Polyarthra dolichoptera Idelson 1925
Polyarthra dolichoptera: rotifers of the species complex P. dolichoptera/ P. vulgaris possess two ventral finlets (yellow arrowheads). Green arrowheads: striated musculature. (1)
Polyarthra dolichoptera; crop of the above image. (1)
Polyarthra dolichoptera: ventral finlets (yellow arrowheads) of another specimen. Green arrowheads: striated muscles. (1)
Polyarthra dolichoptera: the finlets have a serrated outline. (1)
Polyarthra dolichoptera: one of the rare lateral aspects: focal plane on the dorsal antenna (green arrow) and the ventral finlets (yellow arrow). (2)
Polyarthra dolichoptera: focal plane on the dorsal (upper image) and ventral (lower image) insertion points of the fins. Each of the four packages consists of three fins, which are driven by big striated muscles. (1)
Polyarthra dolichoptera: trophi (Differential Interference Contrast)). (Sprockhövel-Hasslinghausen, pond, 1.6.2012) (3)
Polyarthra dolichoptera: trophi of another specimen (phase contrast) from (3).
Polyarthra dolichoptera: carrying a resting egg (3). After some generations of asexual parthenogenic (amictic) reproduction via amictic diploid eggs a so-called mictic stimulus (which may be the result of changing environmental conditions) causes a generation of mictic females. These haploid females produce haploid eggs which develop into haploid males if not fertilized. These males produce sperm cells which fertilize other mictic haploid eggs. The result is a diploid egg with a durable shell which may survive bad environmental conditions like aridification or low temperatures. (4)
Polyarthra dolichoptera: the resting egg has a double shell; the innner and outer shell are separated/ connected? by I-shaped spines. (4)
Location: Heilenbecker Talsperre, EN (1); Stefansbachtal Gevelsberg, pond (2); (Sprockhövel-Hasslinghausen, Teich, 1.6.2012) (3);Hattingen, Wodantal, pond, (4)
Habitat: Plankton (1,2,3,4)
Date: 02.04.2011 ; 10.04.2014 (4)
freshwater life
procaryota
algae
plants
protists
"worms"
molluscs
arthropods
marine life
mediterranean
tropical
misc
impresssum
plingfactory