Results 141 to 150 of about 1,184 (166)

Form Alternation of the Gonopod and Chela from Breeding to Non-breeding Season in Males of the Crayfish Cambaroides dauricus (Decapoda: Cambaroididae). [PDF]

Zool Stud
Alda.
europepmc   +1 more source

Freshwater Crayfishes (Astacoidea)

, 1997
Crayfishes 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.
Ray Ingle
exaly   +3 more sources

Appeasement Displays in Cambarid Crayfish (Decapoda, Astacoidea)

, 1979
Christopher Ameyaw‐Akumfi
exaly   +3 more sources

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Global Diversity and Conservation of Freshwater Crayfish (Crustacea: Decapoda: Astacoidea)

2016
The 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 ...
Keith A Crandall
exaly   +2 more sources

Remains of decapod crustaceans from the late Cenomanian and early Turonian of the Czech Republic mistakenly assigned to crayfishes (Astacoidea)

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.
Martina Kočová Veselská, Tadashi Kawai, Denis Audo   +2 more
openalex   +3 more sources

Gastrolith Growth During Proecdysis in the Crayfish, Faxonella Clypeata (Hay, 1899) (Decapoda, Astacoidea)

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, Carl J. Mohrherr, Dana C. Reinschmidt, Milton Fingerman   +3 more
openalex   +2 more sources

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 ...
Martha R. Pippitt
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Localisation of crustacean hyperglycemic hormone in late embryonic and first larval stage ofNephrops norvegicus(Astacoidea, Nephropidae)

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.
Piero Giulio Giulianini, Richard P. Smullen, Matthew G. Bentley, Enrico Ferrero   +3 more
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The phylogeny of the parastacidae (Crustacea : Astacoidea), and description of a new genus of Australian freshwater crayfishes

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.
E. F. Riek
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Ultrastructure of spermatozoa from three genera of crayfish Orconectes, Procambarus and Astacus (Decapoda: Astacoidea): New findings and comparisons

Zoologischer Anzeiger - A Journal of Comparative Zoology, 2012
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, Antonín Kouba, Martin Pšenička, Iryna Kuklina, Pavel Kozák   +4 more
openalex   +2 more sources