Neomonachus

Notice:

This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions. If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale): Scheel D, Slater G, Kolokotronis S, Potter C, Rotstein D, Tsangaras K, Greenwood A, Helgen K (2014) Biogeography and taxonomy of extinct and endangered monk seals illuminated by ancient DNA and skull morphology. ZooKeys 409 : 1–33, doi. Versioned wiki page: 2014-05-14, version 51972, https://species-id.net/w/index.php?title=Neomonachus&oldid=51972 , contributors (alphabetical order): Pensoft Publishers. Citation formats to copy and paste BibTeX: @article{Scheel2014ZooKeys409, author = {Scheel, Dirk-Martin, Slater, Graham J., Kolokotronis, Sergios-Orestis, Potter, Charles W., Rotstein, David S., Tsangaras, Kyriakos, Greenwood, Alex D. AND Helgen, Kristofer M.}, journal = {ZooKeys}, publisher = {Pensoft Publishers}, title = {Biogeography and taxonomy of extinct and endangered monk seals illuminated by ancient DNA and skull morphology}, year = {2014}, volume = {409}, issue = {}, pages = {1--33}, doi = {10.3897/zookeys.409.6244}, url = {http://www.pensoft.net/journals/zookeys/article/6244/abstract}, note = {Versioned wiki page: 2014-05-14, version 51972, https://species-id.net/w/index.php?title=Neomonachus&oldid=51972 , contributors (alphabetical order): Pensoft Publishers.} } RIS/ Endnote: TY - JOUR T1 - Biogeography and taxonomy of extinct and endangered monk seals illuminated by ancient DNA and skull morphology A1 - Scheel D, Slater G, Kolokotronis S, Potter C, Rotstein D, Tsangaras K, Greenwood A A1 - Helgen K Y1 - 2014 JF - ZooKeys JA - VL - 409 IS - UR - http://dx.doi.org/10.3897/zookeys.409.6244 SP - 1 EP - 33 PB - Pensoft Publishers M1 - Versioned wiki page: 2014-05-14, version 51972, https://species-id.net/w/index.php?title=Neomonachus&oldid=51972 , contributors (alphabetical order): Pensoft Publishers. M3 - doi:10.3897/zookeys.409.6244 Wikipedia/ Citizendium: <ref name="Scheel2014ZooKeys409">{{Citation | author = Scheel D, Slater G, Kolokotronis S, Potter C, Rotstein D, Tsangaras K, Greenwood A, Helgen K | title = Biogeography and taxonomy of extinct and endangered monk seals illuminated by ancient DNA and skull morphology | journal = ZooKeys | year = 2014 | volume = 409 | issue = | pages = 1--33 | pmid = | publisher = Pensoft Publishers | doi = 10.3897/zookeys.409.6244 | url = http://www.pensoft.net/journals/zookeys/article/6244/abstract | pmc = | accessdate = 2024-12-18 }} Versioned wiki page: 2014-05-14, version 51972, https://species-id.net/w/index.php?title=Neomonachus&oldid=51972 , contributors (alphabetical order): Pensoft Publishers.</ref> See also the citation download page at the journal.

Taxonavigation

Ordo: Carnivora
Familia: Phocidae

Name

Neomonachus Slater & Helgen gen. n. – Wikispecies link – ZooBank link – Pensoft Profile

Type species

Monachus schauinslandi Matschie, 1905 (endemic to the Hawaiian Islands).

