Red swamp crayfish (Procambarus clarkii) is the most cultivated crayfish species in the world that has commercial importance for both aquaculture and aquarium industries. In this study, a case report of an appendage abnormality observed in the left cheliped of a female specimen (6.92 g) reared under laboratory conditions is presented. It has been determined that the specimen has two appendages in the left cheliped root. Of these appendages, the right one (1.27 cm) ends in a blunt. On the left (1.06 cm), a spiny structure similar to that of the fourth and fifth walking legs was observed.
Kırmızı bataklık kereviti (Procambarus clarkii), hem su ürünleri yetiştiriciliği hem de akvaryum sektörleri için ticari öneme sahip olan ve dünyada en fazla üretimi yapılan kerevit türüdür. Bu çalışmada, laboratuvar koşullarında yetiştirilen bir dişi bireyin (6,92 g) sol kıskacında gözlemlenen ekstremite anormalliği hakkında vaka takdimi sunulmuştur. Bireyin sol kıskaç kökünde iki uzantı oluştuğu tespit edilmiştir. Bu uzantılardan sağdaki (1,27 cm) küt bir şekilde sonlanmıştır. Soldakinde (1,06 cm) ise, dördüncü ve beşinci yürüme bacaklarındakine benzer dikenli bir yapı görülmüştür.
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