Desoria garibaldii Fjellberg, 2010, sp. n.

Desoria garibaldii sp. n.

(Figs. 44–49, 115F)

Type material (all in alcohol, sex not checked). Holotype and 60 paratypes from " Canada, B.C., Garibaldi Park, Helm Glacier, 49o57'N, 123o0'W, 02.IX.1983. Muddy blue ice at terminal lobe, 1,770 m alt. A. Fjellberg 398/83" (INHS). Other material: USA, Alaska, Ptarmigan Glacier, summer 2003, P. Hartzell leg; Washington, Snohomish Co., Honeycomb Suiattle Glacier, 12.VIII.2002, snow pack on glacier ice, P. Hartzell leg.; same county, Columbia Glacier, 04.VIII.2002, snow pack on glacier ice, P. Hartzell leg; same state, Whatcom Co., Easton Glacier, 48o44''N, 121o50'W, 04.VIII.2002, on snow, P. Hartzell leg.

Description. Body size up to 1.6 mm. Body shape slender, typical Desoria (Fig. 115F). Head shape normal. Abd. 5–6 almost completely fused, with a weak incision between the tergites and a distinct break in setal cover. Colour completely black, including extremities. Head without white spots between eye-fields. Freshly collected specimens with a greenish lustre. Unlike most species even small juveniles as dark as the adults. Ocelli 8+8, rather small. PAO oval, about 1.5 as long as diameter of nearest ocellus. Three setae associated with PAO (Fig. 48). Ant. 1 with 5–8 short curved ventroapical sensilla and a few curved setaceous sensilla (Fig. 45). Ant. 2 with a single ventrolateral curved sensillum in apical position. Ant. 3 organ, with a few additional sensilla (Fig. 46). Ant. 4 with bifurcate pin seta and a small apically expanded peg in the subapical organ. Labrum with 4/554 normal setae, apical edge with 4 sharp ridges and a composite ventral ciliation. Frontoclypeal field with 10–15 setae, two setae between antennal base and upper corner of labrum. Maxillary palp bifurcate, 4 sublobal setae. Labial palp complete, guard e 7 present; terminal seta on the papillae as long as guards. Hypostomal papilla with subequal H and h1/h2. Labial base with 5(4) median and 5 lateral setae. Head with 4+4(3) postlabial setae. Mandibles normal, strong. Maxillae unmodified, with 3-toothed capitulum and short lamellae densely covered with fine denticles. Integument smooth. Ground cover of setae uniform and dense, not markedly "double" (cf. Fig. 30) except on dorsal side of head and thorax. Macrochaetae smooth, short, poorly differentiated from ordinary setae. Median macrochaeta on abd. 5 only 1.0–1.2 as long as inner length of last claw. Sensillary formula in a juvenile specimen as 55/44456, spine-like microsensilla 10/001 (Fig. 44). On abd. 1–4 sensilla set slightly anterior to p-row; anterior sensilla present on abd. 4–5. Ventral tube on each side with 1+1 frontal and 5–6 lateral setae, posterior side with 4–6 setae. Retinaculum with 4+4 teeth and 9–15 setae. No ventral setae on thorax. Manubrium with blunt apical teeth and 2–3 short ventroapical setae on each side, ventromedial field with many (>40) setae. Dens dorsally crenulated, with 20–30 dorsal setae extending beyond mid point; ventroapical seta not prolonged. Mucro short and compact, with 4 sharp primary teeth. Inner lateral lamella not reaching tip of subapical tooth and so forming a small secondary tooth; lateral seta absent (Fig. 49). Tibiotarsi with 11 apical setae, all acuminate. Inner side of tib.1–2 with 3–4 setae along each side of median line. Claws with small lateral teeth, a weak inner tooth may be present on anterior two pairs of claws; unguiculus with a high dorsal lamella (Fig. 47). Males present, reproductive individuals not seen.

Etymology. The new species is named after the type locality, Garibaldi Provincial Park in British Columbia. The park itself was named in honour of Guiseppe Garibaldi (1807–1882), the Italian revolutionary who paved the way for a unified Italy.

Discussion. The species is recognised by the dark colour, short body setae, compact mucro and many dorsal setae on dens. It is close to D. cancellarei Christiansen et Bellinger, 1980, described from snow in Iowa, but this latter species is pale blue and has only 6+6 ocelli and longer abdominal setae (longest abdominal macrochaetae at least twice as long as inner edge of last claw). Also garibaldii has a 4-toothed mucro, while the mucro has 5 teeth in cancellarei.

Distribution and ecology. Common and abundant on and near snow and glacier ice in the northwestern Rocky Mountains in Alaska, British Columbia and Washington (details see above).