منابع مشابه
Fiddler crabs
What are fiddler crabs? Fiddler crabs belong to the genus Uca. They are members of the ocypodid family of brachyuran crabs, the most recent marine animals to have invaded land. They spend the first part of their life as aquatic plankton and only settle in the intertidal zone after their last larval moult. Adults live in burrows on intertidal mudand sand-flats within dense, mixedage, mixed-sex a...
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Researchers had been divided over whether the sound was vocal or not, but the latest study, published online in the Royal Society Proceedings B shows unequivocally that the tail feathers were the source of the sound. When the researchers cut back the tail feathers — which grow back in five weeks and do not affect the birds ability to fly — the males were unable to make the noise. Tests in wind ...
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Spermiogenesis in Cancer crabs was studied by light and electron microscopy. The sperm are aflagellate, and when mature consist primarily of a spherical acrosome surrounded by the nucleus with its short radiating arms. The acrosome forms by a coalescence of periodic acid-Schiff-positive (PAS-positive) vesicles. During spermiogenesis one edge of the acrosomal vesicle invaginates to form a PAS-ne...
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Limulus has been a superb animal model for understanding vision in higher animals, including man. Nobel-prize winning research on the lateral eye of Limulus by H. K. Hartline revealed fundamental principles of retinal function applicable to all eyes. The function of the Limulus lateral eye is now well understood as is its essential role in the animal’s mating behavior.
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Brachyuran crabs are one of the most diverse taxa of crustaceans, occurring in almost all coastal habitats. Due to their high morphological diversification, the authors sought to ascertain the existence of morphological patterns related to the habitat of coastal brachyuran crabs. We analyzed 17 species from mangrove forests, rocky shores, sandy beaches and exclusively aquatic marine/estuarine e...
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ژورنال
عنوان ژورنال: Nature
سال: 1897
ISSN: 0028-0836,1476-4687
DOI: 10.1038/055224b0