. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Bonner zoologische Beiträge 56 (2007) 39 Silos, 9 Candelaria, 10 Güimar, 11 Chasna, 12 Abona, 13 Arena 14 Adeje, 15 Santa Cruz de La Palma, 16 Las Bre- ñas, 17 Mazo, 18 Fuencaliente, 19 Valle de Aridane, 20 Taburiente, 21 Puntagorda, 22 Garafía (Cueva del Agua), 23 Barlovento (Las Cancelitas), 24 Puntallana, 25 San Se- bastián, 26 Valle Gran Rey, 27 Hermigua (Cedro-Garajo- nay 28 Vallehermoso (Chorros de Epina), 29 Valverde, 30 Meseta de Nizdafe, 31 Frontera, 32 Deh
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Bonner zoologische Beiträge 56 (2007) 39 Silos, 9 Candelaria, 10 Güimar, 11 Chasna, 12 Abona, 13 Arena 14 Adeje, 15 Santa Cruz de La Palma, 16 Las Bre- ñas, 17 Mazo, 18 Fuencaliente, 19 Valle de Aridane, 20 Taburiente, 21 Puntagorda, 22 Garafía (Cueva del Agua), 23 Barlovento (Las Cancelitas), 24 Puntallana, 25 San Se- bastián, 26 Valle Gran Rey, 27 Hermigua (Cedro-Garajo- nay 28 Vallehermoso (Chorros de Epina), 29 Valverde, 30 Meseta de Nizdafe, 31 Frontera, 32 Dehesa 33 Julán, 34 El Pinar, 35 Tajace. 3. RESULTS 1550 earthworms assignable to Microscolex ditbiiis and Microscolex phosphoreus were studied. Figs 1-3 show the main anatomical-morphological characters and the pres- ent range of distribution for each species. Microscolex dubius (Fletcher, 1887) Eudrilus dubius Fletcher, 1887 Microscolex dubius Rosa, 1890 Remarks. The morphological variability between the ex- amined specimens is minor, except in the pigmentation (different tones of pinkish grey), and body length vary- ing between 30-75 cm. Male pore and prostates tubular on 17. Genital papillae and spermathecae are generally ab-. Fig. 2. Microscolex dubius. External morphology (lateral view); General dissection of the anterior region. sent, whereas small aracemose seminal vesicles nearly al- ways appear in segments 11-12. A hydrophilic species tol- erating high Na concentrations, it was found at humid sites rich in natural or artificial organic matter, and occasion- ally in soils with as little as % relative humidity and % organic matter (Buenavista, Tenerife). Habitat spectrum. It is common in anthropized biotopes in the basal belt below 300 m asl (gardens, parks, green- houses, tropical fruit plantations), and also often found in the medium altitude zones (400-600m) occupied by tra- ditional agriculture, and even in the native forests (Canary pine, and laurel fo
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