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mms12113-sup-0001-Supplementaryfigures.docxWord document25700K

Analytical Methods

Figure S1. External appearance of M. hotaula holotype adult female (3WZS). Clockwise from top; right ventro-lateral view of anterior half (length of section, 205.7 cm); dorsal view of flukes with caudal notch; dorsal view of head; left side of head. Reproduced from Deraniyagala (1965), Plate I.

Figure S2. External appearance, artist's impression of M. hotaula holotype (3WZS). Reproduced from Deraniyagala (1965), fig. 2.

Figure S3. Skulls of M. hotaula paratypes. (A) USNM593418, adult female, Palmyra Atoll: (i) dorsal view, (ii) lateral view, (iii) ventral view, (iv) mandibles with teeth in situ. Scale, pen 138 mm (i–iii), US nickel, 21 mm (iv). Photo credit: M. L. Dalebout. (B) USNM593414, subadult female?, Palmyra Atoll: (i) dorsal view (scale, US nickel, 21 mm), (ii) lateral view (scale, 138 mm pen). Scale, pen 138 mm (i), US nickel, 21 mm (ii). Photo credit: M. L. Dalebout. (C) USNM593426, adult male, Palmyra Atoll: (i) dorsal view of skull and mandibles, teeth removed, (ii) lateral view of skull and mandibles, teeth removed, (iii) mandibles with teeth in situ. Photo credit: A. Hoke. (D) MM-0001, adult male, Seychelles: (i) dorsal view of skull and mandibles with teeth in situ, (ii) lateral view of skull and mandibles with teeth in situ, (iii) ventral view of skull, (iv) lateral view of mandibles with teeth in situ. Photo credit: L. Thompson.

Figure S4. Other M. ginkgodens skulls. (A) MginNZ04, adult male, New Zealand: (i) dorsal view, (ii) lateral view, (iii) mandibles with teeth in situ lateral view, (iv) mandibles with teeth in situ ventral view. Courtesy of A. van Helden and the Museum of New Zealand Te Papa Tongarewa. (B) MginUSNM298237, adult female, California: (i) dorsal view of skull (scale, 300 mm ruler), (ii) dorsal view of mandibles with right tooth in situ (scale, US nickel, 21 mm). Photocredit: M. L. Dalebout.

Figure S5. Additional images, external appearance of M. hotaula, MM-0001, adult male, Seychelles. (A) Ventral view of stranded animal, (B) postero-lateral view, (C) antero-dorsal view of head. Photo credit: L. Thompson.

Figure S6. Additional images, external appearance of M. ginkgodens, MginNZ03, adult male, New Zealand. (A) Lateral view of head, (B) anterior view of head. Photocredit: B. Williams, courtesy of New Zealand Department of Conservation.

mms12113-sup-0002-TableS1-S5.docxWord document153K

Table S1. MtDNA data. (A) Control region (CR), variable sites over 658 bp. (B) Cytochrome b (CYB), variable sites over 384 bp. (C) Cytochrome oxidase I (COXI), variable sites over 987 bp. Gray shading highlights the nucleotide substitutions differentiating M. hotaula from M. ginkgodens.

Table S2. Pairwise net divergence between species, Kimura 2-parameter distances, as percentages, below diagonal. SE, above diagonal. Values for sister-species pairs highlighted in gray with bold type. (A) Control region, CR (435 bp); (B) cytochrome b, CYB (384 bp); (C) cytochrome oxidase I, COXI (958 bp). See footnotes of Table S2A for translation of species codes.

Table S3. Y-chromosome intron, DBY7. Variable sites over 241 bp. The diagnostic nucleotide substitutions that distinguish M. ginkgodens and M. hotaula from each another, and from the other Mesoplodon species sampled are highlighted in gray.

Table S4A. Cranial measurements for Mesoplodon hotaula. Measurements (in mm) are taken on the right hand side (R) where possible, following Moore (1963). Where two measurements are given, R, then L. E, estimated length. See Table S3B for definitions of measurements.

Table S4B. Definitions of cranial measurements. Numbers in parentheses refer to Moore (1963).

Table S5A. Mandibular measurements for Mesoplodon hotaula. Measurements (in mm) are taken on the right hand side (R) where possible, following Moore (1963). Where two measurements are given, R, then L. E, estimated length. See Table S4B for definitions of measurements.

Table S5B. Definitions of mandibular measurements. Numbers in parentheses refer to Moore (1963).

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