Folsomia

Potapov, Mikhail & Gulgenova, Ayuna, 2013, Isotomidae (Collembola) of Buryat Republic. II. A revision of the genus Folsomia, Zootaxa 3682 (2), pp. 305-330 : 307-308

Key to Buryatian Folsomia species

1 Median sensilla of Abd.I–III in posterior row of chaetae ( Fig. 2 ). Without ocelli................................... 2

- Median sensilla of Abd.I–III in mid-tergal position ( Fig. 12 ). Ocelli present or absent............................... 6

2 Ventrum of Th.III with chaetae........................................................... F. candida complex

- Ventrum of Th.III without chaetae........................................................................ 3

3 Median sensilla of Th.II–III in posterior row of chaetae. Posterior side of dens with 3 chaetae in basal part.............. 4

- Median sensilla of Th.II–III in front of posterior row of chaetae ( Fig. 2 ). Posterior side of dens with 4 chaetae in basal part ( Fig. 8 )............................................................................................. 5

4 Manubrium with 2+2 chaetae on anterior side....................................................... F. bisetosa

- Manubrium with more than 2+2 chaetae on anterior side ............................................... F. fimetaria

5 Strong median macrochaetae present on Th.III ( Fig. 5 ). Three sensilla of Abd.IV set together ( Fig. 4 )...................................................................................................... F. heterothorax sp. nov.

- Median macrochaetae on Th.III absent or, if present, much shorter than lateral. Lateral sensilla of Abd.IV set in lateroventral position, apart from two dorsal sensilla (as in Fig. 16 )............................................. F. sparsosetosa

6 Maxillary palp bifurcate ( Fig. 10 )........................................................................ 7

- Maxillary palp simple ( Fig. 28 )........................................................................ 21

7 Manubrium with 1+1 chaetae on anterior side............................................................... 8

- Manubrium with more than 1+1 chaetae on anterior side...................................................... 15

8 Ventral tube with 4+4 laterodistal chaetae. Central part of posterior side of manubrium with more than 2+2 chaetae (as in Figs 26 and 27 ).......................................................................................... 9

- Ventral tube with 3+3 laterodistal chaetae. Central part of posterior side of manubrium with 2+2 chaetae............... 11

9 Microsensilla present on Th.III, general formula of ms 1,1/1,1–0,0.................................... F. amplissima

- Microsensilla absent on Th.III, general formula of ms 1,0/1,0,0............................................... 10

10 Without ocelli and pigment....................................................................... F. vto rov i

- With a pair of ocelli and pigment.............................................................. F. continentalis

11 With two ocelli on each side of the head. Basal ms present on Ant.III............................................ 12

- With one ocellus on each side of the head or ocelli absent. Basal ms absent on Ant.III.............................. 13

12 Hind corner sensilla in p-row of chaetae on Th.II (as in Fig. 12 )............................... F. manolachei complex

- Hind corner sensilla in front of p-row of chaetae on Th.II......................................... F. quadrioculata

13 Ocelli absent........................................................................... F. fumo sa sp. nov.

- With one ocellus on each side of the head................................................................. 14

14 Microsensilla present on Th.III, general formula of ms 1,1/1,0,0. Dens with 8 anterior chaetae.................. F. rossica

- Microsensilla absent on Th.III, general formula of ms 1,0/1,0,0. Dens with 7 anterior chaetae............. F. palaearctica

15 Macrochaetae short. Ant.I with 3 sensilla........................................................ gr. sexoculata

- Macrochaetae long. Ant.I with 2 sensilla ( Fig. 10 ).......................................................... 16

16 With foil chaetae at the end of abdomen ( Fig. 16 ). Dens with more than 20 anterior chaetae........................ 17

- Without foil chaetae at the end of abdomen ( Fig. 22 ). Dens with no more than 12 anterior chaetae.................... 18

17 Ventrum of Th.III with chaetae..................................................................... F. culter

- Ventrum of Th.III without chaetae........................................................ F. maximovi sp. nov.

