| Rotaria sordida, whirling, specimen from (4). Because the integument of the trunk of this rotifer is brownish and may be covered with mucus and detritus this species can be confused with R. tardigrada, but in contrast to the latter it has no (rostral) eyespots. |
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| Rotaria sordida, while feeding and swimming the rostrum is directed to the front and more or less parallel to the longitudinal axis of the body. Alos visible are the rostrum lamellae. (4) |
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| Rotaria sordida, creeping ; the trunk has a characteristic covering of mucus and detritus. The rostrum and head are very long. While many Rotaria-species have conspicuous eyespots this species is eyeless which helps to distinguish it from R. tardigrada (rostral eyespots) or Dissotrocha hertzogi (cerebral eyespots). (1) |
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| Rotaria sordida; the rostrum is the apical part with which creeping in most bdelloids is accomplished. The left image shows the lamellae of the rostrum. Furthermore the rostrum bears cilia which can be protruded (right image). The cilia have sensory function. (3) |
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| Rotaria sordida; focal plane on the posterior part, the anal segment shows a ring (long triangle), the foot with 3 toes which excrete sticky threads (shown by triangles) to adhere to the substrate. (3) |
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| Rotaria sordida; detail of the sculptured integument with pores. (6) |
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| Rotaria sordida, creeping specimen, protruded rostrum (3) |
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| Rotaria sordida; foot with 3 toes and spurs of two different specimens. Left: from (8); right: from (3) |
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| Rotaria sordida; ramate troph; Left: cephalic view, dental formula (DF): 2/2. Right: caudal view, ramus length (RaL): 24µm. Specimen from (5) |
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| Rotaria sordida, specimen from (1); left: feeding/ whirling; right: this species is also characterized by two conspicuous bumps on each side of the head (marked with arrowheads). (1) |
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| Rotaria sordida; whirling (feeding) specimen from (7); dorsoventral view. |
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| Rotaria sordida, creeping specimen, protruded rostrum (8) |
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| Rotaria sordida; creeping specimen with extended rostrum / rostrum lamella ; dorsoventral view. (8) |
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| Location : Gevelsberg, Stefansbachtal, Brücke am Schulzentrum (1); Gevelsberg, Grünes Klassenzimmer, pond (2); Hattingen, NRW, Germany, Am Brunnen, forest (3); Club Ocellaris, Anilao, Philippines (4); Le Conquete, Brittany, church yard, granite bowl (5); Fort du Mengant, Brittany, France (6); MERO, Tulamben, Bali, Indonesia; wall (7); |
| Habitat: liverwort (Marchantia polymorpha)(1); periphyton (2); beech litter (3); Moss on limestone (4); between algae (5); moss (6); (7) |
| Date: 26.9./ 27.9. 2009 (1); 30.12.2012 (3); 28.04.2016 (4); 13.08.2018 (5); 15.08.2020 (6); 06.09.2023 (7); |
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