Simulium (Wilhelmia) lineatum (Meigen)

Crosskey, Roger W. & Crosskey, Margaret E., 2000, An investigation of the black ¯ y fauna of Andalusia, southern Spain (Diptera: Simuliidae), Journal of Natural History 34 (6), pp. 895-951 : 938-939

27 Simulium (Wilhelmia) lineatum (Meigen)

Spain references: Grenier and Bertrand (1954, as salopiense), Luna de Carvalho (1963, as salopiense, Spain listed without locality), Carlsson (1969, as Wilhelmia salopiensis [l only]). Beaucournu-Saguez (1972, as salopiense, Spain listed without locality), Beaucournu-Saguez (1975a), GonzaÂlez PenÄa et al. (1987), GonzaÂlez PenÄa (1990), GonzaÂlez (1997).

Andalusia records

Authors’ material. Site 3: 1 pupa. Site 7: 2 pupae, 3 larvae. Site 35: 6 pupae, 3 larvae. Site 44: 8m. Site 45: 5 pupae. Site 46: 1 pupa. Site 72: 34 pupae, 5 larvae. Site 73: 4 pupae, 4 larvae. Site 76: 1m (1), 6 pupae, 5 larvae. Site 79: 1 pupa, 4 larvae. Site 95: 3 pupae, 9 larvae. Site 98: 2 pupae, 2 larvae. Site 100: 14 pupae, 2 larvae. Site 104: 1 pupa, 3 larvae.

Other specimens seen. Granada: 1, l Orgiva , RõÂo Guadalfeo [VF68], 19.iv.1966 (Lyneborg and Langemark) ( ZMC) [ salopiensis in Carlsson, 1969]; 1m (pinned, terminalia on slide) ; Granada, 1± 7.vi.1925 (Zerny) ( BMNH) .

Previous reports. JaeÂn: RõÂo GuadalbulloÂn, 13 km S of JaeÂn [VG47] (ref. Beaucournu-Saguez, 1975a). MaÂlaga: RõÂo Guadalhorce at Archidona (UG7106) and at Cartama (UF5667) (refs GonzaÂlez PenÄa et al., 1987; GonzaÂlez PenÄa, 1990). (Also Carlsson, 1969: see data for specimens seen from ZMC).

Remarks

This species is widespread but not common in rivers at lower altitudes. It is possible to overlook its presence in routine sampling because it usually occurs intermixed in small numbers with the much more abundant S. pseudequinum and the diOEerence in the pupae is not always immediately obvious; in the latter species the central gill tubes are constricted and wrinkled where they join the gill base (®gure 49), whereas there is no basal constriction of these gill tubes in S. lineatum (®gure 51). DiOEerentiation of larvae is di cult unless the pupal gill histoblast is advanced or has reached pharate pupal stage, when removal and spreading of the incipient gill can show whether or not the central gill ®laments are basally constricted. For a note on the spermatheca see remarks under S. (W.) sergenti above.