Abstract
A new species of echinoderid kinorhynchs, Echinoderes ultraabyssalis sp. nov. collected from oxidized brown clay at the deepest depression of the Kuril-Kamchatka Trench, North-West Pacific, is described and illustrated using light and electron microscopy. This new representative of the largest kinorhynch genus is characterized by the unique set of spines and tubules and can be easily distinguished from other congeners. The first trunk segment shows remarkably wrinkled posterior margin with parallel cuticular notches; the second trunk segment bears pair of adhesive tubules in both sexes; trunk segment 5 with pair of tubules in lateroventral position; trunk segment 8 with lateral accessory tubules; trunk segment 9 with tubules in laterodorsal position; acicular lateroventral spines on trunk segments 6–9 and two acicular middorsal spines on trunk segments 6 and 8. This species is also well recognized by the presence of tooth-like middorsal protuberance on trunk segment 11. Echinoderes ultraabyssalis sp. nov. constitutes the deepest kinorhynch species described so far (9411–9541 m) and the first hadal representative of the Kinorhyncha in the World Ocean.
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