Conjoined twins in Aegla uruguayana Schmitt, 1942 (Decapoda: Anomura: Aeglidae)

Abstract

The first instance of a pair of conjoined embryos in Aegla uruguayanaSchmitt, 1942 is reported. Collected in a stream in Entre Ríos province, Argentina, the embryos were detected among 550 eggs containing embryos with normal morphological development, and constitute the second observed case of twins in AeglaLeach, 1820. The twins were joined together by their dorsum and lived for a few days in the laboratory; however, they did not hatch, dying inside the egg envelope.