Scutisotoma, Bagnall, 1949

Potapov, Mikhail, Babenko, Anatoly & Fjellberg, Arne, 2006, Taxonomy of the Proisotoma complex. Redefinition of genera and description of new species of Scutisotoma and Weberacantha (Collembola, Isotomidae), Zootaxa 1382 (1), pp. 1-74 : 55-57

publication ID	https://doi.org/ 10.11646/zootaxa.1382.1.1
publication LSID	lsid:zoobank.org:pub:DA24BC85-1740-4465-8342-AD1D10878CD2
persistent identifier	https://treatment.plazi.org/id/039587D4-FFB5-FFC7-1373-FEDB7553FDBF
treatment provided by	Felipe
scientific name	Scutisotoma
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Treatment

Key to known species of Scutisotoma View in CoL

A number of other known species of the Proisotoma complex, especially Nearctic ones, may actually belong to the genus Scutisotoma . They are not included in the key because of insufficient descriptions.

1 Maxillary outer lobe with a simple palp........................................................................ 2

- Maxillary palp bifurcate................................................................................................ 6

2 No ventral chaetae on Th.III ......................................................................................... 3

- With ventral chaetae on Th.III....................................................................................... 5

3 Prelabral chaetae 4. Labial papilla E with 7 guards (as on Fig. 15 View FIGURES 12–17 )................................ .................................................................................................... S. christianseni (Stach)

- Prelabral chaetae 3. Labial papilla E with 6 guards, e 7 absent (as on Fig. 17 View FIGURES 12–17 ).............. 4

4 VT with 3+3 laterodistal chaetae. Dens with 6–7 anterior and 8 posterior chaetae........ ........................................................................................................ S. subarctica (Gisin)

- VT with 4+4 laterodistal chaetae. Dens with 1 anterior and 3–4 posterior chaetae ( Fig. 140 View FIGURES 139–142 ) ..................................................................................................... S. indigirka sp.n.

5 Mucro with 2 teeth ........................................................................ S. fjellbergi (Dunger)

- Mucro with 3 teeth .......................................................................... S. oirota (Vilkamaa)

6 Manubrium without anterior chaetae ( Figs. 122–123 View FIGURES 119–126 , 128 View FIGURES 127–132 ).......................................... 7

- Manubrium with 1+1 (rarely 2+2) anterior chaetae .................................................... 12

7 Ocelli 5+5...................................................................................................................... 8

- Ocelli 8+8...................................................................................................................... 9

8 Dens with 1 anterior and 1–3 posterior chaetae. Mucro bidentate, sometimes shortened or totally absent ............................................................................... S. variabilis (Gisin)

- Dens without anterior chaeta ( Fig. 128 View FIGURES 127–132 ). Mucro usually hook-like ................................ ...................................................................................................... S. stachanoremi sp.n.

9 One of the lateral sensilla on Th.II–III set behind the macrochaeta ( Figs. 126 View FIGURES 119–126 , 131 View FIGURES 127–132 ). 10

- Lateral sensilla on Th.II form a single group in front of the macrochaeta (as on Fig. 80 View FIGURES 80–86 ) ..................................................................................................................................... 11

10 Dens with 1 anterior chaeta. Mucro with 2 teeth ( Figs. 122–123 View FIGURES 119–126 ). Tenaculum with 4+4 teeth ( Fig. 120 View FIGURES 119–126 ) ..................................................................................... S. montana sp.n.

- Dens without anterior chaeta. Mucro absent. Tenaculum with 2+2 teeth ....................... ...................................................................................................... S. tolerans (Babenko)

11 Manubrium with 8–10+8–10 posterior chaetae on the main part. Ti.1–3 with 21-21-25 chaetae ...................................................................................... S. stepposa (Martynova)

- Manubrium with 17–18+17–18 posterior chaetae on the main part ( Fig. 133 View FIGURES 133–138 ). Ti.1–3 with more than 21-21-25 chaetae ( Figs. 136, 137 View FIGURES 133–138 ) ................................... S. baica sp.n.

12 Number of sensilla on Th.II–Abd.V as 33/22224 ( Figs. 6 View FIGURES 6–11 , 46 View FIGURES 45–47 )................................... 14

- Number of sensilla on thorax and abdomen more than above .................................... 13

13 Number of sensilla on Th.II–Abd.V as 44/33334 ( Fig.8 View FIGURES 6–11 for Abd.III)............................. .................................................................................................... S. armeriae (Fjellberg) - Number of sensilla on thorax and abdomen more than above ( Figs. 31, 32 View FIGURES 31–35 ).................. ............................................................................................................. S. titusi (Folsom)

14 Dens with 1 anterior and 2–3 posterior chaetae ( Figs. 114, 115 View FIGURES 114–118 ).. S.dodecocellata sp.n.

- Dens with more chaetae .............................................................................................. 15

15 Two laterodistal sensilla on Ant.3 ( Fig. 70 View FIGURES 67–71 ) ................................................................ 16

- One laterodistal sensillum on Ant.3 ( Fig. 101 View FIGURES 99–102 ) ........................................................... 19

16 Mucro with 3 teeth ...................................................................................................... 17

- Mucro with 2 teeth ...................................................................................................... 18

17 Tergal sensilla chaeta-like, almost as long as ordinary chaetae. One of the medial sensilla (accp2) on Abd.V moved anteriorly ( Fig. 79 View FIGURES 72–79 ). Basal half of dens without anterior chaetae ( Fig. 74 View FIGURES 72–79 ) ............................................................................. S. longisensilla sp.n.

