Gasterochisma melampus

Pelvic fins enormous in juveniles, longer than head length. Pelvic fins fitting into a deep ventral groove at all sizes. Interpelvic process tiny and bifid. No anterior corselet. Swim bladder present with two anterior projections that extend into the back of the skull. The morphological adaptations required for maintaining high brain and retinal temperatures are discussed in Ref. 11221.

• Lepidothynnus huttoni Günther, 1889
• Chenogaster holmbergi Lahille, 1903
• Lepidothynnus huttonii Günther, 1889
• Gastrochisma boulengeri Lahille, 1913