Petrobia
Creators: name: Martínez, Leocadia Sánchez
name: Flechtmann, Carlos H. W.
name: De Moraes, Gilberto J.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Prostigmata
Tetranychidae
Petrobia

description: 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)
description: Published as part of 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, pp. 547-560 in Zootaxa 3846 (4) on pages 558-559, DOI: 10.11646/zootaxa.3846.4.3, http://zenodo.org/record/226073