- Tergal sensilla short and slightly thickened. Lateral sensilla on Abd.V set in a transverse line ( Fig. 71 View FIGURES 67–71 ). Less than basal 1/3 of dens without anterior chaetae ( Figs. 67, 69 View FIGURES 67–71 ) .............................................................................................................. S. kolymica sp.n.

18 Tenaculum with 3+3 teeth .................................. S. ananevae (Babenko & Bulavintsev)

- Tenaculum with 4+4 teeth ............................................................... S. millimetrica sp.n.

19 Furca long, dens with more than 25 anterior and 20 posterior chaetae ( Figs. 36, 37 View FIGURES 36–39 ) 25

- Furca shorter, dens with fewer than 13 anterior and 13 posterior chaetae.................. 20

20 Mucro with 2 teeth ( Fig. 111 View FIGURES 109–113 ), or a third minute proximal tooth may be present ( Figs. 105–107 View FIGURES 103–108 ). Dens with 6–8 anterior chaetae.................................................................. 21

- Mucro with 3 teeth, proximal tooth almost as strong as apical and subapical ones ( Fig. 89 View FIGURES 87–92 ). Dens with 10–13 anterior chaetae........................................................................ 24

21 Dens with 10–11 posterior chaetae ( Figs. 110, 111 View FIGURES 109–113 ) ......................... S. acorrelata sp.n.

- Dens with at most 8 posterior chaetae ( Fig. 103 View FIGURES 103–108 )........................................................ 22

22 Mucro usually with 3 teeth, the proximal one hardly visible ( Figs. 106, 107 View FIGURES 103–108 ). On Abd.V accp3 and accp4 sensilla longer than medial pair of sensilla ( Fig. 108 View FIGURES 103–108 ). Labial papilla E with full number of guards (e 1 –e 7) ( Fig. 15 View FIGURES 12–17 ) ................. S. tenuidentifera sp.n.

- Mucro with 2 teeth. On Abd.V accp3 and accp4 sensilla clearly shorter than medial pair ( Fig. 146, 148 View FIGURES 143–150 ). Labial papilla E with 6 guards (e 7 absent) ( Fig. 17 View FIGURES 12–17 )................... 23

23 Dens with 6–7 posterior chaetae ( Fig. 149 View FIGURES 143–150 ) ........................ S. tianshanica (Martynova)

- Dens with 4 posterior chaetae ( Fig.144 View FIGURES 143–150 ) ............................................. S. nicksmeti sp.n.

24 Dens with 8–9 posterior chaetae (4-5 basal, 2 inner, 1 outer and 1 subapical) ( Fig. 99 View FIGURES 99–102 ) ............................................................................................................... S. matalini sp.n.

- Dens with 10–13 posterior chaetae (5–6 basal, 3 inner, 2 (1–3) outer and 1 subapical) ( Fig. 88 View FIGURES 87–92 ) .................................................................................................... S. schisti sp.n.

25 VT with 2 posterior chaetae. The most lateral sensillum on Th.II set posterior to other sensilla of the lateral group ( Figs. 59–61 View FIGURES 58–64 ). Abd.V with 2 anterior and 2 posterior sensilla ( Fig. 58 View FIGURES 58–64 ). Modified chaetae on Ti. 3 in males are long and strong ( Fig. 55 View FIGURES 48–57 )............ .............................................................................................................. S. karadagi sp.n.

- VT with more than 4 posterior chaetae ( Fig. 47 View FIGURES 45–47 ). All lateral sensilla on Th.II form a single group in anterior part of the tergite ( Fig.46 View FIGURES 45–47 ). Position of sensilla on Abd.V not as above. Modified chaetae on Ti. 3 in males are short and chaeta-like ( Fig. 43 View FIGURES 40–44 ) ....... 26

26 Labium with 4 basomedian chaetae. Dens crenulated ( Fig. 37 View FIGURES 36–39 ). On Abd.V one sensillum (accp2) set posterior to others ( Fig. 39 View FIGURES 36–39 ). Males with many spine-like macrochaetae on tergites ........................................................................... S. muriphila (Grinbergs)

- Labium usually with 5 basomedian chaetae. Dens tuberculated ( Fig. 41 View FIGURES 40–44 ). On Abd.V all sensilla set in a line ( Fig. 45 View FIGURES 45–47 ). Males without spine-like macrochaetae.......................... .............................................................................................................. S. ladaki (Denis)