Epimorphosis of Heterosymelic Appendages in Tegenaria Atrica (Araneae, Agelenidae)

Epimorphosis of Heterosymelic Appendages inTegenaria Atrica(Araneae, Agelenidae) Studies of epimorphic regeneration of appendages were carried out on larvae and nymphs ofTegenaria atricaC.L. Koch with heterosymely (accretion of appendages on the same side of the body) of two walking appendages and of walking appendages with pedipalpi. All the anomalies were obtained by exposing developing embryos to alternate temperatures of 14 and 32°C. Amputation of fragments of anomalous appendages was always followed by regeneration. Based on the characteristic external structures of the regenerating joints, successive stages of epimorphosis were estabilished, whose start and end were marked by ecdyses. Several types of regenerates were found, whose anatomical structure did not undergo further significant changes until the end of our observations.