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Eleven species of Dirivultidae (Copepoda: Siphonostomatoida) have been found at deep-sea vent areas on the Mid-Atlantic Ridge at the Snake Pit site, 23°23′N, 44°56′W, depth 3,500 m, and near the Azores at the Lucky Strike site, 37°N, 32°W, depth 1,620 m.
Rimipontius mediospinifer new genus, new species, is characterized by the formula 0-0; I for the endopod of leg 4 and by the presence of five setae on each caudal ramus. Aphotopontius atlanteus new species is distinguished by the length of the caudal ramus and by details of the
genital double-somite in the female. Stygiopontius cladarus new species is noted for its small subdrate caudal ramus; S. serratus new species for the serrate nature of posterior margin of the antennule; S. teres new species in the female for its smooth expansions of the
genital double-somite and the angular margin on leg 5; S. regius new species for its large broad undivided leg 5 in the female and its irregularly shaped spermatophore; S. bulbisetiger new species for the bulbous setae on the antenna; S. mirus new species for the prolongation
of the coxa of the maxilliped with a terminal clawlike process; and S. latulus new species for the unusually broad prosome. Two copepods show a disjunct distribution: Aphotopontius forcipatus Humes, 1987, previously known only from the northeastern Pacific, is reported for the
first time in the Atlantic; Stygiopontius pectinatus Humes, 1987, reported originally from the Mid-Atlantic Ridge and known also from the Mariana Back-Arc Basin, is recorded in large numbers from the hydrothermal site at 23°23′N, 44°56′W.
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