Silicoflagellates Recovered from the Deep Sea, ODP Leg 199 Site 1219, East Equatorial Pacific

Pacific, Equatorial; McCartney, Kevin; Engel, R.

doi:10.2973/odp.proc.sr.199.202.2005

Cited by 2 publications

(3 citation statements)

References 42 publications

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“…spinosa; according to Barron (1985), this diatom assemblage indicates an age of 18.8 to 17.9 Ma. N. ponticula is otherwise reported from the eastern Equatorial Pacific (Engel & McCartney 1990), the eastern Equatorial Atlantic (Schellpeper & Watkins 1998), and outcrops of the temperate North Atlantic (Wetmore & Andrews 1991).…”

Section: Biostratigraphymentioning

confidence: 98%

A new odontocete (toothed cetacean) from the Early Miocene of Peru expands the morphological disparity of extinct heterodont dolphins

Lambert

Muizon

Malinverno

et al. 2017

Journal of Systematic Palaeontology

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A key step in the evolutionary history of Odontoceti (echolocating toothed cetaceans) is the transition from the ancestral heterodont conditionÂ â\u80\u93Â characterized by the presence of double-rooted cheek teeth bearing accessory denticlesÂ â\u80\u93Â to the homodont dentition displayed by most extant odontocete species. During the last few decades, new finds and the reassessment of specimens in collections revealed an increased morphological disparity amongst the Oligoâ\u80\u93Miocene heterodont odontocetes. Based on a partly articulated skeleton from late Early Miocene (Burdigalian, 18.8â\u80\u9318.0 Ma) beds of the Chilcatay Formation (Pisco Basin, Peru), we describe a new genus and species of heterodont odontocete, Inticetus vertizi, in the new family Inticetidae. This large dolphin is characterized by, amongst other things, a long and robust rostrum bearing at least 18 teeth per quadrant; the absence of procumbent anterior teeth; many large, broad-based accessory denticles in double-rooted posterior cheek teeth; a reduced ornament of dental crowns; the styliform process of the jugal being markedly robust; a large fovea epitubaria on the periotic, with a correspondingly voluminous accessory ossicle of the tympanic bulla; and a shortened tuberculum of the malleus. Phylogenetic analyses (with and without molecular constraint; with and without down-weighting of homoplastic characters) yielded contrasting results, with Inticetus falling either as a stem Odontoceti or as an early branching member of a large Platanistoidea clade. With its large size, robust rostrum and unusual dental morphology, and the absence of conspicuous tooth wear, Inticetus increases the morphological and ecological disparity of Late Oligoceneâ\u80\u93Early Miocene heterodont odontocetes. Finally, this new taxon calls for caution when attempting to identify isolated cetacean cheek teeth, even at the suborder level. http://zoobank.org/urn:lsid:zoobank.org:pub:5B306B49-EB1B-42F9-B755-B0B05B4F938

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Section: Biostratigraphymentioning

confidence: 98%

A new odontocete (toothed cetacean) from the Early Miocene of Peru expands the morphological disparity of extinct heterodont dolphins

Lambert

Muizon

Malinverno

et al. 2017

Journal of Systematic Palaeontology

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“…In the two samples from above the barren interval, silicoflagellates were sparse, with only a few specimens per slide. Dictyocha spinosa, found in Sample 207-1258A-4R-CC, is usually restricted to a narrow stratigraphic interval (see Engel and McCartney, 2005;McCartney and Wise, 1990). Dictyocha spinosa is commonly associated with D. frenguelli or D. deflandei, but these associated taxa were not found in Sample 207-1258A-4R-CC, and no attempt is made to therefore assign this sample to an existing silicoflagellate zone.…”

Section: Biostratigraphic Resultsmentioning

confidence: 99%

“…This taxon was found by Engel and McCartney (2005) to occur in a narrow interval of the Dictyocha hexacantha Zone.…”

Section: Remarksmentioning

confidence: 95%

Data report: silicoflagellates recovered from Ocean Drilling Program Leg 207 Sites 1257 and 1258

Power¹,

McCartney²

2007

Proceedings of the Ocean Drilling Program, 207 Scientific Results

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Silicoflagellates Recovered from the Deep Sea, ODP Leg 199 Site 1219, East Equatorial Pacific

Cited by 2 publications

References 42 publications

A new odontocete (toothed cetacean) from the Early Miocene of Peru expands the morphological disparity of extinct heterodont dolphins

A new odontocete (toothed cetacean) from the Early Miocene of Peru expands the morphological disparity of extinct heterodont dolphins

Data report: silicoflagellates recovered from Ocean Drilling Program Leg 207 Sites 1257 and 1258

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