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From variable to constant cell numbers: cellular characteristics of the arthropod nervous system argue against a sister-group relationship of Chelicerata and "Myriapoda" but favour the Mandibulata ...
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From variable to constant cell numbers: cellular characteristics of the arthropod nervous system argue against a sister-group relationship of Chelicerata and "Myriapoda" but favour the Mandibulata ...
http://www.ncbi.nlm.nih.gov/pubmed/15592874
This review analyses the mechanisms of neurogenesis, the morphology of serotonergic interneurons, the number of motoneurons, and cellular features and development of the lateral eyes of Chelicerata.
Biology > Biota > Fauna > Arthropoda > Chelicerata
animals arthropods brain evolution eye neurons phylogeny serotonin
Jan 1, 2005
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Other links at Biology > Biota > Fauna > Arthropoda > Chelicerata
The authors investigated sperm dimorphism as a rare phenomenon in Chelicerata.
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very reduced abdomen - typically have 1 pair chelicerae (3-segmented), 1 pair ovigers, 4 pair walking legs, and simple eyes - unusual reproductive biology: males brood embryos on special legs (ovigers); only arthropod group with sole male parental care!
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The authors state that arthropods have the capacity of recognizing self from non-self in various defense phenomena including hemolymph clotting, phagocytosis, encapsulation, melanization and clearance of the foreign matter which must be initiated by a first step of molecular recognition.
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Fossils on display, Geological Museum, University of Oslo, Norway: Chelicerata showcase
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The 75000 species within this subphylum belong to three diverse classes. The Classes Merostomata and Pycnogonida include relatively minor, aquatic organisms, the Class Arachnida comprises the vast majority of species (74000 + ) and includes spiders, scorpions, mites and ticks.
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Cheli. 1 i Subphylum CHELICERATA i Questo subphylum dartropodi i fa parte dei Merostomata i, oggi rappresen- tati da soli tre generi, che vivono in ambienti marini marginali.
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ANIMAL BYTES - Chelicerata...Find quick information and fun facts about animals.
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The Cheliceramorpha includes spiders and scorpions, mites and ticks, horseshoe crabs, daddy-longlegs, and extinct "sea-scorpions".
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Comment Citation: Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed June 07, 2007 at http://animaldiversity.org.
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