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Table S1 Summary statistics from nine microsatellite DNA loci genotyped for 501 larvae of T. synthetica (= 99) and T. antithetica (= 402), including number of alleles (NA), expected heterozygosity (HE), and observed heterozygosity (HO). Significant deviations from HWE after Bonferroni correction for multiple tests (< 0.005) are indicated by an asterisk (*) next to values for HO. Maximum likelihood estimates of null allele frequencies, allelic dropout rates, and false allele rates are based on replicate genotyping of 33.5–39.3% of individuals.

Table S2 Matrilineal assignments for T. antithetica larvae as inferred using COLONY 2.0.

Table S3 Matrilineal assignments for T. synthetica larvae as inferred using COLONY 2.0.

Fig. S1 Simplified neighbor-joining tree showing relationships among mtDNA sequences from larvae collected in Tikaboo Valley, adults of known species status, and selected outgroups. Taxa are shaded by species ID as determined by microsatellite genotyping. Relationships within T. synthetica and T. antithetica are omitted for simplicity.

Fig. S2 Species identification of yucca moth larvae at the Tikaboo Valley contact zone, based on Bayesian clustering (= 2) of microsatellite DNA data. Vertical lines within the bar plot indicate coancestry (black = T. synthetica, grey = T. antithetica). Horizontal lines above the bar plot show assigned taxon, collection location, life stage, and tree type (Y. brevifolia: E = eastern, W = western).

Fig. S3 Bayesian clustering for Tegeticula based on microsatellite DNA data. Fig. S3a shows the mean ln(P|D) scores for three replicate MCMC runs in structure. Fig. S3b shows the corresponding values for &Dgr;K, indicating that the uppermost level of hierarchical structure is located at = 2.

Fig. S4 ML estimates of pairwise sibship for T. antithetica and T. synthetica larvae, based on combined data from microsatellite DNA genotypes and mtDNA haplotypes (black = full-sib, grey = half-sib). Fig. S4a shows the total sample of T. antithetica larvae collected from different trees, enclosed within boxes along the diagonal (Y. brevifolia: E = eastern, W = western). Fig. S4b shows T. antithetica larval sibships within and among fruit (indicated by dashed lines and lettered labels) on trees. Fig. S4c shows the total sample of T. synthetica larvae collected from different trees, enclosed within boxes along the diagonal (Y. brevifolia: E = eastern, W = western). Fig. S4d shows T. synthetica larval sibships within and among fruit (indicated by dashed lines and lettered labels) on trees.

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