A new species of Diplotaxodon (Cichliformes: Cichlidae) from Lake Malaŵi

Zootaxa ◽  
2021 ◽  
Vol 4903 (2) ◽  
pp. 275-284
Author(s):  
JAY R JR. STAUFFER ◽  
ADRIANUS F. KONINGS
Keyword(s):  
New Species ◽  
Principal Components Analysis ◽  
Principal Components ◽  
Cichlid Fish ◽  
Lake Malawi ◽  
Type Specimens ◽  
Snout Length ◽  
Haplochromine Cichlid ◽  
Components Analysis ◽  
A New Species

A species of haplochromine cichlid fish of the genus Diplotaxodon Trewavas, endemic to Lake Malaŵi is described: Diplotaxodon dentatus, new species. All eight type specimens were trawled together off Thumbi East Island in the Southeastern arm of the lake at 73 meters in 1985. They were initially identified as D. argenteus because the teeth on the oral jaws were fully exposed with a closed mouth. The shorter snout length of D. dentatus (26.6–29.2 % HL) clearly separates it from D. argenteus (31.7–34.2 % HL). A plot of a principal components analysis further supports the separation of D. dentatus from D. argenteus. 

scholarly journals Phegopteris excelsior (Thelypteridaceae): A New Species of North American Tetraploid Beech Fern

2019 ◽  
Vol 27 (4) ◽  
pp. 211-218 ◽  
Author(s):  
Nikisha R. Patel ◽  
Susan Fawcett ◽  
Arthur V. Gilman
Keyword(s):  
New Species ◽  
North America ◽  
Principal Components Analysis ◽  
Principal Components ◽  
North American ◽  
Northeastern North America ◽  
Specific Rank ◽  
Components Analysis ◽  
Morphological Differences ◽  
A New Species

Since the 1970s, an apomictic tetraploid beech fern (genus Phegopteris (C. Presl) Fée) has been known in northeastern North America. Previously published isozyme data suggest that this lineage is of allopolyploid origin involving long beech fern (P. connectilis (Michx.) Watt.) but not broad beech fern (P. hexagonoptera (Michx.) Fée), as originally hypothesized. Its second progenitor remains unknown. We performed a principal components analysis of the apomict and its North American congeners to elucidate morphological differences between them. We recognize the apomictic tetraploid at specific rank as P. excelsior N. R. Patel & A. V. Gilman and provide an illustration, a range map, a list of exsiccatae, and a key to Phegopteris species of North America.

Carex xueyingiana (Cyperaceae), a new species from Hainan Island, China

Phytotaxa ◽  
2017 ◽  
Vol 308 (2) ◽  
pp. 239
Author(s):  
HAIJUN YANG ◽  
HAN XU ◽  
YUNFEI DENG ◽  
YIDE LI
Keyword(s):  
Cluster Analysis ◽  
New Species ◽  
Principal Components Analysis ◽  
Principal Components ◽  
Hainan Island ◽  
Morphological Characters ◽  
Components Analysis ◽  
A New Species

A new species of Carex (Cyperaceae), Carex xueyingiana, from section Radicales, is described and illustrated from Hainan Island, China. We analyzed 35 morphological characters using Cluster Analysis and Principal Components Analysis to evaluate the relationships between the new species and the 15 species from the same section occurring in China. The new species is similar to C. chlorocephalula, displaying pubescent rhizomes, leaves densely hispidulous on both surfaces, and slender tufted culms. Carex xueyingiana differs from C. chlorocephalula by the leaves distinctly longer than culms (not equaling these), stems 4–6 mm wide (instead 1–3 mm), bracts sheath-like, 5–6 mm long (instead leaf-like and 2–3.5 cm long), spikes 7–10 mm long (instead 10–15 mm), and perigynium beakless (instead beaked). The new species is only known from Hainan Island and is assessed as Vulnerable (VU DD).

scholarly journals Resolving the anomaly of Lomatium anomalum: discovery of a new species in southwestern Idaho (U.S.A.) Lomatium andrusianum (Apiaceae)

