Pentamerismus McGregor 1949
Creators: name: Mirza, Jawwad Hassan
name: Elgoni, Nasreldeen Ahmed
name: Kamran, Muhammad
name: Alatawi, Fahad Jaber
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Tenuipalpidae
Pentamerismus

description: Key to subgenera and species of Pentamerismus of the world
1. Dorsal opisthosomal setae f 2 absent. Subgenus Pentamerismus (Oligomerismus) Mitrofanov, 1973 ................... 2
- Dorsal opisthosomal setae f 2 present. Subgenus Pentamerismus (Pentamerismus) McGregor, 1949 .................. 11
2. Dorsal opisthosoma with dorsolateral setae c 2 and d 2 setiform.................................................. 3
- Dorsal opisthosoma with dorsolateral setae c 2 and d 2 lanceolate to spatulate....................................... 5
3. Dorsal propodosoma with small medial notch forming a pair of lobes anterior to setae v 2 ......... P. (O.) taxi (Haller, 1877)
- Dorsal propodosoma with anterior margin without pair of lobes................................................ 4
4. Dorsal idiosoma entirely striate, dorsolateral (c 3, d 3, e 2, e 3, f 3, h 2 and h 1) setae long................................................................................................. P. (O.) tauricus Livshitz & Mitrofanov, 1970
- Dorsal idiosoma reticulate, dorsolateral setae (c 3, d 3, e 2, e 3, f 3, h 2 and h 1) short.................................................................................................. P. (O.) coronatus (Canestrini & Fanzago, 1876)
5. Dorsal opisthosomal setae c 1, d 1, e 1 minute, setiform......................................................... 6
- Dorsal opisthosomal setae c 1, d 1, e 1 lanceolate to spatulate.................................................... 10
6. Either or both dorsal propodosoma and opisthosoma with reticulations.......................................... 7
- Dorsal opisthosoma with lineate cuticle................................................................... 8
7. Dorsal idiosoma cuticle completely reticulate............................ P. (O.) ossianensis Thewke & Enns, 1971
- Dorsal propodosoma and dorsal opisthosoma each with only a small medial region of reticulation.............................................................................................. P. (O.) judiciarius De Leon, 1961
8. Genu I and II with two setae......................................... P. (O.) shandongensis (Wang & Ma, 1993)
- Genu I and II with three setae........................................................................... 9
9. Palp tibia with one seta................................................... P. (O.) canadensis McGregor, 1949
- Palp tibia with two setae.................................................. P. (O.) oregonensis McGregor, 1949
10. Dorsal propodosoma medially reticulated.......................................... P. (O.) foetidae (Meyer, 1979)
- Dorsal propodosoma medially striated or rugose...................................... P. (O.) retusus Meyer, 1979
11. Dorsal opisthosomal setae setiform...................................................................... 14
- Dorsal opisthosomal setae broadly lanceolate to spatulate.................................................... 12
12. Genital and pseudanal setae broadly lanceolate and heavily barbed............... P. (P.) sititoris Beard & Seeman, 2014
- Gential and pseudanal setae fine, setiform and weakly barbed................................................. 13
13. Palp tibia with two setae, dorsal cuticle weakly reticulated........................ P. (P.) wardo Seeman & Beard, 2014
- Palp tibia with one seta, dorsal cuticle strongly reticulated................ P. (P.) hicklingorum Seeman & Beard, 2014
14. Femora I–II with three setae............................................ P. (P.) kunmingensis Ma & Yaun, 1980
- Femora I–II with four setae............................................................................ 15
15. Anterior margin of dorsal propodosoma shallowly notched................................................... 16
- Anterior margin of dorsal propodosoma deeply notched..................................................... 17
16. Palp femur with one seta; dorsal propodosomal setae slender.................... P. (P.) arbutusae Baker & Tuttle, 1987
- Palp femur without seta; propodosomal setae spatulate or leaf like............... P. (P.) abnormis Baker & Tuttle, 1987
17. Dorsal propodosomal setae setiform................................. P. (P.) ueckermanni Khanjani & Gotoh, 2008
- Propodosomal setae spatulate or leaf like................................................................. 18
18. Dorsal propodosoma medially smooth................................ P. (P.) behsharicus Khanjani & Gotoh, 2008
- Dorsal propodosoma medially rugose lineate, reticulate striated............................................... 19
19. Dorsal propodosoma completely reticulate-rugose.......................................................... 20
- Dorsal propodosoma irregular lineate.................................................................... 21
20. Dorsal opisthosomal setae c 2 setiform............................................ P. (P.) erythreus (Ewing, 1917)
- Dorsal opisthosomal setae c 2 lanceolate................................ P. (P.) bahaensis Alatawi & Kamran, 2015
21. Dorsal opisthosomal seta c 2 setiform................................................. P. (P.) juniperi Reck, 1951
- Dorsal opisthosomal seta c 2 lanceolate................................ P. (P.) foliisetis Livshitz & Mitrofanov, 1967
description: Published as part of Mirza, Jawwad Hassan, Elgoni, Nasreldeen Ahmed, Kamran, Muhammad & Alatawi, Fahad Jaber, 2025, Subgenera of the genus Pentamerismus McGregor (Acari: Tenuipalpidae) with the re-description of Pentamerismus retusus Meyer and a key to species of the world, pp. 143-156 in Zootaxa 5601 (1) on pages 153-154, DOI: 10.11646/zootaxa.5601.1.7, http://zenodo.org/record/14980641