Desoria olympica, Fjellberg, Arne, 2010

Fjellberg, Arne, 2010, Cryophilic Isotomidae (Collembola) of the Northwestern Rocky Mountains, U. S. A., Zootaxa 2513, pp. 27-49 : 39-40

publication ID	https://doi.org/ 10.5281/zenodo.196078
DOI	https://doi.org/10.5281/zenodo.5670731
persistent identifier	https://treatment.plazi.org/id/504F2D6C-FFD5-FF84-97BE-F5CEFB431F21
treatment provided by	Plazi
scientific name	Desoria olympica
status	sp. nov.

Treatment

Desoria olympica sp. n.

( Figs. 71–76 View FIGURES 57 – 77 )

Type material (all in slides). Holotype (male) and 10 paratypes (in 4 slides) from " USA, Washington, Olympic National Park, Hurricane Ridge 47o59'N, 123o31'W, 10.IX.1983. Wet moss at snow edge, 1,800 m., A. Fjellberg 422/83" ( INHS).

Description. Size up to 1.0 mm. Colour white, eye-spots black. Body shape as in two previous species, abd. 5–6 weakly separated. Characters of ocelli, labrum, labial and maxillary palps, maxillae and mandibles as in previous two species. PAO roundish, the size of a ocellus ( Fig. 75 View FIGURES 57 – 77 ). Frontoclypeal field with three setae ( Fig. 76 View FIGURES 57 – 77 ). Ant. 1 with only two ventroapical short sensilla in addition to a few setaceous ones, ant. 2–3 with only the standard set of sensilla. Ventromedian field of labium with 4 setae. Head with 3+3(4) postlabial setae. Body integument smooth; setal cover sparse and uniform. Macrochaetae distinct, smooth. Median macrochaetae on abd. 5 about 2.7 times as long as inner edge of last claw. Number of ordinary sensilla on tergites as 22/11135 ( Fig. 71 View FIGURES 57 – 77 ). Microsensilla as 11/001. Posterior sensilla on th. 2–abd. 4 set in the p-row; no ordinary sensillum laterally to the spine-like ms on abd. 3. Ventral tube with only 1+1 frontal setae; retinaculum with only two setae (10 specimens examined); ventral central field of manubrium with fewer than 20 setae ( Fig. 74 View FIGURES 57 – 77 ); dens with 7 dorsal setae; mucro 5-toothed ( Fig. 73 View FIGURES 57 – 77 ). Inner side of tib. 1-2 with three pairs of setae along median line ( Fig. 72 View FIGURES 57 – 77 ). Males present, reproductive specimens not seen.

Etymology. Named after the type locality, the Olympic National Park.

Discussion. The character which immediately identifies olympica is the reduced number of tergal sensilla (22/11135), which is probably the lowest number observed in any Desoria . Unlike the two previous species the posterior sensilla on th. 2–abd. 4 are set in the p-row. It also differs by the reduced number of antennal sensilla and the low number of setae on ventral tube and retinaculum ( Table 1 View TABLE 1 ).

Distribution and ecology. This distinct species is only known from the type series which appeared in a wet snow edge community in the coastal mountains above Port Angeles, Washington.