A New Sectolophid Tapiromorph (perissodactyla, Mammalia) From The Early Eocene Of Pakistan
collision; northwest pakistan; Paleontology
Maas M C; Hussain S T; Leinders J J M; Thewissen J G M
Journal of Paleontology
2001
2001-03
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1666/0022-3360(2001)075%3C0407:anitpm%3E2.0.co;2" target="_blank" rel="noreferrer noopener">10.1666/0022-3360(2001)075%3C0407:anitpm%3E2.0.co;2</a>
Abderitid Marsupials From The Miocene Of Patagonia: An Assessment Of Form, Function, And Evolution
argentina; australia; behavior; burramyidae; dasyuridae; dental function; diet; mammals; morphology; Paleontology; pygmy-possum
Dumont E R; Strait S G; Friscia A R
Journal of Paleontology
2000
2000-11
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1666/0022-3360(2000)074%3C1161:amftmo%3E2.0.co;2" target="_blank" rel="noreferrer noopener">10.1666/0022-3360(2000)074%3C1161:amftmo%3E2.0.co;2</a>
Phalangeal Fusion In Schizotheriine Chalicotheres (mammalia, Perissodactyla)
foot; Paleontology
Coombs M C; Rothschild B M
Journal of Paleontology
1999
1999-07
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1017/s0022336000032509" target="_blank" rel="noreferrer noopener">10.1017/s0022336000032509</a>
CRANIAL ANATOMY OF MIDDLE EOCENE REMINGTONOCETUS (CETACEA, MAMMALIA) FROM KUTCH, INDIA
hearing; Paleontology; evolution; origin; whales; transition
The family Remingtonocetidae is a basal family of Eocene cetaceans only known from near shore marine environments of India and Pakistan. We describe a new skull for Remingtonocetus harudiensis which elucidates the anatomy and functional morphology of the head and provides new details on cranial cavity and nasopharyngeal region. We suggest that Remingtonocetus was an ambush predator that hunted from a perch on the ocean floor, and that hearing was its most important sense. We speculate that the greatly elongated rostrum is an adaptation for water retention because these are some of the earliest whales living in seawater.
Bajpai S; Thewissen J G M; Conley R W
Journal of Paleontology
2011
2011-07
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1666/10-128.1" target="_blank" rel="noreferrer noopener">10.1666/10-128.1</a>
NEW SKELETAL MATERIAL OF ANDREWSIPHIUS AND KUTCHICETUS, TWO EOCENE CETACEANS FROM INDIA
artiodactyls; gujarat; hearing; kachchh; locomotor evolution; mammalia; Paleontology; whales
The Eocene cetacean genera Andrewsiphius and Kutchicetus are systematically revised, their anatomy described, and their phylogenetic position analyzed. Each genus contains a single species, A. sloani and K. minimus, and both are known only from the middle Eocene of the Indian Subcontinent. Andrewsiphius and Kutchicetus differ in a number of respects, the most important dental difference being that P2, P3, p2, and p3 are double-rooted in Andrewsiphius and single-rooted in Kutchicetus. Lower molars are separated by diastemata in Kutchicetus, but not in Andrewsiphius. Postcranially, Andrewsiphius has caudal vertebrae that are far more robust than those of Kutchicetus. We propose the new clade Andrewsiphiinae for these two genera, based on their unique characters: the extremely slender jaw, fused mandibular symphysis, narrow palate and rostrum, and lower molars that have a low crown with three Cusps lined tip rostro-caudally. A phylogenetic analysis indicates that andrewsiphiines are either a subfamily of Remingtonocetidae or an independent branch on the Eocene cetacean lineage. Interpreting conservatively, we classify them as remingtonocetids. Andrewsiphiines have a long, robust, dorso-ventrally flattened tail and short limbs, Suggesting that they swam using dorsoventral undulation of the tail.
Thewissen J G M; Bajpai S
Journal of Paleontology
2009
2009-09
Journal Article
<a href="http://doi.org/10.1666/08-045.1" target="_blank" rel="noreferrer noopener">10.1666/08-045.1</a>
Dental morphology of Remingtonocetidae (Cetacea, Mammalia)
eocene; Paleontology; whale
Thewissen J G M; Bajpai S
Journal of Paleontology
2001
2001-03
Journal Article
<a href="http://doi.org/10.1666/0022-3360(2001)075%3C0463:dmorcm%3E2.0.co;2" target="_blank" rel="noreferrer noopener">10.1666/0022-3360(2001)075%3C0463:dmorcm%3E2.0.co;2</a>
A new near-shore marine fauna and flora from the early neogene of northwestern Venezuela
america; extinction; Paleontology; veneridae
A diverse near-shore marine fauna existed during the early Miocene in what is today an arid inland region about 90 km south of the Caribbean coast of northern Venezuela, a poorly known area geologically and paleontologically. The fossil locality consists of more than 100 m of section exposed in an area of about 1 km(2). We report the discovery of 20 molluscan species, one crab (Portunus oblongus), at least three shades (Hemipristis serra and Carcharhinus spp.), one turtle ("Podocnemis" venezuelensis), one crocodile (Crocodylidae), two whales (Odontoceti) and a three dimensional cast of the mesocarp or endocarp of a palm fruit. Several taxa are reported for the first time in Venezuela or in northern South America. The fauna indicates, or at least is consistent with, an early Miocene age for the locality, and a near-shore and shallow water marine depositional environment. We suggest that the earliest mammal previously reported from Venezuela, the pyrothere Proticia venezuelensis, was collected in Miocene rocks of the Castillo Formation instead of Eocene rocks of the Trujillo Formation.
Sanchez-Villagra M R; Burnham R J; Campbell D C; Feldmann R M; Gaffney E S; Kay R F; Lozsan R; Purdy R; Thewissen J G M
Journal of Paleontology
2000
2000-09
Journal Article
<a href="http://doi.org/10.1666/0022-3360(2000)074%3C0957:annsmf%3E2.0.co;2" target="_blank" rel="noreferrer noopener">10.1666/0022-3360(2000)074%3C0957:annsmf%3E2.0.co;2</a>