Results 131 to 140 of about 1,097 (149)
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Crustaceana, 1977
Die Hautungszyklen von normal ernahrten und von hungernden Faxonella clypeata wurden im Labor untersucht, um Wechselbeziehungen zwischen bestimmten, wahrend der Proecdysis ablaufenden Ereignissen (Ablosen der Epidermis von der alten Kutikula, Bildung von Gastrolithen, Borsten und neuer Kutikula) zu studieren. Das Stadium Do machte etwa 50-70% der Dauer
K. Ranga Rao +3 more
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Die Hautungszyklen von normal ernahrten und von hungernden Faxonella clypeata wurden im Labor untersucht, um Wechselbeziehungen zwischen bestimmten, wahrend der Proecdysis ablaufenden Ereignissen (Ablosen der Epidermis von der alten Kutikula, Bildung von Gastrolithen, Borsten und neuer Kutikula) zu studieren. Das Stadium Do machte etwa 50-70% der Dauer
K. Ranga Rao +3 more
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Global Diversity and Conservation of Freshwater Crayfish (Crustacea: Decapoda: Astacoidea)
2016The number of species in the three families of freshwater crayfish worldwide (Astacidae, Cambaridae, and Parastacidae) are updated by region. These are: Astacidae, western North America (5 species) and Europe (5 species), Cambaridae, eastern North America and Mexico (423 species) and Asia (6 species), and Parastacidae, Oceania (153 species), South ...
Tadashi Kawai, Keith A. Crandall
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Journal of Crustacean Biology, 2023
Abstract Two species of fossil crustaceans from the Czech Republic are assigned to AstacusFabricius, 1775, a European crayfish: A. laevissimusFritsch & Kafka, 1887 and A. cenomanensisFritsch & Kafka, 1887. Both come from marine sediments, making doubtful their assignment to crayfishes.
Kočová Veselská, Martina +2 more
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Abstract Two species of fossil crustaceans from the Czech Republic are assigned to AstacusFabricius, 1775, a European crayfish: A. laevissimusFritsch & Kafka, 1887 and A. cenomanensisFritsch & Kafka, 1887. Both come from marine sediments, making doubtful their assignment to crayfishes.
Kočová Veselská, Martina +2 more
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Zootaxa, 2020
The use of color photographs in crayfish species descriptions, state faunal books and popular articles is relatively recent. Except for verbal color descriptions, color and color patterns have not often been explored by crayfish researchers. Carotenoids and carotenoproteins are responsible for much of the color found in the integument and exoskeleton ...
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The use of color photographs in crayfish species descriptions, state faunal books and popular articles is relatively recent. Except for verbal color descriptions, color and color patterns have not often been explored by crayfish researchers. Carotenoids and carotenoproteins are responsible for much of the color found in the integument and exoskeleton ...
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Mating Behavior of the Crayfish Orconectes Nais (Faxon, 1885) (Decapoda, Astacoidea)
Crustaceana, 1977[La conduite d'appariement des Orconectes nais etait la meme que celle d'autres especes d'ecrevisses sauf l'approche du mâle a la femelle et les manoeuvres du mâle pour mettre la femelle dans une position renversee. Sa conduite d'approche consistait en tendant les seconde et troisieme paires de pereiopodes pour prendre la femelle et la manipuler dans ...
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Zoologischer Anzeiger - A Journal of Comparative Zoology, 2013
Abstract Ultrastructure of spermatozoa of three crayfish genera including Orconectes limosus (Rafinesque, 1817), Procambarus clarkii (Girard, 1852), and Astacus leptodactylus (Eschscholtz, 1823) was studied using transmission electron microscopy. The length of the acrosome was significantly greater in A .
Hamid Niksirat +4 more
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Abstract Ultrastructure of spermatozoa of three crayfish genera including Orconectes limosus (Rafinesque, 1817), Procambarus clarkii (Girard, 1852), and Astacus leptodactylus (Eschscholtz, 1823) was studied using transmission electron microscopy. The length of the acrosome was significantly greater in A .
Hamid Niksirat +4 more
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Italian Journal of Zoology, 2000
Abstract We report here on immunohistochemical studies of embryos of the Norway lobster Nephrops norvegicus at 90% development, the stage being assessed according to eye index. The sinus gland was readily identified as a teardrop shaped structure about 45 μm in length in 90% embryos and as an oval structure about 50 μm in length in post‐hatched larvae.
Giulianini PG +3 more
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Abstract We report here on immunohistochemical studies of embryos of the Norway lobster Nephrops norvegicus at 90% development, the stage being assessed according to eye index. The sinus gland was readily identified as a teardrop shaped structure about 45 μm in length in 90% embryos and as an oval structure about 50 μm in length in post‐hatched larvae.
Giulianini PG +3 more
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Das Thoracoabdominalgelenk der Flußkrebse (Decapoda, Astacoidea)
1985(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Freshwater Crayfishes (Astacoidea)
1997Crayfishes inhabiting the northern hemisphere and discussed below belong to the superfamily Astacoidea. Species of this superfamily have the first and second pairs of pleopods present. The first pair of the female may be quite small, but for the male these , and the second pair, are modified as sperm transference organs [gonopods, figs.
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Australian Journal of Zoology, 1972
The development of the cephalothoracic grooves, orientation of the chelae in life (correlated with burrowing), and modifications of the sexual characters of the males are the main attributes utilized in deducing the probable phylogeny of the Parastacidae.
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The development of the cephalothoracic grooves, orientation of the chelae in life (correlated with burrowing), and modifications of the sexual characters of the males are the main attributes utilized in deducing the probable phylogeny of the Parastacidae.
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