Morphometric Variation within and between Populations of Rhopalosiphum maidis with a Discussion of the Taxonomic Treatment of Permanently Parthenogenetic Aphids (Homoptera: Aphididae)

1991 ◽  
Vol 16 (2) ◽  
pp. 97-113 ◽  
Author(s):  
Roger L. Blackman ◽  
Paul A Brown
Keyword(s):  
Morphometric Variation ◽  
Rhopalosiphum Maidis ◽  
Taxonomic Treatment

A New Species of Oxylobus (Asteraceae: Eupatorieae) and Updated Taxonomic Treatment of the Genus

2019 ◽  
Vol 44 (3) ◽  
pp. 719-735
Author(s):  
Rosario Redonda-Martínez ◽  
Esteban Manuel Martínez Salas
Keyword(s):  
New Species ◽  
Taxonomic Treatment ◽  
A New Species

MORPHOMETRIC VARIATION OF GENUS DOBSONIA FROM INDONESIAN PAP

2010 ◽  
Vol 9 (1) ◽  
Author(s):  
Aksamina M Yohanita ◽  
Bambang Suryobroto ◽  
Agustinus Suyanto
Keyword(s):  
Scatter Plot ◽  
Morphometric Variation

<p><em>Studi morfometrik telah dilakukan dengan mengukur 32 karakter </em><em>dari </em><em>176 spesimen Dobsonia dari Papua. Spesimen-spesimen Dobsonia diwakili oleh enam OTU, yaitu G, B, R, E, SP1, dan SP2. Analisis univariat menghitung seluruh spesimen dewasa yang terdiri dari 171 karakter badan dan sayap dan 176 karakter tengkorak dan gigi pada enam OTU tersebut. Selanjutnya </em><em>digunakan uji-t</em><em> dan PCA </em><em>untuk </em><em>menghitung G, B, dan R, sedangkan tiga OTU lain (E, SP1 dan SP2) tidak dihitung tetapi ikut diproyeksikan ke dalam scatter plot. Hasil </em><em>uji-t </em><em> (p&lt;0.05) menunjukkan ada seksual dimorfisme pada D. minor dan D. beauforti. </em><em>Pemisahan </em><em> </em><em>D. magna, D. minor, </em><em>dan </em><em>D. beauforti nyata pada karakter badan, sayap, dan gigi berdasarkan PCA. D. emersa terpisah dari spesies lainnya pada karakter badan dan tengkorak. Hasil scatter plot pada SP1 dan SP2 mengelompok dengan D. beauforti pada semua karakter (badan, sayap, tengkorak, dan gigi). Sebanyak 32 karakter yang diukur didapatkan karakter taksonomi yaitu WT, HB, dan TV untuk karakter badan; FA, TIB, dan DIG1P untuk karakter sayap; ONL, POW, PL, dan MH untuk karakter tengkorak; I<sup>2</sup>M<sup>2</sup>, M<sup>2</sup>M<sup>2</sup>, WM<sup>1</sup>, dan LM<sup>1</sup> untuk karakter gigi. D. minor yang telah ditemukan di Pulau Waigeo tahun 2007 merupakan catatan baru penyebaran spesies ini, sebelumnya hanya tercatat di </em><em>daratan utama </em><em>Papua dan Pulau Yapen.  </em></p>

Taxonomic Treatment of the Tillandsia utriculata Complex (Bromeliaceae)

2019 ◽  
Vol 104 (2) ◽  
pp. 262-323
Author(s):  
Juan P. Pinzón ◽  
Ivón M. Ramírez-Morillo ◽  
Germán Carnevali ◽  
Walter Till ◽  
Derek Butcher ◽  
...  
Keyword(s):  
Diagnostic Characters ◽  
Taxonomic Treatment ◽  
Reproductive Structures ◽  
Taxonomic Information

The taxonomic treatment of the 18 species composing the Tillandsia utriculata L. complex s.l. is presented. A description and a diagnosis of the group are provided, as well as two artificial keys to species, each emphasizing characters from living plants or from exsiccatae, respectively. Complete taxonomic information is given, including taxonomic citation, synonymy, etymology or eponimy, description, specimens examined, phenology, nomenclatural notes, relationships and diagnostic characters, variation, ecology and distribution, together with plates of living plants and vegetative and reproductive structures, as well as maps of distribution.

scholarly journals Morphological Variations of Wild Populations of Brycon dentex (Characidae, Teleostei) in the Guayas Hydrographic Basin (Ecuador). The Impact of Fishing Policies and Environmental Conditions

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1901
Author(s):  
Ana Gonzalez-Martinez ◽  
Carmen De-Pablos-Heredero ◽  
Martin González ◽  
Jorge Rodriguez ◽  
Cecilio Barba ◽  
...  
Keyword(s):  
Discriminant Analysis ◽  
Environmental Conditions ◽  
Anthropogenic Activity ◽  
Freshwater Species ◽  
Fishing Pressure ◽  
Wild Populations ◽  
Morphometric Variation ◽  
Morphological Variations ◽  
Body Development ◽  
The Impact

The Guayas, located in Ecuador, is the largest basin in the Pacific Ocean and has an inventory of 123 native freshwater species. Most of these are endemic species that are threatened or at-risk due to anthropogenic activity and the modification, fragmentation, and destruction of habitats. The aim of this study was to determine the morphometric variation in three wild populations of Brycon dentex in the Guayas basin rivers and their connections to fishing management and environmental conditions. A total of 200 mature fish were captured, and 26 morphometric parameters were measured. The fishing policies (Hypothesis 1) and environmental conditions (Hypothesis 2) were considered fixed factors and were validated by t-tests. The morphological variation among the three populations (Hypothesis 3) was validated through a discriminant analysis. Fishing policies and resource management were found to generate morphological differences associated with body development. In addition, the environmental conditions were found to influence the size and structure of Brycon dentex populations. The analyzed populations were discriminated by the generated morphometric models, which differentiated Cluster 1 (Quevedo and Mocache rivers) with high fishing pressure from Cluster 2 (Pintado river) with medium–low fishing pressure. Morphometric differentiation by discriminant analysis is a direct and economic methodology that can be applied as an indicator of diversity maintenance.

