Cryophilic Isotomidae (Collembola) of the Northwestern Rocky Mountains, U. S. A. Author Fjellberg, Arne text Zootaxa 2010 2513 27 49 journal article 10.5281/zenodo.196078 3afa748f-2467-40ae-83ec-00984bfe7362 1175-5326 196078 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).