Heterochrony repolarized: a phylogenetic analysis of developmental timing in plethodontid salamanders

Table 1 Tests of alternative ancestral life history modes for select plethodontid nodes

Node / Life history	Prob.	hm	LBf
Root: Plethodontidae
Direct development	0.90	−44.29	0.00
Biphasic	0.10	−46.82	5.05
Paedomorphic	0.00	−52.36	16.15
Node A: Spelerpini
Direct development	0.01	−51.65	15.35
Biphasic	0.98	−43.98	0.00
Paedomorphic	0.01	−51.52	15.09
Node B: *Eurycea quadridigitata* + Edwards Plateau *Eurycea*
Direct development	0.00	−55.13	21.74
Biphasic	0.96	−44.26	0.00
Paedomorphic	0.04	−51.07	13.65
Node C: western *Eurycea quadridigitata* + Edwards Plateau *Eurycea*
Direct development	0.00	−55.49	22.55
Biphasic	0.75	−44.22	0.00
Paedomorphic	0.25	−49.65	10.86
Node D: Edwards Plateau *Eurycea*
Direct development	0.00	−59.97	31.26
Biphasic	0.00	−48.95	9.23
Paedomorphic	1.00	−44.33	0.00
Node E: southern Edwards Plateau *Eurycea*
Direct development	0.00	−65.99	43.89
Biphasic	0.00	−53.00	17.92
Paedomorphic	1.00	−44.04	0.00

Proportional probabilities are from Bayesian reconstructions of three ordered life history states (direct development, biphasic, and paedomorphic; Figure 2). Model fitting comparisons were performed by fixing (‘fossilizing’) select nodes to the three alternative life history states and comparing Log Bayes Factors (LBf) to the lowest (best fitting) life history for the node.

ISSN: 2041-9139