Green algal infection of American horseshoe crab (Limulus polyphemus) exoskeletal structures.

Degenerative lesions in the dorsum of the horseshoe crab (Limulus polyphemus) exoskeleton, eyes, arthrodial membrane, and base of the telson were documented in a population of wild caught laboratory animals. The disease can lead to loss of tissue structure and function, deformed shells, abnormal molting, loss of ocular structures, erosion of interskeletal membranes, and cardiac hemorrhage. Microscopy, histopathology, and in vitro culture confirmed the causative agent to be a green algae of the family Ulvaceae.

A Viral Disease of the Ivory Barnacle, Balanus eburneus, Gould (Crustacea, Cirripedia).

The known diseases of the Class Cirripedia are reviewed. A previously unreported viral disease of the ivory barnacle, Balanus eburneus is described. The results of light and electron microscopic examinations of viral-infected tissues of an ivory barnacle are reported.