This series of drawings shows the remarkable elongation in shape of the female at maturity and the maturity-related increase in numbers of simple photophores (dark spots) on the mantle (Voss, et al., 1998)
Figure. Ventral views of growth stages of H. reversa. Top - 39 mm ML, same as title illustration. Middle - 85 mm GL, mature male, 43° 20'N, 59° 27'W. Bottom - 183 mm ML, mature female, 39° 21'N, 70° 41'W. Drawings from Voss, et al. (1998).
The drawings below show the abundance of simple, dark photophores on the head of mature males. To the left is a ventral view, 89 mm ML and to the right is a dorsal view, 107 mm GL (Voss, et al., 1998). These dark photophores are apparent in photographs of a mature male.
Figure. Ventral and dorsal views of the head of a mature male H. reversa. Left - Ventral view, 89 mm ML, 10° 52'N, 22° 09'W. Right - Dorsal view of the head of a mature male, 107 mm GL, 42° 55'N, 62° 13'W. Drawings from Voss, et al., 1998.
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