1. Tentacles
1. Club with suckers.
2. Stalk with four series of suckers and pads in distal 1/2 to 2/3.*
   

   Figure. Oral view of tentacle-cub of T. pellucida, 140 mm ML. Drawing from Voss (1985, p. 43. fig. 12g).

2. Funnel
1. Funnel valve absent.
2. Funel organ: Dorsal pad with three papillae.
   

   Figure. View of funnel organ of T. maculata, 123 mm ML. Drawing from Voss (1985, p. 33, fig.8f).

3. Mantle
1. Tubercles present (1-4) at funnel-mantle fusion.
   

   Figure. Ventral view of tubercule at funnel-mantle fusion of T. maculata, 123 mm ML. Drawing from Voss (1985, p. 33, 8e).

4. Fin
1. Anterior third or more inserts on mantle (in subadults) rather than shell-sac of gladius.***
   
   
   

   Figure. Ventral view of the fin of T. megalops, showing fin shape. Photograph by M. Vecchione.

   
   
5. Photophores
1. Three photophores on each eye.**
2. Photophores present on all arm tips of mature females.
   

   Figure. Left - Ventral and lateral views of an eye of T. maculata, 123 mm ML, showing ocular photophores. from Voss (1985, p. 33, fig. 8c,d). Right - Ventral view of the eyes of T. megalops, 134 mm ML, North Atlantic. Photographed during the MarEco cruise on the R/V G. O. SARS by R. Young.

*Unique in family but see Bathothauma and Megalocranchia.
**Unique in family.
***Unusual in family; shared with Egea.

Comments

Characteristics are from Voss (1980).