Now showing items 41-50 of 84
FISHES OF THE MIO-PLIOCENE WESTERN SNAKE RIVER PLAIN AND VICINITY
(2016-10-14)
Salmon are iconic fishes of the North Pacific Rim. The evolution of Pacific salmon, formerly thought to be an ice age phenomenon, is now known to date back at least to the middle Miocene. We report nine lineages of salmons, ...
Morphometric comparison of the neotype of Asterionella formosa Hassall (Heterokontophyta,Bacillariophyceae) with Asterionella edlundii sp. nov. from Lake Hovsgol, Mongolia
(2003)
We conducted a morphometric study to compare Asterionella specimens from Lake Hovsgol, Mongolia with the neotype specimens of A. formosa Hassall from the Glienicker See, Berlin, Germany. Specimens were digitized and ...
Three new North American species of Gomphinae (Odonata)
(University of Michigan Museum of Zoology, 2007-10-16)
MORPHOLOGICAL DESCRIPTION OF THE EXTINCT NORTH AMERICAN SUCKER, MOXOSTOMA LACERUM, (OSTARIOPHYSI, CATOSTOMIDAE), BASED ON HIGH-RESOLUTION X-RAY COMPUTED TOMOGRAPHY
(2009-05-06)
Moxostoma lacerum was the first member of the North American ichthyofauna to be documented as extinct. The oral morphology of the species has been of interest, as it is unusual and unique, as was its diet of small snails. ...
Calculating shape descriptors from Fourier analysis: shape analysis of Asterionella (Heterokontophyta, Bacillariophyceae)
(2001-12)
In our study, shape descriptors were calculated for specimens from the diatom genus Asterionella, using the method of arc lengths and tangent angles in Fourier analsyis. Asterionella species are character-poor, populations ...
QUANTIFYING AND ANALYZING SURFACE FEATURES IN FOSSILS USING 3D DATA
(2010-10-31)
Characterizing the surface features of organisms can be useful for addressing a wide range of questions in paleontology and neontology. The ability to do so in a quantitative and explicit way permits analysis both within ...
A Prolegomenon to the Systematics of South American Cottontail Rabbits (Mammalia, Lagomorpha, Leporidae: Sylvilagus): Designation of a Neotype for S. brasiliensis (Linnaeus, 1758), and Restoration of S. andinus (Thomas, 1897) and S. tapetillus Thomas, 1913.
(2017-02-09)
A critical issue with species names derived from Linnaeus’ 10th edition of the Systema Naturae is the lack of holotypes, which in many instances has led to taxonomic confusion and uncertainty, as well as an unstable taxonomy. ...
Legendre shape descriptors and shape group determination of specimens in the Cymbella cistula species complex
(2003)
Ten Legendre shape descriptors were calculated for 66 specimens in the Cymbella cistula species complex from the Great Lakes. One-hundred x,y co-ordinates were used to calculate the width function W(x)=∑b P(x) to obtain ...