Pleuretra lineata Donner 1962
Pleuretra lineata: whirling animal. The arrrowheads mark some (those which are in focus in this image) of the transversal striations which are a characteristic trait in the dorsal longitudinal folds of P. lineata. (5)
Pleuretra lineata: creeping animal. (2)
Pleuretra lineata: creeping animal, focal plane on the integument (1)
Pleuretra lineata: creeping animal (1)
Pleuretra lineata: left: crop of the above image, focus on the foot with 4 toes (white triangles) and the spurs (white arrowheads) (1). Right image: foot with granulated integument, ventral view. Short and blunt-ended spurs.
Pleuretra lineata: whirling, ventral view (1)
Pleuretra lineata: whirling, frontal view (1)
Pleuretra lineata: whirling; the ventral transversal folds appear as a sawtoth-like pattern in this lateral view.Also visible is the long and conspicuous dorsal antenna. (4)
Pleuretra lineata: the dorsal antenna has two segments which are partly contracted like a telecope in this image. (4)
Pleuretra lineata: integument of a macerated specimen (1)
Pleuretra lineata.: focus on the integument (left: dorsal integument, right: ventral integument with characteristic cross folds) (1)
Pleuretra lineata: The integument consists of a syncytial epidermis. The "pores" are actually invaginations of the plasmalemma of the syncytium (1)
Pleuretra lineata: integument of the dorsal side with transversal folds. (5)
Pleuretra lineata, ramate trophi, dental formula 2+1/1+2. (1)
Pleuretra lineata, whirling, dorsal view, focus plane on the upper lip (2)
Pleuretra lineata, creeping animal. Sometimes the integument shows some hair-like structures as can also be seen in the following images.(2)
Pleuretra lineata, detail of the hair-like structures (28.06.2013).
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). (5)
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); 12.10.2013 (4); oll. 7.10.2014, img 21.10.2014. (5)
freshwater life
marine life