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Reexamination of the mandibular and dental morphology of the Early Jurassic mammalia form Hadrocodium wui

100%

Luo Z.-X., Bhullar B.-A. S., Crompton A. W., Neander A. W., Rowe T. B.

Acta Palaeontologica Polonica

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2022

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tom 67

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nr 1

2

The dental evidence on the differentiation of the ctenomyine rodents [Caviomorpha, Octodontidae, Ctenomyinae]

100%

Verzi D. H.

Acta Theriologica

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1999

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tom 44

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nr 3

Primitive species in the differentiation of the subfamily Ctenomyinae are revisited, and, on molar evidence, a new interpretation of the evolutionary pattern of these earliest members of the group is proposed. The octodontid Phtoramys is rejected as possible ancestor, whereas the genus Chasichimys (including Pattersomys), previously included in the family Echimyidae, is transferred to the Octodontidae as a primitive member of the ctenomyine radiation. During the Chasicoan and Huayquerian Ages [Late Miocene), an anagenetic event represented by an increase of hypsodonty in Chasichimys, may have led to the differentiation of the primitive euhypsodont ctenomyines of the genus Xenodontomys. Coeval cladogenetic processes, occurring during the protohypsodont evolutionary stage of the group, would have resulted in the separation of the genus Palaeoctodon from the lineage Chasichimys-Xenodontomys. These ancient representatives of the subfamily would have differentiated in central Argentine pampas. The recognition of such evolutionary events and concordant evidence from other octodontoid rodents suggest temporal differences among the outcroppings of the Cerro Azul Formation in central Argentina.

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New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution

80%

Mao F., Liu C., Meng J.

Acta Palaeontologica Polonica

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2022

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tom 67

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nr 1

4

Isolated theropod teeth from the Middle Jurassic of Niger and the early dental evolution of Spinosauridae

80%

Serrano-Martínez A., Vidal D., Sciscio L., Ortega F., Knoll F.

Acta Palaeontologica Polonica

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2016

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tom 61

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nr 2

Four isolated theropod teeth from the ?Bathonian “Argiles de l’Irhazer” in Niger are described. The teeth were found in association with the holotype of the basal sauropod Spinophorosaurus nigerensis. These specimens have been assigned to two different taxa by independent analyses, such as direct comparison with teeth previously described in the literature, discriminant and morphometric analyses from metric characters, and cladistic and cluster analyses from discrete characters. The results suggest that three teeth share affinities with those of Megalosauridae and Allosauridae, belonging most likely to the former. The fourth tooth might be from a member of the stem group Spinosauridae. If so, this would be the oldest representative of this clade. This tooth shows a combination of characters that are unusual in typical spinosaurid teeth (crown moderately compressed labiolingually and curved distally with minute denticles on the carina and a deeply veined enamel surface texture without apicobasal ridges). This could shed light on the morphological transition from the plesiomorphic ziphodont dental pattern to that of Spinosauridae. This tooth would also allow a better understanding of the origin of the spinosaurids, supporting a Gondwanan origin for the group.

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The first silesaurid dinosauriform from the Late Triassic of Morocco

80%

Kammerer C. F., Nesbitt S. J., Shubin N. H.

Acta Palaeontologica Polonica

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2012

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tom 57

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nr 2

Disarticulated material from the Late Triassic Timezgadiouine Formation in the Argana Basin of Morocco represents a new taxon of silesaurid dinosauromorph, Diodorus scytobrachion gen. et sp. nov. D. scytobrachion can be distinguished from other silesaurids by the presence of anteriorly−canted teeth that decrease in size towards the anterior end of the dentary and a distinct lateral ridge running parallel to the dentary alveolar margin. In a phylogenetic analysis, D. scytobrachion is recovered as the sister−taxon to the Brazilian Sacisaurus agudoensis, nested deep within Silesauridae. This new taxon provides further evidence of a near−cosmopolitan range for basal dinosauriforms in the Late Triassic and further demonstrates the disparity of dental morphologies within Silesauridae.

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Molar morphology and occlusion of the Early Jurassic mammalia form Erythrotherium parringtoni

80%

Jager K. R. K., Gill P. G., Martin T., Corfe I. J.

Acta Palaeontologica Polonica

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2022

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tom 67

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nr 4

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Phenetitic analysis of Old World Myotis [Chiroptera: Vespertilionidae] based on dental characters

80%

Godawa S. J.

Acta Theriologica

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1998

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tom 43

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nr 1

Similarities bet-ween 42 taxa of genus Myotis were studied based on 11 dental characters. The most primitive conditions were found in subgenus Leuconoe and in most taxa of subgenus Selysius. No clear differences between subgenera Leuconoe and Selysius were found. Only Myotis altarium, M. ikonnikoui, M. mystacinus, and M. hosonoi were found to be distinct from the 13 species studied within subgenus Selysius. The subgenus Myotis was distinct from the other subgenera in having the most derived conditions.

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Comparative analysis of the characters of the first lower molar in Microtus [ Terricola ] thomasi [ Rodentia, Arvicolidae ]

80%

Brunet-Lecomte P., Nadachowski A.

Acta Zoologica Cracoviensia

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1994

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tom 37

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nr 1

9

Diet and dental morphology of two coexisting Aethomys species [Rodentia] in Mozambique. Implications for diet reconstruction in related extinct species from South Africa

80%

Denys C.

Acta Theriologica

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1994

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tom 39

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nr 4

The examination of dental morphology of coexisting modern Aethomys namaquensis Smith, 1834 and A. chrysophilus de Winton, 1896 from Mozambique, whose diet has been studied in the field, shows that the development of stephanodont crests and the multiplication of supplementary cusps on labial side of the lower molars is associated with a mainly vegetarian diet. To the most specialized dentition corresponds the most specialized diet. The application of these results to two coexisting Aethomys species from the fossil site of Langebaanweg (Pliocene, South Africa) allows to conclude that their dental differences correspond to different paieodiets. Moerover, the A. namaquensis lineage shows during Plio- Pleistocene times a shift in dental morphology corresponding to an evolution toward a more vegetarian diet. The comparative tooth anatomy seems to be a reliable method for determining diet of extinct rodents species, their close or less close relatives, when diets of extant species are precisely known.

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Carnassiform notches improve the functional efficiency of bat molar shearing crests

71%

Czaplewski N. J., Baker C. G.

Acta Palaeontologica Polonica

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2022

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tom 67

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nr 1

Ograniczanie wyników

Reexamination of the mandibular and dental morphology of the Early Jurassic mammalia form Hadrocodium wui

The dental evidence on the differentiation of the ctenomyine rodents [Caviomorpha, Octodontidae, Ctenomyinae]

New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution

Isolated theropod teeth from the Middle Jurassic of Niger and the early dental evolution of Spinosauridae

The first silesaurid dinosauriform from the Late Triassic of Morocco

Molar morphology and occlusion of the Early Jurassic mammalia form Erythrotherium parringtoni

Phenetitic analysis of Old World Myotis [Chiroptera: Vespertilionidae] based on dental characters

Comparative analysis of the characters of the first lower molar in Microtus [ Terricola ] thomasi [ Rodentia, Arvicolidae ]

Diet and dental morphology of two coexisting Aethomys species [Rodentia] in Mozambique. Implications for diet reconstruction in related extinct species from South Africa

Carnassiform notches improve the functional efficiency of bat molar shearing crests