Gnathisotoma spinolabris Fjellberg, 2010, sp. n.

• Main Author: Fjellberg, Arne
• Format: Other/Unknown Material
• Language: unknown
• Published: 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Entognatha; Collembola; Isotomidae; Gnathisotoma; Gnathisotoma spinolabris; Seta; glacier; Alaska
• Online Access: https://zenodo.org/record/3509449; https://doi.org/10.5281/zenodo.3509449

Gnathisotoma spinolabris sp. n. (Figs. 78–92, 114, 115G) Type material (all in alcohol, sex not checked). Holotype and 50 paratypes from "Alaska: Juneau. Mts. near Mendenhall Glacier, 58 o 29 'N, 134 o 40 'W, 13.VII. 1980. On melt–water ponds, 975 m. alt., A. Fjellberg leg." (INHS). Description. Body size up to 1.2 mm. Body shape slender, abdomen slightly pear-shaped, widening towards tip of abdomen, furca long (Fig. 115 G). Head distinctly prognathous, with protruding mouth (Fig. 81). Abd. 5–6 fused without incision between the segments but with a clear gap in setal cover. Colour uniformly bluish black with white antennae, including the first segment. Tip of ant. 4 with a diffuse dark spot. Occipital area of head with a large crown-shaped white spot (Figs. 114, 115G). Legs pale beyond coxae, dens pale. Head with 6 + 6 large ocelli A–F, a small H ocellus also present. PAO elongated, slightly longer than diameter of nearest ocellus. Three setae associated with PAO (Fig. 83). Ant. 1 on ventral side with one short apical and three longer sensilla as well as 2–3 microsetae (Fig. 79). Ant. 2 with two lateral poorly differentiated setaceous sensilla near apex. Ant. 3 organ with two large pointed sensilla and two slender guards (Fig. 84). In lateral position on ant. 3 one small and one large sensillum near apex. Ant. 4 with bifurcate subapical pin seta, the subapical organite as a small peg in a pit. Labrum with 4 prelabral setae and 5,5, 4 stiff spine-like setae inserted in distinct papillae (Fig. 80); apical edge with 4 low ridges; ventroapical ciliation very weak, in the shape of a simple irregular row. Central field of frontoclypeal area with 4–5 setae, two setae above posterior corner of labrum. Maxillary palp simple, with 4 stiff sublobal setae set close together. Labial palps modified, each split in two parts consisting of papillae A–B and C–E respectively (Fig. 90). Terminal sensilla of the papillae short; guards b 3 –b 4 enlarged, strongly curved; guard e 7 absent; lateral process (l.p.) on papilla E small, ...