Received: 29 November 2018 | Revised: 18 December 2018 | Accepted: 1 February 2019 DOI: 10.1111/jbi.13551 SPECIAL ISSUE The shape of biogeography: Endemism, maps, and classification of fish distributions in the western Pacific Lynne R. Parenti Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Abstract Institution, Washington, District of Columbia Aim: The aim of this study is to describe and illustrate with maps the distribution and Correspondence shape of biotic areas of endemism of fish clades in the western Pacific, including East Lynne R. Parenti, Department of Asia and Australasia. This study also depicts the allopatric or sympatric distributions Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, of major subclades and makes general statements about the shared history among Washington, DC. the areas using information provided by the shape of the distributions, phylogeny, Email:
[email protected] and geology. This study also tests the hypothesis that Australasia is a locus of survival Editor: Dr. Malte Ebach or differentiation for inferred “basal” subclades of global taxa. Location: Western Pacific. Taxa: Teleost fishes. Methods: Clades are mapped to illustrate the shape of their distribution and to infer the shared relationships among distribution, phylogeny, and geology. Phylogenetic hypotheses for groups of taxa are converted into area cladograms which are used to summarize area relationships. This information is compared with that from other clades, ecology, and geology, to make general statements about the biogeographical history of the fish biota. Results: The distribution of each clade has an identifiable shape. The “basal” sub- clades of many widespread teleost fish taxa are endemic to the western Pacific, in- cluding East Asia and Australasia; hence, this is the inferred location of a principal vicariant event for each clade.