This page shows additional views of the arms of both the male and female. Most arms have been stained with methylene blue stain to enhance detail.
Figure. Ventral views of arms I of Iridoteuthis sp. A, mature male. Left - Right arm I with some of the membrane/mucous intact. Middle - Right arm I with much of membrane/mucous removed. Note that there appears to be no modification of the suckers. Right - Left arm I with much less membrane of the dorsal margin. Photographs by R. young.
Figure. Oral views of arms II-IV of Iridoteuthis sp. A, mature male. Left - Arm III, most of arm; compare with adjacent image to see arm base. Note large aboral flag. Middle - Arm II. Arms II and III appear to have normal biserial sucker arrangement. Right top - Tip of arm IV showing irregular arrangement of multiple sucker series. Right bottom - Bases of arms III and IV showing absence of basal papillae. Photographs by R. Young.
Figure. Two aboral views of a twisted arm IV of Iridoteuthis sp. A, male, showing where the lateral membrane appears to become more muscular. Photographs by R. Young.
Figure. Oral views of arms I of Iridoteuthis sp. A, female. On the left arm, the arrows point to the last four suckers prior to the bare tip. On the right arm, the single arrow points to either the last normal sucker or an aborative sucker prior to the bare tip. Photograph by R. Young.
Figure. Oral views of arms III and II of Iridoteuthis sp. A,female. Left - Arm III. Note that suckers terminate well proximal to the arm tip. Note also the papillate arm base and the large, distal aboral flag. Middle top - Tip of the same arm III with slightly altered view. Middle bottom - Enlarged view of same arm tip. Note that the structure appears to be complex with perhaps transverse ridges. Exact structure could not be determined. Right - Arm II showing biserial sucker arrangement throughout. Photographs by R. Young.