FIGURE 2. Bothrioneurum species. A–E. B in On spermatophore-producing aquatic microdrile oligochaetes (Annelida: Clitellata)

FIGURE 2. Bothrioneurum species. A–E. B. vejdovskyanum Štolc, 1886 (from Tarmo Timm's collection). A. Spermatophore attached to the clitellar region. B. Atrium with a diffuse layer of prostatic cells. C,D. Copulatory organ (= paratrium). E. Developing sperm morulae in the coelom (composed from 2 photos). F–J. B. brauni Marcus, 1949 (Marchese's collection). F. Spermatophore capsule. G. Detail of sperm funnel and atrium. H. Junction of atrium and ental section of the copulatory bursa. I,J. Copulatory organ (= paratrium) with conical projection of glands to the copulatory bursa. B, D, G–J histological sections. Abbreviations: a atrium, cb copulatory bursa, gl gland, m muscular layer, pa paratrium, pr prostatic cells, sf sperm funnel, t testis, vd vas deferens.