Abstract
Magellanic tanaidacean faunas have been mainly studied in the Magellan Strait and Beagle Channel, the latter restricted to bot-toms deeper than 40m. As a result, the shallow rocky bottoms of the Magellanic fjords remain largely under-studied, and theirtanaidacean diversity is poorly known. In this study, tanaidacean species sampled from shallow rocky bottoms of Chilean fjordsare investigated, and morphological and taxonomic considerations included. A new species of the Tanaidae, Zeuxoides tronco-soi sp. nov. is described. The genus Leptochelia is recorded for the first time in Chile, and the distribution of Pancoloides lito-ralis is extended northwards. Specimens collected of Pancoloides litoralis and Nototanais dimorphus present morphologicaldifferences with previous descriptions, which are at present attributed to intraspecific variation derived from geographical iso-lation among populations, until sufficient material can be examined to determine what constitutes interspecific and intraspecific variation.
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