Tags

Type your tag names separated by a space and hit enter

Time flies, a new molecular time-scale for brachyceran fly evolution without a clock.
Syst Biol. 2003 Dec; 52(6):745-56.SB

Abstract

The insect order Diptera, the true flies, contains one of the four largest Mesozoic insect radiations within its suborder Brachycera. Estimates of phylogenetic relationships and divergence dates among the major brachyceran lineages have been problematic or vague because of a lack of consistent evidence and the rarity of well-preserved fossils. Here, we combine new evidence from nucleotide sequence data, morphological reinterpretations, and fossils to improve estimates of brachyceran evolutionary relationships and ages. The 28S ribosomal DNA (rDNA) gene was sequenced for a broad diversity of taxa, and the data were combined with recently published morphological scorings for a parsimony-based phylogenetic analysis. The phylogenetic topology inferred from the combined 28S rDNA and morphology data set supports brachyceran monophyly and the monophyly of the four major brachyceran infraorders and suggests relationships largely consistent with previous classifications. Weak support was found for a basal brachyceran clade comprising the infraorders Stratiomyomorpha (soldier flies and relatives), Xylophagomorpha (xylophagid flies), and Tabanomorpha (horse flies, snipe flies, and relatives). This topology and similar alternative arrangements were used to obtain Bayesian estimates of divergence times, both with and without the assumption of a constant evolutionary rate. The estimated times were relatively robust to the choice of prior distributions. Divergence times based on the 28S rDNA and several fossil constraints indicate that the Brachycera originated in the late Triassic or earliest Mesozoic and that all major lower brachyceran fly lineages had near contemporaneous origins in the mid-Jurassic prior to the origin of flowering plants (angiosperms). This study provides increased resolution of brachyceran phylogeny, and our revised estimates of fly ages should improve the temporal context of evolutionary inferences and genomic comparisons between fly model organisms.

Authors+Show Affiliations

Department of Entomology, North Carolina State University, Raleigh, North Carolina 27695, USA. bwiegman@unity.ncsu.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

14668115

Citation

Wiegmann, Brian M., et al. "Time Flies, a New Molecular Time-scale for Brachyceran Fly Evolution Without a Clock." Systematic Biology, vol. 52, no. 6, 2003, pp. 745-56.
Wiegmann BM, Yeates DK, Thorne JL, et al. Time flies, a new molecular time-scale for brachyceran fly evolution without a clock. Syst Biol. 2003;52(6):745-56.
Wiegmann, B. M., Yeates, D. K., Thorne, J. L., & Kishino, H. (2003). Time flies, a new molecular time-scale for brachyceran fly evolution without a clock. Systematic Biology, 52(6), 745-56.
Wiegmann BM, et al. Time Flies, a New Molecular Time-scale for Brachyceran Fly Evolution Without a Clock. Syst Biol. 2003;52(6):745-56. PubMed PMID: 14668115.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Time flies, a new molecular time-scale for brachyceran fly evolution without a clock. AU - Wiegmann,Brian M, AU - Yeates,David K, AU - Thorne,Jeffrey L, AU - Kishino,Hirohisa, PY - 2003/12/12/pubmed PY - 2004/2/21/medline PY - 2003/12/12/entrez SP - 745 EP - 56 JF - Systematic biology JO - Syst. Biol. VL - 52 IS - 6 N2 - The insect order Diptera, the true flies, contains one of the four largest Mesozoic insect radiations within its suborder Brachycera. Estimates of phylogenetic relationships and divergence dates among the major brachyceran lineages have been problematic or vague because of a lack of consistent evidence and the rarity of well-preserved fossils. Here, we combine new evidence from nucleotide sequence data, morphological reinterpretations, and fossils to improve estimates of brachyceran evolutionary relationships and ages. The 28S ribosomal DNA (rDNA) gene was sequenced for a broad diversity of taxa, and the data were combined with recently published morphological scorings for a parsimony-based phylogenetic analysis. The phylogenetic topology inferred from the combined 28S rDNA and morphology data set supports brachyceran monophyly and the monophyly of the four major brachyceran infraorders and suggests relationships largely consistent with previous classifications. Weak support was found for a basal brachyceran clade comprising the infraorders Stratiomyomorpha (soldier flies and relatives), Xylophagomorpha (xylophagid flies), and Tabanomorpha (horse flies, snipe flies, and relatives). This topology and similar alternative arrangements were used to obtain Bayesian estimates of divergence times, both with and without the assumption of a constant evolutionary rate. The estimated times were relatively robust to the choice of prior distributions. Divergence times based on the 28S rDNA and several fossil constraints indicate that the Brachycera originated in the late Triassic or earliest Mesozoic and that all major lower brachyceran fly lineages had near contemporaneous origins in the mid-Jurassic prior to the origin of flowering plants (angiosperms). This study provides increased resolution of brachyceran phylogeny, and our revised estimates of fly ages should improve the temporal context of evolutionary inferences and genomic comparisons between fly model organisms. SN - 1063-5157 UR - https://www.unboundmedicine.com/medline/citation/14668115/Time_flies_a_new_molecular_time_scale_for_brachyceran_fly_evolution_without_a_clock_ L2 - http://www.arb-silva.de/search/show/lsu/pubid/14668115 DB - PRIME DP - Unbound Medicine ER -