Globicephaline whales from the Mio-Pliocene Purisima Formation of central California, USA

Boessenecker, Robert W.; Perry, Frank A.; Geisler, Jonathan H.

doi:10.4202/app.2013.0019

Cited by 7 publications

(11 citation statements)

References 39 publications

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“…Described delphinid fossils besides Eodelphinus further support our model of morphospace evolution from a generalized morphology similar to Lagenorhynchus albirostris and Tursiops . As expected from a rapid radiation, they are preserved from the Pliocene (5.3–2.6 mya) onward and include globicephalines such as Protoglobicephala mexicana ( Aguirre-Fernández et al., 2009 ; Boessenecker et al., 2015 ), possible relatives of Orcinus such as Orcinus citonensis ( Bianucci, 1996 ), and delphinines such as Septidelphis morii ( Bianucci, 2013 ) and Hemisyntrachelus , which share skull shape similarities and possible transitional morphologies among their extant relatives. Protoglobicephala has a slightly longer rostrum than many of the extant globicephalines and was described as “intermediate” in morphology between Tursiops and extant globicephalines ( Aguirre-Fernández et al., 2009 ), a transitional morphology that is supported by our model.…”

Section: Discussionmentioning

confidence: 95%

Evolution and Diversification of Delphinid Skull Shapes

et al. 2020

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Summary The diversity of the dolphin family was established during a short window of time. We investigated delphinid skull shape evolution, mapping shapes on an up-to-date nuclear phylogeny. In this model, the common ancestor was similar to Lagenorhynchus albirostris . Initial diversification occurred in three directions: toward specialized raptorial feeders of small prey with longer, narrower beaks, e.g., Delphinus ; toward wider skulls with downward-oriented rostra and reduced temporal fossae, exemplified by suction feeders, e.g., Globicephala; and toward shorter and wider skulls/rostra and enlarged temporal fossae, e.g., Orcinus . Skull shape diversity was established early, the greatest later developments being adaptation of Steno to raptorial feeding on large prey and the convergence of Pseudorca toward Orcinus , related to handling large prey. Delphinid skull shapes are related to feeding mode and prey size, whereas adaptation to habitat is not marked. Over a short period, delphinid skulls have evolved a diversity eclipsing other extant odontocete clades.

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Section: Discussionmentioning

confidence: 95%

Evolution and Diversification of Delphinid Skull Shapes

et al. 2020

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“…UCMP 219034 and 219162 appear to represent additional (albeit fragmentary) records of globicephalines from the Pliocene of the eastern North Pacific along with Protoglobicephala from Baja California (Aguirre-Fernández et al 2009). Additional globicephaline fossils from the Santa Cruz section of the Purisima Formation including a partial skull (UCMP 219233) and two petrosals (UCMP 219487 and 219488) were reported by Boessenecker et al (2013). Nevertheless, globicephalines appear to be relatively rare in Late Neogene strata of the eastern North Pacific.…”

Section: Remarks and Comparisonsmentioning

confidence: 86%

“…Additionally, a new genus of toothless odobenine walrus (Barnes & Perry 1989) awaits formal publication. Several members of the diverse cetacean assemblage (Barnes 1977) have been reported, including the bizarre small-bodied mysticete Herpetocetus bramblei (Boessenecker & Geisler 2008;Whitmore & Barnes 2008) and the long-snouted lipotid dolphin Parapontoporia wilsoni Barnes, 1985, in addition to two globicephaline whales (Boessenecker et al 2013). Lastly, fossil sirenian bone fragments were reported by Domning (1978).…”

Section: Odontocetimentioning

confidence: 99%

“…In comparison, there are approximately 70 marine vertebrate taxa recorded from the Santa Cruz section of the Purisima Formation, although this number is an aggregate of three stratigraphically separated assemblages (Boessenecker & Perry, unpublished data). Although various elements of the vertebrate assemblage from the well-known Santa Cruz section of the Purisima Formation have been described, including cetaceans (Barnes 1985b;Whitmore & Barnes 2008;Boessenecker et al 2013) and pinnipeds (Repenning & Tedford 1977;Boessenecker & Perry 2011), the sharks, rays, bony fish, and birds have yet to be described. Additionally, there remain Boessenecker R. W. many more cetacean and pinniped fossils to describe from Purisima Formation localities in the Santa Cruz and Point Reyes sections, including new taxa.…”

Section: Remarks and Comparisonsmentioning

confidence: 99%

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A new marine vertebrate assemblage from the Late Neogene Purisima Formation in Central California, part II: Pinnipeds and Cetaceans

