Chapter 1 - Núria BONADA

Trichopteran species list
This species is associated to mountain headwaters at medium altitudes (Vieira-Lanero,
2000). Our larvae were collected in headwaters and middle reaches with a fair to good
water quality.
Micrasema McLachlan, 1876
56- Micrasema longulum McLachlan, 1876
MATERIAL STUDIED: 27L
Adra Basin: AD5
Guadalfeo Basin: GU1, GU2, GU5, GU15
DISTRIBUTION AND ECOLOGY
Central and western European species. In the Iberian Peninsula it is widely distributed.
However, in the sampled Mediterranean basins only has been found in the most southern
basins.
This species presents a wide altitudinal range (Vieira-Lanero, 2000). However, in the
Mediterranean basins sampled, this species is typical from siliceous headwater over
1300m of altitude, what agree with studies performed in high mountainous areas
(Décamps, 1967). It is very sensitive to environmental variables, although it can tolerate
some phosphorous and be present in sites with low biological quality indexes.
57- Micrasema minimum McLachlan, 1876
MATERIAL STUDIED: 28L
Ter Basin: T3, T8, T10
Segura Basin: SE4
DISTRIBUTION AND ECOLOGY
Western European species. In the Iberian Peninsula it has been recorded only in northern
basins. However, in the Mediterranean sampled basins some larvae were found in Segura
basin, enlarging its distribution area.
M. minimum is characteristic from mountain headwaters at high altitudes (Vieira-Lanero,
2000). In the sampled basins, larvae were found in pristine calcareous and siliceous
headwaters over 1000m of altitude.
58- Micrasema moestum (Hagen, 1868)
MATERIAL STUDIED: 212L
Segura Basin: SE1
Almanzora Basin: AL6, AL7, AL8
Adra Basin: AD5
Guadalfeo Basin: GU1, GU2, GU3, GU5, GU11, GU12, GU15
TAXONOMIC REMARKS
Some collected larvae display a pattern similar, although less conspicuous, to what
Vieira-Lanero (2000) called M. gr. moestum.
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