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The original description of M. cordiformis is based on a single male squid, 80 mm ML with intact tentacles, taken in the Indian Ocean near Sumatra. It has been subsequently described from Japan (Sasaki, 1929) and the Philippines (Voss, (1963). This is the largest of the mastigoteuthids reaching a size of 100 cm ML (A. Salcedo-Vargas, personnal communication).
Figure. M. cordiformis. Left - Ventral view of freshly captured squid, 325 mm ML. Photograph by Mark Norman. Right - Ventral view of the holotype, 83 mm ML. Drawing from Chun (1910).
A mastigoteuthid ...
- without photophores.
- with club bearing very large suckers (ca. 0.5 mm) at proximal end.
- with skin tubercules.