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6 results for “sirenians”
Fig. 3 in A new Miocene sirenian from Kutch, India
Fig. 3. Right lateral (A), oblique anterior (B), and occlusal (C) view of mandible of the sirenian Domningia sodhae gen. et sp. nov. (IITR−SB 3091, holotype), Khari Nadi Formation Aquitanian (lower Miocene), Nangia, District Kutch, India.
Fig. 2 in A new Miocene sirenian from Kutch, India
Fig. 2. Nasal opening and superior left orbit (A) and oblique occipital view (B) of the sirenian Domningia sodhae gen. et sp. nov. (IITR−SB 3091), Khari Nadi Formation, Aquitanian (lower Miocene), Nangia, District Kutch, India.
FIG. 2 in Variation in bone histology of middle Eocene sirenians from western Europe
FIG. 2. — Histological characteristics of the ribs: A-D, specimen AR1-33 from Ardanatz (Navarre); A, general view of the medullar region at mid-diaphysis. The medulla is entirely compact and includes deposits of endosteal bone tissue (light areas), with remnants of calcified cartilage matrix interspersed between them (dark areas); B, endosteal deposits, globuli ossei and remnants of calcified cartilage matrix (*) in the diaphyseal medulla; C, deep region of the periosteal cortex at mid-diaphysis. The cortex is composed of variably oriented primary osteons (light areas), surrounded by "woven-fibered" periosteal tissue (dark areas). The asterisk indicates one annulus; D, peripheral region of the cortex. The asterisks point to several conspicuous cyclic growth marks, represented here by lines of arrested growth. Haversian remodelling is feeble; E, medullar remodelling at mid-diaphysis in the rib of specimen UZ1-30 from Uztarrotz (Navarre). The spatial density of the secondary osteons produced by Haversian remodelling is clearly more elevated than in specimen AR1. Polarized light; F, Remodelled medullar spongiosa in the proximal extremity of the rib of specimen UZ1-29 from Uztarrotz. The osseous trabeculae are extensively remodelled, and the residues of calcified cartilage are sparse, as compared to specimen AR1. Polarized light. Scale bars: A, C-F, 950 µm; B, 400 µm.
FIG. 1 in Variation in bone histology of middle Eocene sirenians from western Europe
FIG. 1. — Reconstruction of a sirenian rib from the middle Eocene of Uztarrotz (Navarre, western Pyrenees), based on specimens UZ1-21, 22 and 31, showing the outlines in cross section where the histological sections were made. Scale bar: 25 mm.
Data from: Evidence for two sympatric sirenian species (Mammalia, Tethytheria) in the early Oligocene of Central Europe
The early Oligocene (Rupelian) sirenian Halitherium schinzii Kaup, 1838, which represents the type species of the genus Halitherium Kaup, 1838, is revised herein based on a morphological re-evaluation of skeletal material originally assigned to this taxon. This study provides new and comprehensive information on the cranial and postcranial anatomy and allows the distinction of two sympatric species. Following a recent approach on the invalidity and subsequent rejection of H. schinzii Kaup, 1838, Kaupitherium gruelli new genus new species is established on the basis of a nearly complete holotype. The second taxon resembles K. gruelli n. sp. in a number of skeletal features, such as reduced nasals and absence of the canines, but can be clearly distinguished mainly by the post-canine dental formula and the supraoccipital morphology. The diagnostic skullcap of a species formerly synonymized under "H. schinzii" is re-validated as the holotype of K. bronni (Krauss, 1858). On the basis of paleoecological implications, a hypothesis is established to explain the overlapping stratigraphic and biogeographic occurrences (i.e., sympatry of both taxa). A diagnosis and up-to-date synonymy complement the taxonomical information. The revision of "H. schinzii" provides new data on the past sirenian diversity and forms the basis for a taxonomic and systematic re-evaluation of species originally grouped in the genus "Halitherium."
Data from: Evidence for two sympatric sirenian species (Mammalia, Tethytheria) in the early Oligocene of Central Europe
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