TAXONOMICAL VALUE OF ALISMA TRIVIALE PURSH AND ALISMA SUBCORDATUM RAFIN

1963 ◽  
Vol 41 (7) ◽  
pp. 1011-1013 ◽  
Author(s):  
Eugenia Pogan
Keyword(s):  
Chromosome Number ◽  
North American ◽  
Morphological Characters ◽  
The North

Detailed morphological and karyological studies have revealed that the North American taxa of the Alisma plantago-aquatica complex are most appropriately classified as the two species, A. subcordatum Rafin. (2n = 14), and A. triviale Pursh (2n = 28). The morphological characters separating these species and distinguishing them from the European diploid, A. plantago-aquatica L., s. str., are given, and also the chromosome number of American material of A. gram-ineum Gmel. (2n = 14).

The North American Allies of Hylobius piceus (De Geer) (Coleoptera: Curculionidae)

1957 ◽  
Vol 89 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Stephen L. Wood
Keyword(s):  
North American ◽  
Distinct Species ◽  
Morphological Characters ◽  
North American Species ◽  
Winged Form ◽  
The North ◽  
The Status ◽  
Field Workers ◽  
Dimorphic Species ◽  
Biological Differences

While investigating the biology of the North American species of Hypomolyx, field workers in Manitoba found a vestigial, or short-winged, and a long-winged form under apparently identical conditions in about equal numbers. Although biological differences were nor then apparent, there was doubt as to whether they were dealing with one dimorphic species or with two distinct species, A search for morphological characters brought to light numerous differences between the two forms, supporting the view that two species were present. These differences, a description the previously unrecognized species, and notes concerning the status of the genera Hylobius and Hypomolyx are reported below.

scholarly journals Detailed description and illustration of larva, pupa and imago of Holorusia mikado (Westwood, 1876) (Diptera: Tipulidae) from Japan

2021 ◽  
Vol 9 ◽  
Author(s):  
Levente-Péter Kolcsár ◽  
Takeyuki Nakamura ◽  
Daichi Kato ◽  
Kozo Watanabe
Keyword(s):  
Leaf Litter ◽  
North American ◽  
Morphological Characters ◽  
Wide Distribution ◽  
Female Genitalia ◽  
Immature Stages ◽  
Aquatic Habitats ◽  
Male And Female ◽  
The North ◽  
First Time

Holorusia Loew, 1863 (Diptera: Tipulidae) is a relatively large crane fly genus with a wide distribution in the Afrotropic, Australasian–Oceanian, Eastern Palearctic, Oriental and Nearctic Regions. Although the genus is well known to include the largest crane fly species, the immature stages are, thus far, only described for the larva and pupa of the North American Holorusia hesperea Arnaud & Byers, 1990. In this study, we describe for the first time the egg, larva and pupae of the Japanese Holorusia mikado (Westwood, 1876). Larvae were collected from semi-aquatic habitats, from slow flowing areas of streams and small waterfalls where leaf litter accumulates; the larvae are detritivores and feed on wet, decomposing leaves. The larvae were reared to adults in the laboratory. Morphological characters of immature stages discussed with comparison with the North American H. hespera. Male and female genitalia are illustrated and described in detail for the first time.

scholarly journals Intra- and interpopulation variability of Solidago canadensis L. s. l. in Belarus

2019 ◽  
pp. 67-78
Author(s):  
Valery N. Tikhomirov ◽  
Iryna A. Ravenskaya
Keyword(s):  
North American ◽  
Spontaneous Mutation ◽  
Morphological Characters ◽  
North American Species ◽  
Point Of View ◽  
Solidago Canadensis ◽  
The North ◽  
Ray Florets ◽  
The Republic ◽  
Average Plant

The study of the variability of 22 morphological characters in 5 populations of Solidago canadensis L. s. l., growing in the city of Minsk and its environs, was carried out. Comparison of the obtained data with previously published information on the nature and range of variability of the North American taxa Solidago subsect. Triplinerviae showed that plants growing on the territory of the Republic of Belarus cannot be unambiguously assigned to any of the North American species by the combination of morphological characters. Compared to North American taxa, the plants of the studied populations have a significantly more powerful habitus (a large average plant height, longer and in many populations broader mid stem leaves, most often a larger inflorescence), intermediate in comparison with S. canadensis s. str. and S. altissima s. str. and significantly different from both North American species, the length of involucres and the length of tubular flowers, significantly longer outer phyllaries, shorter straps of ray florets, larger ovaries of ray florets, but their shorter pappus, a significantly smaller number of disc florets. The disc florets have significantly larger teeth compared to S. canadensis s. str. and S. altissima s. str. The data obtained confirm the point of view of Hildemar Scholz, according to which the invasive goldenrod, which is currently widely distributed throughout Europe, are of European origin. Most likely, they are either stabilized hybrids that arose during breeding due to the crossing of several North American species, or arose as a result of spontaneous mutation and further selection under natural conditions.

