Possibility of Undeveloped Egg Absorption during Embryogenesis: A Unique Phenomenon Observed in the Ovoviviparous Mayfly Cloeon dipterum

2020 ◽  
Vol 38 (1) ◽  
Author(s):  
Koki Yano ◽  
Koji Tojo
Keyword(s):  
Cloeon Dipterum

What is Cloeon dipterum (Linnaeus, 1761)?

1975 ◽  
Vol 6 (3-4) ◽  
pp. 215-223 ◽  
Author(s):  
Ryszard Sowa
Keyword(s):  
Type Specimens ◽  
Southern Poland ◽  
European Literature ◽  
Cloeon Dipterum ◽  
Comparative Description

AbstractA comparative description of imagines, subimagines, and nymphs of Cloeon dipterum (L.) s.r., C. cognatum Stephens stat. nov., and C. inscriptum Bengtsson stat. nov. is given on the basis of reared material from southern Poland. The recognized and probable synonyms of these species are discussed on the basis of the data from European literature. Remarks about the material from other parts of Europe and about the type specimens of the three species are also given.

Adaptations and Resistance to Anoxia in Cloeon dipterum (Ephemeroptera) and Nemoura cinerea (Plecoptera)

Oikos ◽  
1978 ◽  
Vol 30 (1) ◽  
pp. 95 ◽  
Author(s):  
Björn Nagell ◽  
Torbjörn Fagerström ◽  
Bjorn Nagell ◽  
Torbjorn Fagerstrom
Keyword(s):  
Cloeon Dipterum

scholarly journals The Function of the Gills of Mayfly Nymphs from Different Habitats

1939 ◽  
Vol 16 (3) ◽  
pp. 363-373 ◽  
Author(s):  
C. A. WINGFIELD
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Content ◽  
The Body ◽  
Gaseous Exchange ◽  
Low Oxygen ◽  
Respiratory Mechanism ◽  
Tracheal Gills ◽  
Cloeon Dipterum ◽  
Gill Function ◽  
Oxygen Concentrations

1. The oxygen consumption of normal and gill-less nymphs of the mayflies Baetis sp., Cloeon dipterum and Ephemera vulgata has been measured at various oxygen concentrations. 2. It has been found that over the complete range of oxygen concentrations studied, the tracheal gills do not aid oxygen consumption in Baetis sp. In Cloeon dipterum, at all oxygen concentrations tested, no gaseous exchange takes place through the gills; at low oxygen concentrations, however, the gills function as an accessory respiratory mechanism in ventilating the respiratory surface of the body and so aid oxygen consumption. In Ephemera Vulgata the gills aid oxygen consumption even at high oxygen concentrations. In this species the gills may function both as true respiratory organs and as a ventilating mechanism. 3. It is shown that the differences in gill function can be related to the oxygen content of the habitat of each species.

scholarly journals Regulation of metamorphosis in neopteran insects is conserved in the paleopteran Cloeon dipterum (Ephemeroptera)

2021 ◽  
Vol 118 (34) ◽  
pp. e2105272118 ◽  
Author(s):  
Orathai Kamsoi ◽  
Alba Ventos-Alfonso ◽  
Fernando Casares ◽  
Isabel Almudi ◽  
Xavier Belles
Keyword(s):  
Juvenile Hormone ◽  
Molecular Analysis ◽  
Nymphal Instar ◽  
Morphological Studies ◽  
Flying Insects ◽  
Juvenile Hormone Analog ◽  
Hormone Analog ◽  
Two Stages ◽  
Cloeon Dipterum ◽  
Hormonal Treatments

