Tengella Dahl, 1901

Tengella Dahl, 1901; type species = Tengella perfuga Dahl, 1901 .

Metafecenia F. O. Pickard-Cambridge, 1902; type species = Metafecenia albolineata F. O. Pickard-Cambridge, synonymy by Lehtinen, 1967. Type species: Tengella perfuga Dahl, 1901, by original designation.

Diagnosis. Tengella differ from other New World Tengellidae, as well as the Old World genus Austrotengella Raven, 2012, in having (1) a bipartite cribellum and calamistrum (Figs. 2A, C), (2) four pairs of ventral spines on tibiae I and II, and (3) three prolateral and four retrolateral teeth on the chelicerae (Wolff 1977; Platnick 2009). Two additional Old World tengellids are cribellate, but easily distinguished from Tengella for the same characters as above. Wiltona Koçak & Kemal, 2008, differs due to the presence of a small, whole cribellum, as well as heavily reduced use of cribellate silk due to active foraging as adults (Forster & Wilton 1973, Forster & Forster 1999). Calamistrula Dahl, 1901, differs by the loss of the cribellum and calamistrum in adulthood (Lehtinen 1967).