4–3–3) and femora I–IV (5–4–3–2). Six pairs of pseudanal setae. Chelicera (135–140μm)............................................................................... G. zapallarensis Fajfer, 2015 .

11. Genua formula I–IV: (0-0-0-1).................................... G. leonilae Hoffmann & Morales-Malacara, 1986 .

- Genua formula I–IV: (1-0-0-0) or (1-0-0-1)................................................................ 12

12. Setal formula of genua I–IV (1-0-0-0). Coxae formula (2-2-4-3).......................... G. gerrhopygus Fajfer, 2015

- Setal formula of genua I–IV (1-0-0-1). Coxae formula (1-2-2-3) or (2-2-2-3)..................................... 13

13. Coxae I with one seta. Propodonotal shield represented by two small fragments and with a pair of robust and serrated setae between these fragments................................................. G. manaensis Floch & Abonnenc, 1945 .

- Coxae I with two setae. Propodonotal shield with discrete recess at base............ G. cayennensis Floch & Fauran, 1955 .

Figures

FIGURES 3–5. Geckobia andina n. sp., female. 3, Gnathosoma, dorsal view; 4, Palp, ventral view; 5, Gnathobasal seta, ventral view.

FIGURES 27–30. Geckobia circumdata n. sp., female. Legs, postero-lateral view: 27, Leg 1; 28, Leg 2; 29, Leg 3; 30, Leg 4.