18 No more than 8 anterior chaetae on dens. With distinct pigmentation on body........................... F. atropolaris

- More than 8 anterior chaetae on dens. Without distinct pigmentation on body..................................... 19

19 General formula of ms 1,1/1,1,1 ( Fig. 20 )................................................ F. sensivillosa sp. nov.

- General formula of ms 1,0/1,0,0 (as in Fig. 12 )............................................................ 20

20 Ventral tube with 4+4 laterodistal chaetae........................................................... F. villosa

- Ventral tube with 3+3 laterodistal chaetae......................................................... F. baicalica

21 Ventrum of Th.III with a pair of chaetae.......................................................... F. paoinflata

- Ventrum of Th.III without chaetae...................................................................... 22

22 5 ocelli on each side of the head. 2+2 anterior chaetae on manubrium.......................... F. pseudodecemoculata

- Without ocelli. Number of anterior chaetae on manubrium varies.............................................. 23

23 Dens with 16–18 anterior chaetae ( Fig. 34 )................................................. F. uniramia sp. nov.

- Dens with up to 9 anterior chaetae ( Fig. 41 )............................................................... 24

24 Foil chaetae absent at the end of abdomen ( Fig. 29 ). Median sensilla in anterior half of tergite of Th.II (as in Fig. 12 )....................................................................................... F. pseudovtorovi sp. nov.

- Foil chaetae present at the end of abdomen ( Fig. 40 ). Median sensilla in posterior half of tergite of Th.II ( Fig. 39 )........ 25

25 Manubrium with 1+1 chaetae on anterior side, dens with 2 posterior chaetae ( Fig. 33 )................ F. uniparis sp. nov.

- Manubrium with 2+2 chaetae on anterior side, dens with 4 posterior chaetae ( Fig. 24 ).............................. 26

26 Two lateral thickened sensilla on each side of Abd.V ( Fig. 40 ).................................... F. vitimica sp. nov.

- One lateral thickened sensillum on each side of Abd.V ( Fig. 24 ).................................. F. biparis sp. nov.

Figures

FIGURES 2 – 6. F. heterothorax sp. nov.: 2, Habitus and chaetotaxy; 3 – 4, chaetotaxy of posterior part of Abd. IV, V and VI, dorsal (3) and lateral (4) views; 5, Th. II and III; 6, PAO and Ant. I.

FIGURES 11 – 15. F. f u m o s a sp. nov.: 11, habitus of adult male; 12, chaetotaxy; 13, hind corner of Th. II; 14, sensilla of Abd. IV and V; 15, records.

FIGURES 7 – 10. F. heterothorax sp. nov. (7, 8) and F. f u m o s a sp. nov. (9, 10): 7, 9, Furca, anterior view; 8, dens; 10, anterior part of the head.

FIGURES 16 – 19. F. maximovi sp. nov. (16, 17) and F. sensivillosa sp. nov. (18, 19): 16, sensilla and macrochaetae of Abd. IV – VI; 17, 18, furca, lateral view (on manubrium chaetae of only one side shown); 19, furca, anterior view.

FIGURES 24 – 30. F. biparis sp. nov. (24) and F. pseudovtorovi sp. nov. (25 – 30): 24, posterior part of abdomen; 25, dens; 26, manubrium, posterior view; 27, VT; 28, anterior part of the head; 29, Abd. IV – VI; 30, sensilla of Abd. V.

FIGURES 20 – 23. F. sensivillosa sp. nov.: 20, habitus and chaetotaxy; 21, lateral part of Abd. III; 22, chaetotaxy of Abd. IV – VI; 23, records, two closely related species also shown.

FIGURES 33 – 38. F. uniparis sp. nov. (33) and F. uniramia sp. nov. (34 – 38): 33, Furca of adult male; 34, posterior part of abdomen; 35, Abd. IV – VI, dorsal view; 36, variation of lateral sensilla on Abd. V; 37, anterior part of the head; 38, posterior side of manubrium.

FIGURES 39 – 43. F. vitimica sp. nov.: 39, Habitus and chaetotaxy; 40, posterior part of abdomen; 41, furca; 42, anterior part of the head; 43, posterior side of manubrium.