"The difference in petrographic character between the Bridger and Washakie has an important bearing on the problem of correlation in time. The Bridger rocks are rhyolite tuffs containing glassy sanidine while the Washakie ...

The current classification of weevils has witnessed vast improvements at higher phylogenetic levels, though much remains unstable at the lower levels. In order to develop a more robust morphological character system for ...

"A checklist of all available names of Ceratopogonidae is provided, including author, date of publication, page number of original description, and country or territory of the type locality. All validly named taxa described ...

"The neurocranium of the shark Xenacanthus (sensu lato) from the early Permian of Texas shares derived characters with the neurocrania of various other Paleozoic shark genera, including Tamiobatis, 'Cladodus,' 'Ctenacanthus,' ...

"The South American chaco is centrally situated on the border of the tropics and is xeric-adapted woodland with some open areas, wet places, and savanna. Driest in the center and wettest in the eastern pantanal savanna, ...