1. Tentacles
1. Distal suckers on club restricted to terminal pad.


Figure. Oral view of club tip, A. lichtensteinii, type A, 110 mm ML, USNM 294756. Photograph by R. Young.

2. Head
   1. Occipital folds number 10 (Naef, 1921-23) or 8 - 9 (Kubodera, et al., 1998) on either side of head.
      
      

      Figure. Left photographs - Lateral and dorsoblique views of the occipital folds, A. lichtensteinii, Type A, preserved, 110 mm ML, 20°27'N, 21°58'W, USNM 294756. Photograph by R. Young.. The white arrows point to occipital fold number 3. Right drawings - Dorsal and lateral views of head and occipital folds, A. lichtensteinii, 145 mm ML, Mediterranean Sea. Drawings from Pfeffer, 1912.

3. Photophores
   1. Photophores absent.
      
      
4. Gladius
   1. Gladius not visible on dorsal side of mantle (i.e., mantle muscle completely surrounds gladius - see title illustrations).

Comments

(Kubodera et al. (1998) state that an oval, opaque area with posterior small patch of photogenic tissue is present on the ventral covering of the eye. We suspect that this is a misinterpretation of iridescent tissue.

Kubodera et al. (1998) briefly described four geographical morphotypes, three forms in the Atlantic and one in the Pacific. The South Atlantic and South Pacific forms, however, probably belong to Notonykia africanae (Nesis et al., 1998). The other two of their forms are mentioned here under a subsequent page, "Additional features of the description," where there are called Type A (typical A. lichtensteinii) and Type B, whose most distinctive feature is the rhomboidal shape of the fins. Presently insufficient information is available to evaluate the significance of these differences.