biology not known
Female: Epigynal shield narrows posteriorly (can be pointed or bilobed at tip) (Figs. 2, 5). Anal shield with anterior-lateral horn-like projections (Figs. 2, 5). Anterior part of sternal shield is completely (e.g., Bisternalis rettenmeyeri) or partially (e.g., Bisternalis mexicanus) separated from the remaining sternal shield (Figs. 3, 4), hence the name of this genus. However, in one species, Bisternalis camargoi, the anterior part of sternal shield is not separated.
The most recent dichotomous key to species is available in Baker et al., 1984.
Similar to the genera Holostaspis (oophagous in ant nests) and Myrmozercon (intimate associates of ants) by their large epigynal shield that narrows posteriorly (in many species) and anal shield concave anteriorly (in many species).
Bisternalis differs from Holostaspis and Myrmozercon by the anterior part of its sternal shield that is completely (e.g., Bisternalis rettenmeyeri) or partially (e.g., Bisternalis mexicanus) separated from the remaining sternal shield (Figs. 3, 4). However, in one species, Bisternalis camargoi, the sternal shield is typical (undivided), but its epigynal shield is pointed posteriorly (never pointed in Holostaspis).
Bisternalis differs from Myrmozercon by the presence of well-developed claws (reduced or absent in Myrmozercon) and the presence of denticles (small, tooth-like processes) on cheliceral digits (not developed in Myrmozercon).
stingless bees (Lestrimelitta, Trigona, Melipona, and Partamona)
associated exclusively with bees or their close relative, wasps; cannot live without these hosts
some life stages are associated with bees, while others are not
can complete entire life cycle without bees or their close relative, wasps