Collembola

Fjellberg, Arne, 2010, Cryophilic Isotomidae (Collembola) of the Northwestern Rocky Mountains, U. S. A., Zootaxa 2513, pp. 27-49 : 46-47

publication ID	https://doi.org/ 10.5281/zenodo.196078
DOI	https://doi.org/10.5281/zenodo.5670743
persistent identifier	https://treatment.plazi.org/id/504F2D6C-FFCA-FF9D-97BE-F736FA5C19D4
treatment provided by	Plazi
scientific name	Collembola
status

Treatment

Key to cryophilic Collembola of the genera Myopia, Gnathisotoma and Desoria of the North West Rocky Mountains

1 Body white or with weak pigment only; mucro with 5 teeth ....................................................................................... 2

- Body distinctly pigmented, in several species bluish black with contrasting white antennae; mucro with 3–5 teeth 7

2 Maxillary palp bifurcate; labrum and maxilla unmodified .......................................................................................... 3

- Maxillary palp trifurcate; labrum with stiff spine-like setae set close together; maxilla with elongated lamellae ( Fig. 77 View FIGURES 57 – 77 ) ................................................................................................................................................ Desoria capra sp. n.

3 Ventral tube with 6 or fewer setae on each side of the lateral flaps; dens with 7–8 dorsal setae ................................ 4

- Ventral tube with more than 6 (up to 15) lateral setae on each side; dens with more than 10 dorsal setae.................... ................................................................................................................................................. Desoria cryophila sp. n.

4 Ground cover of setae on head and body distinctly "double" (as Fig. 30 View FIGURES 30 – 56 ) with short and long setae mixed .............. 5

- Ground cover of setae uniform, not clearly "double" .................................................................................................. 6

5 Abdominal macrochaetae long; M1 on abd. 5 at least 2.5 as long as inner edge of last claw........ Desoria rosea sp. n.

- Abdominal macrochaeta hardly developed; M1 on abd. 5 less than 2.0 as long as inner edge of last claw .................. .................................................................................................................................................................. Desoria sp. B

6 Sensilla on th. 2–abd. 5 distributed as 22/11135; basomedian field of labium with 4 setae ... Desoria olympica sp. n.

- Sensilla on th. 2–abd. 5 distributed as 44/32345; basomedian field of labium with 5 setae ................... Desoria sp. A

7 Tibiotarsi with 9 apical setae ( Fig. 14 View FIGURES 1 – 29 ); mucro apparently 3-toothed ( Fig. 17 View FIGURES 1 – 29 ) .................................... Desoria uniens

- Tibiotarsi with 11 apical setae; mucro with at least 4 distinct teeth ............................................................................ 8

8. Anterior two ocelli displaced anteriorly; PAO small and narrow, almost hidden, with one associated seta ( Figs. 2–3 View FIGURES 1 – 29 ) ............................................................................................................................................................ Myopia alaskana

- Anterior two ocelli not so strongly displaced; PAO roundish, distinct, with more than one associated seta.............. 9

9. Manubrium with at most 1–2 midventral setae ( Fig. 85 View FIGURES 78 – 92 ); mucro with lateral seta present ( Fig. 92 View FIGURES 78 – 92 ); maxillae with 4 lamellae extending beyond tip of capitulum ( Figs. 88–89 View FIGURES 78 – 92 ) ....................................... Gnathisotoma spinolabris sp. n.

- Manubrium with more than two midventral setae; lateral seta absent on mucro; maxillae with at most one lamella extending beyond tip of capitulum ............................................................................................................................ 10

10. Abdominal macrochaetae very long and densely ciliated, those on abd. 5 more than 3 times as long as inner edge of last claw ........................................................................................................................................... Desoria ater sp. n.

- Abdominal macrochaetae shorter, not densely ciliated, those on abd. 5 less than 3 times as long as inner edge of last claw ............................................................................................................................................................................. 11

11. Frontoclypeal field with more than 30 setae ( Fig. 53 View FIGURES 30 – 56 ). Mucro with 4 teeth ............................ Desoria pilifrons sp. n.

- Frontoclypeal field with fewer than 30 setae. Mucro with 4 or 5 teeth...................................................................... 12

12. Whole body black, including antennae; no white spots on head between antennae. Mucro with 4 teeth...................... ................................................................................................................................................ Desoria garibaldii sp. n.

- Antennae with at least some segments contrastingly white. Mucro with 5 teeth ....................................................... 13

13. Ground cover of body setae "double" (as Fig. 30 View FIGURES 30 – 56 ), with short and long setae; head with two large triangular pale spots between eyes ( Figs. 110 View FIGURES 110 – 114 , 115 E View FIGURE 115. A – H ) ................................................................................ Desoria triangularis sp. n.

- Ground cover of body setae simple, of uniform length; head with 4 small pale spots between eyes ( Fig. 111 View FIGURES 110 – 114 )............ ................................................................................................................................................ Desoria albicornis sp. n.