reproductive biology

On communal egg-laying of the tiger keelback (Rhabdophis tigrinus) (Reptilia, Colubridae) in the Far East of Russia

Authors: Kidov A. A., Ivolga R. A., Ivanov A. A.

The paper presents the case of discovery of 60 eggs of the tiger keelback (Rhabdophis tigrinus) in the vicinity of the Dunay settlement (Primorsky Krai, Russian Federation) under a wooden railway sleeper on July 27, 2022. The authors suggest that it was a collective clutch of eggs from three females. Incubation in artificial conditions, from the discovery of this collective clutch to the release of juveniles from the eggs, lasted 17–20 days. Given the synchronicity of the hatching of young snakes, it is assumed that the eggs were laid by different females almost simultaneously.

On Eggs Re-Laying of Greenbelly Lizards from the Darevskia (Chlorogaster) Complex (Reptilia, Lacertidae)

Authors: Kidov A. A., Ivanov A. A., Kondratova T. E., Stolyarova E. A., Nemyko E. A.

The paper discusses cases of eggs re-laying in two lizard species from the Darevskia (chlorogaster) complex. A male and a female of D. Chlorogaster were captured on 22 March, 2016 in the Gilan province (Iran), and she subsequently laid eggs on 29 May (4 eggs) and 5 July (4 ones). The eggs had length of 10.4–12.8 mm, the width of 6.1–6.5 mm, and the weight of 0.240–0.340 g. Young lizards came out from seven eggs after 52–55 days of incubation. The body length of these newborn lizards was 22.9–27.8 mm, the tail length was 38.5–46.5 mm, and the weight was 0.330–0.460 g.