Results 91 to 100 of about 1,690 (206)

Der rest eines actinolepididen placodermen (Pisces) aus der bohrung bolland (emsium, Belgien) [PDF]

open access: yes, 1976
A small arctolepidid arthrodire of the subfamily Actinolepidinae is described f r om the Lower Emsium of the drilling Bolland near Liege/Belgium. The new genus resembles most A ctinolepis but differs from that genus and other Actinolepidinae in the shape
Schmidt, W.
core  

The effects of lecture speed and note‐taking on memory for educational material

open access: yesApplied Cognitive Psychology, Volume 38, Issue 1, January/February 2024.
Abstract The use of pre‐recorded lecture videos as a primary mode of instruction during online learning has allowed students flexibility in how they self‐regulate their learning. Although increasing lectures up to 2x speed has little cost on memory, it is unknown whether note‐taking at increased speeds interacts with memory.
Ashley Chen   +4 more
wiley   +1 more source

Hyperossification in the vertebral column of Devonian placoderm fishes (Arthrodira)

open access: yesJournal of Vertebrate Paleontology, 2020
Skeletal bone enlargement (hyperossification) was thought to only occur in endochondral and dermal bones (e.g., endoskeletons of marine tetrapods and dermal bones of certain jawless vertebrates, placoderms, and teleost fishes). However, in some arthrodiran placoderms (basal jawed vertebrates), i.e., Millerosteus minor, Compagopiscis croucheri ...
van Mesdag, S.   +3 more
openaire   +2 more sources

Première découverte d'un Arthrodire (Placodermi, Vertebrata) dans le Dévonien d'Amérique du Sud [PDF]

open access: yes, 1996
Des plaques dermiques d'un grand Arthrodire eubrachyhtoracide (Placodermi, Vertebrata), provisoirement attribuées à un Dunkleosteidae, ont été découvertes dans les faciès détritique de la Formation de Colpacucho (Famennien), sur la Péninsule de Cumana ...
Diaz Martinez, Enrique   +3 more
core  

Evolutionary origin of teeth [PDF]

open access: yes, 2019
Teeth and jaws have been widely perceived as key innovations underpinning the adaptive radiation and the evolutionary success of jawed vertebrates. However, the origin, evolution, and developmental evolution of teeth are all the subject of controversy ...
Donoghue, Philip, Rucklin, Martin
core   +2 more sources

Tooth structure in Rhizodus hibberti Ag., a rhipidistian fish [PDF]

open access: yes, 1968
Main articleThe structure of the large laniary teeth of the Lower Carboniferous rhipidistian fish Rhizodu hibberti Ag. is interpreted in terms of a new theory of tooth development.
Cruickshank, A. R.
core  

New morphological information on, and species of placoderm fish Africanaspis (Arthrodira, Placodermi) from the Late Devonian of South Africa.

open access: yesPLoS ONE, 2017
Here we present a new species of placoderm fish, Africanaspis edmountaini sp. nov., and redescribe Africanaspis doryssa on the basis of new material collected from the type locality of Africanaspis.
Robert W Gess, Kate M Trinajstic
doaj   +1 more source

Geology of the Moscow Quarry, Northwest Muscatine County, Iowa: Field Guidebook, October 22, 2011 [PDF]

open access: yes, 2011
This is a guidebook for field conference of a culmination of a long series of cooperative investigations in Iowa. With the staff of the Iowa Geological Survey and many other departments and survey services in accompanying states to produce this guidebook.

core  

Ornamentation of dermal bones of Placodermi from the Lower Devonian of Morocco as a measure of biodiversity [PDF]

open access: yes, 2017
Dermal bones are formed early during growth and thus constitute an important tool in studies of ontogenetic and evolutionary changes amongst early vertebrates.
Antczak, Mateusz, Berkowski, Błażej
core   +1 more source

Bioerosion in the Late Devonian placoderm remains from the Holy Cross Mountains, Poland

open access: yesActa Palaeontologica Polonica
We report the first occurrence of trace fossils in placoderm bones from the Upper Devonian of the Holy Cross Mountains. A taxonomic analysis of three ichnogenera revealed the earliest evidence of Sulculites (ie., Sulculites bellus), characterised by ...
Patrycja G. Dworczak   +2 more
doaj   +1 more source

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