Plumatella geimermassardi Wood & Okamura, 2004

Satkauskienė, Ingrida, Wood, Timothy, Rutkauskaitė-Sucilienė, Jurgita, Mildazienė, Vida & Tuckutė, Simona, 2018, Freshwater bryozoans of Lithuania (Bryozoa), ZooKeys 774, pp. 53-75: 53

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Plumatella geimermassardi Wood & Okamura, 2004


Plumatella geimermassardi Wood & Okamura, 2004  Fig. 3

Material examined.

A few floatoblasts from Lampėdžiai Lake in April 2016. P. geimermassardi  were recorded in Lithuania for the first time. However, the species is so far represented only by statoblasts.


Floatoblasts were identified by the large dorsal fenestra with tubercles and narrow annulus. The annulus at the poles is mostly as large as laterally and is covered by weakly visible tubercles (Fig. 3). Length and width of floatoblast were 311-325 (317 ± 4) μm and 221-273 (244 ± 15) μm (n=3) respectively. L/W ratio 1.3; DfL 199-205 (202 ± 3) μm; DfW 174-201 (187 ± 13) μm (n=3); VfL 200-254 (227 ± 26) μm and VfW 185-198 (192 ± 6) μm (n=3).

Distribution in Europe.

Plumatella geimermassardi  is known from England, Ireland, Belgium, southern Norway, northern Germany, Italy and Finland ( Wood and Okamura 2005).


Floatoblasts of P. geimermassardi  are among the smallest floatoblasts among all European plumatellids with an average length of around 320 µm ( Wood and Okamura 2004). The uniformly narrow annulus offers an easy identifying feature characteristic for broad floatoblasts in this species. The relatively large area of dorsal and ventral fenestrae is matched only by those of P. nitens  or Stephanella hina  on other continents ( Wood 1996; Toriumi 1955).