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Gonatus pyros is a small gonatid. A spent female measured 125 mm ML (SBMNH no. 61050). Nesis (1982/87) states that some individuals are known to be up to 160 mm ML. G. pyros is distinctive in being the only gonatid known to possess photophores.
A Gonatus with ...
- a large photophore on the ventral surface of each eyeball.