key for bdelloid rotifers, based on conspicuous features
Identification of bdelloid rotifers is not easy. There are some very good keys for the identification for example the "Key to the identification of the genera of bdelloid rotifers" by Claudia Ricci & Giulio Melone. Of course this key and others are scientifically correct, but for the beginner maybe it is difficult to understand, because the problem with dichotomous keys is, that if you cannot decide (for what reason whatsoever) if a certain trait is present or absent, you get stuck and cannot proceed. On the other hand there are certain traits which can be easily observed and that may help to limit the number of possible species in question or even may help to identify them. Here a selection of such traits is introduced.

Basic morphology of bdelloid rotifers

Here is a basic description of some different types of bdelloid rotifers.

 
Integument
integument sculptured
 
 
 
 
integument with spines or other extensions
 
 
 
 
Head
head: corona very wide. CW : HW ≥ 1.4
 
 
 
 
head: corona very narrow CW : HW < 1
 
 
 
 
head: sulcus with ligula
 
 
 
 
head with special features: "auricles"
 
 
 
 
head with special features: lobes at corona
 
 
 
 
eyespots in front more on eyespots
 
 
 
 
eyespots in middle part (brain) more on eyespots
 
 
 
 
Bdelloid taxa without eyespots

There are some genera of bdelloid rotifers in which (up to now 2020) no eyespots habe been observed. So it is possible to exclude some genera in case a bdelloid rotifer with eyespots shall be identified.

These genera are listed here >>>>

Trunk

 
 
 
 
mastax, trophi, dental formula
       
pills in the trunk
       
only 4 nuclei in the vitellarium
       
vivipary
       
Foot
2 appendages at the foot (except spurs!)
       
long foot/ toes/ spurs
 
 
 
 
2 toes
 
 
       
3 toes
       
4 toes
       
Colors
conspicuous colors
       
Behavior
housing/ nest
       
Ecology
specific habitat: living inside of Sphagnum cells
       
specific habitat: living in Frullania lobules
 
 
 
 
 
 
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freshwater life
procaryota
algae
plants
protists
"worms"
molluscs
arthropods
marine life
mediterranean
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misc
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