Neurogenesis in Larval Invertebrates

Neurogenesis in larval invertebrates underpins the formation of nervous systems that guide feeding, locomotion and sensory behaviours during early life stages. Across diverse phyla – molluscs, annelids, nemerteans and others – a conserved sequence of events unfolds. An initial cohort of peripheral sensory cells emerges at the anterior and sometimes posterior poles of the embryo, often forming an apical organ that integrates environmental cues. These pioneer neurons extend axons that act as scaffolds, directing later-arriving neurites and establishing longitudinal nerve cords. As larvae progress through trochophore, veliger or analogous forms, ganglionic condensations develop along these cords, giving rise to cerebral, pedal and visceral centres. Neurotransmitter-specific populations, most notably serotonergic and FMRFamidergic cells, appear in characteristic domains and scaffold the formation of more complex circuits. During metamorphosis, some larval‐specific neurons are lost while others remodel to contribute to the juvenile or adult nervous system. This interplay between transient and persistent elements has profound implications for understanding nervous system evolution. Insights into larval neurogenesis also inform aquaculture practices, the assessment of environmental stressors on marine life and the design of bioinspired neural networks.

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Neurogenesis in Larval Invertebrates publication trend

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Technical terms

Apical organ: A cluster of flask-shaped and other sensory neurons at the anterior pole of a larva that detects environmental cues and initiates neurogenic signalling.
Pioneer neurons: Early-born cells that extend initial axonal tracts, guiding the growth of subsequent neurons and shaping the layout of nerve cords.
Veliger: A larval stage in molluscs characterised by a ciliated swimming organ (velum) and early formation of ganglionic condensations.
Trochophore: A planktonic larval form found in many lophotrochozoans, bearing ciliary bands for locomotion and feeding.
Ganglion: A localized cluster of neuronal cell bodies that functions as a coordination centre within the nervous system.

References

1. Comparative Neuroanatomy of Pediveliger Larvae of Various Bivalves from the Sea of Japan. Biology (2023).
2. Neurons with larval synaptic targets pioneer the later nervous system in the annelid Malacoceros fuliginosus. Frontiers in Neuroscience (2025).
3. Peripheral sensory neurons govern development of the nervous system in bivalve larvae. EvoDevo (2019).