Agelenids of the World

Systematics and Taxonomy of Agelenidae, a Worldwide distributed Spider Family

Common general morphological pattern of peptidergic neurons in the arachnid brain: crustacean cardioactive peptide-immunoreactive neurons in the protocerebrum of seven arachnid species

Publication Type:Journal Article
Year of Publication:1995
Authors:O. Breidbach, Dircksen, H., Wegerhoff, R.
Journal:Cell & Tissue Research
Date Published:1995
ISBN Number:0302-766X
Keywords:[Brain / / Protocerebrum, Arachnida (Arthropoda)., Arachnida [Brain / / Protocerebrum, Araneus diadematus, Araneus diadematus (Araneae)., Brachypelma albopilosa, Brachypelma albopilosa (Araneae)., Cupiennius salei, Cupiennius salei (Araneae)., distribution, distribution pattern]., Meta, Meta segmentata (Araneae)., Nephila clavipes, Nephila clavipes (Araneae)., Nervous system, pattern] [Neurons / / Peptidergic neurons in protocerebrum]., peptidergic neurons, Rilaena triangularis, Rilaena triangularis (Opiliones)., segmentata, Tegenaria atrica, Tegenaria atrica (Araneae).

A polyclonal antiserum raised against crustacean cardioactive peptide labels 14 clusters of immunoreactive neurons in the protocerebrum of the spiders Tegenaria atrica and Nephila clavipes, and the harvestman (opilionid) Rilaena triangularis. In all species, these clusters possess the same number of neurons, and share similar structural and topological characteristics. Two sets of bilateral symmetrical neurons associated with the optic lobes and the arachnid "central body" were analysed in detail, comparing the harvestman R. triangularis and the spiders Brachypelma albopilosa (Theraphosidae), Cupiennius salei (Lycosidae), Tegenaria atrica (Agelenidae), Meta segmentata (Metidae) and Nephila clavipes (Araneidae). Sixteen neurons have been identified that display markedly similar axonal pathways and arborization patterns in all species. These neurons are considered homologues in the opilionid and the araneid brains. We presume that these putative phylogenetically persisting neurons represent part of the general morphological pattern of the arachnid brain.

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