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LATE CRETACEOUS OCTOBRACHIATE COLEOID LOWER JAWS FROM THE NORTH PACIFIC REGIONS
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ABSTRACT-
Eight well-preserved cephalopod jaw fossils were discovered from the Upper Cretaceous (Santonian and Campanian) deposits of Vancouver Island, Canada, and Hokkaido, Japan. They occur individually in calcareous concretions and retain their three-dimensional architecture. Seven of them consist of a widely open outer lamella and a posteriorly projected inner lamella with a pointed rostrum. Both lamellae are made of fluorapatite, which may represent diagenetically altered chitin, ...
Related newspaper, magazine, and journal articles from HighBeam Research
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Late Ordovician jawed polychaete faunas of the type Cincinnatian region, U.S.A.
Journal of Paleontology
; Abstract-Late Ordovician jawed polychaete (Annelida) faunas from the type Cincinnatian region in the tri-stale area of Indiana, Ohio, and Kentucky, North America, are discussed on the basis of an extensive and unique collection of more than 50,000 wellpreserved scolecodonts. Approximately 40 to 50
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Reversal in some fossil polychaete jaws
Journal of Paleontology
; ABSTRACT-Scolecodonts, the jaws of polychaetes, are the fossil evidence of the rich and diverse fauna that prospered in shelf seas. Among eunicid polychaetes, the largest jaws in the jaw apparatus occur in pairs. Normally these pairs are not exact mirror images of each other. Rarely, left and right
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Twice upon a time: jaw fossils point to multiple origins of the most mammalian of features.(Cover story)
Science News
; Tom Rich has an eye for finding bits of skulls in unlikely places. In January, he and his team reported finding a slight groove in a half inch-long jaw. Using a modified CT scanner, the researchers scrutinized the fossil they had unearthed in Australia a few years earlier. Reviewing the images of
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A mouth that only a dentist could love. (the flying reptile Pterodaustro's needle-like bristles are made of enamel)(Science News of the Week)
Science News
; In the world of fossils, teeth are often the most expressive part of the body. The serrated daggers of Tyrannosaurus rex recount a life spent ripping through flesh. The broad molars of an ice age mammoth describe a steady diet of plants. But no mouth speaks as clearly as the bizarre dental battery
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AN EARLY CAMBRIAN RADULA
Journal of Paleontology
; ABSTRACT- Microscopic teeth isolated from the early Cambrian Mahto Formation, Alberta, Canada, are identified as components of a molluscan radula, the oldest on record. Tooth-rows are polystichous and lack a medial rachidian tooth-column. Anterior-posterior differences in tooth-row morphology are
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Strike kinematics in death adders: convergence with vipers?(Collegiate Communications--Undergraduate)(prey capture behavior of Elapids)
Proceedings of the North Dakota Academy of Science
; Death adders (Acanthophis) are terrestrial elapids who superficially resemble vipers. They are ambush hunters with large, triangular heads, slender necks, and stout bodies (1). Elapids and vipers differ significantly in cranial musculoskeletal morphology. Differences relating to prey capture
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Genetic Analysis of Craniofacial Traits in the Medaka
Genetics
; ABSTRACT Family and twin studies suggest that a substantial genetic component underlies individual differences in craniofacial morphology. In the current study, we quantified 444 craniofacial traits in 100 individuals from two inbred medaka (Oryzias latipes) strains, HNI and Hd-rR. Relative
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Circus Bodies: Cultural Identity in Aerial Performance
Australasian Drama Studies
; Peta Tait, Circus Bodies: Cultural Identity in Aerial Performance (London and New York: Routledge, 2005) In Circus Bodies: Cultural Identity in Aerial Performance, Peta Tail positions aerial performance of the past 140 years in the context of changing cultural beliefs about bodies. She channels a
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Ontogeny in the fossil record: diversification of body plans and the evolution of "aberrant" symmetry in Paleozoic echinoderms
Paleobiology
; Abstract.- Echinoderms have long been characterized by the presence of ambulacra that exhibit pentaradiate symmetry and define five primary body axes. In reality, truly pentaradial ambulacral symmetry is a condition derived only once in the evolutionary history of echinoderms and is restricted to
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Taxonomic discussion of the scolecodont genera Nereidavus grinnell, 1877, and Protarabellites stauffer, 1933 (Annelida: Polychaeta)
Journal of Paleontology
; ABSTRACT-The scolecodont genera Nereidavus Grinnell, 1877, and Protarabellites Stauffer, 1933, have been used for several different fossil polychaete taxa over the years. Nereidavus is here considered a nomen dubium, as the holotype of the type species is lost and the original information is
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