PHYLOGENY OF EXTANT PENGUINS BASED ON INTEGUMENTARY AND BREEDING CHARACTERS

SARA B. BERTELLI; NORBERTO P. GIANNINI

AUK

Año: 2004 vol. 121 p. 422 - 434

0004-8038

A phylogeny of extant penguins (18 forms) was estimated on the basis of 70integumentary and breeding characters. Integumentary characters included structure andcolor of bill and legs, and plumage of adult, immature, and downy chick. Breeding charactersincluded eggs, nesting, and sociability of immatures. Gavia was placed at the root, and11 species of representative procellariiform groups completed the outgroup. A heuristicparsimony analysis under implied character weights was performed. Ingroup resolution wascomplete. The analysis recovered monophyly of Sphenisciformes and all the traditional genera.The ingroup topology was ((Eudyptula + Spheniscus) (Aptenodytes (Pygoscelis (Megadyptes +Eudyptes)))). Two suprageneric groups, (Eudyptula + Spheniscus) and (Megadyptes + Eudyptes), were well supported. Additional analyses under equal weights resulted in a consensus topology that diff ered only in the internal resolution of Spheniscus. Integumentary and breeding characters performed optimally at the ordinal and generic levels, and also provided resolution and varying degrees of support at the supra- and intrageneric levels.