Petrobia

Martínez, Leocadia Sánchez, Flechtmann, Carlos H. W. & De Moraes, Gilberto J., 2014, Plant mites of the Dominican Republic, with a description of a new species of Petrobia (Tetranychina) Wainstein, 1960 (Acari, Prostigmata, Tetranychidae) and a key to the species of this subgenus, Zootaxa 3846 (4), pp. 547-560 : 558-559

KEY TO THE SPECIES OF PETROBIA ( TETRANYCHINA ) OF THE WORLD

Tetranychina was first proposed at the genus level by Banks (1917) and maintained at the same level by McGregor (1950). Wainstein (1960) considered this group to constitute a subgenus with Petrobia Murray , in which he was followed by Tuttle & Baker (1968). It was again restored to the genus level by Baker & Tuttle (1994), to be once again considered a subgenus of Petrobia by Bolland et al. (1998).

The following key is based on literature information about females, with countries/regions where originally described.

1. Dorsal opisthosomal setae very short, not reaching bases of consecutive setae, except for f1 and f2 which are longer........ 2

- Dorsal opisthosomal setae longer than longitudinal distances between bases of consecutive setae....................... 6

2. All dorso-opisthosomal setae set on tubercles............................. P. (T.) prasadi Baker & Tuttle, 1994 ( USA)

- Only dorsal opisthosomal setae f1 and f 2 set on tubercles....................................................... 3

3. Peritreme ending in anastomosing chambers forming a globular structure......................................... 4

- Peritreme ending in a single chamber, straight or slightly hooked................................................ 5

4. Seta f1 surpassing base of f2......................................... P . (T.) californica Baker & Tuttle, 1994 ( USA)

- Seta f1 not reaching base of f2................................................. P . (T.) apicalis Banks, 1917 ( USA)

5. All legs shorter than idiosoma (not including gnathosoma); distal section of peritreme slightly curved.......................................................................................... P. (T.) marsai Manson, 1964 ( Tunisia)

- Legs I and IV longer than idiosoma (not including gnathosoma); distal section of peritreme sigmoid..................................................................................... P. (T.) donnalucatensis Vacante, 1983 (Sicily)

6. Legs I shorter than idiosoma (not including gnathosoma)...................................................... 7

- Legs I as long as or longer than idiosoma (not including gnathosoma)............................................ 8

7. Dorsal body setae acutely tapering from base, set on moderate tubercles; females large, up to 950 µm long........................................................................ P. (T.) zachvatkini Reck & Bagdasarian, 1949 ( Armenia)

- Dorsal body setae filiform (more or less cylindrical) and set on very strong tubercles. Females ca. 580 µm long........................................................................ P. (T.) moutiai Baker & Pritchard, 1960 ( Mauritius)

8. Tubercles of dorsocentral setae c1, d1 and e1 contiguous....................................................... 9

- Tubercles of dorsocentral setae separated................................................................... 0

9. Peritreme ending in a simple, hooked chamber..................... P. (T.) uncata ( Flechtmann & Moraes, 1991) ( Brazil)

- Peritreme ending in anastomosing chambers forming a globular structure........ P. (T.) lippiae Baker & Tuttle, 1994 ( USA)

10. Legs I at most 1.5 times as long as idiosoma (not including gnathosoma)............. P. (T.) lupini McGregor, 1950 ( USA)

- Legs I at least twice as long as idiosoma (not including gnathosoma)............................................ 11

11. Legs I about twice as long as idiosoma (not including gnathosoma)............................................. 12

- Legs I well over twice as long as idiosoma (not including gnathosoma).......................................... 14

12. Stylophore with numerous anterior papillae................................. P. (T.) tribulus Chaudhri, 1972 ( Pakistan)

- Stylophore smooth.................................................................................... 13

13. Peritreme ending in a simple chamber............................................ P. (T.) harti Ewing, 1909 ( USA)

- Peritreme ending in anastomosing chambers forming a globular structure..... P. (T.) hispaniola n. sp. ( Dominican Republic)

14. Stylophore with an anteromedian notch and papillate; tibia I with 27 setae; tarsus I with 30 setae............................................................................................ P. (T.) nocitus Chaudhri, 1972 ( Pakistan)

- Stylophore without anteromedian notch, papillate or not; tibia I with 23–26 setae; tarsus I with 25–28 setae............. 15

15. Peritreme enlarged and hooked distally; stylophore without papillae....... P. (T.) kleptes Kamran & Afzal, 2004 ( Pakistan)

- Peritreme ending in anastomosing chambers, forming a heart shaped bulb; stylophore papillate....................... 16

16. Dorsal idiosomal striation simple; leg IV ca 1200 µm long................... P. (T.) afzali Sabri & Afzal, 2007 ( Pakistan)

- Dorsal idiosomal striation dotted; leg IV ca. 938 µm long........................ P. (T.) cardi Chaudhri, 1972 ( Pakistan)