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Figure S1. Neighbour-joining tree constructed with the short cytb dataset (374 bp)

Figure S2. Neighbour-joining tree constructed with the long cytb dataset (1122 bp)

Figure S3. Neighbour-joining tree constructed with the 16S rDNA dataset (469 bp)

Table S1. Cranial measurements (in mm) used in this study (voucher numbers in bold refer to specimens also used for DNA sequencing), list of skull characters and acronyms

Table S2. Table of specimens used for DNA sequencing (voucher numbers in bold refer to specimens also measured for craniometry) and data on the seven additional GenBank sequences obtained from previous studies

Table S3. Descriptive statistics of skull measurements

Table S4. Factor structure matrix (roots 1 and 2) of the discriminant function analysis (Fig. 3) performed at the species level (C. obscurus, C. platycephalus, C. ansorgei, C. alexandri and C. aff. alexandri)

Table S5. Factor structure matrix (roots 1 and 2) of the discriminant function analysis (Fig. 4) performed for five population aggregates (C. platycephalus to the west of the Niger River, C. platycephalus to the east of the Niger River, C. alexandri right bank of the Congo River, C. alexandri left bank of the Congo River and C. aff. alexandri)

Alignment S1. Aligned sequences of 16S rDNA in FASTA format (469 bp)

Alignment S2. Aligned sequences of the short cytochrome b fragment in FASTA format (374 bp)

Alignment S3. Aligned sequences of the long cytochrome b fragment in FASTA format (1122 bp)

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