Fredericella sultana (Blumenbach, 1779)

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 : 52-53

3. Fredericella sultana (Blumenbach, 1779) ( Fig. 3 )

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Material examined. Mangyeong Stream, 34.1585°N, 126.7689°E, 6 September 2016.

Substratum. Plastic bottle.

Remarks. Fredericella sultana was reported for the first time in Korea by Toriumi (1941). Since then, neither colony nor statoblast was found from Korean freshwater until 2016. Thus, this species was redescribed based on the literature in encyclopedia on bryozoans from Korea ( Seo, 2005). Finally, both colony and piptoblast were found in this study. Colony is slender, fragile, freely branched, and transparent to light brownish in color ( Fig. 3A, B ). Zooid is shaped slender tubules and upright from the substratum and its ectocyst is weakly chitinized ( Fig. 3B, C ). Piptoblast within the colony is broadly oval or round with smooth surface and has no annulus. Long sides of piptoblast are nearly straight, parallel with rounded ends and 175.8-179.7 μm long and 321.4- 367.5 μm wide in size. Its length/width ratio is about 1.9 ( Fig. 3D ).

In Korea, there are only two species of the genus Fredericella , F. indica and F. sultana . The surface of the piptoblast of F. sultana is smooth, whereas one of F. indica is strongly reticulate.

Distribution. Korea, Japan, Australia, New Zealand, Britain, Ireland, and Europe.

Figures

Fig. 3. Fredericella sultana(Blumenbach, 1779).A, Colonies(white arrows); B, Piptoblasts(black arrows), within colony; C, D, Piptoblast. Scale bars:A=1 cm, B=1 mm, C=300 μm, D =100 μm.