Cryptic speciation in the giant Antarctic isopod Glyptonotus antarcticus (Isopoda: Valvifera: Chaetiliidae)

By Christoph Held, Johann-Wolfgang Wägele, Lehrstuhl für Spezielle Zoologie. 2005

156 citations recorded by the source corpus.

SUMMARY: The genus Glyptonotus is most commonly regarded as monospecific, with Glyptonotus antarcticus Eights 1852 being its only constituent. Two more forms (G. acutus, G. antarcticus var. obtusus) that had been described based on morphological evidence have received little attention in the literature, though no formal attempt to evaluate their taxonomic status has been undertaken. In a survey of within-species genetic diversity, 23 specimens of the benthic Antarctic isopod Glyptonotus antarcticus from three sampling areas around the Antarctic had a high genetic variability in their mitochondrial LSU (16S) gene. Eleven unique mitochondrial haplotypes were found, two at the Antarctic Peninsula (AP), two in the Ross Sea (RS) and seven in the Eastern Weddell Sea (EWS). Average haplotype variation within sampling areas (AP, RS, EWS) was one order of magnitude less than between sampling areas. In the EWS, however, two highly differentiated haplotypes co-exist. These four groups of haplotypes may represent cryptic, but reproductively isolated species rather than a single species.

Subfields: Ecology, Genetics, Oceanography

View Paper: https://www.semanticscholar.org/paper/b256baafeaf3f42bf85ca500e26c3dc9f8a85ab4

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In Ecology

1. A. Clarke
2. J. Gili
3. Bruno Danis
4. C. Orejas
5. C. Broyer
6. W. Arntz
7. Huw Griffiths
8. N. Teixidó

In Genetics

1. Z. Nagy
2. François Michonneau
3. S. Thatje
4. Gustav Paulay
5. A. Clarke
6. G. Sonet
7. J. Gili
8. Bruno Danis

In Oceanography

1. J. Gili
2. A. Clarke
3. Bruno Danis
4. C. Broyer
5. Huw Griffiths
6. C. Orejas
7. W. Arntz
8. J. Gutt

Citations in the corpus

• DNA barcoding reveals new insights into the diversity of Antarctic species of Orchomene sensu lato (Crustacea: Amphipoda: Lysianassoidea) (2011, background): “This is the case for several Antarctic organisms: isopods (Held, 2003; Held and Wägele, 2005; Raupach and Wägele, 2006; Raupach et al., 2007; Brökeland and Raupach, 2008), molluscs (Beaumont and Wei, 1991; Page and Linse, 2002; Allcock et al.”
• The Antarctic region as a marine biodiversity hotspot for echinoderms: Diversity and diversification of sea cucumbers (2011, background): “, 2007) and isopods (Held and Wägele, 2005; Raupach and Wägele, 2006), show substantial allopatric genetic structuring.”
• The Antarctic-Magellan connection: Macrobenthos ecology on the shelf and upper slope, a progress report (2005, methodology): “At least four species seem to form the Glyptonotus antarcticus group (Held and Wägele, 2005).”
• Quantifying Antarctic marine biodiversity: The SCAR-MarBIN data portal (2011, background): “…work is starting to uncover a wealth of cryptic species within what were once regarded as single widely-distributed species (Mahon et al., 2008; Held and Wägele, 2005); not only does this work increase the known species richness of the Southern Ocean, but it also influences biogeographic…”