Plutomurus, Yosii, 1956

Chang, Gyudong & Park, Kyung-Hwa, 2020, Report on a new species of Plutomurus (Collembola, Tomoceridae) from a South Korean limestone cave, with notes on its DNA barcode, Zootaxa 4718 (1), pp. 108-122 : 119-120

Key to world species of genus Plutomurus

The following key was prepared based on the diagnostic character data of worldwide Plutomurus species by Jordana et al. (2012) and on the keys to the Japanese species by Yosii (1967), to the species of Russia and Georgia by Kniss & Thibaud (1999) and Barjadze et al. (2016), and to the species with 3 + 3 prelabral chaetae by Barjadze et al. (2018).

1. Prelabral chaetae 2 + 2................................................................................. 2

- Prelabral chaetae 3 + 3 or 4 + 4......................................................................... 19

2. Head with less than 6 + 6 eyes........................................................................... 3

- Head with 6 + 6 eyes.................................................................................. 9

3. Unguis with 4 or 5 inner teeth........................................... P. riugadoensis Yosii, 1939 ( Japan, cave)

- Unguis with 1 to 3 inner teeth........................................................................... 4

4. Head with 5 + 5 or 4 + 4 eyes...................................... P. sorosi Kniss & Thibaud, 1999 ( Georgia, cave)

- Head with less than 4 + 4 eyes........................................................................... 5

5. Mucro with 1 or without intermittent tooth................................................................. 6

- Mucro with 2 to 4 intermittent teeth....................................................................... 7

6. Unguis with 3 inner teeth. Mucro with 1 intermittent tooth. Dental spines formula as 10/3, I, 2, I, 2, I ....................................................................................... P. suzukaensis Yosii, 1939 ( Japan, cave)

- Unguis with 1 inner tooth. Mucro without intermittent tooth. Dental spines formula as 8–14/4–6, I, 2–3, I, 2–3, I ............................................................................... P. yamatensis Yosii, 1956 ( Japan, cave)

7. One big dental spine on basal dens. Species of Nearctic region.......... P. californicus ( Folsom, 1914) ( USA, cave & soil)

- No big dental spines on basal dens. Species of Palearctic region................................................ 8

8. Head with 2 + 2 eyes. Dental spines formula as 10–12/2–4, I, 3–4, I, 2, I, 2–3, I ................................................................................................... P. divesispinus Yosii 1966 ( South Korea, cave)

- Head with 3 + 3 eyes. Dental spines formula as 8–10/8–10, I ..................... P. leei Yosii,1966 ( South Korea, cave)

9. Unguiculus with inner teeth............................................................................ 10

- Unguiculus without inner tooth......................................................................... 15

10. Tibiotarsus of hindleg with only one spine-like chaeta....................................................... 11

- Tibiotarsus of hindleg with more than one spine-like chaetae.................................................. 12

11. Tibiotarsus of middle leg with one spine-like chaeta.............................. P. borealis Suma, 1981 ( Japan, soil)

- Tibiotarsus of middle leg without spine-like chaeta............... P. jeleznovodski Kniss & Thibaud, 1999 ( Georgia, cave)

12. Unguiculus with 3–4 inner teeth..................................... P. baschkiricus ( Skorikov, 1900) ( Russia, cave)

- Unguiculus with one or without inner tooth................................................................ 13

13. Tibiotarsus of middle leg with one spine-like chaeta........................ P. belozerovi Martynova, 1977 ( Russia, soil)

- Tibiotarsus of middle leg without spine-like chaeta.......................................................... 14

14. Tenent hair clavate. Mucro with 2–4 intermittent teeth. Dental spines formula as 3–8, II–III /0–3, I, 1–3, I, 2–4, I ...................................................................... P. wilkeyi ( Christiansen, 1964) ( USA, cave & soil)

- Tenent hair pointed. Mucro without intermittent tooth. Dental spines formula as 7–8, II /5, I, 3, I ...................................................................................... P. abchasicus Martynova, 1969 ( Georgia, soil)

15. Mucro with one basal tooth............................................................................ 16

- Mucro with more than one basal tooth.................................................................... 17

