The systematics of Australian Daphnia (Cladocera: Daphniidae). Multivariate morphometrics

Hydrobiologia ◽  
1988 ◽  
Vol 166 (2) ◽  
pp. 163-182 ◽  
Author(s):  
John A. H. Benzie
Keyword(s):  
Multivariate Morphometrics

scholarly journals A revised taxonomy of Asian snail-eating snakes Pareas (Squamata, Pareidae): evidence from morphological comparison and molecular phylogeny

ZooKeys ◽  
2020 ◽  
Vol 939 ◽  
pp. 45-64
Author(s):  
Ping Wang ◽  
Jing Che ◽  
Qin Liu ◽  
Ke Li ◽  
Jie Qiong Jin ◽  
...  
Keyword(s):  
New Species ◽  
Bayesian Inference ◽  
Molecular Phylogeny ◽  
Morphological Data ◽  
Multivariate Morphometrics ◽  
Cryptic Diversity ◽  
Cyt B ◽  
Morphological Comparison ◽  
The Family ◽  
Two New Species

The Asian snail-eating snakes Pareas is the largest genus of the family Pareidae (formerly Pareatidae), and widely distributed in Southeast Asia. However, potential diversity remains poorly explored due to their highly conserved morphology and incomplete samples. Here, on basis of more extensive sampling, interspecific phylogenetic relationships of the genus Pareas were reconstructed using two mitochondrial fragments (cyt b and ND4) and two nuclear genes (c-mos and Rag1), and multivariate morphometrics conducted for external morphological data. Both Bayesian Inference and Maximum Likelihood analyses consistently showed that the genus Pareas was comprised of two distinct, monophyletic lineages with moderate to low support values. Based on evidences from molecular phylogeny and morphological data, cryptic diversity of this genus was uncovered and two new species were described. In additional, the validity of P. macularius is confirmed.

Coexistence of perlid stoneflies (plecoptera): Predictions from multivariate morphometrics

Hydrobiologia ◽  
1980 ◽  
Vol 71 (1-2) ◽  
pp. 99-105 ◽  
Author(s):  
Andrew L. Sheldon
Keyword(s):  
Multivariate Morphometrics

A Comparison of the Gastric Mills of Nine Species of Parastacid Crayfish From a Range of Habitats, Using Multivariate Morphometrics (Decapoda, Astacoidea)

Crustaceana ◽  
1990 ◽  
Vol 58 (1) ◽  
pp. 33-44 ◽  
Author(s):  
A.M.M. Richardson ◽  
I.O. Growns
Keyword(s):  
Multivariate Morphometrics

Taxonomic studies in wall barley (Hordeum murinum sensu lato) and sea barley (Hordeum marinum sensu lato). 2. Multivariate morphometrics

1984 ◽  
Vol 62 (12) ◽  
pp. 2754-2764 ◽  
Author(s):  
Bernard R. Baum ◽  
L. Grant Bailey
Keyword(s):  
Discriminant Analysis ◽  
Nearest Neighbor ◽  
Sensu Stricto ◽  
Data Matrix ◽  
Multivariate Morphometrics ◽  
Stepwise Discriminant Analysis ◽  
Linear Discriminant ◽  
Specific Rank ◽  
Considerable Controversy ◽  
Taxonomic Studies

The demarcation of the Old World species in Hordeum L. section Hordeastrum Doell. has been the subject of considerable controversy. The present paper reports the results of a morphometric analysis of the wall and sea barleys (H. murinum L., H. marinum Huds., and their allies). A sample of 227 accessions was scored for 39 characters, and the resulting data matrix was divided into three groups on the basis of lodicules and cpiblast characters. These three groups were then subjected to several aspects of discriminant analysis (stepwise discriminant analysis, linear discriminant analysis, canonical analysis of discriminance, and nearest neighbor discriminant analysis) both on untransformed and log-transformed data. The results indicate that the wall and sea barleys consist of five distinct groups worthy of morphological specific rank. These correspond to H. marinum sensu stricto, H. geniculatum All., H. glaucum Steudel. H. murinum sensu stricto, and H. leporinum Link. Ranges for 37 characters within these five taxa are presented. A key to the five species and one hybrid (reported in the first paper of this series) is supplied. Our conclusions are discussed in the context of various taxonomic treatments of the group.

Differentiation in Coregonus zenithicus in Lake Superior

1980 ◽  
Vol 37 (12) ◽  
pp. 2228-2235 ◽  
Author(s):  
Thomas N. Todd ◽  
Gerald R. Smith
Keyword(s):  
Endangered Species ◽  
Great Lakes ◽  
Lake Superior ◽  
Distinct Species ◽  
Multivariate Morphometrics ◽  
Geographic Isolation ◽  
Allometric Growth ◽  
Spawning Time ◽  
Morphological Differences ◽  
Species Taxonomy

Morphological variation in Coregonus zenithicus has long plagued biologists working on Lake Superior ciscoes. Some of this variation is due to allometric growth; earlier workers incorrectly recognized large C. zenithicus as a distinct species, C. nigripinnis cyanopterus. Coregonus reighardi dymondi is a variant of C. zenithicus in northern bays of Lake Superior and Lake Nipigon. The morphological differences between members of spring and fall spawning populations of C. zenithicus in Lake Superior are no greater than those between geographically separate populations. We conclude that spawning time and geographic isolation act similarly in effecting differentiation of coregonine populations, and that populations with different spawning times do not necessarily represent different species.Key words: Coregonus zenithicus, cisco, Great Lakes, multivariate morphometrics, endangered species, taxonomy

scholarly journals Multivariate morphometrics of two Podisma species (Orthoptera: Acrididae) in Kunashiri Island.

2000 ◽  
Vol 35 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Haruki Tatsuta ◽  
Gen Ito ◽  
Alexander G. Bugrov ◽  
Alexei A. Tchernykh ◽  
Shin-ichi Akimoto
Keyword(s):  
Multivariate Morphometrics

Random Amplified Polymorphic Dna (Rapd) and Intraspecific Variation in Oerstedia Dorsalis (Hoplonemertea, Nemertea)

1995 ◽  
Vol 75 (2) ◽  
pp. 483-490 ◽  
Author(s):  
Per Sundberg ◽  
Susanne Andersson
Keyword(s):  
Intraspecific Variation ◽  
Morphometric Analysis ◽  
Random Amplified Polymorphic Dna ◽  
Type Specimen ◽  
The Other ◽  
Multivariate Morphometrics ◽  
Restricted Gene Flow ◽  
Enzyme Electrophoresis ◽  
North Wales ◽  
Polymorphic Species

INTRODUCTIONThe littoral/sublittoral hoplonemertean (phylum Nemertea) species Oerstedia dorsalis (Abildgaard, 1806) is described as polymorphic in external characters (Örsted, 1844; Burger, 1895; Brunberg, 1964). Sundberg (1984) grouped specimens in three classes based on external morphology and asked, using multivariate morphometrics, if there was a consistent correlation between external and internal characters. Such a correlation would have indicated a restricted gene flow between the externally different morphs, and thus the possibility of a group of species instead of one, polymorphic, species.One of the forms in Sundberg (1984) appeared to be different from the other two morphs but the morphometric analysis was inconclusive. Later, Sundberg & Janson (1988) established by enzyme electrophoresis that this form was genetically different and it was later described as Oerstedia striata (Sundberg, 1988). A problem both in Sundberg (1984), and Sundberg & Janson (1988) was that one of the groupings (class ‘C’ in both studies) of specimens subsumed a number of morphs, all speckled or dotted but to varying degrees. These morphs may in fact represent different species, which would have been concealed in the electrophoretic and morphometric analysis as merely increased intraspecific variation. One of the ‘C’ morphs in Sundberg (1984) and Sundberg & Janson (1988) is light brown with numerous small dark brown/black dorsal spots. Based on one specimen from Anglesey, North Wales, Gibson (1988) described Oerstedia (Paroerstedia) nigrimaculata which is externally similar to this variety. Envall & Sundberg (1993) could not find any differences in internal characters between the type specimen of O. nigrimaculata and the brown form of O. dorsalis but hesitated to conclude that O. nigrimaculata is a variety of O. dorsalis.

MULTIVARIATE MORPHOMETRICS

Taxon ◽  
1972 ◽  
Vol 21 (4) ◽  
pp. 515-516
Author(s):  
Pierre Legendre
Keyword(s):  
Multivariate Morphometrics
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