THE GENUS KERATELLA BORY DE ST. VINCENT, 1822 (ROTIFERA) IN UZBEKISTAN (CENTRAL ASIA) (7-10)

Национальная ассоциация ученых (НАУ) # 52, 20 20 7
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THE GENUS KERATELLA BORY DE ST. VINC ENT, 1822 (ROTIFERA) IN UZBEKISTAN
(CENTR AL ASIA)

Saparov Abdurakhman Danabaevich
candidate of biological sciences, dean
Nukus State Pedagogical Institute, Nukus
Mirabdullayev Iskandar Mirbatirovich
doctor of biological sciences, professor
Tashkent State Agrarian University, Tashkent

РОД KERATE LLA BORY DE ST. VINCENT , 1822 ( ROTIFERA ) В УЗБЕКИСТАНЕ
(ЦЕНТРАЛЬНАЯ АЗИЯ)

Cапаров Абдурахман Данабаевич
кандидат биологических наук, декан
Нукус ский государственный педагогический институт, г. Нукус
Мирабдуллаев Искандар Мирбатирович
доктор биологических наук, профессор
Ташкентский государственный аграрный университет, г. Ташкент

Abstract
Five species of the genus Keratella have been recorded in Uzbekistan: K. cochlearis, K. procurva, K. tropica,
K. valga, K. quadrata. Data on morphology and distribution of the species are given. A key to species is proposed.
Аннотация
Пять видов рода Keratella отмечены в водоемах Узбекистана : K. cochlearis, K. pr ocurva, K. tropica, K.
valga, K. quadrata. Приведены сведения об их строении и распространении. Предложен ключ для
определения этих видов.
Keywords : Rotifera, Keratella, morphology, distribution, key to species, Uzbekistan.
Ключевые слова: коловратки, Kera tella , строение, распространение, определит ельный ключ,
Узбекистан.

Introduction
Keratella is a common and ub iquitous genus
Keratella . According to Segers and De Smet [10] there
are 53 known taxa in the genus Keratella . However,
real number may be signif icantly more, because recent
molecular studies show that many (probably most or
even all) species of Rotifera a re in fact cryptic species
complexes (i.e. distinct species that are
morphologically difficult to distinguish ). It was shown
for Brachionus calyc iflorus [4], Brachionus plicatilis
[7], Keratella cochlearis [1] and many other rotifers. It
is highly likely t hat such cryptic diversity is far more
common than thought in rotifers [10].
In her monography on Rotifera Mo nogononta of
the USSR L.A. Kutikova [6] listed three species of the
genus Keratella in Central Asia: K. cochlearis (Gosse,
1851) , K. tropica (Apste in, 1907) , K. paludosa (Lucks,
1912). In this paper we present data on morphology and
distribution of the species recorded in Uzbekistan and
prop ose key for their determination (table 1).
Material and methods
Material was collected using conical a plankton ic
net from all region s of Uzbekistan and all types of
waterbodies (lakes, reservoirs, ponds, rice fields, pools
etc.) during 1980 -2018. Also zoo plankton collections
of the National University of Uzbekistan, the Bukhara

