Three new anatomically remarkable Turbellaria Eukalyptorhynchia from the north American Pacific coast

The heterogeneity of the turbellarian family Polycystididae is demonstrated by describing three new aberrant species of this family from the Pacific coast of USA. The new subfamily Duplacrorhynchinae is based on the new genera, Duplacrorhynchus with two species and Yaquinaia with one species. A further splitting up of the family appears to be inevitable in the future

Anatomy and taxonomy of some species of Polycystididae (Turbellaria, Kalyptorhynchia) from N. Atlantic and Mediterranean coastal areas

Acrorhynchides styliferus sp. n. from Norway and the British Isles and Polycystis contorta sp. n. and Typhlopolycystis coomansi sp. n. from Norway and the Mediterranean are described. Additional notes are given on the anatomy and distribution of Paracrorhynchus bergensis Karling. Polycystis groenlandica (Levinsen), P. crocea (Fabricius) and Typhlopolycystis mediterranea Brunet. The taxonomy of the species and the corresponding genera is discussed

Anatomy and systematics of some Polycystididae (Turbellaria, Kalyptorhynchia) from the Pacific and S. Atlantic

Paraustrorhynchus gen. n., P. pacificus (California), Antiboreorhynchus novzelae sp. n. (New Zealand) and Gyratrix proaviformis sp. n. (Oregon) are described as new taxa. Additional notes are given on Gyratrix hermaphroditus Ehrbg. (new localities on the N. American Pacific coast), Scanorhynchus forcipatus Karling (new locality in California), Paraustrorhynchus elixus (Marcus) comb. n. and Alcha evelinae Marcus (new localities in California). The taxonomy of the genera and species is discussed. Viewpoints are presented on evolutionary trends and homologous atrial organs in the family Polycystididae