Desoria

Desoria - covered in short setae (hairs); simple (unforked) setae by the feet; mucro has four teeth but does not possess a lateral seta, apical tooth is large (c.f. Isotomurus).
Isotoma - long setae on all body segments; mucro has three teeth.
Isotomurus - long setae on abd5+6 only; mucro has four teeth, apical tooth smaller than the others (c.f. Desoria).


Genus Desoria:
Desoria infuscata - very rare, upland sphagnum bogs.
Desoria tigrina - common, widespread. Dorsal plus lateral pigment stripes. Macrosetae on abd5 <0.7 length of adb5. (All UK literature records for 'Isotoma olivacea' are probably Desoria tigrina.)
Desoria trispinata - probable horticultural import. No macrosetae on abd. Looks like Vertagopus arboreus but with blue rather than pale legs. Eight ocelli in a rectangular eyepatch, c.f. four in a square patch for Parisotoma notabilis. Nine setae around the feet c.f. eleven in Isotoma.
Desoria violacea - common, widespread. Dark colour with blue/violet iridescence. Macrosetae on abd5 approximately same length of adb5.


Desoria tigrina
"Desoria tigrina (formerly Isotoma tigrina) is widespread and common, with a tendency towards human-impacted soils or habitats rich in organic matter. Desoria tigrina is light to dark grey or brown (never white, dark blue or violet)."





- No macrosetae
- Ocelli B-D-E aligned
- Mucro with 4 teeth and no lateral seta
- Long setae on Abd5 <0.7 length of Abd5



Desoria trispinata - Photo Marie Huskens:





Desoria violacea: