Publisher Summary This chapter reviews the current knowledge of variation in sperm
morphology over several levels of biological organization: variation within males (both within …

Iguanian lizards form a diverse clade whose members have been the focus of many
comparative studies of ecology, behavior, and evolution. Despite the importance of …

Islands are thought to facilitate adaptive radiation by providing release from competition and
predation. Anole lizards are considered a classic example of this phenomenon: different …

One of the recurrent themes in historical biogeography relates to the units of analysis, their
definition and identification. Although areas of endemism are usually accepted as the …

abstract The historical biogeography of the lizard clade Iguanidae is complicated. In addition
to difficulties within the New World, where most of the more than 900 living species are …

Morphological cladograms of vertebrates are often inferred from greater numbers of
characters describing the skull and teeth than from postcranial characters. This is either …

The systematics of the widespread neotropical gekkonid genus Thecadactylus is
investigated using a combination of morphological, morphometric and mtDNA (cytochrome …

A fragmentary fossil lizard from Uquía Formation (Late Pliocene), Jujuy Province, Argentina,
is described. The material consists of disarticulated cranial bones from the snout and jaw …

Despite increased use of genomic data in phylogenetics, morphological information remains
vital for resolving evolutionary relationships, particularly for fossil taxa. The properties and …

Spermatogenesis, the remarkable process of morphological and biochemical transformation
and cell division of diploid stem cells into haploid elongated spermatozoa, is one of the most …