Symmetry in ejaculate volumes of Centrobolus inscriptus Attems (Spiroboloidea: Trigoniulidae)
TL;DR
This study tests the lock-and-key hypothesis by examining whether paired, complex copulatory organs affect ejaculate volume flexibility in Centrobolus inscriptus, finding no significant differences in ejaculate volumes deposited in left versus right female storage organs across various mating types.
Abstract
Translate Article 
I test an assumption of the lock-and-key hypothesis that paired and complex copulatory organs may impede flexibility. I found no differences in ejaculate volumes (dpm) deposited by males in left versus right female storage organs of Centrobolus inscriptus involved in single, double and artificially-terminated matings.