SYNONYMIC NOTES ON CANADIAN EUPITHECIAS (GEOMET., LEPID.)

1929 ◽  
Vol 61 (3) ◽  
pp. 59-69 ◽  
Author(s):  
J. McDunnough
Keyword(s):  
Single Species ◽  
Type Material ◽  
Individual Species ◽  
Wide Spread ◽  
Male And Female ◽  
Poor Condition ◽  
The Poor ◽  
Difficult Genus ◽  
The Individual ◽  
Female Genital

The excellent results obtained by a study of both male and female genital organs when determining specimens of this difficult genus in connection nith my paper on the “Lepidoptera of Seton Lake, B. C.” have led me to continue this work with a view to clearing up the numerous synonymical tangles in our Canadian species. The variability within the limits of a single species, the poor condition of much of the type material, and the failure of authors such as Taylor, Pearsall and Swett not only to recognize each other's species, but to realize the wide-spread distributiion of the individual species, hare all contributed to produce a muddle of specific names which has been almost impossible to unravel by a mere study of external characters.

THE CANADIAN SPECIES OF THE TORTRICID GENUS PERONEA

1934 ◽  
Vol 11 (3) ◽  
pp. 290-332 ◽  
Author(s):  
J. McDunnough
Keyword(s):  
North American ◽  
Present Knowledge ◽  
Food Plants ◽  
Individual Species ◽  
Larval Food ◽  
Male And Female ◽  
The North ◽  
The Individual ◽  
Range Of Variation ◽  
Female Genital

Forty-three species of the Tortricid genus Peronea are dealt with, comprising all the species known to occur in Canada at the present time and including practically all of the North American ones. Characters found in both the male and female genital organs have been used as a means of specific differentiation and there are eight sets of figures illustrating these organs. The range of variation in color and pattern of the individual species is briefly discussed and records of distribution and larval food-plants are given as far as present knowledge permits. Seven species new to science are described.

Equilibrium Models of Cities: 1. An Axiomatic Theory

1972 ◽  
Vol 4 (4) ◽  
pp. 429-444 ◽  
Author(s):  
J C Amson
Keyword(s):  
Equations Of State ◽  
Market Equilibrium ◽  
Single Species ◽  
State Equation ◽  
Individual Species ◽  
Axiomatic Theory ◽  
Equilibrium Equations ◽  
Equilibrium Configurations ◽  
Density Relation ◽  
The Individual

A study is undertaken of the concept of a city as an ‘urban gravitational plasma’ consisting of one or more species of civic matter (populations, activity rates, and so on) interacting on themselves and each other, and, at the same time, responding to relocation coercions induced by satisfaction potentials of various kinds (housing rentals, amenity levels, and so on). The latter are assumed to be coupled to the territorial densities of the individual species of civic matter through equations of state, for which the housing rental-population density relation in market equilibrium theory is a prototype. The study is divided into four parts. The first part (presented here) approaches the problem from a formal axiomatic viewpoint, and the axioms and definitions are discussed in relation to the real urban situations from which they are abstracted. The notion of equilibrium configurations for a city is introduced, and the general equilibrium equations necessary for their existence are developed. Three particular illustrations of these equations are offered: that of a single species city, and of a two species city—both with an ideal (polytropic) state equation—and that of a single species city with an imperfect (van der Waals) state equation. These illustrations will be examined in detail in the subsequent three parts of this study.

scholarly journals New species of deep-sea Antipatharians from the North Pacific (Cnidaria: Anthozoa: Antipatharia), Part 2

Zootaxa ◽  
2021 ◽  
Vol 4999 (5) ◽  
pp. 401-422
Author(s):  
DENNIS M. OPRESKO ◽  
TINA N. MOLODTSOVA
Keyword(s):  
New Species ◽  
North Pacific ◽  
Deep Sea ◽  
Type Material ◽  
Poor Condition ◽  
Incertae Sedis ◽  
The North ◽  
The Poor ◽  
The Family ◽  
The North Pacific

Five new species of deep-sea antipatharian corals are described from the North Pacific primarily collected off the coast of Alaska and on adjacent seamounts. All the species are referred to the family Schizopathidae. Described as new are: Alternatipathes mirabilis, Bathypathes ptiloides, Bathypathes tiburonae, Bathypathes alaskensis, and Parantipathes pluma. Illustrations of the type material of Bathypathes patula, B. patula var. plenispina and B. tenuis are provided for comparative proposes. Bathypathes patula var. plenispina is here recognized as a species distinct from B. patula, and B. tenuis is considered incertae sedis due to the poor condition of the type material.

scholarly journals Regularity underlies erratic population abundances in marine ecosystems

2015 ◽  
Vol 12 (107) ◽  
pp. 20150235 ◽  
Author(s):  
Jie Sun ◽  
Sean P. Cornelius ◽  
John Janssen ◽  
Kimberly A. Gray ◽  
Adilson E. Motter
Keyword(s):  
Extinction Risk ◽  
Single Species ◽  
Marine Species ◽  
Individual Species ◽  
Demographic Stochasticity ◽  
Key Factor ◽  
Species Population ◽  
Ecosystem Level ◽  
Management Approaches ◽  
The Individual

