| Abstrakt: |
The authors describe two new species of Colobomatus Hesse, 1873. The first, Colobomatus tenuis n. sp. is parasitic on Scartichthys viridis in waters off Antofagasta and Valparaíso and on Scartichthys gigas and Auchenionchus variolosus from Antofagasta. C. tenuis lives in the preopercular canals of its fish host. This new species has three simple cephalic processes, a characteristic shared with only three of its congeners (C. mylionus, C. sewelli, and C. sciaenae). However, C. tenuis can be differentiated from these other species by the shape of the head and of the trunk processes, especially the bifid thoracic posterior processes that are simple in the other species. The male can be easily differentiated from all species of the genus based on the shape and size of the uropods, which in the other species are longer than the last abdominal somite. Some females were observed with a pair of egg masses attached to the genital pore and another pair free in the preopercular canal with nauplii inside, implying that the oldest egg masses are released before the nauplii hatch from the eggs. The second new species, Colobomatus miniprocessus n. sp., inhabits the mandibular canals of Anisotremus scapularis. C. miniprocessus is characterized by a combination of characters, such as the abdominal processes that are large and blunt, the reduced bifid cephalic process, and the length of the thoracic anterior processes, all of which differentiate it from its closest congener, Colobomatus quadrifarius, which has been reported off the coast of Perú on the same host. The present report raises the known number of species of Colobomatus to 63. [ABSTRACT FROM AUTHOR] |
