Mucronia enigmatica Fjellberg, 2010, sp. n.

• Main Author: Fjellberg, Arne
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Fungi; Arthropoda; Collembola; Entomobryomorpha; Isotomidae; Mucronia; Mucronia enigmatica; glacier; Alaska
• Online Access: https://doi.org/10.5281/zenodo.3504045; http://treatment.plazi.org/id/504F2D6CFFC9FF9A97BEF759FB271BDF

Mucronia enigmatica sp. n. (Figs. 93–109) Type material . Holotype: Reproductive male (slide) from "Alaska: Juneau. Mts. between Mendenhall Glacier and Montana Creek Trail, 58o29'N, 134o40'W, 13.VII.1980. On melt-water ponds, 975 m. alt., A. Fjellberg leg." Paratype: Reproductive male (slide, without head) from the same sample. Both specimens are transparent due to long storage in diluted ethanol and details of chaetotaxy are hard to see (INHS). Description . Body size 0.95 mm (in slide). Body slender, with long furca (Fig. 93). Eye-spots dark, otherwise almost white. Frons slightly swollen. Abd. 5–6 not fused. Eye-fields with 6+6 large ocelli. PAO about the size of an ocellus, roundish, with four blunt lobes and swollen mid section (Fig. 94). Details of antennal chaetotaxy not seen, apart from ant. 3 organ which has two large sensilla and a ventrolateral spinelike sensillum (Fig. 99). Labrum with 5,5,4 papillate stiff setae, 4 prelabrals, anterior edge with four low ridges followed by a median tubercle (Fig. 97). Ventroapical ciliation not seen (if present presumably very fine). Frontoclypeal field with 10–12 setae. Maxillary outer lobe with trifurcate palp; sublobal setae unclear, but at least two present (Fig. 98). Labial palps modified, with papillae A–B, C–D and E in three separate groups (Figs. 95, 103). Terminal setae of the papillae short, not longer than surrounding guards. All guards present, including e7. Guards b4 and d4 enlarged, recurved at apex. Four proximal setae present. Hypostomal papilla reduced, H, h1 and h2 subequal. Basal fields of labium with 4 median and 5 lateral setae (Fig. 95). Postlabial setae 3–4 on each side. Mandibles normal, with strong molar plate and 4–5 apical teeth. Maxilla highly modified with 6 elongated lamellae and a narrow long stylet representing the capitulum, stylet with a small hook in apical 1/3 (Fig. 96); Lam.1 with weak denticles in apical 1/3; Lam.2 with rows of small sharp teeth along the edges only, extending from base to tip; Lam.3 present as a small flap at ...