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Axiomatic Panbiogeography

offers an application of incidence geometry to historical biogeography by defining collection localities as points, tracks as lines and generalized tracks as planes.
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Incidence Geometry
Composite Construction
Orthogenesis
Quaternion Algebraic Geom
Vicariance
Primate Vicariances
Individual Track Construc
Generalized Tracks
Taxogeny
Nodes
Edges
Distributions
Pit-Vipers
Trees
Caecilians
GyrinophilusPseudotriton
Desmognathus
Urspelerpes
Erimystax
Plethodon
Eurycea
Mushrooms
Lizards
Crotalus
Other Salamanders
Salamandridae
Elaphe
Lampropeltis
Pseudoeurycea
Turtles
Ambystoma
Snakes
Elapids
Spiders
Ants
Butterflies and Moths
Crawfish
Isopod
Sculpins
Aneides
Noturus
Ambloplites
Frogs&Toads
Plants
Ostracods
Leavenworthia
Kinosternidae
Necturus
Phacelia
Odonates
Propositions
CREADer
Areas
Main Massings
Geology
Track Analysis and MetaCo
Martitrack Panbiogeograph
Applications
Work
Replies to Criticism
Multimodel Selection
Search Encounter
Cenomanian
TinkerPopPanbiogeography
Track Analysis beyond Pan

Necturus


N. lewisi splits from rest             N. punctatus splits                    "three-way split'


It may be possible to use the Darter distributions to sort out the "three-way split"".

"Analyses of
allozymic data (Guttman et al., 1990) and cytological data (Sessions and Wiley, 1985) agree that Necturus lewisi is the sister taxon to the remaining species of Necturus, and that N. punctatus is the sister lineage to a group including N. alabamensis, N. beyeri and N. maculosus. The allozymic data indicate that the lineages leading to N. alabamensis, N. beyeri and N. maculosus approximate a three-way split, and slightly favor a sister grouping of N. alabamensis and N. beyeri relative to N. maculosus. The cytological study of Sessions and Wiley (1985) groups N. beyeri with N. maculosus rather than with N. alabamensis. Relationships among the latter three species are perhaps best viewed as approximating a three-way split, with the alternative hypotheses derived from the allozymic and cytological data being tentative and in need of further testing."