Abstract
Benthic harpacticoids were collected from Korean waters. Two species were identified as members of the genus Longipedia Claus, 1863, because they have an extremely elongated distal segment of the P2 endopod. Longipedia koreana sp. nov. is morphologically most closely related to L. nichollsi Wells, 1980 and L. scotti Sars, 1903, but it can clearly be distinguished from both species based on the following morphological characteristics: P1 coxa with strong spinules near the outer margin and the distal element being much bigger than the proximal elements, P2 coxa with a small inner seta on the anterior surface, P4 exopod first segment without an inner element, and the P5 with a rectangular exopod (more than 3.5 times as long as wide). L. ulleungensis sp. nov. is similar to L. brevispinosa Gurney, 1927, L. spinulosa Itô, 1981, and L. weberi Scott A., 1909. However, L. ulleungensis sp. nov. is characterized by the P2 coxa with a reduced inner seta, the P4 exopod second segment without an inner seta, and the anal operculum with a long median projection, a single spine, and a group of outer spines on each side. In a molecular analysis using the mitochondrial cytochrome c oxidase subunit I (COI) and 18S ribosomal RNA (18S rRNA) genes, the inter-specific variation was 22.525–23.102% and 1.325–1.382% of COI and 18S rRNA between the two new species, respectively. A key to the family Longipediidae is provided herein.
Highlights
Published: 19 November 2021The genus Longipedia Claus, 1863 is the sole genus in the family Longipediidae Boeck, 1865
Longipedia species are generally marine, but some species were reported from brackish waters: L. corteziensis Gómez, 2001 from a coastal lagoon in northwestern Mexico and L
Longipedia has been most frequently reported in Europe, North America, as well as in East Asia including Japan and Korea, and relatively few species have been reported from the southern hemisphere, e.g., L. nichollsi Wells, 1980 from Australia, L. santacruzensis
Summary
The genus Longipedia Claus, 1863 is the sole genus in the family Longipediidae Boeck, 1865. Longipedia has been most frequently reported in Europe, North America, as well as in East Asia including Japan and Korea, and relatively few species have been reported from the southern hemisphere, e.g., L. nichollsi Wells, 1980 from Australia, L. santacruzensis. Six species of the family Longipediidae have been reported in East Asia; Longipedia andamanica Wells, 1980 from Andaman Islands [1], Bay of Bengal [4], and. During a survey of benthic copepods from sublittoral zones in Korea, several specimens of the family Longipediidae were collected. These two new species are described and an updated identification key to species of the family is provided
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