The abundance of a species' population in an ecosystem is rarely stationary, often exhibiting large fluctuations over time. Using historical data on marine species, we show that the year-to-year fluctuations of population growth rate obey a well-defined double-exponential (Laplace) distribution. This striking regularity allows us to devise a stochastic model despite seemingly irregular variations in population abundances. The model identifies the effect of reduced growth at low population density as a key factor missed in current approaches of population variability analysis and without which extinction risks are severely underestimated. The model also allows us to separate the effect of demographic stochasticity and show that single-species growth rates are dominantly determined by stochasticity common to all species. This dominance—and the implications it has for interspecies correlations, including co-extinctions—emphasizes the need for ecosystem-level management approaches to reduce the extinction risk of the individual species themselves.

Terebellidae (Polychaeta: Terebellida) from the Grand Caribbean region

Zootaxa ◽  
2009 ◽  
Vol 2320 (1) ◽  
pp. 1-93 ◽  
Author(s):  
MARIO H. LONDOÑO-MESA
Keyword(s):  
New Genus ◽  
Type Material ◽  
New Combination ◽  
Caribbean Region ◽  
New Combinations ◽  
Poor Condition ◽  
The Poor

Twenty-four genera of Terebellidae Grube, 1850, are described including one new genus and forty-four species recorded and characterized from the Grand Caribbean region. Six species are newly described: Lysilla caribe sp. nov., Polycirrus angeli sp. nov., Eupolymnia rullieri sp. nov., Euthelepus kritzleri sp. nov., Streblosoma tenhovei sp. nov., and Kritzlerius anomalus gen. nov. and sp. nov. Twenty-four formerly recorded species are regarded as valid: Biremis blandi Polloni, Rowe & Teal, 1973, Enoplobranchus sanguineus Verrill, 1873, Polycirrus holthei Londoño-Mesa & Carrera-Parra, 2005, P. pennulifera Verrill, 1900, P. purpureus Schmarda, 1861, Amphitritides bruneocomata (Ehlers, 1887), Eupolymnia crassicornis (Schmarda, 1861), Lanicola carus (Young & Kritzler, 1987), L. garciagomezi (Londoño-Mesa, 2006), Loimia minuta Treadwell, 1929, L. salazari Londoño-Mesa & Carrera-Parra, 2005, Neoamphitrite glasbyi LondoñoMesa & Carrera-Parra, 2005, P. palmata (Verrill, 1873), P. sombreriana McIntosh, 1885, Polymniella aurantiaca Verrill, 1900, Scionides reticulata (Ehlers, 1887), Spinosphaera carrerai Londoño-Mesa, 2003, S. hutchingsae Londoño-Mesa, 2003, Terebella turgidula Ehlers, 1887, T. verrilli Holthe, 1986, Terebellobranchia mchughae Londoño-Mesa & CarreraParra, 2005, Streblosoma hartmanae Kritzler, 1971, S. polybranchia Verrill, 1900, Thelepus haitiensis Treadwell, 1931, and T. pascua (Fauchald, 1977). Two species are reinstated: Loimia bermudensis Verrill, 1900, and Thelepus crassibranchiatus Treadwell, 1901. One species is reinstated with a new combination: Eupolymnia magnifica (Webster, 1884). Five species names are new combinations: Pista cetrata (Ehlers, 1887), Pistella papillosa (Tourtellotte & Kritzler, 1988), Terebellobranchia hiata (Treadwell, 1931), Thelepus tenuis (Verrill, 1900), and T. verrilli (Treadwell, 1911). Finally, five species are regarded as distinct but remain undescribed because of the poor condition of the specimens: Amaeana sp. 1, Neoleprea sp. A Kritzler, 1984, Neoleprea sp. 1, Proclea sp. 1, and Thelepus sp. 1. All of the type and non-type material available for each species from the region is revised and compared with specimens of species previously regarded as junior synonyms of others species described from areas outsie of the region. A key to all species is provided.

scholarly journals Gene Sequencing and Phylogenetic Analysis: Powerful Tools for an Improved Diagnosis of Fish Mycobacteriosis Caused by Mycobacterium fortuitum Group Members

2021 ◽  
Vol 9 (4) ◽  
pp. 797
Author(s):  
Davide Mugetti ◽  
Mattia Tomasoni ◽  
Paolo Pastorino ◽  
Giuseppe Esposito ◽  
Vasco Menconi ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Gene Sequencing ◽  
Diagnostic Techniques ◽  
Individual Species ◽  
Identification System ◽  
Mycobacterium Fortuitum ◽  
Biochemical Tests ◽  
Species Determination ◽  
Gene Encoding ◽  
The Individual

