Rotaria socialis Kellicott, 1888
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. 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 species is Rotaria sordida). (1)
Rotaria socialis, left image: anterior part of creeping specimen in dorsoventral view. The trochal discs are retracted. No pigmented eyespots are visible. (1). Right image: 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: masteax 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).
Location: Water reservoir Wuppertalsperre, NRW; Germany (1); "De Grote Put", Ekeren, Antwerp, Belgium (2)
Habitat: periphyton / mosses; together with Rotaria macrura(1); periphyton/ on rotten willow leaves (2)
Date: 14.09.2014(1); 24.02.2015 (2)
freshwater life
marine life