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Rare Corythionella and Cyphoderia species in the Hungarian section of the Danube

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82
· “PROTIST–2016”
integrating the information on morphological,
molecular, and ecological features of different
protist species. The content of the web-system
will include morphological descriptions and
differential diagnoses of the species, photos of living
cells and whole mounts, electron-microscopic
illustrations of coverings and cell ultrastructure,
movies of live cells, drawings, sequences of
phylogenetically important genes, molecular
phylogenetic trees, databases on geographic and
biotopic distribution of the species, protistological
literature. Now we focus on four groups of free-living
protists: heterotrophic flagellates, testate amoebae,
ciliates, centroheliozoans. The work on interactive
illustrative keys for some taxonomic groups was
started. Registered on the website users can upload
and edit content, create personal profiles, and topics
on the forum. We invite all protistologists to join
our team. The integrated web-system is available
for observing on the Internet at http://protist.ru/.
This study was supported by the Russian Foundation
for Basic Research (grant 15-29-02518).
HIDDEN DIVERSITY OF FILOSE TESTATE
AMOEBAE IN THE MIDDLE WATERSHED
OF THE DANUBE
Török J.K.
Department of Systematic Zoology and Ecology,
Eötvös Loránd University, Budapest
torokjul@elte.hu
Diversity of filose testate amoebae in the middle
watershed of the Danube has been searched for
decades, but still features with new detections.
Corythionella golemanskyi is first time detected in
Europe in satisfactory number of individuals for
correct identification. Cyphoderia calceolus and
Cyphoderia myosurus specimens found during the last
twenty years make possible to distinguish between
these two similar and rare taxa. Reviewing all the
rare filose testaceans found in the middle watershed
of River Danube from 1962 and considering their
sampled microhabitats, we conclude that these
species are generally adapted to low organic material
content and high oxygen concentration. Testate
amoeba species lists from Hungary are compared
throughout five decades, highlighting habitat
requirements for rare filoseans. We argue, that water
flow has an important role in formation of riverine
testate amoeba communities: Space clearing floods
open new microhabitats for colonization from local
refugia. Microhabitats like sandy riparian zone
remaining free from intensive organic load are
occasionally supplied with additional fresh ground
water, and can maintain favourable environmental
conditions for filoseans for a long time, while prevent
development of diverse lobosean assemblages.
Striking similarity between assemblages of Penard
in the profundal zone of deep Swiss lakes and the
middle watershed of the Danube are attributed to
the above environmental factors. It is still debated,
why majority of the presented species have not
been reported out of Europe. Finally, a concise
methodological proposal is presented to the detection of these inconspicuous testate amoeba
species. Funding: Hungarian Scientific Research
Fund (T49632).
RARE CORYTHIONELLA AND CYPHODERIA
SPECIES IN THE HUNGARIAN SECTION OF
THE DANUBE
Török J.K.
Department of Systematic Zoology and Ecology,
Eötvös Loránd University, Budapest
torokjul@elte.hu
Sandy sediment and seston were investigated
in several sites north from Budapest along the
Danube riparian zone in order to find rare filose
testate amoebae. Finally, ca. 20 kilometers north
from the capital Corythionella golemanskyi tests
were detected in 2015, enough for morphometric
analysis. A repeated sampling four months later
resulted specimens of Cyphoderia calceolus with
enormous form variations. Shell structure details
and morphometry are given for both species.
Characteristics of the latter are compared with
those of Cyphoderia myosurus, detected in 1996–97
sampling of the Danube in the Szigetköz area. As
Penard (1908) has stated, Cyphoderia myosurus
has elongated shell plates. Cyphoderia calceolus,
however, comprises non-overlapping plates, often
kidney shaped, without a regular circular outline.
Morphometry of Corythionella golemanskyi shells
leads us to conclude that the formerly found active
Corythionella specimens (sampled in Szigetkö z
Danube, 1996) belong to another species. The very
first Corythionella specimens ever found in Hungary
were detected as early as 1996 at the same site, but
being not yet described, they were preserved as weird
Cyphoderia laevis specimens. These data suggest that
although Corythionella is present in the Danube, its
shy appearence prevents it from recognition during
analysis of turbid sediment samples. Funding:
Hungarian Scientific Research Fund (T49632).
PARVULARIA GEN. NOV. REPRESENTS A
FILOSE AMOEBA RELATED TO NUCLEARIIDS, THE EARLIEST-BRANCHING LINEAGE OF HOLOMYCOTA (OPISTHOKONTA)
Torruella G.1, López-Escardó D.2, Moreira D.1,
Ruiz-Trillo I.2,3, López-García P.1
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species, corythionella, cyphoderia, hungarian, section, rare, danube
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