Rollers courol hoopoe woodhoopoes hornbi lls

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Unformatted text preview: oodpeckers and allies: wrynecks, piculets,barbets, toucans, honeyguides, jacamars, puffbi rds Perching birds, songbirds, passerines DNA taxonomy • DNA-DNA hybridization – Sibley and Ahlquist (80s and 90s) • Tree of Life project – nucleotide sequences in handful of coding regions • 19 genes on 14 chromosomes • • • 3 people agree on alignment 2n in birds varies from ~60 to 135ish ~21k bp per taxa • so ~ 500k bp total Bird phylogeny • A great deal of uncertainty – Rapid radiation following Cretaceous extinction • Perhaps more than one lineage made it through? • Convergence in form? • Class Aves is split into two superorders, Paleognathae and Neognathae – Difference is in the number and position of bones in the palate Additional levels of organization • Domain: Eukarya▪ • Kingdom: Animalia▪ – Phylum: Chordata▪ – Subphylum: Vertebrata▪ – Superclass: Gnathostomata/Tetropoda • Class: Aves • Subclass: Neornithes • Superorder: Neognathae • “Cohort” or “clade”: Neoaves • “Cohort” or “clade”: Coronaves or Metaves – Order » Family » Genus » species Two “Superorders” Three/Two “CLADES” or “COHORTS” Paleognathae Galloanserae Metaves (Neoaves) Coronaves Neognathae Aves Paleognathae Tinamiformes Stuthioniformes Rheiformes “Ratites” Casuariiformes Dinornithiformes Paleognathae Aves Paleognathae characteristics • distinctive palate • lack of flight (ratites) or poor flyers (tinamous) • keel absent (ratites) or poorly developed (tinamous) • ground dwelling • loss of toes – 2 in ostrich – 3 in rheas, emus and cassowaries – (4 in kiwis and (most) tinamous) • precocial young • may one day be more accurately split into two orders: – Tinamiformes (tinamous, 47 species) – Struthi...
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This note was uploaded on 01/04/2014 for the course BIO 340L taught by Professor Peterenglish during the Spring '10 term at University of Texas.

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