Distinctive morphological features, life-cycle phases and seasonal variations in subtropical populations of Dictyota dichotoma (Dictyotales, Phaeophyceae)

2008 ◽  
Vol 51 (2) ◽  
Author(s):  
Ana Tronholm ◽  
Marta Sansón ◽  
Julio Afonso-Carrillo ◽  
Olivier De Clerck
Keyword(s):  
Life Cycle ◽  
Seasonal Variations ◽  
Morphological Features ◽  
Dictyota Dichotoma

Spatial and seasonal variations of the chemical, mineralogical and morphological features of quasi-ultrafine particles (PM0.49) at urban sites

2016 ◽  
Vol 553 ◽  
pp. 392-403 ◽  
Author(s):  
Constantini Samara ◽  
Nikolaos Kantiranis ◽  
Panagiotis Kollias ◽  
Styliani Planou ◽  
Athanasios Kouras ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Ultrafine Particles ◽  
Morphological Features ◽  
Urban Sites

scholarly journals The morphology of the immature stages of Squamapion atomarium (Kirby, 1808) (Coleoptera, Brentidae) and notes on its life cycle

ZooKeys ◽  
2019 ◽  
Vol 892 ◽  
pp. 103-120
Author(s):  
Krzysztof Pawlęga ◽  
Jacek Łętowski ◽  
Ewelina Szwaj ◽  
Tomasz Gosławski
Keyword(s):  
Life Cycle ◽  
Body Size ◽  
Developmental Stages ◽  
Morphological Features ◽  
Morphological Data ◽  
Immature Stages ◽  
Head Shape ◽  
Mature Larva ◽  
Development Cycle ◽  
First Time

The immature stages (egg, mature larva and pupa) of Squamapion atomarium (Kirby, 1808), as well as its development cycle and the phenology of its developmental stages, are described for the first time. The larva and pupa of S. atomarium have typical morphological features of the subfamily Apioninae. Morphological data on the immature stages were compared with the only fully described Squamapion species, S. elongatum (Germar, 1817). The larvae of the two species differ in body size and shape, head shape, setae length, the chaetotaxy of the mouthparts, and individual types of setae on the pronotum and thorax. In the case of the pupa, there are also differences in body size and in the type of setae and chaetotaxy of the head, pronotum, metanotum and abdomen.

Control of African Swine Fever and Avian Spirochaetosis

2021 ◽  
pp. 329-353
Author(s):  
Charles Muleke Inyagwa ◽  
Erick O. Mungube
Keyword(s):  
Life Cycle ◽  
Clinical Signs ◽  
African Swine Fever ◽  
Economic Importance ◽  
Morphological Features ◽  
Historical Background ◽  
Direct Damage ◽  
Animal Pathogens ◽  
The Family ◽  
Veterinary Importance

Ticks are distributed worldwide and have an enormous medical and veterinary importance owing to the direct damage they cause and indirectly as vectors of a large variety of human and animal pathogens. The family Argasidae (soft ticks) comprises five genera and with about 193 species. Among all the argasid ticks, only four Argas and two Ornithodoros species are competent to transmit diseases. This chapter describes the various ticks of the argasidae family, diseases they transmit, and strategies for their control. A description of the two important genera, Ornithodorus and Argas, that belong to the family argasidae are provided. Emphasis is on the mammalian hosts affected, tick species involved, morphological features (with relevant pictorials), geographic distribution, life cycle, and economic importance. A detailed description of the two most important diseases transmitted by argasidae ticks namely African swine fever (ASF) and avian spirochaetosis is given. Emphasis is laid on the historical background, epidemiology, clinical signs, and strategies for their control.

scholarly journals LARVAL STAGES OF PHYLLODISTOMUM SP. (DIGENEA, GORGODERIDAE) FROM THE DUCK MUSSELS ANODONTA ANATINA IN UKRAINE

2013 ◽  
Vol 47 (6) ◽  
pp. 37-42 ◽  
Author(s):  
O. S. Kudlai ◽  
L. N. Yanovich
Keyword(s):  
Life Cycle ◽  
Ventral Sucker ◽  
Experimental Infection ◽  
Definitive Host ◽  
Morphological Features ◽  
Carassius Carassius ◽  
Body Proportions ◽  
Intermediate Hosts ◽  
Free Swimming ◽  
Larval Stages

Abstract Rhopalocercous cercariae were found in the gonads of duck mussels, Anodonta anatina (Linnaeus, 1758) collected from the Sluch River (Zhytomyr oblast, Ukraine). The morphological features observed led to conclusion that this species belonged to the genus Phyllodistomum Braun, 1899. Obtained results suggested that the second intermediate hosts in the life cycle of this trematode were absent. Free-swimming cercariae were observed encysting in water. This species is similar to Phyllodistomum pseudofolium Nybelin, 1926 by overall body proportions and ratio of suckers: lengths of oral to ventral sucker 1 : 1.1; widths of the same organs 1 : 1.2. To confirm the taxonomic position of the species found and establish a possible relationship between it and P. pseudofolium an experimental infection of fish Carassius carassius (Linnaeus, 1758) as potential definitive host was performed. The infection was not successful. Descriptions and figures of all detected larval stages of Phyllodistomum sp. are provided.

