Agrenia agilis Fjellberg, 1986

Fjellberg, Arne & Bernard, Ernest C., 2009, Review of Agrenia Börner, 1906 with descriptions of four new species from North America (Collembola, Isotomidae), Zootaxa 2306, pp. 17-28 : 20

Agrenia agilis Fjellberg, 1986

Figs. 1 M; 3A; 6B, E

So far this species is known only from the Pacific Northwest region bordering the Juan de Fuca and Georgia Straits (Olympic National Park, Washington, and Garibaldi Provincial Park, British Columbia, respectively). It was collected from moss along mountain streams and waterfalls. The species is recognised by its markedly prognathous head ( Fig. 3 A), abundant anterior setae on the ventral tube (more than 10 on each side), apical tooth of mucro much larger than subapical tooth ( Fig. 6 B), slender claws, and normal, thin, setae on the body.

Figures

FIGURE 1. A-G, mucro shapes of Agrenia spp. A. A. extrema n. sp., lateral view; B. A. extrema n. sp., dorsal view; C. A. parkeri n. sp., winter form; D. A. parkeri n. sp., summer form; E. A. falcula n. sp., ventral view showing the broad ventral lamella; F. A. falcula n. sp., lateral view; G. A. tarashchukae n. sp. H-K, claws of hind legs. H. A. falcula n. sp.; I. A. tarashchukae n. sp.; J. A. parkeri n. sp., winter form; K. A. extrema n. sp. L-N, maxillae. L. A. extrema n. sp., ventral side (left) and inner side (right); M. A. agilis, inner side; N. A. falcula n. sp., ventral side.

FIGURE 3. Habitus of Agrenia spp. A. A. agilis; B. A. atroviridis; C. A. cyanura, lateral; (D) A. cyanura, dorsal. Scale bars = 1 mm.

FIGURE 6. Agrenia spp. A-C, mucrones. A. A. tarashchukae n. sp.; B. A. agilis; C. A. falcula n. sp.; D-E. Tips of Ant. IV. D. A. extrema n. sp.; E. A. agilis. Scale bars = 20 μm.