Table 2.

Diversification tests using genus specific speciation and extinction rate-constant models.

Package	Function	IST	Model	Arion (A)		Geomalacus (G)		AIC	Δ AIC
				λ	μ	λ	μ
diversitree	make.bd.split	yes	Pure-birth (λA, λG)	0.146	‡	0.433	‡	30.458	1.800
diversitree	make.bd.split	yes	Constrained pure-birth (λA = λ G)	0.144	‡	0.144	‡	28.460	0.000
diversitree	make.bd.split	yes	Birth-death (λA, λG, μA, μG)	0.146	0.000	0.143	0.000	34.458	5.810

Bold  identifies the best-fit model. AIC’s and the difference in AIC’s with the best model (∆AIC) are shown. IST, incomplete sampling taxa; λA, the initial speciation rate in Arion; λG, the initial speciation rate in Geomalacus; μ ₀A, the initial extinction rate in Arion; μ ₀G, the initial extinction rate in Geomalacus; λ, the initial speciation rate; μ, the initial extinction rate; ‡ in the pure-birth model, extinction is fixed to zero.