Plumatella repens ( Linnaeus, 1758 )

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 : 56-57

* 10. Plumatella repens ( Linnaeus, 1758) ( Fig. 8 ) "ťẍūḓ끼ḇNj (ljḡ)

Tubipora repens Linnaeus, 1758: 790 .

Plumatella repens ; Wood et al., 1998: 642, figs. 7, 11; Wood and Okamura, 2005: 59, 89, figs. 29b, 30, 31, 52; Hirose and Mawatari, 2011a: 7 , fig. 2E.

Material examined. NIBRIV0000909399, Daewi Reservoir, 19 May 2016; Chopyong Reservoir, 2 August 2016.

Substratum. Unknown.

Description. Floatoblast oval, brown, prominence on both sides, 284 μm long by 207 μm wide, with length/ width ratio of about 1.4. Ventral fenestra of almost circular, 122 μm long by 108 μm wide, covered with rounded tubercles on reticulation ( Fig. 8A, B ). Annulus smooth ( Fig. 8C, D ).

Remarks. This species is reported from Korea for the first time. Only floatoblasts were found. The shape of statoblasts is essential for identification ( Wood and Okamura, 2005). Notably, Pl. fungosa and P. rugosa may have been misidentified as Pl. repens , because their statoblasts look similar to each other. The annulus of three species is distinguished with each other by SEM photography only. Plumatella repens is distinguished from both Pl. fungosa and Pl. rugosa by having a smooth annulus.

Distribution. Korea and Plumatella repens is common, and broadly distributed worldwide ( Hirose and Mawatari, 2011a).

Figures

Fig. 8. Plumatella repens (Linnaeus, 1758). A, Ventral, flatoblast; B, C, Enlarged view of the annulus and fenestra in A; D, Annulus. Scale bars:A =100 μm, B=50 μm, C, D=10μm.