Cancrincolidae (Copepoda, Harpacticoida) associated with land crabs: a semiterrestrial leaf of the ameirid tree

Molecular Phylogenetics and Evolution
Rony HuysJulia Llewellyn-Hughes

Abstract

Morphological evidence suggests harpacticoid copepods have recurrently entered into symbiosis with other crustaceans but only members of the family Cancrincolidae have successfully made the transition from marine habitats to semiterrestrial hosts. Cancrincolids are primarily amphi-Atlantic in distribution (with one outlier in the western Pacific) and typically inhabit the gill chambers of grapsoidean land crabs belonging to the families Grapsidae, Sesarmidae, Varunidae and Gecarcinidae. Morphologically, they are difficult to place because they exhibit unusual autapomorphies and the shared derived characters claimed to unite them with the primitively marine Ameiridae are equivocal. Both maximum parsimony and Bayesian inference solutions based on SSU rDNA gene sequences show topological congruence in placing the Cancrincolidae within the Ameiridae and in firmly resolving it as the sistergroup of taxa that have been reported as obligate or commensal associates of crayfish. This relationship is further supported by swimming leg sexual dimorphism and mandibular palp morphology. Morphological comparison with ameirid copepods revealed the majority of synapomorphies previously proposed in support of cancrincolid monophyly and familial ...Continue Reading

References

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Citations

Sep 30, 2014·Arthropod Structure & Development·Tomislav Karanovic, Kichoon Kim
Aug 24, 2017·Scientific Reports·Sahar KhodamiPedro Martinez Arbizu

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