Desoria cryophila, Fjellberg, Arne, 2010

Fjellberg, Arne, 2010, Cryophilic Isotomidae (Collembola) of the Northwestern Rocky Mountains, U. S. A., Zootaxa 2513, pp. 27-49 : 38

publication ID	https://doi.org/ 10.5281/zenodo.196078
DOI	https://doi.org/10.5281/zenodo.3500064
persistent identifier	https://treatment.plazi.org/id/504F2D6C-FFD2-FF82-97BE-F08EFDC91BDE
treatment provided by	Plazi
scientific name	Desoria cryophila
status	sp. nov.

Treatment

Desoria cryophila sp. n.

( Figs. 57–63 View FIGURES 57 – 77 , 115H View FIGURE 115. A – H )

Type material. Holotype (alc.) and 33 paratypes (26 in alcohol, 7 in two slides) from " Canada, Alberta, Kananaskis, French creek, 50o55'N, 134o40'W, 16.VI.1984. Wet moss at waterfall, 1,930 m. alt., A. Fjellberg leg." ( INHS).

Description. Size up to 1.2 mm. Body shape normal for the genus, with a slightly pear-shaped abdomen. Head normal, not prognathous/hypognathous. Abd. 5–6 fused without distinct break in setal cover. Colour white with black eye-spots ( Fig. 115H View FIGURE 115. A – H ). Ocelli 6+6 (G & H absent), PAO oval, slightly shorter than diameter of nearest ocellus. Three setae associated with PAO ( Fig. 58 View FIGURES 57 – 77 ). Ant. 1 ventrally with 4–5 short thick apical sensilla and several slender setaceous sensilla; base with a group of ventral microsensilla ( Fig. 60 View FIGURES 57 – 77 ). Ant. 2 with 3–4 small and thin sensilla in lateroapical position ( Fig. 62 View FIGURES 57 – 77 ). Ant. 3 organ with some additional setaceous sensilla ( Fig. 61 View FIGURES 57 – 77 ). No ventral erect sensilla present on ant. 2–3. Ant. 4 with bifurcate pin seta and a small globular organite in the subapical organ. Labrum with 4/554 normal setae, apical edge with 4 sharp folds and a composite ventral ciliation. Frontoclypeal area with 5–9 setae, two setae between antennal base and labral corner. Maxillary palp bifurcate, four sublobal setae. Labial palps unmodified, complete, guard e7 present; terminal sensilla on the papillae as long as guards; four proximal setae present. Hypostomal group with H as long as h1/h2. Basal fields of labium with 4(5) median and 5 lateral setae. Head with 5–6 postlabial setae. Mandibles normal, strong. Maxillae unmodified, with short denticulate lamellae and 3-toothed capitulum. Body integument smooth. Body with a dense markedly "double" setal cover with short ordinary setae and dagger-like mesochaetae some as long as the erect macrochaetae on thorax and abd. 1 (as Fig. 30 View FIGURES 30 – 56 ). Macrochaetae moderately strong on abdomen, distinctly serrated on the last abdominal segments. Median macrochaetae on abd. 5 about 2.5 as long as inner edge of last claw. Sensilla on the tergites hard to see in adults because of dense setal cover, but several half-grown juveniles show distribution as 55/44456 ( Fig. 57 View FIGURES 57 – 77 ) with some variation in number on the three last segments; anterior sensilla present on abd. 4–5; spine-like microsensilla distributed as 11/001. Ventral tube on each side with (1)3–5 frontal and up to 15 lateral setae, posterior side with up to 8 setae. Retinaculum with 4+4 teeth and up to 8 setae. Manubrium with blunt apical teeth and 3+3(4) short ventroapical setae; ventromedial field densely pilose, with more than 50 setae. Dens dorsally crenulated, with 12–14 dorsal setae in proximal half and a tiny subapical setula; subapical ventral seta not prolonged. Mucro with 4 sharp primary teeth and a small secondary tooth on the inner side formed by the inner lateral lamella ending before tip of the subapical tooth ( Fig. 59 View FIGURES 57 – 77 ); apical and subapical teeth subequal; no lateral seta. Tibiotarsi with 11 apical setae, all acuminate. Legs long and slender, inner side of Tib. 1–2 with 4– 5 setae along each side of median line ( Fig. 63 View FIGURES 57 – 77 ). Claws of normal shape, with small laterobasal teeth and a weak tooth in the middle of the inner edge; unguiculus with high basal lamella, usually with a small corner tooth. Males present, reproductive individuals not seen.

Etymology. The name reflects the cold environment in which the species lives.

Discussion. Recognised by the white colour, bifurcate maxillary palp, more than 5 lateral setae on the ventral tube, more than 10 dorsal setae on dens, rarely more than 4 basomedian setae on labium, and subcoxa 1 having only one seta. Otherwise it is similar to rosea which has a slightly larger PAO, more compact mucro and a more open cover of setae on Abd. 5–6 which is less rounded and more clearly separated. The erect sensilla which are observed ventrally on ant. 2–3 in rosea , are not seen in cryophila .

Distribution and ecology. Only known from the type locality which is a cold water stream in the Kananaskis mountains, Alberta.