Redescription of the type-material of creptotrema creptotrema travassos, Artigas & Pereira, 1928 (Digenea, Allocreadiidae)

Creptotrema creptotrema Travassos, Artigas & Pereira, 1928, a digenetic trematode parasite of Leporinus elongatus, is redescribed from the type-material with additional morphological data and original figures.

Population biology of Allocreadium lobatum Wallin, 1909 (Digenea: Allocreadiidae) in the creek chub, Semotilus atromaculatus, mitchill (Osteichthyes: Cyprinadae), in a Nebraska Creek, USA

Allocreadium lobatum Wallin, 1909 has been reported in cyprinid species of freshwater fish in Canada and in the United States. The population biology of A. lobatum in the host Semotilus atromaculatus Mitchill was studied from May through December 1991, in a USA creek. Overall prevalence (64%) and mean intensity (4.4 ± 0.4) were greater than previously reported while abundance, reported for the first time, was 2.8 ± 0.3. Several trends in A. lobatum population biology as a function of S. atromaculatus length were identified. Mean intensity and abundance of A. lobatum increased with host size and significant differences in prevalence and A. lobatum lengths were found to correlate with host lengths.

A redescription of Homalometron senegalense Fischthal & Thomas, 1972 (Digenea : Apocreadiidae) from Synaptura kleinii (Teleostei) of the western Mediterranean

The apocreadiid digenean Homalometron senegalense is redescribed from the soleid fish Synaptura kleinii from off Corsica in the western Mediterranean. For the first time, lymphatic vessels are described for this species, and the implications of this in the systematics of the Apocreadiidae discussed. This species is considered closest to H. galaicus and H. wrightae, both also reported from soleid hosts. The concept of Apocreadiidae espoused is that most recently developed by Cribb & Bray (1999).