Agrenia bidenticulata

(Tullberg, 1876)

Agrenia bidenticulata is the of the Agrenia, a in the . It belongs to the bidenticulata species group, characterized by the presence of a mucronal . show considerable morphological variation across their range, with Buryatian mountain forms differing from typical populations in length. The species exhibits sexual (epitoky) and cyclomorphosis.

Pronunciation

How to pronounce Agrenia bidenticulata: /əˈɡriːniə ˌbaɪˌdɛntɪˈkjuːˌleɪtə/

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Identification

Distinguished from other Agrenia by the presence of a mucronal (placing it in the bidenticulata-group versus the agilis-group). Separation from closely related forms within the A. bidenticulata lato complex requires examination of index and Tibiotarsus/Claw ratio, which vary with latitude. The of the provides additional diagnostic characters for species-level separation.

Appearance

Small, elongated with diagnostic mucronal on the . lacks sublobal hairs on the outer lobe. Dens bears and a long subapical macrochaeta on the inner side. possesses a tunica. varies geographically: typical have relatively shorter claws, while South Siberian mountain populations exhibit much longer claws.

Habitat

, sub-arctic, and montane environments. Occurs in High Arctic regions and mountainous areas of South Siberia. Strictly northern hemisphere distribution in and montane zones.

Distribution

Holarctic. Palearctic: High , sub-Arctic, Europe, Mediterranean region, northeastern Eurasia including Buryatia (Russia, East Siberia) and South Siberian mountains. Nearctic: northern North America.

Life Cycle

Cyclomorphosis reported.

Similar Taxa

Agrenia agilis-group speciesLack mucronal ; A. bidenticulata possesses this diagnostic structure
Other forms in A. bidenticulata sensu lato complexDiffer in index and Tibiotarsus/Claw ratio; Buryatian have much longer claws than typical A. bidenticulata

More Details

A. bidenticulata sensu lato complex

Buryatian of a form similar to A. bidenticulata differ sufficiently from the typical that a broader A. bidenticulata lato complex has been proposed. This complex comprises several local forms varying in index and associated Tibiotarsus/Claw ratio, with these indexes showing dependence on latitude.