Abstract
AbstractA new species of ampithoid amphipod, Sunamphitoe gigantea sp. nov., is described from Katsurakoi, Hokkaido, Japan. The new species most closely resembles S. eoa, but can be distinguished from it by the shorter flagellum of antenna 1, the maxilla 1 inner plate that bears two slender setae, the short dactylus of male gnathopod 2, and the presence of a group of long setae on anterior margins of pereopods 3 and 4 bases. Nucleotide sequences of mitochondrial cytochrome c oxidase subunit I obtained from the type specimens also differentiated this new species from the congeners. Ontogenetic morphological changes of the male gnathopod 2 are briefly discussed.
Highlights
The ampithoid genus Sunamphitoe Bate, 1857 is known to be comprised of large-bodied herbivorous amphipods often associated with brown algae, kelps (Poore et al, 2008; Peart, 2017)
Nucleotide sequences of mitochondrial cytochrome c oxidase subunit I (COI) obtained from the type specimens were provided for DNA barcoding
S. graxon S. namhaensis S. orientalis S. parmerong S. tea Ampithoe valida is much shorter than propodus (Figure 8A, B), while in large males, posterior margin of propodus is straight and the palm is obscure without spine, and dactylus is elongate reaching proximal end of propodus (Figure 8C)
Summary
The ampithoid genus Sunamphitoe Bate, 1857 is known to be comprised of large-bodied herbivorous amphipods often associated with brown algae, kelps (Poore et al, 2008; Peart, 2017). An extremely large-bodied Sunamphitoe species (maximum length, more than 40 mm) was found on the surface of a kelp Saccharina longissima which was collected by the second author from Katsurakoi, south-east coast of Hokkaido, Japan.
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