NEW COPEPOD PARASITES OF ISACIA CONCEPTIONIS (PERCIFORMES: HAEMULIDAE) COLLECTED IN NORTHERN CHILE AND A REEXAMINATION OF CLAVELLA SIMPLEX (CASTRO ET BAEZA, 1985) USING SCANNING ELECTRON MICROSCOPY

MONTES M MARTIN; CASTRO RAUL; MARTORELLI SERGIO R

Valencia

Simposio; 9th International Symposium on Fish Parasites Valencia 2015; 2015

CSIC- Univ. de Valenciam

Copepods were collected from recently captured fish, Isacia conceptionis, from northern Chile, fixed in 70% alcohol andthen appendages dissected. Some fixed specimens were dehydrated in a series of increasing concentrations of ethanol,dried to a critical point and studied by scanning electron microscope. The first type of specimens were first determinedas Clavella simplex Castro et Baeza, 1985, and presents more simple characteristics than other Clavella sp., including thearmature and segmentation of antennules, the endopod armature of antenna, and diminutive bulla. Thesecharacteristics have precluded inclusion of this species in Clavella Oken 1815. Although this simple characteristic leadsus to believe this species belong to a new genus in the Clavella branch. Another type specimen was detected inhabitingthe olfactory sacs and included in the Clavella branch. Yet there is no other genus or species in the Clavella branch thatcolonizes such a particular site. Several characteristics differentiate this last specimen from all other Clavella branchgenera, including antennae with exopods shorter than endopods, a large lobular projection and smaller subcircularprojection at the base of the cephalothorax, a subspherical and flat bulla, mandibles without secondary dentition, and asuboval male body type with two modified caudal rami. Males of both types of specimens differ from each other inseveral ways (e.g. the position of the buccal area, oriented ventrally in the first while distally in the second type and thislast with caudal rami).