Monoamine-derived neurotransmitters first appeared early in bilateral invertebrate evolutionary history

the verdict

SUPPORTED

the evidence backs this

Recorded sources

3 sources for · 0 against

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Evidence across diverse invertebrate lineages, such as annelids, molluscs, and flatworms, demonstrates that monoamine neurotransmitter systems are deeply conserved and emerged early in bilateral evolutionary history.

The analysis

The retrieved papers document the presence of conserved monoaminergic signaling and neuroendocrine components across major invertebrate groups (e.g., annelids, bivalves, flatworms), supporting the claim that these neurotransmitters appeared early in bilateral invertebrate evolution.

Evidence for · 3

The Nereid on the rise: Platynereis as a model system.

Recorded source metadata

Özpolat BD, Randel N, Williams EA, Bezares-Calderón LA, Andreatta G, Balavoine G, Bertucci PY, Ferrier DEK, Gambi MC, Gazave E, Handberg-Thorsager M, Hardege J, Hird C, Hsieh YW, Hui J, Mutemi KN, Schneider SQ, Simakov O, Vergara HM, Vervoort M, Jékely G, Tessmar-Raible K, Raible F, Arendt D. The Nereid on the rise: Platynereis as a model system.. 2021. https://doi.org/10.1186/s13227-021-00180-3

Platynereis studies demonstrate the presence of conserved neurobiological systems and rope-ladder central nervous systems in marine annelids.

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More for · 2

Physiological Roles of Serotonin in Bivalves: Possible Interference by Environmental Chemicals Resulting in Neuroendocrine Disruption.

Recorded source metadata

Canesi L, Miglioli A, Balbi T, Fabbri E. Physiological Roles of Serotonin in Bivalves: Possible Interference by Environmental Chemicals Resulting in Neuroendocrine Disruption.. 2022. https://doi.org/10.3389/fendo.2022.792589

Bivalve molluscs utilize monoamines like serotonin (5-HT) for fundamental physiological and neuroendocrine roles, highlighting an ancient invertebrate origin.

Source citation format

Planarian nociception: Lessons from a scrunching flatworm.

Recorded source metadata

Reho G, Lelièvre V, Cadiou H. Planarian nociception: Lessons from a scrunching flatworm.. 2022. https://doi.org/10.3389/fnmol.2022.935918

Planarians (flatworms) share high neurochemical similarities with vertebrates, including conserved neurotransmitter ligands and receptors.

Source citation format

The paper trail · every fact has a biography

first checked01 Aug 2026

judged → SUPPORTED · 8601 Aug 2026

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