Boessenecker

2013

Geodiversitas

571

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e newly discovered Upper Miocene to Upper Pliocene San Gregorio assemblage of the Purisima Formation in Central California has yielded a diverse collection of 34 marine vertebrate taxa, including eight sharks, two bony fish, three marine birds (described in a previous study), and 21 marine mammals. Pinnipeds include the walrus Dusignathus sp., cf. D. seftoni, the fur seal Callorhinus sp., cf. C. gilmorei, and indeterminate otariid bones. Baleen whales include dwarf mysticetes (Herpetocetus bramblei Whitmore & Barnes, 2008, Herpetocetus sp.), two right whales (cf. Eubalaena sp. 1, cf. Eubalaena sp. 2), at least three balaenopterids ("Balaenoptera" cortesi "var." portisi Sacco, 1890, cf. Balaenoptera, Balaenopteridae gen. et sp. indet.) and a new species of rorqual (Balaenoptera bertae n. sp.) that exhibits a number of derived features that place it within the genus Balaenoptera. is new species of Balaenoptera is relatively small (estimated 61 cm bizygomatic width) and exhibits a comparatively narrow vertex, an obliquely (but precipitously) sloping frontal adjacent to vertex, anteriorly directed and short zygomatic processes, and squamosal creases. Fossil odontocetes include the lipotid "river dolphin" Parapontoporia sternbergi (Gregory & Kellogg, 1927), four true porpoises including a bizarre new genus also known from other strata (Phocoenidae indet., Phocoenidae unnamed genera 1 and 2, and cf. Phocoena), an indeterminate delphinid (Delphinidae indet.) a pilot whale-like delphinid (cf. Globicephalinae indet.), an undetermined sperm whale (cf. Physeteroidea indet.), and an indeterminate odontocete. e new record of Parapontoporia sternbergi is noteworthy as it represents the first association of any earbones (petrosal, tympanic bulla, malleus, and incus) for the extinct genus. Discovery and description of a complete marine mammal assemblage permits faunal comparisons with other published Pliocene marine mammal assemblages from around the globe. e aggregate Pliocene marine mammal assemblage from GEODIVERSITAS • 2013 • 35 (4) Boessenecker R. W. eastern North Pacific (ENP) shares little in common with the modern fauna, and is mostly composed of extinct genera; notably, phocoenids and odobenids were more diverse than in the ENP today. is indicates that the modern fauna of the ENP did not emerge until after the end of the Pliocene, and probably sometime during the Early Pleistocene. e Pliocene ENP assemblage is similar to that of Japan, and the North Pacific in general shares little with south Pacific, Mediterranean, or North Atlantic marine mammal assemblages, indicating the North Pacific hosted a provincial marine mammal fauna that evolved in isolation from the modern marine mammal fauna, which had already appeared in the North Atlantic by the Early Pliocene.

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“…12) ventral view. scale equals 5 cm bach, 2008), Diunatans (Bosselaers and Post, 2010), Diorocetus (Kellogg, 1969a), Thinocetus (Kellogg, 1969b), Piscolithax tedford and Piscolithax boreios (Barnes, 1984), Globicephalinae (Boessenecker et al, 2015), Australithax (Muizon, 1988a), Lomacetus (Muizon, 1988b), Pterophocaena (Murakami et al, 2012), Haborophocoena (Ichishima and Kimura, 2005), Numataphocoena (Ichishima and Kimura, 2000), Phocoena (Gutstein et al, 2014), Semirostrum (Racicot et al, 2014) and Tursiops (Mead and Fordyce, 2009). Abbreviations als = anterolateral shelf, ap = anterior process, CN VII = endocranial opening of the facial canal, cp = conical process, dpp = dorsal posterior prominence, elf = endolymphatic foramen, eo, Eustachian opening, fc = fenestra cochleae (Round Window), fv = fenestra vestibuli (Oval Window), 3) ventral view.…”

Section: Methodsmentioning

confidence: 99%

Fossil cetaceans from Duinefontein (Koeberg) an early Pliocene site on the southwestern Cape, South Africa

Govender

2019

Palaeontol Electron

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Koeberg is a Zanclean, subsurface locality on the west coast of South Africa, which was unearthed during the excavations of the Koeberg Power Station foundations. Mysticetes and odontocetes have been identified from this locality ca. 12 m below the surface. The preservational nature prevents species level identification in some instances. The balaenopterids are represented by specimens assigned to 'Balaenoptera' borealina, Diunatans sp. 1 and Fragilicetus sp. while other specimens are only identified as balaenopterids. The odontocetes have been referred to Odontoceti indet. (possibly delphinids), a beaked whale (cf. Izikoziphius) and a single phocoenid, cf. Australithax. There is undescribed odontocetes most likely physeterids. The balaenopterids and odontocetes suggest a connection of the west coast of

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Globicephaline whales from the Mio-Pliocene Purisima Formation of central California, USA

Cited by 7 publications

References 39 publications

Evolution and Diversification of Delphinid Skull Shapes

Evolution and Diversification of Delphinid Skull Shapes

A new marine vertebrate assemblage from the Late Neogene Purisima Formation in Central California, part II: Pinnipeds and Cetaceans

Fossil cetaceans from Duinefontein (Koeberg) an early Pliocene site on the southwestern Cape, South Africa

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