Abstract
A new species of Sarsamphiascus Huys, 2009 was collected from sandy sediments of Hawaii at 12 –18 m depth. While the new species, Sarsamphiascus hawaiiensis sp. nov., is morphologically most closely related to S. kawamurai (Ueda & Nagai, 2005), the two species can be distinguished by the combination of the following morphological characteristics: elongated segments of the antennule in the new species, type of outer setae of the P5 exopod (bare in S. kawamurai), position of the inner seta of the P5 exopod in both sexes (more proximal in S. kawamurai), length and type of the setae of female P6 (shorter and bare in S. kawamurai). This is the first species of Sarsamphiascus from Hawaii to be discovered. Molecular analyses of mitochondrial cytochrome c oxidase subunit I (mtCOI) and nuclear 18S ribosomal RNA (18S rRNA) genes confirmed that S. hawaiiensis and S. kawamurai are distinct species.
Highlights
IntroductionMiraciidae Dana, 1846 is a large family of benthic copepods in the order Harpacticoida (Boxshall & Halsey, 2004)
The genus Sarsamphiascus was established by Huys (2009), with Dactylopus minutus Claus, 1863 designated the type species
The new species described here clearly belongs to the genus Sarsamphiascus based on the presence of several diagnostic characters for the genus including P1 enp-1 longer than exp, P1 exp-3 with five setae, every exp-1, 2 with inner seta, P2 enp-2 with two inner setae, P3 enp-3 with three inner setae, and P4 enp shorter than exp
Summary
Miraciidae Dana, 1846 is a large family of benthic copepods in the order Harpacticoida (Boxshall & Halsey, 2004). It includes 50 valid genera and 426 species (Song, Rho & Kim, 2007; Wells, 2007; Huys & Mu, 2008; Chullasorn et al, 2011; Karanovic & Cooper, 2012; Sönmez, Sak & Karaytuğ, 2014), most of which were transferred from the former family Diosaccidae by Willen (2002). The genus Sarsamphiascus was established by Huys (2009), with Dactylopus minutus Claus, 1863 designated the type species. Amphiascus Sars, 1905 is a senior objective synonym of Paramphiascopsis Lang, 1944 and must be restricted to the species currently included in the latter. The new genus Sarsamphiascus was proposed to receive all remaining ‘‘orphaned’’ species included in Amphiascus (Huys, 2009)
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