Rotaria rotatoria Pallas, 1766
Rotaria rotatoria: whirling specimen from (5); in contrast to some other Rotaria-species like for example R. macrura this species is characterized by a rostrum (arrowhead) that is aligned perpendicular to the longitudinal axis of the animal. The transect of the rostrum is semicircular.
Rotaria rotatoria: pregnant specimen from (6) with 3 descendants: two eggs (arrowheads) and one already fully grown embryo (arrow). Rotifers of the genus Rotaria are viviparous.
Rotaria rotatoria: creeping specimen, lateral view; focus plane on the dorsal antenna. In contrast to Rotaria macrura the dorsal rostrum lamella is longer than the ventral side which gives a beak-like appearance.(5)
Rotaria rotatoria: habitus while whirling; the whole animal is pretty slender, no distinct humps, with long foot. (1)
Rotaria rotatoria: creeping movement(1)
Rotaria rotatoria: dorsal view of the head, whirling. Focus plane on the red eyespots of the rostrum (5). It seems as if the rostrum is orientated orthogonally to the longitudinal axis (see image below) and thus the ventral side of the rostrum might be semicircular.
Rotaria rotatoria: another specimen (4.4.2012, Haspelmoor, Bavaria) while whirling, lateral view. The rostrum is orientated orthogonally to the longitudinal axis. The colony of algae which is in the vortex of the trochal discs is Synura sphagnicola. (3)
Rotaria rotatoria: if, while whirling, particles which are too big get into the vortex of the corona (or if other organisms like nematods are beating nearby) the corona and rostrum are retracted. Some seconds later the rostrum starts coming out and testing using the cilia if the danger is over. Lateral view with focus on the dorsal antenna and the rostrum. The cilia of the still retracted trochal discs are visible. (2)
Rotaria rotatoria; rostrum with divided lamella and two red eyespots (4)
Rotaria rotatoria, rostrum with cilia. The cilia have probably sensory functions.(2)
Rotaria rotatoria, rostrum of a whirling specimen. The upper image shows an optical transect of the rostrum. The arrowheads point to the bulbous base of two sensory bristles which are visible in the lower picture. (Both pictures are still images from a video). (5)
Rotaria rotatoria; focus on the retractable foot which acts like a telescope
Rotaria rotatoria; foot with spurs (s) and 3 toes (Z). The number of toes is important for the identification of the different bdelloid genera. (1)
Rotaria rotatoria; integument. In contrast to other Rotaria rotifers like Rotaria neptunia the integument has small wraeths of 5 or 6 protuberances around each pore. (6)
location: Gevelsberg Grünes Klassenzimmer (1); Wuppertal, compensation pond (2); Haspelmoor, Bavaria (3); Hattingen Oberstueter, pond (5); St. Mathieu, Bretagne, France, creek (6=
habitat: periphyton (1; 2; 3; 5; 6)
date: 24.01.2012 (2) 04.04.2012 (3); 19.01.2012 (4); 25.08.2016 (5); 26.08.2020 (6)
freshwater life
marine life