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Neurogenesis in larval stages of the spider crab Hyas araneus (Decapoda, Brachyura): proliferation of neuroblasts in the ventral nerve cord

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Abstract

Larvae of the spider crab Hyas araneus were reared in the laboratory from hatching through to metamorphosis. Neurogenesis was recorded in the ventral nerve cord during development of successive larval stages, zoea 1, zoea 2, megalopa and crab 1. Proliferating cells were detected immunocytochemically after in vivo labelling with 5-bromo-2′-deoxyuridine (BrdU) which, as a thymidine analogue, is incorporated into the DNA of dividing cells. Segmental sets of mitotically highly active neuroblasts were found in newly hatched larvae. A dorsal neuroblast, a ventral-median neuroblast, 3–6 anterior-ventral neuroblasts and 1–3 lateral neuroblasts could be distinguished in each thoracic ganglion. Significantly fewer neuroblasts were labelled in the suboesophageal ganglion as compared to the thoracic ganglia. The number of active labelled neuroblasts was high throughout zoea 1 and about 30% of zoea 2 development and then dramatically decreased towards premetamorphosis. In the newly moulted megalopa, only a reduced set of neuroblasts was labelled which ceased dividing within the first few days of megalopa development. There is an indication that, although most ganglion mother cells born by unequal division of neuroblasts may go through their final division at an early stage, certain clusters of ganglion mother cells obviously delay their final mitosis. These results are discussed with regard to neuronal integration which necessarily changes during the course of metamorphosis in relation to the altered behavioural repertoire of the larvae.

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Harzsch, S., Dawirs, R.R. Neurogenesis in larval stages of the spider crab Hyas araneus (Decapoda, Brachyura): proliferation of neuroblasts in the ventral nerve cord. Roux's Arch Dev Biol 204, 93–100 (1994). https://doi.org/10.1007/BF00361103

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