First description of larvae of Bathylagichthys parini (Pisces, Bathylagidae) from the southeastern Pacific
Abstract:The early stages of development of Bathylagichthys parini Kobyliansky, 1990 are described for the first time on the basis of 69 larvae collected in the fjords of Chilean Patagonia. Morphometric and meristic data were obtained from a series of larvae between 5.3 and 25.4 mm in body length. Data are presented on the development of pigmentation patterns and the sequence of fin formation. The total number of vertebrae, fin rays, and branchiostegal rays in the more developed larvae coincided with those observed in adults of B. parini described for the Pacific Ocean bordering Chile, and Bathylagichthys australis Kobyliansky, 1990 from the south central Pacific and Indian oceans. Comparative details of the development of the supraorbital bone in relation to the orbit are useful in separating both species, as this characteristic in the transforming specimen described here is consistent with B. parini. Larvae of B. parini are differentiated from other species of Bathylagidae in the region by having elliptical eyes with ventral choroid tissue in the form of a teardrop and three branchiostegal rays instead of two. Also, they develop non-pedunculate eyes. Adults of B. parini have been recorded from the SE Pacific at 42°59′S, 80°15′W and also from fjords of southern Chile.
Document Type: Research Article
Publication date: 2005-09-01
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