Search results for "Systematic"
showing 10 items of 7608 documents
Understanding Mediterranean‐Californian disjunctions: molecular evidence from Chenopodiaceae‐Betoideae
2006
Chenopodiaceae subfam. Betoideae is distributed in both western Eurasia (four genera) and western North America (one genus). To understand the origin of this disjunction, the phylogeny of the subfamily was reconstructed and dated using ndhF, matK/trnK, tmL-trnF spacer, and ITS sequence variation, penalized likelihood and Langley-Fitch, and calibration with three different fossils. Maximum Parsimony and Maximum Likelihood analyses of the molecular data show that Betoideae are monophyletic, but that relationships of the Himalayan Acroglochin, traditionally included in Betoideae because of the shared possession of a circumscissile capsule, are uncertain. Among the betoidean genera, Beta (excl.…
Heteropodinae: Transfers and Synonymies (Arachnida: Araneae: Sparassidae)
2002
New taxonomical and systematical results concerning the subfamily Heteropodinae are presented. The following new synyonyms are recognized: Adrastis Simon 1880, Panaretus Simon 1880, Parhedrus Simon 1887 are junior synyonyms of Heteropoda Latreille 1804. Adrastis atomaria Simon 1880 =Heteropoda boiei (Doleschall 1859); Parhedrus fasciatus Reimoser 1927=Heteropoda ocyalina (Simon 1887); Heteropoda holzi Strand 1907, Tortula gloriosa Simon 1880, Tortula simoni Karsch 1884, Holconia beccarii Thorell 1890, Isopeda beccarii malangana Strand 1907=Heteropoda lunula (Doleschall 1857); Olios freycineti Walckenaer 1837, Olios albifrons Lucas 1852, Helicopis maderiana Thorell 1875, Palystes ledleyi Hog…
Taxonomic Revision of the Genus Trictenotoma Gray, 1832 (Coleoptera: Trictenotomidae). Part 2 – Species from Hainan and Taiwan
2020
Trictenotoma davidi Deyrolle, 1875 and T. formosanaKriesche, 1919 are the only insular Palaearctic Trictenotomidae. Both species are related and T. formosana was originally defined on the basis of unstable morphological features and originally described as a subspecies of T. davidi. In this paper, a detailed redescription of T. formosana is provided, male and female genital organs are described and illustrated for the first time and the lectotype is designated. Hainan (China) records of T. davidi are presented and morphological variability of this taxon is discussed. The first observation of Trictenotomidae mating behaviour is briefly described.
Crab spiders of the families Thomisidae and Philodromidae (Arachnida: Araneae) from Iran
2004
Spiders of the families Thomisidae and Philodromidae (Arachnida, Araneae) mainly collected in the mountainous areas of Iran in 1978 are taxonomically studied and classified into 21 species of 10 genera. Most species are illustrated and described on the basis of the present specimens. Except for only two species, Xysticus kulczynskii Wierzbicki 1902 and Synaema globosum (Fabricius 1775), already known from this country, 19 species are new records to the Iranian fauna. Of these, 14 species, Tmarus stellio Simon 1875, Xysticus ninnii Thorell 1872 (subsp. fusciventris Crome 1965), X. cristatus (Clerck 1758), X. kochi Thorell 1872, X. gallicus Simon 1875, Oxyptila nigrita Thorell 1875, Heriaeus …
Revisional Notes on Trictenotoma Gray, 1832 (Coleoptera: Trictenotomidae) in Indochina Bioregion, with Description of a New Species
2020
A review and species key to TrictenotomaGray, 1832 (Trictenotomidae Blanchard, 1845) from the Indochina bioregion, mainland Southeast Asia, is presented for the first time. Adults of Trictenotoma childreniGray, 1832, T. davidi Deyrolle, 1875 and T. mouhoti Deyrolle, 1875 are redescribed. Trictenotoma pollockisp. nov. from southern Vietnam is described and illustrated. A lectotype is designated for T. mouhoti Deyrolle, 1875.
BOTH MALE AND FEMALE SEXUAL ORNAMENTS REFLECT OFFSPRING PERFORMANCE IN A FISH
2010
Secondary sexual characters are often expressed in both sexes (mutual ornamentation), but are less often studied simultaneously. We studied the adaptive signaling function of male and female ornamentation in a mutually ornamented fish, the whitefish Coregonus lavaretus. In an experimental design in which nongenetic environmental effects were minimized, we found that highly ornamented females, males, and their parental combinations had offspring with better swimming performance and predator-avoidance ability than less ornamented individuals or combinations. Furthermore, highly ornamented females had larger offspring that also had higher yolk volume than less ornamented individuals. Offspring…
Muscular Strength Imbalances Are not Associated with Skin Temperature Asymmetries in Soccer Players
2020
Although strength imbalances using isokinetic dynamometer have been examined for injury risk screening in soccer players, it is very expensive and time-consuming, making the evaluation of new methods appealing. The aim of the study was to analyze the agreement between muscular strength imbalances and skin temperature bilateral asymmetries as well as skin temperature differences in the hamstrings and quadriceps. The skin temperature of the anterior and posterior thigh of 59 healthy male soccer athletes was assessed at baseline using infrared thermography for the identification of hamstrings-quadriceps skin temperature differences and thermal asymmetries (>
Effects of anthropogenic stress on hosts and their microbiomes: Treated wastewater alters performance and gut microbiome of a key detritivore ( Asell…
2023
Human activity is a major driver of ecological and evolutionary change in wild populations and can have diverse effects on eukaryotic organisms as well as on environmental and host-associated microbial communities. Although host-microbiome interactions can be a major determinant of host fitness, few studies consider the joint responses of hosts and their microbiomes to anthropogenic changes. In freshwater ecosystems, wastewater is a widespread anthropogenic stressor that represents a multifarious environmental perturbation. Here, we experimentally tested the impact of treated wastewater on a keystone host (the freshwater isopod Asellus aquaticus) and its gut microbiome. We used a semi-natur…
Temporal genetic structure in a poecilogonous polychaete: the interplay of developmental mode and environmental stochasticity
2014
Background: Temporal variation in the genetic structure of populations can be caused by multiple factors, including natural selection, stochastic environmental variation, migration, or genetic drift. In benthic marine species, the developmental mode of larvae may indicate a possibility for temporal genetic variation: species with dispersive planktonic larvae are expected to be more likely to show temporal genetic variation than species with benthic or brooded non-dispersive larvae, due to differences in larval mortality and dispersal ability. We examined temporal genetic structure in populations of Pygospio elegans, a poecilogonous polychaete with within-species variation in developmental m…
Spatial and temporal pattern of neuroblasts, proliferation, and Engrailed expression during early brain development in Tenebrio molitor L. (Coleopter…
2003
Abstract In insects, the knowledge of embryonic brain development is still fragmentary, and comparative data are scarce. In this study, we explored aspects of embryonic brain development in the coleopteran Tenebrio molitor . A detailed description is provided of the spatial and temporal pattern of the embryonic brain neuroblasts during 18–60% of embryonic development. Approximately 125 brain NBs have been identified in each hemisphere of the brain at about 40% of embryonic development. A subset of five neuroblasts, among them the two progenitors of the mushroom bodies and two progenitors of the larval antennal lobe, are morphologically identifiable by their larger size. As revealed by incor…