In the Paleozoic era, more than 400 Ma, a number of insect groups continued molting after forming functional wings. Today, however, flying insects stop molting after metamorphosis when they become fully winged. The only exception is the mayflies (Paleoptera, Ephemeroptera), which molt in the subimago, a flying stage between the nymph and the adult. However, the identity and homology of the subimago still is underexplored. Debate remains regarding whether this stage represents a modified nymph, an adult, or a pupa like that of butterflies. Another relevant question is why mayflies have the subimago stage despite the risk of molting fragile membranous wings. These questions have intrigued numerous authors, but nonetheless, clear answers have not yet been found. By combining morphological studies, hormonal treatments, and molecular analysis in the mayfly Cloeon dipterum, we found answers to these old questions. We observed that treatment with a juvenile hormone analog in the last nymphal instar stimulated the expression of the Kr-h1 gene and reduced that of E93, which suppress and trigger metamorphosis, respectively. The regulation of metamorphosis thus follows the MEKRE93 pathway, as in neopteran insects. Moreover, the treatment prevented the formation of the subimago. These findings suggest that the subimago must be considered an instar of the adult mayfly. We also observed that the forelegs dramatically grow between the last nymphal instar, the subimago, and the adult. This necessary growth spread over the last two stages could explain, at least in part, the adaptive sense of the subimago.

A stressful shortness of breath: molting disrupts breathing in the mayfly Cloeon dipterum

2014 ◽  
Vol 33 (3) ◽  
pp. 695-699 ◽  
Author(s):  
A. A. Camp ◽  
D. H. Funk ◽  
D. B. Buchwalter
Keyword(s):  
Shortness Of Breath ◽  
Cloeon Dipterum

The spermatodesm of Cloeon dipterum (L.): Fine structure and sperm movement

2011 ◽  
Vol 43 (3) ◽  
pp. 157-164 ◽  
Author(s):  
Pietro Lupetti ◽  
Caterina Mencarelli ◽  
David Mercati ◽  
Elda Gaino ◽  
Romano Dallai
Keyword(s):  
Fine Structure ◽  
Cloeon Dipterum ◽  
Sperm Movement

scholarly journals Littoral mayfly assemblages in South-East European man-made lakes

2019 ◽  
Vol 78 (1) ◽  
Author(s):  
Marina Vilenica ◽  
Natalija Vučković ◽  
Zlatko Mihaljević
Keyword(s):  
Flood Control ◽  
Sampling Site ◽  
Oxygen Demand ◽  
First Record ◽  
Freshwater Ecosystems ◽  
East Europe ◽  
East European ◽  
South East Europe ◽  
Freshwater Habitats ◽  
Cloeon Dipterum

Man-made freshwater habitats have been widely used to successfully modify the environment for human benefit, including purposes of irrigation, flood control or electricity generation. Over the past decade, our knowledge about the mayfly fauna and its ecology in South-East Europe has been growing, yet the data related to lentic assemblages remain very scarce. In this study, littoral mayfly assemblages were investigated at artificial and heavily modified lentic habitats in the Dinaric Western Balkan (n=21) and Pannonian Lowland (n=15) ecoregions. Mayfly nymphs were sampled during the summer months of 2016 or 2017. At each sampling site, ten samples were collected using a benthos hand net. A total of 21 mayfly species were recorded, though species richness per site was rather low (i.e., between zero and seven species). Cloeon dipterum (Linnaeus, 1761) was the most frequent species recorded, while Caenis horaria Linnaeus, 1758 was the most abundant. This study showed that the Croatian mayfly fauna is still growing, with the first record of Siphlonurus aestivalis Eaton, 1903 for the country. The assemblage structure was mainly dominated by lower reaches and lentic (potamal and littoral) elements and detritivores (gatherers/collectors and active filter feeders). Orthophosphates and chemical oxygen demand had the highest influence on mayfly assemblages, reflecting a higher level of pollution at sites in the Pannonian Lowland ecoregion, and consequently markedly lower mayfly abundances. As mayflies are widely used as bioindicators of freshwater ecosystems, detailed information about their assemblages in heavily modified and artificial habitats could contribute to future conservation activities of freshwater habitats and their communities. Additionally, these results could be applied in creating a monitoring system for artificial lakes according to the requirements of the European Water Framework Directive.

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