Chapter 1 - Núria BONADA

Trichopteran species list
species. For example, because H. infernalis has been collected in southern and central
Spain (see González et al., 1992 and Zamora-Muñoz et al., 1995), we can not ensure
without pupae or adults that larvae collected from Turia Basin are truly H. infernalis or a
variability of H. siltalai.
DISTRIBUTION AND ECOLOGY
Endemic species from the Iberian Peninsula, with a southern distribution.
This species has been associated to permanent siliceous (Ruiz et al., 2001), calcareous
and sedimentary-marls headwaters (Gallardo-Mayenco, 1994; Gallardo-Mayenco et al.,
1998). In the sampled Mediterranean area larvae were found in sedimentary midstream
reaches with a wide range of conductivity and fair riparian and biological quality (Bonada
et al., Chapter 8 and 9).
36- Hydropsyche instabilis (Curtis, 1834)
MATERIAL STUDIED: 697L, 5P♂ (VII), 7♂ (II, VII, VIII)
Ter Basin: T10, T11, T12, TM4
Besòs Basin: B35
Llobregat Basin: L54, L56
Mijares Basin: MI4
Turia Basin: TU4, TU6
Júcar Basin: JU7, JU8
Segura Basin: SE1, SE3
Almanzora Basin: AL2, AL6, AL7
Adra Basin: AD4, AD5
Guadalfeo Basin: GU1, GU2, GU3, GU5, GU6, GU7, GU8, GU9, GU11, GU12, GU13, GU14, GU15,
GU16
DISTRIBUTION AND ECOLOGY
European and Anatolian species. In the Iberian Peninsula is widely distributed.
H. instabilis has been found very abundant in clean headwaters (Vieira-Lanero, 2000).
Our specimens have been collected in mountain siliceous and calcareous headwaters with
a good biological quality. Although it appears to be more tolerant to environmental quality
variables than H. dinarica, it is slightly more sensitive to phosphates.
37- Hydropsyche gr. instabilis (called H. sp1)
MATERIAL STUDIED: 93L, 2P♂ (VII, VIII)
Llobregat Basin: L44
Foix Basin: F25
Mijares Basin: MI3, MI7
Júcar Basin: JU1, JU7, JU15, JU17
Segura Basin: SE1
TAXONOMIC REMARKS
The pupa found is close to H. infernalis and H. fontinalis (M.A. González, pers. comm.).
However, comparing our larvae and H. fontinalis, some differences can be established.
Apotome is not as triangular as in H. fontinalis, with the posterior part not very pointed.
There is always an oral light spot in the apotome more or less conspicuous and joined to
lateral spots (see Figure 3). As in H. fontinalis in the center of the apotome a Y-shaped
brown patch is distinguished. Ventrally, the brown areas of the head are triangular and
smaller than in H. fontinalis. Finally, pronotum is not darker than meso and metanotum
as happen in H. fontinalis. More pupae and adults should be collected to confirm the
identity of these specimens.
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