ISSN 1062-3590, Biology Bulletin, 2017, Vol. 44, No. 7, pp. 643–647. © Pleiades Publishing, Inc., 2017.
Original Russian Text © A.G. Rogozin, 2015, published in Zoologicheskii Zhurnal, 2015, Vol. 94, No. 4, pp. 392–396.
New and Rare Typhloplanoid Species
for Fauna of the Urals and Russia
A. G. Rogozin
Ilmen State Reserve, Ural Branch, Russian Academy of Sciences, Miass, 456317 Russia
Received February 19, 2014
Abstract⎯Morphological decriptions and information on the biology and distribution are given for the first
time for fauna of the Urals turbellarians from the Neorhabdocoela order of the Typhloplanidae family: Stron-
gylostoma simplex Meixner 1915, Typhloplanella halleziana (Vejdovsky 1880), Phaenocora rufodorsata (Sekera
1904). The species Typhloplanella halleziana was found the first time on the territory of Russia.
Keywords: Turbellaria, Neorhabdocoela, Typhloplanidae, new species for the Urals and Russia, Strongy-
lostoma simplex, Typhloplanella halleziana, Phaenocora rufodorsata, fauna, Urals, Russia
The studies conducted in the lakes of the eastern
slope of the Southern Urals allowed us to detect three
turbellarian species from the Typhloplanidae family
that are new for the Ural fauna, including
Typhloplanella halleziana (Vejdovsky 1880), which was
found for the first time on the territory of Russia. The
descriptions and figures were carried out based on
study of live individuals strongly pressed by a cover
Strongylostoma simplex Meixner 1915
M a t e r i a l. One sexually mature individual from
Baraus Lake (55°08′14′′ northern latitude, 60°20′03′′
D e s c r i p t i o n. The body length is 0.7–0.8 mm,
width up to 1/3 the length. The body shape is fusiform,
anterior and posterior ends are smoothly rounded.
Constriction is barely visible behind the eyes; the max-
imal body width is in the central part. The animal is
colorless. We observed no reddish brown pigment reg-
istered by Luther (1963). A fan of short rhammitic
ducts is located at the anterior end of the body. The
pharynx with a diameter till 120 μm lies at the begin-
ning of the second third of the body. Genitals closely
adjoin it from the caudal side.
Testicles have a variable form (from rounded to
oval) with a diameter of approximately 100 μm and lie
laterally behind the pharynx. The male copulative
organ is elongated-oval with a length of approximately
50 μm. Its wall is composed of two layers of spiral mus-
cle fibers. Seminal ducts separately fall into its top and
are proximally located by the oval seminal bladder.
A granular prostatic secretion is located in the distal
part of the organ and surrounds the ejaculatory duct.
The latter represents a straight or wavy cuticularized
tube, sometimes with perceptible expansion along the
duct. It opens at the top of the almost not isolated
penis papilla. There is no copulative vagina, and the
male copulative organ is directly separated from the
total sexual vagina by means of a ring sphincter.
The ovary is elongated-pear-shaped, located to the
left close to the male copulative organ. The sperma-
theca is well isolated, large (the length till 45 μm),
retortlike. Vitellaria are papillary, lie laterally between
the beginning of the second third and anterior body
end. The spermatheca and vitellarium ducts open to
the short poorly isolated ductus communis, which is
separated from the total sexual vagina by a sphincter.
There is a single egg in the uterus, reddish brown, cir-
cular, with a diameter up to 140 μm.
Biology. According to Luther (1963), it is an
inhabitant of submerged vegetation, mainly bushes of
charcoal algae in cold Alpine water reservoirs. We
found it in shallow water (to 1 m) in gray-green gran-
ular sludge at maximal water heating in July. It is obvi-
ous that the species is more ecologically plastic than
was previously assumed.
D i s t r i b u t i o n. Upper Volga (Korgina, 1988);
Austria, Italy, Iceland (Luther, 1963, the Strongy-
lostoma simplex simplex Luther 1963 subspecies), Fin-
land (the Strongylostoma simplex lapponicum Papi in
Luther 1963 subspecies). At present, the Urals is the