scholarly journals Quiet time F2-layer disturbances: seasonal variations of the occurrence in the daytime sector

2009 ◽  
Vol 27 (1) ◽  
pp. 329-337 ◽  
Author(s):  
A. V. Mikhailov ◽  
A. H. Depueva ◽  
V. H. Depuev
Keyword(s):  
Seasonal Variations ◽  
Morphological Features ◽  
Basic Process ◽  
Quiet Time ◽  
Winter Solstice ◽  
Summer Peak ◽  
Latitudinal Variations ◽  
The Impact

Abstract. Earlier revealed seasonal/latitudinal variations of the occurrence for positive and negative F2-layer Q-disturbances have been interpreted in the framework of the present-day concept of the thermosphere-ionosphere interaction. The basic process is the solar-driven and storm-induced thermospheric circulation's interaction which varies with season and latitude. Such morphological features as clustering of negative Q-disturbances around winter solstice and the appearance of an additional occurrence of summer peak at lower latitudes, the equinoctial occurrence peaks for positive Q-disturbances and their merging to one summer peak at lower latitudes can be explained in the framework of this concept. Moreover, seasonal/latitudinal variations of the occurrence for usual storm-induced F2-layer disturbances, which exhibit quite different morphology, are also explained within this concept and this may be considered as its success. Although some types of F2-layer Q-disturbances are obviously related to the impact from below, the analyzed seasonal/latitudinal occurrence variations are shown to have their origin in the thermosphere itself.

scholarly journals Description of the larva of Holocentropus insignis Martynov 1924 (Trichoptera: Polycentropodidae) with notes on biology and distribution

Zootaxa ◽  
2018 ◽  
Vol 4532 (2) ◽  
pp. 231
Author(s):  
HARRY BOONSTRA ◽  
AKI RINNE ◽  
MARTIN KUBIAK ◽  
PETER WIBERG-LARSEN
Keyword(s):  
Life Cycle ◽  
The Netherlands ◽  
Morphological Features ◽  
The Other ◽  
Larval Morphology

The hitherto undescribed larva of Holocentropus insignis Martynov 1924 was collected in Denmark, the Netherlands, and Finland. Based on larval morphology and DNA association with adults, we were able to distinguish the larva of H. insignis from other Holocentropus species known to occur in Europe and confirm its identification. We provide morphological features to separate H. insignis from the other known species within the genus and give an updated key to all known European larvae of Holocentropus. Extensive notes on the life cycle, biology, and distribution of H. insignis are given. 

THE LIFE CYCLE OF APANTELES CARPATUS (SAY) (HYMENOPTERA: BRACONIDAE), A PARASITE OF THE WEBBING CLOTHES MOTH, TINEOLA BISSELLIELLA HUM.

1942 ◽  
Vol 20d (1) ◽  
pp. 13-19 ◽  
Author(s):  
A. Murray Fallis
Keyword(s):  
Life Cycle ◽  
Constant Temperature ◽  
Average Length ◽  
Morphological Features ◽  
Fecal Pellets ◽  
Rate Of Development ◽  
Experimental Infections ◽  
Parasite Larva ◽  
Tineola Bisselliella

This parasite has been reared from larvae of the webbing clothes moth obtained from different localities as well as experimentally. All parasites obtained by natural and experimental infections were females. Oviposition occurred and parasites developed in host larvae weighing 1.6 to 6.8 mg. The parasites oviposited more readily in a host enclosed in a case, especially if the case contained fecal pellets of the host. Eggs were deposited in various parts of the host. A single parasite developed to maturity even though several eggs may have been deposited in the host, each by a separate "thrust" of the ovipositor. Morphological features of the larvae are illustrated. The rate of development varied even at constant temperature. The average length of the life cycle at 27 °C. was 26 days but at 20 °C. it required several months. Experiments were carried out to determine the factors responsible for the variation in the rate of development. The parasite larva, upon emerging from the host, usually spins a white, silken cocoon, although metamorphosis was sometimes completed even though no cocoon was produced.

Two New Species of Amoeba found in Cockroaches: with Notes on the Cysts of Nyctotherus ovalis Leidy

Parasitology ◽  
1927 ◽  
Vol 19 (2) ◽  
pp. 223-235 ◽  
Author(s):  
Catherine L. T. Lucas
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Morphological Features ◽  
Blatta Orientalis ◽  
Two New Species ◽  
The Common

During recent investigations on Endamoeba blattae (Bütschli) Leidy of the common cockroach, Blatta orientalis, there were observed in the hindgut of the host, two other distinct amoebic species. Both appear to be truly entozoic, but contrast strikingly with E. blattae both in morphological features and life cycle. They are interesting not only in being among the comparatively few species yet reported from insects, but also in their relationships to certain of the amoebae of vertebrates.

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