Localization of candidate clock neurons in Antarctic krill (Euphausia superba)

Distinct clusters of beta-PDH–positive neurons in the eyestalks and dorsal central brain, plus a PDH-positive fibre network, define the circadian clock’s neuronal architecture in Euphausia superba.

• Why it matters: Marine non-model species like Antarctic krill show circadian and seasonal rhythms, but their clock neuron organization has been unresolved, limiting understanding of timing under extreme Southern Ocean conditions.
• What they did: Using in situ hybridisation and antibody staining, the study mapped core clock gene transcripts cry2 and per and compared them with beta-PDH immunostaining in the krill brain.
• The result: cry2- and per-positive cell clusters in the eyestalks include the beta-PDH-positive neurons, providing the first neuronal description of the circadian clock in Euphausia superba and groundwork for future timing and adaptation studies.

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