Abstract
Alpheus cedrici sp. n. is described based on two specimens collected under rocks while scuba diving off the coast of Ascension Island, central Atlantic Ocean. The new species belongs to the Alpheus macrocheles (Hailstone, 1835) species complex and appears to be most closely related to the eastern–central Atlantic Alpheus macrocheles, the western Atlantic Alpheus amblyonyx Chace, 1972, and the eastern Pacific Alpheus bellimanus Lockington, 1877 and Alpheus rectus Kim & Abele, 1988. However, it differs from all these species by a combination of morphological characters and by a diagnostic and striking colour pattern.
Highlights
The current knowledge of the alpheid shrimp fauna of the isolated central Atlantic islands St
The majority of species in the A. macrocheles complex are found in the Atlantic Ocean: A. macrocheles (EA, CA), A. platydactylus Coutière, 1897 (EA), A. amblyonyx Chace 1972 (WA), A. lentiginosus Anker & Nizinski, 2011 (WA), A. puapeba Christoffersen, 1979 (WA), A. pouang Christoffersen, 1979 (WA), and A. cedrici sp. n. (CA)
N. can be separated from the Indo-West Pacific A. albatrossae by the presence of a distinct shoulder on the ventrolateral surface of the minor chela palm (absent in A. albatrossae); the stouter fingers of the minor chela; and the absence of a small unguis on the dorsal margin of the dactylus of the third to fifth pereiopods (present in A. albatrossae)
Summary
The current knowledge of the alpheid shrimp fauna of the isolated central Atlantic islands St.
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