The separation of Carex disticha and Carex sartwellii and the status of Carex disticha in North America

1988 ◽  
Vol 66 (11) ◽  
pp. 2323-2330 ◽  
Author(s):  
P. M. Catling ◽  
A. A. Reznicek ◽  
B. S. Brookes
Keyword(s):  
North American ◽  
Principal Component ◽  
Small Region ◽  
Morphological Characters ◽  
Scatter Diagram ◽  
The North ◽  
The Status ◽  
Beak Length ◽  
The Relationship ◽  
Distinguishing Features

To clarify the relationship between the Eurasian Carex disticha and the North American Carex sartwellii, 38 morphological characters were measured in 30 specimens of each. Various qualitative features were also scored. Through analysis of variance (ANOVA), a reduced number of 10 important continuous characters was obtained and the sample of each taxon was increased to 50. ANOVA of these 10 characters revealed that perigynium length and perigynium beak length were the most important discriminating characters, but in a scatter diagram of these two, 15% of the sample occupied a region of overlap. Principal-component analysis and discriminant analysis using the 10 characters resulted in a separation of the two groups, but a small region of overlap existed in both cases. The two taxa are distinct by virtue of accumulation of small morphological and other differences in a number of characters, rather than by sharp differentiation in a few characters. Carex disticha has larger perigynia with beaks (0.8–)1–1.5(–2.3) mm long, whereas C. sartwellii has smaller perigynia with beaks 0.4–1(–1.2) mm long. All distinguishing features are discussed and a key is provided. Immature vouchers for the occurrence of C. disticha in southwestern Quebec are confirmed on the basis of features of the inflorescence. The only other North American station of C. disticha, discovered in Simcoe Co., Ontario, in 1972 and extant in 1986, is also confirmed in the numerical analyses.

scholarly journals Phylogenomic Analyses Clarify True Species within the Butterfly Genus Speyeria despite Evidence of a Recent Adaptive Radiation

Insects ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 209
Author(s):  
Erin Thompson ◽  
Jason Baumsteiger ◽  
Ryan I. Hill
Keyword(s):  
Adaptive Radiation ◽  
North American ◽  
Incomplete Lineage Sorting ◽  
Legal Protection ◽  
Evolutionary Model ◽  
Morphological Characters ◽  
Anthropogenic Factors ◽  
Lineage Sorting ◽  
The North ◽  
Phylogenetic Resolution

When confronted with an adaptive radiation, considerable evidence is needed to resolve the evolutionary relationships of these closely related lineages. The North American genus Speyeria is one especially challenging radiation of butterflies due to potential signs of incomplete lineage sorting, ongoing hybridization, and similar morphological characters between species. Previous studies have found species to be paraphyletic and have been unable to disentangle taxa, often due to a lack of data and/or incomplete sampling. As a result, Speyeria remains unresolved. To achieve phylogenetic resolution of the genus, we conducted phylogenomic and population genomic analyses of all currently recognized North American Speyeria species, as well as several subspecies, using restriction-site-associated DNA sequencing (RADseq). Together, these analyses confirm the 16 canonical species, and clarify many internal relationships. However, a few relationships within Speyeria were poorly supported depending on the evolutionary model applied. This lack of resolution among certain taxa corroborates Speyeria is experiencing an ongoing adaptive radiation, with incomplete lineage sorting and lack of postzygotic reproductive barriers contributing to hybridization and further ambiguity. Given that many Speyeria taxa are under duress from anthropogenic factors, their legal protection must be viewed cautiously and on a case by case basis in order to properly conserve the diversity being generated.

A new species within the Eurytemora affinis complex (Copepoda: Calanoida) from the Atlantic Coast of USA, with observations on eight morphologically different European populations

Zootaxa ◽  
2011 ◽  
Vol 2767 (1) ◽  
pp. 41 ◽  
Author(s):  
VICTOR R. ALEKSEEV ◽  
ANISSA SOUISSI
Keyword(s):  
New Species ◽  
North American ◽  
Atlantic Coast ◽  
River Estuary ◽  
Morphological Characters ◽  
Cylindrical Shape ◽  
Eurytemora Affinis ◽  
Lawrence Estuary ◽  
The North ◽  
Caudal Rami

Eurytemora carolleeae sp. nov. (Crustacea: Copepoda: Calaniformes) is described from the Chesapeake Bay, USA. The new species belongs to the Atlantic clade of the Eurytemora affinis complex outlined by previously published molecular work but poorly characterized morphologically. To discriminate E. carolleeae we compare specimens from the Atlantic USA clade with specimens from the type population of E. affinis (Poppe, 1880) from the Elbe River Estuary (Germany), as well as with eight other European coastal populations. Several important morphological characters clearly separate the North American E. cf. affinis from the European clade that include both sexes: a large outside orientated dent on the mandible, and clearly observable seta segmentation in the caudal rami and swimming legs. Unlike E. affinis, the newly described species possesses wing-like outgrowths on the genital double-somite and a very small spine near the distal seta insertion point in P5 in females. In males, the specific characters include naked dorsal and ventral sides of the caudal rami, and a cylindrical shape of exopod on the left P5, in contrast to a triangular shape of the segment in E. affinis. The new species was also found in Canada (St. Lawrence Estuary) and as an invasive species in the Baltic Sea. Eurytemora carolleeae is possibly widely distributed along the North American Atlantic coast, as well as in inland waters from Great Lakes to Mexico.