8 Национальная ассоциация ученых (НАУ) # 52, 20 20
State University, the Fergana State University, and the
the Karakalpak Research Institute of Natural Sciences
(Nukus) have been studied.
All drawings have been made by using a drawi ng
tube.
Results
Five species of the genus Keratella have been
recorded in Uzbekistan: K. cochlearis (Gosse, 18 51) ,
K. procurva (Thorpe, 1881) , K. tropica (Apstein,
1907) , K. valga (Ehrenberg, 1834) , K. quadrata (O.F.
Müller, 1786) .
Keratella cochlearis (G osse, 1851)
(Fig. 1 a, b)
Morphology . The lorica is similar to a spoon, with
a convex dorsal and almost flat ve ntral si de. From the
anterior facet of the dorsal plate goes back the middle
crest. Facets are covered with mesh or dots. In
Uzbekistan 2 forms: K. cochlearis cochlearis (Gosse,
1851) and K. cochlearis tecta (Gosse, 1851) (without
posterior spine). Length of loric a 100 -150 µm.
Distribution . Cosmopolitan species [10]
inhabiting in Uzbekistan different waterbodies (ponds,
lakes, reservoirs, ricefiel ds).
Keratella procurva (Thorpe, 1881)
(Fig. 1 c, d)
Morphology . Morphology is typical for Keratella
procurva p rocurva (Thorpe, 1881). The anterior
margin of the lorica with 6 spines, of which 2 are two
central longer lateral and intermediate, and bent on the
abdominal side. The dorsal side of the lorica with a
longitudinal row of 4 median facets, the last of which
is pent agonal in shape and ends with a middle rib.
Facets are covered with dots like the front third of the
ventral surface of the lorica. The p osterior margin of the
lorica bears 2 lateral spines. The left spine in Bukhara
population may be significantly shorter than the right
or completely absent. Length of lorica (L) = 80 -110
µm. Width of anterior margin of lorica 0.80 -0.90 times
as long as max imal width (W) of lorica (x = 0.85). L /
W = 1.35 -1.60 (x = 1.45). Length of right posterior
spine 0.22 -0.43 (x = 0.29) times as long as lorica.
Unlike the original description, the individuals
from Uzbekistan were not really ”procurva” i.e. their
lorica’s ventral side was so heavy concave.
Distribution . Tropicopolitan species [10]
reported from Australia [5], Spai n [2], S outh America,
India [11], Malaysia [3], etc. In Uzbekistan this species
was recorded in fishponds of Kashkadarya and Bukhara
Provinces [8 ]. It is apparently the northernmost records
of K. procurva.
Keratella valga (Ehrenberg, 1834)
(Fig. 1 e)
Morph ology . L orica quadrangular, on the sides
usually swollen. Задний край панциря с 2 неравными
шипами – левый шип короче правого, иногда
отсутствует , реже шипов нет вообще. The posterior
margin of the lorica with 2 unequal spines – the left
spine is shorter t han the right, sometimes absent, rarely
spines absent at a ll. Length of lorica 180 -210 µm.
Distribution . Cosmopolitan species [10], more
usual in small waterbodies (ponds, small lakes) in
northern region of Uzbekistan (Karakalpakstan).
Keratella tropica (Apstein, 1907)
(Fig. 1 f)
Morphology . The lorica is elonga ted, at the back
narrowed, ahead extended. A dorsal plate with a
longitudinal row of 5 median facets. The posterior edge
facet is small and almost rectangular. Posterior with 2
lateral uneven length spines or only with 1 right spine.
Length of lorica 180 -220 µm.
Distribution . Cosmopolitan warm -water species
[10], more usual in small waterbodies in southern and
central provinces of Uzbekistan.
Keratella quadrata (O.F. Müller, 1786)
(Fig. 1 g)
Morphol ogy . Lorica almost quadrangular, from
the sides usually fl at, less often slightly swollen. The
posterior margin with 2 usually quite long and
diverging to the sides spines. The spines are usually of
equal length. Length of lorica 280 -320 µm.
Distribution . Cosmopolitan cold water species
[10]. In Uzbekistan in po nds and lakes, freshwater and
brackish, usually at cold time.

Национальная ассоциация ученых (НАУ) # 52, 20 20 9
Fig. 1. Keratella spp. from Uzbekistan. a, b: K. cochlearis ; c, d: K. procurva ; e: K. valga ; f: K. tropica ; g: K.
quadrata
Table 1.
Table for determination of species of the genus Keratella of the fauna of Uzbekistan
Characters Species
1 Dorsal plate of lorica with 2 central medial facets divided by medial ridge; posterior
margin of lorica with 1 medial spine or without it K. cochlea ris
– Central medial facets of dorsal plate of lorica are not divided by medial ridge;
posterior margin of lorica with 1 -2 lateral spines 2
2 Posterior margin of lorica with 2 medial facets divided by longitudinal medial ridge K. procurva
Posterior ma rgin of lorica with 1 medial facet limited by 2 lateral ri dges 3
3 Dorsal plate of lorica with medial row of 4 hexagonal facets; posterior edge of lorica
with 1 -2 usually the same length spines 4
– Dorsal plate of lorica with medial row of 5 facets; last facet small, quadrangular;
posterior margin of lorica wit h 1 -2 unequal length spines K. tropica
4 Lorica almost square; its lateral sides usually even K. quadrata
– Lorica elongated -rectangular, its lateral sides usually swollen K. valga

Conclusion
Five species of the genus Keratella have been
observed in t he fauna of Uzbekistan. However, the use
of more thorough morphological (primarily
ultrastructural) and especially molecular methods can
reveal greater diversity.

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