Hybocodon octopleurus is a species of hydrozoan in the family Tubulariidae. The type locality is Chefoo Harbour, in China.Kao Cheh-Sheng, Li Fung-Lu, Chang Ün-Mei & Li Hien-Lun, 1958. On the hydromedusae from the Shantung coast. J. Shandong Univ., Natn. Sci. Edition, 1958 1: 75-118, pls 1-9.
Description HHybocodon octopleurus has a length of 1.7 mm. The umbrella is bell shaped, almost spherical, its margin at an oblique angle. The dorsal region, known as the exumbrella, has eight meridional nematocyst tracks. A large, cylindrical stomach two thirds the length of the umbrella cavity. Gonads surround the greenish stomach, not the peduncle or yellowish tube-like mouth, which is armed with nematocysts.
This species differs to Hybocodon prolifer as there are eight nematocyst tracks in the exumbrella instead of five.
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