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Taxonomy Summer School1-15 September 2008
EDITPresentation title
Presenter’s positionPresenter’s name
laboratory:microscopic animals
bdelloid rotifers
Taxonomy Summer School1-15 September 2008
Sampling sites:lake, Lago della Piastra
stream, Torrente Gesso della Barra
Taxonomy Summer School1-15 September 2008
Nematoda
Taxonomy Summer School1-15 September 2008
Tardigrada
Taxonomy Summer School1-15 September 2008
Gastrotricha
Taxonomy Summer School1-15 September 2008
Rotifera
Monogononta
Bdelloidea
Taxonomy Summer School1-15 September 2008
dorsal (1) and lateral (2)
H, head; T, trunk; F, foot;
b, brain; bl, bladder; cl, cloaca; co, CORONA; ex, excretory apparatus; gg, gastric glands; gv, germo-vitellarium; i, intestine; m, MASTAX WITH TROPHI; n, nephridium; pg, pedal glands; ra, retrocerebral apparatus; sg, salivary glands; t, toe.
Rot
ifer b
aupl
an
Taxonomy Summer School1-15 September 2008
Rot
ifer t
roph
i
Taxonomy Summer School1-15 September 2008
Traditionally, three major groups:
Seisonida
Monogononta
Bdelloidea
(+Acanthocephala)
Taxonomy Summer School1-15 September 2008
ROTIFERA: Seisonida
One genus, Seison
Three speciesS. africanusS. annulatusS. nebaliae
All marine
Epibiont on Nebalia(Crustacea Leptostraca)
Sex-ratio 1:1
Taxonomy Summer School1-15 September 2008
ROTIFERA: Monogononta
Three Orders
Ploima (21 Families, ~1400 species)
Flosculariacea (6 Families, ~130 species)
Collothecacea (2 Families, 37 species)
Very common, rich, abundant, and widespread
Cyclical parthenogenesis
Mostly females
Resting eggs
Taxonomy Summer School1-15 September 2008
ROTIFERA: Bdelloidea
Three Orders, four Families, ~450 species
Obligate parthenogenesis (amictic thelytoky)
Only females
Anhydrobiosis
Taxonomy Summer School1-15 September 2008
Bde
lloid
rotif
ers
A) Adineta vaga, B) Habrotrocha gracilis, C) Philodina vorax; a, dorsal antenna; g, gut; gv, germovitellaria; m, mastax; r, rostrum; s, spurs; t, trochi; to, toes. Scale bars, 50 µm.
Taxonomy Summer School1-15 September 2008
ROTIFERA: where to find them
Every continental habitat, freshwater: very common and abundant~ 1700 species
Saltwater (marine and brackish): rare and uncommon ~ 300 species
Most species are free-living or sessile, solitary or colonial, while some are epizoic or parasitic.
The majority of rotifers inhabit the psammon, or display a benthic/periphytic way of life, while the plankton is less species rich and less abundant.
Taxonomy Summer School1-15 September 2008
ROTIFERA: how to find them
fine-mesh (25-50 µm) plankton net through the open water, submerged vegetation or littoral macrophytes of any type of water body.
flexible collecting tube attached to a large syringe
scraping of the uppermost centimeter of sand
collecting mosses, lichens and soil
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