16. One to 2 big dental spines on basal dens. Dental spines formula as 4–7, I–II /3–4, I, 3–6, I. Unguis with 1–2 teeth......................................................................... P. brevimucronatus ( Denis, 1929) ( USA, cave)

- No big dental spine on basal dens. Dental spines formula as 5–8/5, I, 2, I. Unguis with 3 teeth............................................................................................... P. edaphicus Yosii, 1967 ( Japan, soil)

17. Dens with less than 10 spines basally..................................................................... 18

- Dens with more than 10 spines basally....................... P. birsteini Djanashvili & Barjadze, 2011 ( Georgia, cave)

18. Unguis with 2 inner teeth. Trochanteral-femoral organ as 15–18/7–9. Mucro with 0–1 intermittent tooth. Dental spines formula as 4, I /0–2, I, 1–2, I, 1–4, I ...................................... P. carpaticus Rusek & Weiner, 1978 (Europe, soil)

- Unguis with 5 inner teeth. Trochanteral-femoral organ as 30/40. Mucro with 2–4 intermittent teeth. Dental spines formula as 6, I /5, I, 1, I, 1, I, 2, I .............................................. P. vigintiferispina Lee, 1974 ( South Korea, cave)

19. Head without eye, or poorly visible eyes under optical microscope............................................. 20

- Head with eyes under optical microscope................................................................. 29

20. Mucro with one basal tooth............................................................................ 21

- Mucro with two basal teeth............................................................................ 22

21. Dens with 2+2 outer macrochaetae. 4+4 prelabral chaetae..................... P. marmorarius Yosii, 1967 ( Japan, cave)

- Dens with 3 + 3 outer macrochaetae. 3 + 3 prelabral chaetae...................... P. ehimensis Yosii, 1956 ( Japan, cave)

22. Unguis with 1–2 inner teeth............................................................................ 23

- Unguis with 3–5 inner teeth............................................................................ 28

23. Mucro with intermittent teeth........................................................................... 24

- Mucro without intermittent tooth........................................................................ 25

24. Small spines arranged in-a-row along with normal spines of dens............. P. jangamensis sp. nov. ( South Korea, cave)

- No small spines arranged in-a-row along with normal spines of dens....... P. gul Yosii, 1966 ( South Korea and Japan, cave)

25. Unguiculus with 0–3 inner teeth......................................................................... 26

- Unguiculus with 5–6 inner teeth......................................................................... 27

26. Tibiotarsus of hindleg with two spine-like chaetae. Basal dens without big spine..... P. kawasawai Yosii, 1956 ( Japan, cave)

- Tibiotarsus of hindleg with one spine-like chaeta. Basal dens with 1–2 big spines................................................................................................... P. eristoi Barjadze et al., 2016 ( Georgia, cave)

27. One big dental spine on basal dens. Dental spines formula as 7–9, I / I, 2–3, I, 2–3, I, 2, I .................................................................................... P. ortobalaganensis Jordana et al., 2012 (Abkhazia, cave)

- No big dental spine on basal dens. Dental spines formula as 9, 3/ I, 1, I, 1, I, 2, I ..... P. iwatensis Yoshii, 1991 ( Japan, cave)

28. Tibiotarsus of hindleg with one spine-like chaeta. Claw with 3–4/2–3 teeth..... P. grahami ( Christiansen, 1980) ( USA, cave)

- Tibiotarsus of hindleg with 2 spine-like chaetae. Claw with 4/5 teeth......... P. revazi Barjadze et al., 2016 ( Georgia, cave)

29. Tibiotarsus of hindleg with one spine-like chaeta....................... P. kelasuricus Martynova, 1969 ( Georgia, cave)

- Tibiotarsus of hindleg with 2 spine-like chaetae............................................................ 30

30. Abd IV with one macrochaeta and 5 mesochaetae in hind line...... P. shurubumuensis Barjadze et al., 2018 ( Georgia, cave)

- Abd IV with 3 macorchaetae and 3 mesochaetae in hind line............ P. pichkhaiai Barjadze et al., 2018 ( Georgia, cave)