Rediscovery of Eunoe crassa and clarification of some morphological features (Annelida: Aphroditiformia: Polynoidae)

Aaron Treadwell described Lagisca crassa from Punta Arenas, Chile 100 years ago, based on an incomplete specimen. The species was later regarded as belonging in Eunoe Malmgren, 1865, but the species has not been found after its original description. The rediscovery of specimens collected in Punta Arenas has allowed us to evaluate its morphology to clarify some incompletely known features. Further, a comparison of the holotype of L. crassa with specimens of Hermadion magalhaensi Kinberg, 1856, led us to conclude these 2 species-group names are synonyms. We provide additional information and illustrations, and make some remarks on Eunoe and Hermadion Kinberg, 1856.