Other included species

A second species, Monachus tropicalis (Gray, 1850) (endemic to the Caribbean region, recently extinct). We note here, as an aside, that an earlier specific epithet, antillarum Gray, 1849, has often been included in the synonymy of tropicalis, where it is identified either as a partial synonym (e.g., Allen 1880: 708, 1887: 3, Adam 2004: 1) or a nomen nudum (Wozencraft 2005: 598), or simply listed as a synonym without comment (Wozencraft 1993: 331, Berta and Churchill 2012: 219). However, Gray (1849) in fact used this name to describe Cystophora antillarum, based on a juvenile male specimen of a Hooded seal, supposedly from Jamaica (Allen 1880, Gill 1866), and the name is not a nomen nudum. It is clear that the skin of the Caribbean monk seal that Gray later used to describe Phoca tropicalis (Gray 1850), also from Jamaica, was not part of his hypodigm of antillarum, to which he explicitly attributed a single Cystophora skin and skull (Gray 1849, 1850; Allen 1887:postscript). Thus the name antillarum does not correctly belong in the synonymy of Neomonachus tropicalis (it is neither a partial synonym nor a nomen nudum). It is instead simply a junior synonym for the Hooded seal, Cystophora cristata (which occasionally occurs as a Caribbean vagrant: Mignucci-Giannoni and Odell 2001, Ward et al. 2013). The only additional name that correctly belongs in the technical synonymy of tropicalis is the junior synonym [Phoca] wilkianus (Gosse 1851), described from the Pedro Keys, south coast of Jamaica, soon after Gray’s (1850) description of tropicalis (see Allen 1880).

Etymology

The new generic name combines the Greek Neo- (new), with Monachus, the genus name previously used for all monk seals. The name references both the recognition of a new genus within the monk seals and its New World (Western Hemisphere) distribution.

Morphological diagnosis

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). In ventral view, the morphology of the petromastoid (petrosal-mastoid) complex in relation to the auditory bulla in Neomonachus is diagnostic in comparison to Monachus. King (1966) noted that having the petrosal visible within the posterior lacerate foramen was a feature that united Monachus and the phocines, although Ray (1976b) pointed out that it is difficult to distinguish the boundaries of the petrosal and mastoid (petromastoid complex) in the posterior lacerate foramen and that this character was far more variable within lobodontines than King had estimated. He argued that a better standard for delineating this character state uniting Mirounga and the lobodontines is a bulla in near contact or complete contact with the exoccipital. We agree with Ray’s assessment, but we note that the configuration of the petromastoid complex and bulla with respect to the posterior lacerate foramen is more complex within “Monachus” (i.e. sensu lato) than has been previously described. In particular, the petromastoid of Monachus monachus is clearly ventrally inflated, such that it protrudes below the rim of the posterior lacerate foramen, forming its entire lateral border (Figure 9a). Furthermore, the ventral expansion of the petromastoid almost completely excludes the flat posterior edge of the bulla from the anterior margin of the posterior lacerate foramen. This morphology, which is also present in the fossil taxon Pliophoca, has been proposed as synapormorphic for Monachini (Amson and de Muizon 2013). However, in Neomonachus, the tapering posterior margin of the bulla lies completely ventral to the petromastoid, the posterior border of which is visible within the neurocranium through the posterior lacerate foramen (Figure 9: b and c). Ray also noted that the posterior carotid foramen opens in full view in Monachus (sensu lato) but is partially concealed on the medial bulla wall in phocines (Ray 1976b). Our observations show that, for Neomonachus, the posterior carotid canal opens directly posteriorly, with a flattened dorsal roof formed by excavation of the caudal entotympanic (Figure 9). In Monachus, the canal opens postero-ventrally due to a more complete, ring-like opening. These character-state differences are clearly developed even in juvenile individuals, indicating that they are not the outcome of ontogenetic variation. The upper incisor arcade of Neomonachus is sublinear, while that of Monachus appears slightly parabolic due to a more posteriorly set I3 (King 1956; Figure 6). The upper post-canine toothrow of Neomonachus is arranged more linearly than in Monachus, where the teeth are obliquely oriented. In specimens of Neomonachus with unworn dentitions, both upper and lower premolars and first molar possess low, blunt central cusps and two posterior accessory cusps, as compared with a high, pointed central cusp and a single posterior accessory cusp for Monachus. In both Neomonachus and Monachus, p3 is the largest of the lower teeth. However, in Monachus, lower post-canine tooth size decreases in the order p3, p2, p4, m1, p1, while the lower teeth of Neomonachus decrease in the order p3, p4, p2, m1, p1; and p4 may be larger than p3 in some individuals (Figure 10). The mandible of Neomonachus is long and slender compared with that of Monachus, and the coronoid process is lower and less broad antero-posteriorly (King 1956; Figure 11). The mandibular foramen is anteriorly displaced and lies at the termination of a shallow, antero-ventrally oriented sulcus that begins below the level of the mandibular notch. In Monachus, the foramen opens directly at this level. The insertion of the pterygoid muscles is relatively undefined in Neomonachus as compared to the markedly expanded area evident in Monachus (Figure 11).

