Collembola
Creators: name: Fjellberg, Arne
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Entognatha
Collembola

description: 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) ................................................................................................................................................ 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) 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); mucro apparently 3-toothed (Fig. 17) .................................... 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) ............................................................................................................................................................ 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); mucro with lateral seta present (Fig. 92); maxillae with 4 lamellae extending beyond tip of capitulum (Figs. 88–89) ....................................... 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). 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), with short and long setae; head with two large triangular pale spots between eyes (Figs. 110, 115 E) ................................................................................ Desoria triangularis sp. n.
- Ground cover of body setae simple, of uniform length; head with 4 small pale spots between eyes (Fig. 111)............ ................................................................................................................................................ Desoria albicornis sp. n.
description: Published as part of Fjellberg, Arne, 2010, Cryophilic Isotomidae (Collembola) of the Northwestern Rocky Mountains, U. S. A., pp. 27-49 in Zootaxa 2513 on pages 46-47, DOI: 10.5281/zenodo.196078