Invertebrates - Field Museum The large holdings of eastern U S species, in particular of the Leslie Hubricht collection, comprise a unique resource for ecological, environmental, systematic and other studies The freshwater mollusks are estimated to number 45,000 lots (about two-thirds gastropods and one-third bivalves)
Recent advances on phylogenomics of gymnosperms and a new . . . The low species diversity of modern gymnosperms is largely explained by Cenozoic extinction of ancient lineages (Crisp and Cook, 2011); however many extant species originated from recent (Miocene) re-diversification (Davis and Schaefer, 2011; Nagalingum et al , 2011)
Sloth - Wikipedia Bradypodidae, the three-toed sloths, contains four extant species: The brown-throated three-toed sloth (Bradypus variegatus) is the most common of the extant species of sloth, which inhabits the Neotropical realm [1] [9] in the forests of South and Central America
Two-hundred million years of anuran body-size evolution in . . . Here, we characterize body-size evolution among 2,434 anuran species (35% of extant taxa) across an estimated 200 million years of anuran history (Feng et al , 2017) to test hypotheses of body-size evolution in a phylogenetic framework We first characterize macroevolutionary patterns in anuran body size by fitting Bayesian models of adaptive
Species We Study: Amphibians | U. S. Geological Survey - USGS. gov This dataset contains the number of captured individuals recorded for each amphibian species surveyed in all wetlands in the Cottonwood Lake Study Area, Stutsman County, North Dakota While amphibians were the target of the surveys, reptiles (i e , turtles, snakes) were also captured over the course of the surveys and are included in the data file
10 Fast Facts About Amphibians - ThoughtCo Naturalists divide amphibians into three main families: frogs and toads; salamanders and newts; and the strange, worm-like, limbless vertebrates called caecilians There are currently about 6,000 species of frogs and toads around the world, but only one-tenth as many newts and salamanders and even fewer caecilians
Enigmatic amphibians in mid-Cretaceous amber were chameleon . . . The holotype (GRS-Ref-060829) is the first fully articulated three-dimensional skull of an albanerpetontid (Fig 1, A and G to N, and supplementary text S2 2) It is 12 18 mm in overall length (snout tip to occiput), giving an estimated snout-to-pelvis length (SPL) of 52 mm [based on the proportions of Celtedens ibericus ()]