title: Vanishing of an isolated population of thick-clawed crayfish Astacus pachypus (Crustacea: Decapoda: Astacidae) in the Sevastopol Bay (Crimean Peninsula, Black Sea)
abstract: In the XIX and XX centuries thickclawed crayfish Astacus pachypus was reported for the Sevastopol area in Crimea. Nowadays significant changes of hydrolological conditions and substrates took place in the only possible locality where a population of this species could exist -inner part of the Sevastopol Bay and the mouth of River Chernaya. Biotopes characteristic for this place in the XIX century were lost. Since the conditions optimal for thick-clawed crayfish in the River Chernaya estuary are 
journal: rej