Rotaria socialis Kellicott, 1888
Rotaria socialis, two of several specimens between the legs of a gammarid crustacean. (3)
Rotaria socialis, whirling specimen; frontal view on the corona. (3)
Rotaria socialis, whirling. A very large bdelloid rotifer with conspicuous long spurs. (1)
Rotaria socialis, whirling. This species has a very prominent bulge of the cingulum (arrowheads). The rostrum is orientated perpendicular to the longitudinal axis of the animal while whirling. While most Rotaria-species have eyespots on the rostrum this species is eyeless. (the other eyeless Rotaria species is Rotaria sordida). (1)
Rotaria socialis, anterior part of creeping specimen in dorsoventral view.Upper left: The trochal discs are retracted.Focus plane on the rostral lamella(1). Upper right image: detail of the rostrum . Lower left: rostrum with rostral cilia.Lower left: optical dorsoventral section of the anterior part of specimen from (2). (The plane of the longitudinal section is marked in the lateral view in the image below). Br: brain; DA: (base of) dorsal antenna; Mx: mastax with trophi, (dental formula 2/2). The asterisks mark the subcerebral glands.
Rotaria socialis, another (pregnant) specimen whirling. (1)
Rotaria socialis, foot with conspicuous spurs with bulbous base and small interspace. Length of spurs about 60µm. (1)
Rotaria socialis, lateral view of specimen from (2).
Rotaria socialis, another specimen from (2); lateral view of the anterior part with retracted trochal discs. Inside of the long rostrum, which shows a kink in the middle, a duct which might be connected to the subcerebral glands is recognizable (arrowheads). Another duct (or the same? ?nerves/ muscles?) is marked by asterisks. Br: brain; DA: dorsal antenna;MG: mastax ganglion; Mx: Mastax; Ro: rostrum. The white line approximately characterizes the plane of the optical dorsoventral section of the above image.
Rotaria socialis, lateral view of foot with spurs (Sp) and dorsal toe (DT) and ventral toes (VT) (2). Lac de Poulinoc; St. renan, Brittany, France
Location: Water reservoir Wuppertalsperre, NRW; Germany (1); "De Grote Put", Ekeren, Antwerp, Belgium (2); Lac de Poulinoc; St. Renan, Brittany, France (3)
Habitat: periphyton / mosses; together with Rotaria macrura(1); periphyton/ on rotten willow leaves (2) ; detritus (3)
Date: 15.09.2014(1); 24.02.2015 (2);
freshwater life
marine life