Locus coeruleus is a central chemoreceptive site in toads.

@article{NoronhadeSouza2006LocusCI,
  title={Locus coeruleus is a central chemoreceptive site in toads.},
  author={Carolina R. Noronha-de-Souza and K{\^e}nia Cardoso B{\'i}cego and Gustavo Michel and Mogens Lesner Glass and Luiz G. S. Branco and Luciane Helena Gargaglioni},
  journal={American journal of physiology. Regulatory, integrative and comparative physiology},
  year={2006},
  volume={291 4},
  pages={
          R997-1006
        }
}
The locus coeruleus (LC) has been suggested as a CO2 chemoreceptor site in mammals. This nucleus is a mesencephalic structure of the amphibian brain and is probably homologous to the LC in mammals. There are no data available for the role of LC in the central chemoreception of amphibians. Thus the present study was designed to investigate whether LC of toads (Bufo schneideri) is a CO2/H+ chemoreceptor site. Fos immunoreactivity was used to verify whether the nucleus is activated by hypercarbia… 
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Temperature influences neuronal activity and CO2/pH sensitivity of locus coeruleus neurons in the bullfrog, Lithobates catesbeianus.
TLDR
Modulation of cellular chemosensitivity within the LC during temperature changes may influence temperature-dependent respiratory drive during acid-base disturbances in amphibians, and cold-activated/warm-inhibited LC neurons introduce paradoxical temperature sensitivity in respiratory control neurons of amphibians.
Midbrain Structures and Control of Ventilation in Amphibians
TLDR
This chapter reviews the available data on the role of the nucleus isthmi and LC in the control of ventilation in amphibians and reports that this nucleus is a CO2-sensitive receptor site in amphibian, which mediates the ventilatory response to hypercapnia.
Orexin in the toad Rhinella schneideri: The location of orexinergic neurons and the role of orexin in ventilatory responses to hypercarbia and hypoxia
Effect of temperature on chemosensitive locus coeruleus neurons of savannah monitor lizards, Varanus exanthematicus
TLDR
CO2 chemosensitivity is temperature dependent in savannah monitor lizards, where the proportion of locus coeruleus neurons excited or inhibited by CO2 changes with changes in temperature.
Respiratory signaling of locus coeruleus neurons during hypercapnic acidosis in the bullfrog, Lithobates catesbeianus
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