The Mycobacterium fortuitum group (MFG) consists of about 15 species of fast-growing nontuberculous mycobacteria (NTM). These globally distributed microorganisms can cause diseases in humans and animals, especially fish. The increase in the number of species belonging to MFG and the diagnostic techniques panel do not allow to clarify their real clinical significance. In this study, biomolecular techniques were adopted for species determination of 130 isolates derived from fish initially identified through biochemical tests as NTM belonging to MFG. Specifically, gene sequencing and phylogenetic analysis were used based on a fragment of the gene encoding the 65 KDa heat shock protein (hsp65). The analyzes made it possible to confirm that all the isolates belong to MFG, allowing to identify the strains at species level. Phylogenetic analysis substantially confirmed what was obtained by gene sequencing, except for six strains; this is probably due to the sequences present in NCBI database. Although the methodology used cannot represent a univocal identification system, this study has allowed us to evaluate its effectiveness as regards the species of MFG. Future studies will be necessary to apply these methods with other gene fragments and to clarify the real pathogenic significance of the individual species of this group of microorganisms.

Taxonomic application of macro and micro morphological characters of seeds in Astragalus L. (Galegeae, Fabaceae) in India

Phytotaxa ◽  
2021 ◽  
Vol 502 (2) ◽  
pp. 191-207
Author(s):  
SHIVANI KASHYAP ◽  
CHANDAN KUMAR SAHU ◽  
ROHIT KUMAR VERMA ◽  
LAL BABU CHAUDHARY
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Seed Coat ◽  
Morphological Plasticity ◽  
Morphological Characters ◽  
Individual Species ◽  
Large Size ◽  
The Individual ◽  
Scanning Electron

Due to large size and enormous morphological plasticity, the taxonomy of the genus Astragalus is very complex and challenging. The identification and grouping of species chiefly based on macromorphological characters become sometimes difficult in the genus. In the present study, the micromorphology of the seeds of 30 species belonging to 14 sections of Astragalus from India has been examined applying scanning electron microscopy (SEM) along with light microscopy (LM) to evaluate their role in identification and classification. Attention was paid to colour, shape, size and surface of seeds. The overall size of the seeds ranges from 1.5–3.2 × 0.8–2.2 mm. The shape of the seeds is cordiform, deltoid, mitiform, orbicular, ovoid and reniform. The colour of seeds varies from brown to blackish-brown to black. Papillose, reticulate, ribbed, rugulate and stellate patterns were observed on the seed coat surface (spermoderm) among different species. The study reveals that the seed coat ornamentations have evolved differently among species and do not support the subgeneric and sectional divisions of the genus. However, they add an additional feature to the individual species, which may help in identification in combination with other macro-morphological features.

Larval and post-larval stages of fishes recorded from the plankton of Galway Bay, 1972–73

1976 ◽  
Vol 56 (1) ◽  
pp. 197-211 ◽  
Author(s):  
Julie M. Fives ◽  
F. I. O'Brien
Keyword(s):  
Copepod Species ◽  
Individual Species ◽  
Larval Stages ◽  
Percentage Occurrence ◽  
Bay Area ◽  
The Individual ◽  
Recorded Occurrence

The Galway Bay area was sampled quantitatively for plankton during 1972–3. The larvae and/or post-larvae of 67 species of fish were identified from the plankton. The recorded occurrence per m3 and the percentage occurrence of the individual species is presented and discussed, and reference is made to the concurrent occurrence of various chaetognath species and copepod species. The results of previous investigations of the plankton of the Galway Bay area are mentioned.

scholarly journals It Cuts Both Ways: An Annelid Model System for the Study of Regeneration in the Laboratory and in the Classroom

2021 ◽  
Vol 9 ◽  
Author(s):  
Veronica G. Martinez Acosta ◽  
Fausto Arellano-Carbajal ◽  
Kathy Gillen ◽  
Kay A. Tweeten ◽  
Eduardo E. Zattara
Keyword(s):  
Wound Healing ◽  
Developmental Process ◽  
Recovery Of Function ◽  
Single Species ◽  
Model System ◽  
Regenerative Capacity ◽  
Closely Related Species ◽  
Complete Replacement ◽  
Successful Recovery ◽  
The Individual

The mechanisms supporting regeneration and successful recovery of function have fascinated scientists and the general public for quite some time, with the earliest description of regeneration occurring in the 8th century BC through the Greek mythological story of Prometheus. While most animals demonstrate the capacity for wound-healing, the ability to initiate a developmental process that leads to a partial or complete replacement of a lost structure varies widely among animal taxa. Variation also occurs within single species based on the nature and location of the wound and the developmental stage or age of the individual. Comparative studies of cellular and molecular changes that occur both during, and following, wound healing may point to conserved genomic pathways among animals of different regenerative capacity. Such insights could revolutionize studies within the field of regenerative medicine. In this review, we focus on several closely related species of Lumbriculus (Clitellata: Lumbriculidae), as we present a case for revisiting the use of an annelid model system for the study of regeneration. We hope that this review will provide a primer to Lumbriculus biology not only for regeneration researchers but also for STEM teachers and their students.

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