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Discussion
Attributed to Slater & Helgen
Taxonomy
Neomonachus was named by Scheel et al. (2014). It is extant.
It was assigned to Monachini by Berta et al. (2018); and to Monachinae by Scheel et al. (2014) and Kienle and Berta (2019).
It was assigned to Monachini by Berta et al. (2018); and to Monachinae by Scheel et al. (2014) and Kienle and Berta (2019).
Synonymy list
Year | Name and author |
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2014 | Neomonachus Scheel et al. |
2018 | Neomonachus Berta et al. p. 210 |
2019 | Neomonachus Kienle and Berta |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. Neomonachus Scheel et al. 2014 [Hawaiian monk seal]
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Neomonachus schauinslandi Hermann 1779 [Hawaiian monk seal]
Diagnosis
Reference | Diagnosis | |
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D.-M. Scheel et al. 2014 | Species of Neomonachus can be distinguished from Monachus in their smaller average body size and in lacking a white ventral patch on the pelage (in both adults and young) (Adam 2004). Species of Neomonachus possess a narrower and more gracile skull than Monachus, with relatively poorly developed sagittal and occipital crests in even the largest males (Figure 5). The rostrum is low and elongate with a conspicuous diastema between C1 and the first upper premolar (P1). In Monachus, the diastema is lacking and the anterior edge of P1 may be positioned medially to the canine (Figures 5, 6). The antorbital process of the maxilla (Figure 7) is present in Monachus but is extremely reduced or absent in Neomonachus (King 1956). The nasals are relatively narrow and posteriorly extended in Neomonachus compared to Monachus (Figure 7). The zygomatic arch is dorso-ventrally shallow and the jugal portion lacks a well-developed masseteric margin ventrally or orbital margin superiorly (the zygomatic arch is robust and both margins are well-defined in Monachus) (Figure 5). The pterygoid shows a conspicuous, laterally flared hamular process in Neomonachus (King 1956) that may be spatulate (Neomonachus schauinslandi) or hook-like (Neomonachus tropicalis); the process is absent or small and medially inflected in Monachus (Figure 8). |