Morphometric variation in oaks of the Apostle Islands in Wisconsin: evidence of hybridization betweenQuercus rubraandQ. ellipsoidalis(Fagaceae)

1993 ◽  
Vol 80 (11) ◽  
pp. 1358-1366 ◽  
Author(s):  
Richard J. Jensen ◽  
Stan C. Hokanson ◽  
J. G. Isebrands ◽  
James F. Hancock
Keyword(s):  
Morphometric Variation

scholarly journals Phylogeny and biogeography of midwife toads (Alytes, Discoglossidae): a reappraisal

1997 ◽  
Vol 66 (4) ◽  
pp. 257-262
Author(s):  
Cristian R. Altaba
Keyword(s):  
Data Base ◽  
Saline Lakes ◽  
Genetic Distances ◽  
Sister Species ◽  
Phylogenetic Hypothesis ◽  
Allozyme Data ◽  
Taxonomic Treatment ◽  
Discrete Character ◽  
Break Up ◽  
The One

The allozyme data base of Arntzen & García-París (1995) on midwife toads (Alytes, Discoglossidae) is reanalysed considering each locus as a discrete character. The phylogeny thus inferred differs from the one obtained with genetic distances in the position of A. dickhilleni from the Betic region – it appears that its sister species is the widespread A. obstetricans, not the Mallorcan endemic A. muletensis. This phylogenetic hypothesis agrees with the taxonomic treatment of the genus based on morphology. A testable biogeographic hypothesis is proposed to account for the diversification of midwife toads in Iberia and the Balearics. The postulated underlying geological changes were the spread of inland saline lakes that divided Iberia (16 mY B.P.), the emergence and break-up of the Betic orogen (14 mY), and the formation of the Betic Strait (8 mY). Dispersal over sea channels or during the Messinian Crisis (6 mY) are deemed unlikely on the basis of ecological and biogeographical data.

scholarly journals Molecular systematics of pinniped hookworms (Nematoda: Uncinaria): species delimitation, host associations and host-induced morphometric variation

2013 ◽  
Vol 43 (14) ◽  
pp. 1119-1132 ◽  
Author(s):  
Steven A. Nadler ◽  
Eugene T. Lyons ◽  
Christopher Pagan ◽  
Derek Hyman ◽  
Edwin E. Lewis ◽  
...  
Keyword(s):  
Molecular Systematics ◽  
Species Delimitation ◽  
Morphometric Variation ◽  
Host Associations

Revision of the Metallactus kollari species-group with a new diagnosis of the genus (Coleoptera: Chrysomelidae: Cryptocephalinae)

Zootaxa ◽  
2018 ◽  
Vol 4413 (1) ◽  
pp. 57
Author(s):  
DAVIDE SASSI
Keyword(s):  
Type Species ◽  
Species Group ◽  
Identification Key ◽  
Original Diagnosis ◽  
Taxonomic Treatment ◽  
Species Groups ◽  
New Diagnosis ◽  
Good Resource

The genus Metallactus has been controversial since its introduction due to the ambiguous nature of the original diagnosis. This has caused some confusion in the taxonomy of Neotropical Pachybrachina. In this work the morphology of endophallus, which is useful for the characterization of species groups in several groups of Coleoptera, including Cryptocephalinae, has been analyzed. This has proven to be a good resource also in the taxonomic treatment of the species belonging to the genus Metallactus. After a careful survey on most of the species described so far, the endophallus shape in Metallactus turned out to be remarkably distinctive and very promising in the delimitation of species groups. The present work includes: a) a new diagnosis of the genus Metallactus on the basis of the aedeagal anatomy; b) the designation of the type species of the nominal genus; c) the revision of a first species-group of the genus, including the type species, hereinafter called Metallactus kollari species-group. Before this revision, catalogues had been reporting 13 species attributable to this group, in the present work three species have been synonymized and seven have been described as new to science. Therefore, the group includes 17 species. The species described as new are: Metallactus rileyi n. sp., M. bellatrix n. sp., M. longicornis n. sp.; M. londonpridei n. sp., M. regalini n. sp., M. bezoar n. sp., M. guarani n. sp. The new synonymies are as follows: Metallactus albipes Suffrian, 1866 (= M. nigrofasciatus Suffrian, 1866 n. syn.), M. albifrons Suffrian, 1866 (= M. flavofrontalis Jacoby, 1907 n. syn.), M. dodecastictus Suffrian, 1866 (= Griburius nigritarsis Jacoby, 1907 n. syn.). The lectotypes of all previously described species have been designated. The new synonymies, the name-bearing type fixations and designations and the nomenclatural acts have been critically discussed. An identification key for the species-group is also provided. 

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