Description of the embryonic development of Cherax quadricarinatus (Von Martens, 1868) (Decapoda, Parastacidae), based on the staging method

The complete embryonic development of Cherax quadricarinatus, the redclaw crayfish, is described based on external morphological changes. Substages prior to hatching are defined in relation to the percentage time of embryonic development. Ten prehatching and three posthatching stages are described and illustrated. Embryo development, from recently spawned eggs to the first juvenile stage, lasted 42 days at 26.0°C. Le developpement embryonnaire complet de Cherax quadricarinatus, l'ecrevisse a pinces rouges, est decrit a partir des changements morphologiques externes. Les stades anterieurs a l'eclosion sont definis par rapport au pourcentage de temps du developpement embryonnaire. Dix stades avant eclosion et trois apres eclosion sont decrits et illustres. Le developpement embryonnaire des oeufs recemment pondus au premier stade juvenile, a dure 42 jours a 26.0°C.