The evolutionary relationships of North American Diplous Motschulsky (Coleoptera:Carabidae:Patrobini) inferred from morphological and molecular evidence

2005 ◽  
Vol 19 (2) ◽  
pp. 145 ◽  
Author(s):  
Paul E. Marek ◽  
David H. Kavanaugh
Keyword(s):  
Phylogenetic Tree ◽  
North American ◽  
Morphological Evolution ◽  
Ground Beetle ◽  
Morphological Characters ◽  
Total Evidence ◽  
Molecular Evidence ◽  
Character State ◽  
The North ◽  
Key Species

Individuals of the ground beetle genus Diplous Motschulsky, 1850 occur in riparian areas predominately throughout boreal North America and Asia. In order to infer the species phylogeny of the North American Diplous, we examined 97 morphological characters (56 quantitative characters and 41 qualitative characters) and 458 bp of the mitochondrial cytochrome oxidase subunit I region. We used the four North American species, four Palearctic species, and one undescribed species of a closely related genus to test the monophyly and the direction of character state change in North American Diplous. Overall, we found that North American Diplous appear to represent a monophyletic group, but that the morphological and molecular evidence did not support the same relationships in the placement of one of the species. We found that the total evidence trees agreed most with biogeography and considerations of accelerated morphological evolution. In this paper, we present a morphological phylogenetic tree, a molecular phylogenetic tree, a total evidence phylogenetic tree, a species key, species diagnoses, and a distribution map of Nearctic Diplous.

New species and emendations of Orphella: taxonomic and phylogenetic reassessment of the genus to establish the Orphellales, for stonefly gut fungi with a twist

Mycologia ◽  
2018 ◽  
Vol 110 (1) ◽  
pp. 147-178 ◽  
Author(s):  
White ◽  
Guàrdia Valle ◽  
Lichtwardt ◽  
Siri ◽  
Strongman ◽  
...  
Keyword(s):  
New Species ◽  
North American ◽  
Morphological Characters ◽  
Molecular Data ◽  
Cascade Range ◽  
New Order ◽  
The North ◽  
Smoky Mountains ◽  
Sexual Stages ◽  
Three New Species

We consolidate and present data for the sexual stages of five North American species of Orphella, fungal members of trichomycetes previously classified within Harpellales. Three species emendations accommodate the newly recognized characters, including not only the coiled zygospores and accompanying cells but also other morphological traits not provided in the original descriptions for O. avalonensis, O. haysii, and O. hiemalis. We describe three new species, Orphella cataloochensis from both the Smoky Mountains in USA and two provinces in Canada as well as O. pseudoavalonensis and O. pseudohiemalis, both from the Cascade Range, in Oregon, USA. Key morphological features for all known species are summarized and reviewed, with illustrations of some of the North American taxa to update and supplement the literature. The entire suite of morphological characters is discussed, with emphasis on species relationships and hypotheses on possible vicariant origins. We also present a molecular phylogeny based on nuc rDNA 18S and 28S, which supports Orphella as a lineage distinct from Harpellales, and we establish a new order, Orphellales, for it. With the combination of sexual features, now known for 12 of the 14 species of Orphella, and new molecular data, the group is now better characterized, facilitating and hopefully also promoting future studies toward a better understanding of their relationships, origins, and evolutionary history as stonefly gut–dwelling fungi.

The phylogenetic placement of the rare North American band-winged grasshopper Shotwellia isleta Gurney, 1940 (Orthoptera: Acrididae: Oedipodinae)

2010 ◽  
Vol 41 (4) ◽  
pp. 303-316 ◽  
Author(s):  
David Lightfoot ◽  
Kelly Miller ◽  
William Edelman
Keyword(s):  
North American ◽  
Chihuahuan Desert ◽  
Cladistic Analysis ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
Phylogenetic Placement ◽  
The North ◽  
Species Of Conservation Concern ◽  
Molecular Phylogenetic ◽  
Conservation Concern

AbstractThe phylogenetic placement of the North American band-winged grasshopper Shotwellia isleta (Gurney 1940) (Orthoptera: Acrididae: Oedipodinae) has been investigated. This rare and unique species of grasshopper belongs to a monotypic genus known only from a few isolated locations in the Chihuahuan Desert of Mexico and New Mexico, USA. The taxonomic status of Shotwellia has been uncertain and historically classified in very different ways relative to other genera. We conducted the first molecular phylogenetic cladistic analysis of Shotwellia and of the Chortophaga (Saussure) genus group in which it is currently classified, using three mitochondrial genes (16S, 12S and cytochrome c oxidase II), 14 morphological characters and two behavioral characters. Our analysis supports the current monotypic status of the genus Shotwellia within the Chortophaga genus group and indicates that Shotwellia is sister to the other genera in that group. Shotwellia isleta is a species of conservation concern, and our field sampling indicates that it is a rare specialist of freshwater ephemeral desert lake beds that are being impacted by human activity. Understanding the phylogeny of S. isleta provides a basis from which biological, evolutionary and conservation inferences can be made.

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