2018 ◽  
Vol 12 (1) ◽  
pp. 1-15
Author(s):  
Mckayla Stevens ◽  
Donald H. Mansfield ◽  
James F. Smith ◽  
Mary Ann E. Feist
Keyword(s):  
New Species ◽  
Principal Components Analysis ◽  
Principal Components ◽  
Species Boundaries ◽  
Monophyletic Clade ◽  
Ecological Data ◽  
Components Analysis ◽  
Multiple Species ◽  
Vegetative Characters ◽  
A New Species

Apparent polyphyly within the unresolved clade of Lomatium (Apiaceae) containing L. triternatum, L. anomalum, L. thompsonii, and L. packardiae suggests conflict among current taxonomic classification schemes. To recover this clade and more clearly define species boundaries, we examined populations of L. anomalum from three geographic regions in Idaho and adjacent Oregon. Using phylogenetic, morphological, and ecological data, we conclude that the L. anomalum complex currently circumscribes multiple species. Phylogenetic analysis of the nuclear ribosomal ITS and ETS, and cpDNA rpl32-trnLUAG, rps-16 intron, trnD-trnT, ndhA intron, and psbA-trnH recovered populations from the Boise foothills as a distinct, monophyletic clade. Principal Components Analysis of 30 reproductive and vegetative characters show two distinct groups: one of Boise foothills and one of the combined Mann Creek and Camas Prairie vicinities. Principal Components Analysis of 16 soil characteristics show that soils occupied by Boise foothills populations are distinct from those occupied by Mann Creek and Camas Prairie populations. Based on phylogenetic, morphometric, and ecologic criteria, populations of what had been considered L. anomalum from the Boise foothills and vicinity are here described as a new species—Lomatium andrusianum. 

scholarly journals Hemitaeniochromis brachyrhynchus, a new species of cichlid fish from Lake Malaŵi, with comments on some other supposed members of the genus (Teleostei: Cichlidae)

Zootaxa ◽  
2012 ◽  
Vol 3410 (1) ◽  
pp. 35 ◽  
Author(s):  
MICHAEL K. OLIVER
Keyword(s):  
New Species ◽  
Type Species ◽  
Cichlid Fish ◽  
Lake Malawi ◽  
Undescribed Species ◽  
Lacrimal Bone ◽  
A New Species

Hemitaeniochromis brachyrhynchus, an anatomically distinctive and apparently rare new cichlid, is described and illus-trated from specimens collected at two widely separated localities within Lake Malaŵi. It is easily distinguished from H.urotaenia, type species of the genus, by its narrow lacrimal bone which is only one-third of the orbit length, a characterthought to be unique not only in Hemitaeniochromis but among all known Lake Malaŵi cichlids. The genus Hemitaenio-chromis Eccles & Trewavas (1989) is redefined to allow provisional inclusion of this new species. Two species placed inProtomelas by Eccles & Trewavas (1989) [P. insignis (Trewavas) and P. spilopterus (Trewavas)] were recently transferredto Hemitaeniochromis by some authors, without much evidence. The generic placement of these controversial taxa, and of several undescribed species known only from underwater photographs, is briefly reconsidered.

Diagnoses Generated by Numerical Taxonomic Methods Applied to Standard Blood Variables

1980 ◽  
Vol 19 (04) ◽  
pp. 205-209
Author(s):  
L. A. Abbott ◽  
J. B. Mitton
Keyword(s):  
Liver Cirrhosis ◽  
Renal Disease ◽  
Principal Components Analysis ◽  
Discriminant Function ◽  
Principal Components ◽  
Discriminant Function Analysis ◽  
Chronic Renal Disease ◽  
Function Analysis ◽  
Infectious Hepatitis ◽  
Components Analysis

Data taken from the blood of 262 patients diagnosed for malabsorption, elective cholecystectomy, acute cholecystitis, infectious hepatitis, liver cirrhosis, or chronic renal disease were analyzed with three numerical taxonomy (NT) methods : cluster analysis, principal components analysis, and discriminant function analysis. Principal components analysis revealed discrete clusters of patients suffering from chronic renal disease, liver cirrhosis, and infectious hepatitis, which could be displayed by NT clustering as well as by plotting, but other disease groups were poorly defined. Sharper resolution of the same disease groups was attained by discriminant function analysis.

Sign in / Sign up

Export Citation Format

Share Document