Omi Island is located in the Sea of Japan coast of Yamaguchi Prefecture.
This larva of mantle length was about 4mm.
Mantle is translucent, brachial membrane envelops head and arms.
Ciliary process are lined to Mantle.
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| Lateral view |
Dorsal arms has very large suckers. Sucker is gradually to bigger from the tip, and the largest sucker is fourth from the tip. Web of arms is not yet developed.
Chromatophores present on inner edge of each sucker, and absent on funnel.
Orange large iridophores are arranged around the eyes.
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| Dorsal view |
Mantle typically triangular in shape.
Dorsal mantle scattered with chromatophores.
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| ventral view |
Large eyes are facing the ventral.
Ventral mantle patterned with a band of yellow from red chromatophores along anterior margin.
Other Notes;
Often, adult of Tremoctopus gracilis appear to Omi Island in late summer. Genus Tremoctopus are pelagic octopus that live on the surface to 250m. And also known to feed on Pteropod Molluscs and small fishes. Larva often known that hold on Physalia tentacles in arms I and II.
REFERENCES
Sweeney, M.J., Roper, C.F.E., Mangold, K.M., Clarke, M.R., and Boletzky, S. v. 1992. 'Larval' and juvenile cephalopods: a manual for their identification. Smithsonian Contributions to Zoology - No. 513. 282pp.
Norman, M.D. 2000. Cephalopods A World Guide. Frankfurt, Germany, IKAN Publishing. 320 pp.
Jereb,P., Roper,C.F.E.,Norman,M.D.,Julian,K.F., 2014. Cephalopods of the World. An annotated and illustrated catalogue of Cephalopod species known to date Volume 3 Octopods and Vampire Squids. FAO Species Catalogue for Fishery Purposes No.4, Vol.3. 382pp.
