Megalopal and first crab stage morphology of Cyrtograpsus angulatus Dana was studied in specimens from Mar Chiquita Lagoon, Argentina and an identification key for the megalopae of the four southwestern Atlantic varunid crabs is proposed. Some anomalous first crabs were observed that differed in the carapace shape and in the orientation of the ocular peduncle. These crabs survived in laboratory cultures, molting to the following stage with normal aspect. An anomalous Chasmagnathus granulatus first crab was also found in the field. We speculate that these odd crabs appeared after a complete, but defective, ecdysis. Since the ultimate body structures to be separated from the exuvia are probably the cephalic appendages and the eyes, their survival in the field would be difficult since vision may help them to detect predators.
How to translate text using browser tools
1 January 2007
MORPHOLOGY OF MEGALOPA AND FIRST CRAB OF CYRTOGRAPSUS ANGULATUS, WITH COMMENTS ON THE PRESENCE OF AN ANOMALOUS FIRST CRAB STAGE IN BRACHYURAN CRABS
Tomás A. Luppi,
Eduardo D. Spivak
ACCESS THE FULL ARTICLE
It is not available for individual sale.
This article is only available to subscribers.
It is not available for individual sale.
It is not available for individual sale.
Journal of Crustacean Biology
Vol. 27 • No. 1
January 2007
Vol. 27 • No. 1
January 2007