Tetracanthella fusca, Potapov & Deharveng, 2005

Potapov, Mikhail & Deharveng, Louis, 2005, Three new species of Tetracanthella (Collembola, Isotomidae) from western Europe, Zoosystema 27 (1), pp. 85-93 : 91

Tetracanthella fusca n. sp.

( Fig. 3 )

TYPE MATERIAL. — France. Ariège , Auzat, Vallée de Mounicou (1.445°E, 42.615°N), moss and lichens on soil at 2100 m, 11.X.1976, L. Deharveng leg. (sample # 09-156), holotype ( MNHN) ; 2 paratypes ( MSPU). — Ibid., humid mosses on soil at 2180 m, L. Deharveng leg. (sample # 09-158), 1 paratype ( MNHN). — Ibid., saxifrages on rocks at 2200 m, 12.VIII.1978, L. Deharveng leg. (sample # 09-192), 2 paratypes ( MNHN) .

OTHER MATERIAL EXAMINED. — France. Ariège, Bethmale, Pic de Montgarié (1.06148°E, 42.8369°N), meadow near a névé at 2000-2100 m, 17.VIII.1978, L. Deharveng leg. (sample # 09-199), 1 specimen. — Bethmale, Cirque de Campuls (1.063°E, 42.848°N), moss and litter in beech-fir forest at 1650 m, 1. V.1976, L. Deharveng leg. (sample # 09-045), 4 specimens. — Couflens, Cirque d’Anglade (1.199°E, 42.729°N), moss and humus near a névé at 1580 m, 20. VI.1976, L. Deharveng leg. (sample # 09- 049), 5 specimens.

ETYMOLOGY. — The name refers to the dark color of the species.

DISTRIBUTION. — Restricted to mountains of Ariège in French Pyrenees.

DESCRIPTION

Body length 0.9-1 mm. Body stout. Coloration greyish black including antennae.

Dorsal plates as roundish polygons, irregular, from medium to large, as long as 1-2 diameter of mesochaeta socket, locally smaller (specially laterally and around chaetae bases) ( Fig. 3D ). Canals between polygons deep. Smooth fields absent. Dorsal mesochaetae of medium size, longer in posterior row of Abd. IV (Md/p1 = 1.3-1.6). Mesochaetae not shortened in axial part of tergites: Abd. IV with p3 almost equal to p1 (p3/p1 = 1.0-1.2). Macrochaetae rather long, strong, straight, blunt or slightly clavate ( Fig. 3B ).

8+8 ocelli, G and H reduced (dcA/dcH = 1.5),

Figures

FIG. 3. — A-E, Tetracanthella fusca n. sp.; A, ocelli (pars) and PAO; B, dorsal chaetotaxy of Abd. II-VI; C, furcal area; D, dorsal plates in axial area near p1-chaetae of Abd. IV; E, chaetotaxy of Tita III; F, T. similis Deharveng, 1987, dorsal chaetotaxy of Abd. III-IV. In B and F, axial chaetae and s-chaetae are marked. Abbreviations: Abd. II-VI, abdominal tergites II-VI; PAO, postantennal organ; Tita III,