Results 191 to 200 of about 19,080 (352)

Extraordinary diversity of visual opsin genes in dragonflies

open access: yesProceedings of the National Academy of Sciences of the United States of America, 2015
Ryo Futahashi   +6 more
semanticscholar   +1 more source

Almost billfish: convergent longirostry, micro‐dentition, and possible glandular sinuses in a large teleost fish from the Upper Cretaceous of Northern Italy

open access: yesJournal of Anatomy, EarlyView.
A fossil rostrum fragment of a large teleost fish from the Upper Cretaceous of Northern Italy reveals remarkable anatomical convergences with Cenozoic and Recent billfishes (marlins, swordfishes, and akin). The extinct group Plethodidae independently acquired a long snout, micro‐teeth, and oil‐gland sinuses well before the evolution of true billfishes.
Giovanni Serafini   +5 more
wiley   +1 more source

Two new dragonflies of Oklahoma [PDF]

open access: green, 1935
A. Earl Pritchard
openalex  

Morphology and development of the baculum in harbour seals (Phoca vitulina)

open access: yesJournal of Zoology, EarlyView.
This study examines the ontogenetic changes in the morphology of the penis bone in the harbour seal, focusing on the implications for sexual maturity and reproductive function. A large comparative dataset of approx. 300 genital bones from 1 year to over 20 years of age was used for analyses.
T. Berghäuser   +3 more
wiley   +1 more source

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