Hyalinella punctata (Hancock, 1850)

Chae, Hyun Sook, Kil, Hyun Jong & Seo, Ho Jin Yang and Ji Eun, 2024, Freshwater bryozoans of Korea-observations on living colonies and three new records, Journal of Species Research 13 (1), pp. 50-60 : 53-54

4. Hyalinella punctata (Hancock, 1850) ( Fig. 4 )

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Material examined. Sejong Weir , 23 September 2014 .

Substratum. Rope and paddlewheel.

Remarks. The colonies and floatoblasts of Hyalinella punctata attached to the rope and paddlewheel were obtained from Sejong Weir, since Toriumi (1941) reported from Korea. Colonies are sparsely branching tubule-shaped, thick-walled, transparent near white, gelatinous, smooth and resilient ( Fig. 4A ). Zooids are slightly upright from the branch attached to the substratum and have 41-46 tentacles ( Fig. 4B ). Floatoblasts are lengthy oval (270-420 μm long and 0.22-0.31 μm wide) with dark brown to black fenestra covered with fine tubercles. Young floatoblasts in zooid are white ( Fig. 4C ). H. punctata is known to have only floatoblast of statoblast.

Distribution. Korea, Japan, Taiwan, Australia, Africa, Europe, North and South America.

Figures

Fig. 4. Hyalinella punctata (Hancock, 1850). A, Habitat, paddlewheel (white arrows: colonies); B, Tentacles; C, Floatoblast, young floato- blast in zooid. Scale bars:A =2 cm, B=500 μm, C=300 μm.