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| Acutocoxae ogilvieae Horton, Ashford & Thurston
in Ashford, Horton, ... et Brandt, 2019.
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Abstract
The amphipod family Podosiridae is unusual in that it combines morphological elements of the disparate families Podoceridae and Eusiridae. Here, we describe a new species in the family from specimens collected from the Southern Ocean in the vicinity of the South Orkney Islands and South Shetland Islands. We present mitochondrial (COI and 16S) and nuclear (18S) nucleic acid sequences for this and a congeneric species and use these to investigate the phylogenetic placement of Podosiridae within the Amphipoda. Our results do not provide evidence for a close relationship between Podosiridae and Podoceridae or Eusiridae, suggesting that the superficial similarity between these families is the result of morphological convergence. Instead, it is likely that Podosiridae are more closely related to families within Amphilochidira, such as Stenothoidae. Definitive placement of Podosiridae in the Amphipoda awaits further specimen collection, additional nucleotide data (including sequences from the Hyperiopsidae and the Vitjazianidae) and a more directed analysis of relationships within this portion of the amphipod phylogeny.
Keywords: Acutocoxae ogilvieae, molecular phylogeny, South Orkney Islands
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| Figure 2. Photograph of Acutocoxae ogilvieae holotype; adult female, 25.3 mm, lateral view. |
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| Figure 6. Acutocoxae ogilvieae holotype; adult female, 25.3 mm, habitus, lateral view. |
SYSTEMATICS
Order Amphipoda Latreille, 1816
Suborder Hyperiopsidea Bovallius, 1886
Infraorder Hyperiopsida Bovallius, 1886
Parvorder Podosiridira Lowry & Myers, 2012
Superfamily Podosirioidea Lowry & Myers, 2012
Family Podosiridae Lowry & Myers, 2012 (amended)
Debroyeridae Rauschert, 2017: 11 (nomen nudum)
Genus Acutocoxae Rauschert, 2017 (amended)
Type species: Acutocoxae weddellensis Rauschert, 2017.
Acutocoxae ogilvieae Horton, Ashford & Thurston sp. nov.
Etymology This species is named as a noun in a genitive case after the maiden name (Ogilvie) of Imogen Catherine Rachel Ashford, wife to author O.S.A.
Oliver S. Ashford, Tammy Horton, Christopher N. Roterman, Michael H. Thurston, Huw J. Griffiths and Angelika Brandt. 2019. A New Southern Ocean Species in the Remarkable and Rare Amphipod Family Podosiridae (Crustacea: Amphipoda) questions existing Systematic Hypotheses. Zoological Journal of the Linnean Society. zlz145. DOI: 10.1093/zoolinnean/zlz145
New Antarctic Crustacean Species sea-technology.com/new-antarctic-crustacean-species via @SeaTechnology
