By W. J. Harman (auth.), Ralph O. Brinkhurst, David G. Cook (eds.)

After a few conversations with Professor Dr. H. Caspers and different individuals on the triennial congress of the overseas organization of Theoretical and utilized Limnology (S. I. L. ) held in Copenhagen, Denmark (1977), the senior editor approached the overseas delegates on the enterprise assembly for approval of the concept that of conserving the 1st foreign Symposium on Aquatic Oligochaete Biology at Sidney (near Victoria) British Columbia on may possibly 1-4, 1979. The S. I. L. agreed to sponsor one of these assembly, and this sponsorship in flip ended in the supply of house and technical amenities on the Institute of Ocean Sciences Patricia Bay, the Pacific neighborhood headquarters of the sea and Aquatic Sciences portion of the federal Fisheri~s and Oceans division. The nationwide learn Council of Canada supplied go back and forth aid for a few non-Canadian contributors. invites have been despatched to as many energetic employees within the box because the senior editor might identify, and also representatives of heavily allied fields have been invited - Dr. V. Standen who works with heavily similar yet terrestrial species, and Dr. J. Grassle who works with polychaetes yet specially with Capitella capitata that's very like an oligochaete in a few facets of its biolog- rather a lot in order that the senior editor in his salad days succumbed to a couple ill-founded suggestion and defined Capitella as a brand new marine tubificid! The addition of those "outside" impacts avoided the crowd from creating a variety of unfounded assumptions in the course of discussions, and supplied important cross-linkages.

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S. LODEN AND W. J. HARMAN minor, taxonomic considerations. Reliance on chaetotaxy has resulted in considerable subjectivity among authors; Pop (1973) discussed this subjectivity in his description of Pristina napocensis, one of a group of species whose differences are based almost entirely on rather fine aspects of setal form. g. Sperber, 1948; Brinkhurst, 1971), but they were unable to demonstrate its occurrence. Pristina aequiseta Bourne is characterized by setae in the ventral bundles of segments IV, V, or both, that are thicker and longer than other ventral setae.

Hoffmeisteri. INTRODUCTION Species of Limnodrilus are distinguished primarily by the shape of the penis tube and the configuration of the head at the distal end of the tube. For instance, the head of the penis tube of L. hoffmeisteri is variable in shape but typically resembles a hood draped over one side of the tube (Figure la). L. claparedeianus has a noticeably longer tube and a triangular or pearshaped head which is attached to the tube at a slant (Figure lb). Variant forms of Limnodrilus are common in many ecosystems in North America.

Genus Allonais and most of the species of Aulophorus) to the temperate zone. In general, the common temperate zone species of the Tubificidae, Naididae, Lumbriculidae and Enchytraeidae successfully populate spring brooks or bottoms of northern lakes where the temperature of water never exceeds +4 0 C. Many species of DISTRIBUTION OF AQUATIC OLIGOCHAETES 59 Haplotaxidae, Lumbriculidae and even Tubificidae are specific for permanently cool phreatic water. The giant Lake Baikal, in which the surface never warms up over 10 or 120 C, is populated by an oligochaete fauna rich in species.

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