Cross references: Amphioxus Neurotransmitters Amphioxus Dopamine
Dopamine Receptors Tyrosine Hydroxylase Dopaminergic Cell Groups
PubMed = 7 http://www.ncbi.nlm.nih.gov/pubmed/?term=amphioxus+dopamine
Google = 185,000 https://www.google.com/search?q=amphioxus+dopamine&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=np&source=hp
Characterisation of AmphiAmR11, an amphioxus (Branchiostoma floridae) D2-dopamine-like G protein-coupled receptor
Amphioxus expresses both vertebrate-type and invertebrate-type dopamine D(1) receptors.
Identification and characterization of a novel amphioxus dopamine D-like receptor
AmphiD1/beta, a dopamine D1/beta-adrenergic receptor from the amphioxus Branchiostoma floridae: evolutionary aspects of the catecholaminergic system during development.
See: Amphioxus Receptors .
Distribution of tyrosine hydroxylase, dopamine, and serotonin in the central nervous system of amphioxus (Branchiostoma lanceolatum): implications for the evolution of catecholamine systems in vertebrates.
Amphioxus Neurotransmitters .
"The overall distribution of dopaminergic and serotoninergic systems is similar in amphioxus and vertebrate central nervous system and could be an ancestral character of chordates."
Evolution of monoamine receptors and the origin of motivational and emotional systems in vertebrates
Google page 1:
All of the references had already been identified by PubMed, above.
Google page 2:
Three interesting references:
IMMUNOCYTOCHEMICAL LOCALIZATION OF DOPAMINE AND NOREPINEPHRINE IN THE NERVOUS SYSTEM AND GONADS OF AMPHIOXUS (BRANCHIOSTOMA BELCHERI)
British Library EThOS : Thesis Details - The identification and characterisation of aminergic G-protein coupled receptors from amphioxus
Evolution of Dopamine Receptor Genes of the D1 Class in Vertebrates
Google page 3:
Frontiers | The Evolution of Dopamine Systems in Chordates | Frontiers in Neuroanatomy
"The antero-dorsal population 1 is located close to photoreceptors, and it sends short projections ventrally to the central canal, in a manner reminiscent of some hypothalamic neurons in vertebrates. The population 2 is located more medially and laterally in the cerebral vesicle, and it sends projections to the posterior brain and the spinal cord. It could play a role in modulating the activity of the motor pattern generator in this animal. The third population is located in the posterior cerebral vesicle, and exhibits similarities with the area postrema of the vertebrate hindbrain."