New material of the marsupial (Mammalia, Metatheria)<i>Herpetotherium merriami</i>(Stock and Furlong, ) from the John Day Formation, late Oligocene, Oregon, USA

Korth, William W.; Cavin, Jennifer

doi:10.1017/jpa.2016.117

Cited by 4 publications

(6 citation statements)

References 14 publications

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“…Remarks.-In size, the molars of NDGS 4349 are within the range of specimens of H. fugax from Fitterer Ranch (Table 1) and other localities (summarized in Korth, 2015, table 2). However, it is also within the range of the usually later-occurring H. merriami (Korth and Cavin, 2016, (Korth and Cavin, 2016). The specimen cannot be definitely referred to H. merriami because it lacks the accessory stylar cusp on M2, and the cusp on M3 is distinctively smaller than in the typotypic H. merriami specimens (Korth and Cavin, 2016, fig.…”

Section: Systematic Paleontologymentioning

confidence: 87%

“…Cusp D is the largest and is anteroposteriorly elongated with a smaller cusp C fused to its anterior slope. Midway between cusp D and the posterobuccal corner of the tooth is a minute accessory cusp (cusp E+ of Korth and Cavin, 2016). Measurements.-M2: length = 1.88 mm, width = 1.94 mm; M3: length = 1.93 mm, width = 2.12 mm.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…The most distinctive morphology of the upper molars of NDGS 4349 is the relatively large stylar cusps B, C, and D on both M2 and M3, as well as the distinctive stylar cusp E+, on the M3, previously only known on specimens of H . merriami and considered diagnostic for that species (Korth and Cavin, 2016). The specimen cannot be definitely referred to H .…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…merriami because it lacks the accessory stylar cusp on M2, and the cusp on M3 is distinctively smaller than in the typotypic H . merriami specimens (Korth and Cavin, 2016, fig. 4).…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…However, it is also within the range of the usually later-occurring H . merriami (Korth and Cavin, 2016, table 2; Korth, 2018, supplementary table 10). The most distinctive morphology of the upper molars of NDGS 4349 is the relatively large stylar cusps B, C, and D on both M2 and M3, as well as the distinctive stylar cusp E+, on the M3, previously only known on specimens of H .…”

Section: Systematic Paleontologymentioning

confidence: 99%

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Marsupials (Mammalia, Metatheria) from the Brule Formation (Whitneyan, Oligocene) North Dakota

2020

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Abstract Five marsupial species are recognized from the Brule Formation at two localities in southwestern North Dakota: Fitterer Ranch and Obritsch Ranch (middle Oligocene; Whitneyan North American Land Mammal Age [NALMA]). The herpetotheriids Herpetotherium fugax Cope, 1873a, Copedelphys superstes new species, and the peradectid Nanodelphys hunti (Cope, 1873b) are represented at both localities. A fourth species is H. sp., cf. H. merriami (Stock and Furlong, 1922), represented by a single specimen from Fitterer Ranch, being limited elsewhere to the later Arikareean NALMA. A fifth species is represented by two isolated lower cheek teeth, interpreted as m1s, from Fitterer Ranch that are unique in lacking a trigonid (only two cusps present) while having a well-developed talonid. These specimens are referred to an indeterminate herpetotheriine species. The new species of Copedelphys is distinct from other species of the genus in that the anterior two lower molars are enlarged relative to the posterior molars. Overall, this new species is more similar in proportions to the latest Eocene (Chadronian) C. titanelix (Matthew, 1903) than the Oligocene (Orellan and Whitneyan) C. stevensoni (Cope, 1873b). This study adds a third and fourth Whitneyan marsupial fauna from the Great Plains region of North America, increases the known diversity of Whitneyan marsupials, and provides further evidence that marsupial diversity during the late Paleogene in North America was relatively stable until the late early Arikareean NALMA. UUID: http://zoobank.org/b8534802-b9ed-4120-baca-fc72917f7d6a

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Section: Systematic Paleontologymentioning

confidence: 87%

Section: Systematic Paleontologymentioning

confidence: 99%

Section: Systematic Paleontologymentioning

confidence: 99%

“…merriami because it lacks the accessory stylar cusp on M2, and the cusp on M3 is distinctively smaller than in the typotypic H . merriami specimens (Korth and Cavin, 2016, fig. 4).…”

Section: Systematic Paleontologymentioning

confidence: 99%

Section: Systematic Paleontologymentioning

confidence: 99%

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Marsupials (Mammalia, Metatheria) from the Brule Formation (Whitneyan, Oligocene) North Dakota

2020

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Review of the marsupials (Mammalia: Metatheria) from the late Paleogene (Chadronian–Arikareean: late Eocene–late Oligocene) of North America

Korth

2018

PalZ

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Microtomography of an enigmatic fossil egg clutch from the Oligocene John Day Formation, Oregon, USA, reveals an exquisitely preserved 29-million-year-old fossil grasshopper ootheca

Lee,

Famoso,

Lin

2024

Parks Stewardship Forum

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Eggs are one of the least understood life stages of insects, and are poorly represented in the fossil record. Using micro tomography, we studied an enigmatic fossil egg clutch of a presumed entomological affinity from the Oligocene Turtle Cove Member, John Day Formation, from the National Park Serviceadministered lands of John Day Fossil Beds National Monument, Oregon. A highly organized egg mass comprising a large clutch size of approximately 50 slightly curved ellipsoidal eggs arranged radially in several planes is preserved, enclosed in a discshaped layer of cemented and compacted soil particles. Based on the morphology of the overall structure and the eggs, we conclude that the specimen represents a fossilized underground ootheca of the grasshoppers and locusts (Orthoptera: Caelifera), also known as an egg pod. This likely represents the oldest and the first unambiguous fossil evidence of a grasshopper egg pod. We describe Subterroothecichnus radialis igen. et isp. nov. and Curvellipsoentomoolithus laddi oogen. et oosp. nov., representing the egg pod and the eggs, respectively. We advocate for adopting ootaxonomy in studying fossil eggs of entomological affinities, as widely practiced with fossil amniotic eggs. An additional 26 individual and clustered C. laddi collected throughout the A-H subunits of the Turtle Cove Member suggest the stable presence of grasshoppers in the Turtle Cove fauna, and we discuss the paleoecological implications. Oothecae have convergently evolved several times in several insect groups; this ovipositional strategy likely contributed to the fossilization of this lesserknown ontogenetic stage, enriching our understanding of past insect life.

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New material of the marsupial (Mammalia, Metatheria)Herpetotherium merriami(Stock and Furlong, ) from the John Day Formation, late Oligocene, Oregon, USA

Cited by 4 publications

References 14 publications

Marsupials (Mammalia, Metatheria) from the Brule Formation (Whitneyan, Oligocene) North Dakota

Marsupials (Mammalia, Metatheria) from the Brule Formation (Whitneyan, Oligocene) North Dakota

Review of the marsupials (Mammalia: Metatheria) from the late Paleogene (Chadronian–Arikareean: late Eocene–late Oligocene) of North America

Microtomography of an enigmatic fossil egg clutch from the Oligocene John Day Formation, Oregon, USA, reveals an exquisitely preserved 29-million-year-old fossil grasshopper ootheca

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