Original Description

• Scheel, D; Slater, G; Kolokotronis, S; Potter, C; Rotstein, D; Tsangaras, K; Greenwood, A; Helgen, K; 2014: Biogeography and taxonomy of extinct and endangered monk seals illuminated by ancient DNA and skull morphology ZooKeys, 409: 1-33. doi

Images

Figure 5. Lateral views of crania of a Monachus monachus b Neomonachus schauinslandi, and c Neomonachus tropicalis. Arrows indicate the more developed occipital crest and zygomatic arches, and deeper snout of Monachus compared to Neomonachus species.  Figure 6. Ventral views of palates of a Monachus monachus b Neomonachus schauinslandi, and c Neomonachus tropicalis. The tooth row of Monachus is more crowded, likely as a result of the shorter rostrum, and this results in a more obliquely oriented set of post-canine teeth and the lack of a diastema between the upper canine and the first premolar. In Neomonachus, there is a distinct diastema between C1 and P1, and the post-canine teeth are arranged more linearly. The upper incisor arcade of Monachus is slightly parabolic due to the posterior placement of the lateral incisors, and the anterior premaxilla appears slightly curved. In Neomonachus, the incisor arcade is linear and the anterior premaxilla is straight.  Figure 7. Dorsal view of rostra of a Monachus monachus b Neomonachus schauinslandi, and c Neomonachus tropicalis. Monachus exhibits a well-developed antorbital process on the maxilla, immediately inferior to the fronto-maxillary suture. The process is reduced or absent in Neomonachus. The nasals of Monachus are short and triangular, tapering smoothly posteriorly to produce a point at their union. The nasals of Neomonachus are longer and do not taper smoothly.  Figure 8. Ventral views of crania of a Monachus monachus b Neomonachus schauinslandi, and c Neomonachus tropicalis, showing the pterygoid region. Neomonachus exhibits a well-developed, laterally flared pterygoid hamulus that is visible in dorsal view. The hamulus may be spatulate (Neomonachus schauinslandi) or hook-like (Neomonachus tropicalis). The hamular process is absent or medially flared in Monachus, and is not visible in dorsal view.  Figure 9. Posteroventral view of the basicranium and left bulla in a Monachus monachus b Neomonachus schauinslandi, and c Neomonachus tropicalis. The bulla of Monachus is bordered posteriorly by a ventrally expanded posterior portion of the petro-mastoid complex. The petrosal abuts the bulla’s posterior wall and in ventral view forms the entire lateral and anterolateral border of the posterior lacerate foramen. In Neomonachus, the posterior part of the petrosal is visible in the posterior lacerate foramen but remains superior to the bulla. In ventral view, this gives the impression that the anterior border of the posterior lacerate foramen is formed entirely by the bulla. The posterior carotid canal opens posteroventrally in Monachus. This apparently results from a relatively complete “ring-like” opening, formed by the bulla. This form of opening is apparent in subadult and juvenile Monachus, suggesting that it is not dependent on ontogenetic development or the robusticity of the Monachus cranium relative to Neomonachus. In contrast, the posterior carotid canal of Neomonachus opens directly posteriorly, the opening being an incomplete ring and the dorsal border formed by a flattening of the bulla, perhaps resulting from the bulla’s extension over the petrosal.  Figure 10. Plots of mean upper (a) and lower (b) relative post-canine tooth size. Relative tooth size is computed by dividing the mesio-distal length of each tooth by the length of the 3rd premolar (which is typically largest) in the same row.  Figure 11. Medial view of right dentaries of a Monachus monachus b Neomonachus schauinslandi, and c Neomonachus tropicalis. The mandibular foramen is situated inferior to the mandibular notch in Monachus, and opens immediately to the medial surface of the ramus. In Neomonachus, the foramen is anteriorly displaced and is set in a groove or sulcus that extends from inferior to the mandibular notch. Also note the expanded rugose area for insertion of the pterygoid muscles in Monachus. This region is poorly developed in Neomonachus.