By Nicole Webster
Last week I showed you a larval squid of unknown age *n*, here’s n+7!
Full body shot of Doryteuthis opalescens Credit: N Webster
They are much more active, with clearly visible heart beats, functional chromatophores, and active swimming. As a result it wouldn’t stay still long enough to get a good depth photo, so I resorted to a series:
Shot of the iridescent eye, and two apparent types of chromatophores: red ( erythrophores) and black (melanophores). The eye appears fully developped this week, whereas it was still red, and undefined last week. Credit: N Webster
A close up view of the tentacles with evident suckers, although they seem out of proportion. Credit: N Webster
The mantle cavity seen here is still transparent. Left: The tree-like structure is one of two ctenidia used for gas exchange. The bubble on the left side is the beginnings of the reproductive and gastrointestinal tracts and organs. The distictive large black spot is probably the inksac! The heart is visible as the blob between the ctenidium and the ‘gut’. It was beating regularly. Right: The structure of the epidermis is visible , and the chromatophores are in focus. Credit: N Webster