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What lies beneath: molecular phylogenetics and ancestral state reconstruction of the ancient subterranean Australian Parabathynellidae (Syncarida, Crustacea).
Mol Phylogenet Evol. 2012 Jul; 64(1):130-44.MP

Abstract

The crustacean family Parabathynellidae is an ancient and significant faunal component of subterranean ecosystems. Molecular data were generated in order to examine phylogenetic relationships amongst Australian genera and assess the species diversity of this group within Australia. We also used the resultant phylogenetic framework, in combination with an ancestral state reconstruction (ASR) analysis, to explore the evolution of two key morphological characters (number of segments of the first and second antennae), previously used to define genera, and assess the oligomerization principle (i.e. serial appendage reduction over time), which is commonly invoked in crustacean systematics. The ASR approach also allowed an assessment of whether there has been convergent evolution of appendage numbers during the evolution of Australian parabathynellids. Sequence data from the mtDNA COI and nDNA 18S rRNA genes were obtained from 32 parabathynellid species (100% of described genera and ~25% of described species) from key groundwater regions across Australia. Phylogenetic analyses revealed that species of each known genus, defined by traditional morphological methods, were monophyletic, suggesting that the commonly used generic characters are robust for defining distinct evolutionary lineages. Additionally, ancestral state reconstruction analysis provided evidence for multiple cases of convergent evolution for the two morphological characters evaluated, suggesting that caution needs to be shown when using these characters for elucidating phylogenetic relationships, particularly when there are few morphological characters available for reconstructing relationships. The ancestral state analysis contradicted the conventional view of parabathynellid evolution, which assumes that more simplified taxa (i.e. those with fewer-segmented appendages and setae) are derived and more complex taxa are primitive.

Authors+Show Affiliations

Australian Centre for Evolutionary Biology and Biodiversity, School of Earth and Environmental Science, The University of Adelaide, SA 5005, Australia. kym.abrams@adelaide.edu.auNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22465443

Citation

Abrams, K M., et al. "What Lies Beneath: Molecular Phylogenetics and Ancestral State Reconstruction of the Ancient Subterranean Australian Parabathynellidae (Syncarida, Crustacea)." Molecular Phylogenetics and Evolution, vol. 64, no. 1, 2012, pp. 130-44.
Abrams KM, Guzik MT, Cooper SJ, et al. What lies beneath: molecular phylogenetics and ancestral state reconstruction of the ancient subterranean Australian Parabathynellidae (Syncarida, Crustacea). Mol Phylogenet Evol. 2012;64(1):130-44.
Abrams, K. M., Guzik, M. T., Cooper, S. J., Humphreys, W. F., King, R. A., Cho, J. L., & Austin, A. D. (2012). What lies beneath: molecular phylogenetics and ancestral state reconstruction of the ancient subterranean Australian Parabathynellidae (Syncarida, Crustacea). Molecular Phylogenetics and Evolution, 64(1), 130-44. https://doi.org/10.1016/j.ympev.2012.03.010
Abrams KM, et al. What Lies Beneath: Molecular Phylogenetics and Ancestral State Reconstruction of the Ancient Subterranean Australian Parabathynellidae (Syncarida, Crustacea). Mol Phylogenet Evol. 2012;64(1):130-44. PubMed PMID: 22465443.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - What lies beneath: molecular phylogenetics and ancestral state reconstruction of the ancient subterranean Australian Parabathynellidae (Syncarida, Crustacea). AU - Abrams,K M, AU - Guzik,M T, AU - Cooper,S J B, AU - Humphreys,W F, AU - King,R A, AU - Cho,J-L, AU - Austin,A D, Y1 - 2012/03/29/ PY - 2011/10/28/received PY - 2012/01/27/revised PY - 2012/03/18/accepted PY - 2012/4/3/entrez PY - 2012/4/3/pubmed PY - 2012/9/6/medline SP - 130 EP - 44 JF - Molecular phylogenetics and evolution JO - Mol. Phylogenet. Evol. VL - 64 IS - 1 N2 - The crustacean family Parabathynellidae is an ancient and significant faunal component of subterranean ecosystems. Molecular data were generated in order to examine phylogenetic relationships amongst Australian genera and assess the species diversity of this group within Australia. We also used the resultant phylogenetic framework, in combination with an ancestral state reconstruction (ASR) analysis, to explore the evolution of two key morphological characters (number of segments of the first and second antennae), previously used to define genera, and assess the oligomerization principle (i.e. serial appendage reduction over time), which is commonly invoked in crustacean systematics. The ASR approach also allowed an assessment of whether there has been convergent evolution of appendage numbers during the evolution of Australian parabathynellids. Sequence data from the mtDNA COI and nDNA 18S rRNA genes were obtained from 32 parabathynellid species (100% of described genera and ~25% of described species) from key groundwater regions across Australia. Phylogenetic analyses revealed that species of each known genus, defined by traditional morphological methods, were monophyletic, suggesting that the commonly used generic characters are robust for defining distinct evolutionary lineages. Additionally, ancestral state reconstruction analysis provided evidence for multiple cases of convergent evolution for the two morphological characters evaluated, suggesting that caution needs to be shown when using these characters for elucidating phylogenetic relationships, particularly when there are few morphological characters available for reconstructing relationships. The ancestral state analysis contradicted the conventional view of parabathynellid evolution, which assumes that more simplified taxa (i.e. those with fewer-segmented appendages and setae) are derived and more complex taxa are primitive. SN - 1095-9513 UR - https://www.unboundmedicine.com/medline/citation/22465443/What_lies_beneath:_molecular_phylogenetics_and_ancestral_state_reconstruction_of_the_ancient_subterranean_Australian_Parabathynellidae__Syncarida_Crustacea__ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1055-7903(12)00115-7 DB - PRIME DP - Unbound Medicine ER -