Licneremaeus, Paoli, 1908

Arun, A. & Ramani, N., 2020, Two remarkable new species of oribatid mites (Acari: Oribatida) from Acacia litter of Kerala, India, Zootaxa 4877 (3), pp. 539-558 : 556

Key to the adults of known species of Licneremaeus of the world

Bomfim et al. (2017) provided a key to the genus Licneremaeus but this key shows a minor mistake. They includ-ed L. novus along with the group of mites having 13 pairs of notogastral setae, but they have 12 pairs of notogastral setae only. Therefore, we corrected this mistake and updated the key with the present newly described species.

1. Notogaster with 12 or 13 pairs of setae, c 2 absent............................................................ 2

- Notogaster 14 pairs of setae, c 2 present [ Brazil]......................... L. braziliensis Bomfim, Silva & Oliveira, 2017

2. Notogaster with 12 pairs of setae......................................................................... 3

- Notogaster with 13 pairs of setae......................................................................... 5

3. Single areola between the field delimited by the bases of setae c 1; single areola between the field delimited by c 1 and da .... 4

- Two areolae between the field delimited by the bases of seate c 1; two areolae between the field delimited by c 1 and da [Caucasia, Portugal, Spain]..................................................... L. novus Karppinen & Shtanchaeva, 1987

4. Three closely placed areolae between the field delimited by the bases of dm and da; no reticulations on prodorsum; ad 1 postanal [ Austria, Spain]............................................................ L. prodigiosus Schuster, 1958

- Single areola between the field delimited by the bases of dm and da; prodorsum with reticulations; ad 1 para-anal [ Fiji, Vietnam, Madagascar].................................................................. L. polygonalis Hammer, 1971

5. Areolae present on notogaster........................................................................... 6

- Areolae absent on notogaster [ Chile]........................................... L. altiplanicus Covarrubias, 2005

6. Notogaster with more than 32 areolae..................................................................... 7

- Notogaster with less than 32 areolae..................................................................... 10

7. Transverse bump present on prodorsum.................................................................... 8

- Transverse bump absent on prodorsum [ Brazil, Cuba].......................... L. cubanus Balogh & Mahunka, 1980

8. Sensillus clavate; no areolae between/anterior to the bases of setae da [ Venezuela]........... L. exornatus Grandjean, 1931

- Sensillus flattened; areolae present between or anterior to the bases of setae da .................................... 9

9. Transverse ridge connecting the bases of ro present; two contiguous areolae between the setae c 1 [ Italy]................................................................................................... L. giustii Bernini, 1973

- Transverse ridge connecting the bases of ro absent; single areolae between setae c 1 [ Tunisia].. L. embeyisztini Mahunka, 1980

10. Number of areolae on notogaster ≥ 20.................................................................... 11

- Number of areolae on notogaster ≤ 17.................................................................... 12

11. Discoidal sensillus [ Brazil, Guatemala]............................................ L. discoidalis Willmann, 1930

- Fusiform sensillus [ Brazil, Japan, Komodo, New Guinea, Peru]......................... L. novaeguineae Balogh, 1968

12. Median areola present between the field delimited by the bases of c 1 and da ...................................... 13

- Median areola sabsent between the field delimited by the bases of c 1 and da ...................................... 16

13. Areolae present on ventral plate; curved hump present at the level of dp ......................................... 14

- Areolae absent on ventral plate; curved hump at the level of dp present or absent.................................. 15

14. 14 pairs of areolae on notgaster; areolae present between the field delimited by the bases of da and dm; sensillus clavate [ India].................................................................................. L. indicus sp.nov.

- 10 pairs of areolae on notogaster; areolae between the field delimited by the bases of da and dm absent; sensillus flattened [ England, USA, Vietnam]....................................................... L. licnophorus ( Michael, 1882)

15. Curved hump present at the level of dp; areolae between the field delimited by the bases of da and dm present [Java]..................................................................................... L. linieatus Hammer, 1979

- Curved hump absent at the level of dp; areolae between the field delimited by the bases of da and dm absent [ Mauritius]............................................................................. L. semiareolatus Mahunka, 1978

16. Median crista present between c 1 and da; bases of setae le connected by a transverse bump [ Tanzania]................................................................................................. L. cristatus Mahunka, 1984

- No median crista between c 1 and da; bases of setae le not connected by transverse bump [ Ethiopia]................................................................................................. L. costulatus Mahunka, 1982