Pleuretra lineata Donner 1962
Pleuretra lineata: creeping animal (Germany, Hattingen, Bredenscheid, bikepath, bridge, moss, 28.6.2013) (2)
Pleuretra lineata: creeping animal, focal plane on the cuticula (1)
Pleuretra lineata: creeping animal (1)
Pleuretra lineata: crop of the above image, focus on the foot with 4 toes (white triangles) and the spurs (white arrowheads) (1)
Pleuretra lineata: whirling, ventral view (1)
Pleuretra lineata: whirling, dorsal view (1)
Pleuretra lineata: whirling; the ventral transversal folds appear as a sawtoth-like pattern in this lateral view
Pleuretra lineata: cuticula of a macerated specimen (1)
Pleuretra lineata.: focus on the cuticula (left: dorsal cuticula, right: ventral cuticula with characteristic cross folds) (1)
Pleuretra lineata.: The cuticula consists of a syncytial epidermis. The "pores" are actually invaginations of the plasmalemma of the syncytium (1)
Pleuretra lineata, trophi, the unci are folded (1)
Pleuretra lineata, whirling, dorsal view, focal plane on the upper lip (2)
Pleuretra lineata, creeping animal (2)
Pleuretra lineata, trophi with dental formula 2+1/1+2, two different focal planes (2)
About 5 hours after soaking the dry moss with water P. lineata can be found in high densities in the sample which measures up to 50 individuals / ml (2). P. lineata is a species that starts whirling shortly after immersion, thus not wasting time to get new energy to reproduce (2). (Another species starting whirling very shortly after being disturbed is Macrotrachela quadricornifera)
Pleuretra lineata, dead specimen with egg (with alive content) (4). In contrast to some Lecane species, where the resting eggs typically remain in the dead bodies of the mother until the corpse desintegrates it is not clear if the shown phenomenon is typical for Pleuretra.
Pleuretra lineata, egg.
Differential diagnosis: because of the transversal folds Pleuretra lineata maybe confused with M. papillosa, M. papillosa has 3 toes and protrusions on the cuticula of the rump.
Pleuretra lineata, another specimen from (5). This seems to be a variatiety because the animals in this population have a ligula in the sulcus (See image below).
Pleuretra lineata, crop of the above image: the arrow points to the ligula in the sulcus. The trochal columns have a fold on the inner margin (triangles).
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Location: Massa, Tuscany, Italy, wall (1); Germany, Hattingen, Bredenscheid, bikepath, bridge, moss (2); Anhausen, Bavaria (3); Gloer dam, EN-district, Germany (4); Speikboden (altitude 2400m), Tauferer Ahrntal, South Tirol, Italy (5);
Habitat: moss, soil (1) ; dry moss, probably a Grimmia pulvinata-Tortula muralis-community, with exposition to high sun radiation (up to 45 degrees Celsius, see above image ) (2,3,4). This is the typical habitat for this species. I have found the association between the rotifer and these very common mosses more than 10 times, so one may wonder why this species has been described only in 1962. Habitat (5):Dry moss on rocks (Andreaea rupestris), together with A. tuberculosa, A. vaga var. rhomboidea, Pleuretra lineata, Dissotrocha scutellata
Date: coll.: 11.10.2012, det.: 19.10.2012 (1); 28.6.2013 (2); 13.10.2013 (4); oll. 7.10.2014, img 19.10.2014. (5)
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