A new species ofCrepidostomum(Allocreadiidae: Digenea) from northeastern Finland, with comments on its possible origin
✍ Scribed by David I. Gibson; E. Tellervo Valtonen
- Book ID
- 104653553
- Publisher
- Springer Netherlands
- Year
- 1988
- Tongue
- English
- Weight
- 776 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0165-5752
No coin nor oath required. For personal study only.
✦ Synopsis
Crepidostomum wikgreni n. sp. is described from the gall-bladder and intestine of the whitefish Coregonus acronius in Lake Yli-Kitka in NE Finland. It is morphologically similar to Cfepidostomum farionis, with which it occurs sympatrically and sometimes concurrently; but it differs in that the eggs are much larger, i.e. 96+ 6.5/zm mean-length, as opposed to 71 +4.7/~m mean-length for C. farionis in the same host and locality.
It is suggested that the new species has arisen from C. farionis after deglaciation and since c. 8,400 BP, at which time the waters of the Lake Kitka System were isolated from those in the rest of Finland and flowed eastwards into the White Sea Basin. The isolation of the White Sea Basin appears to have been maintained by watersheds running north-south close to the Fenno-Soviet border and east-west through central Karelia. It is further suggested that C. farionis currently occurring in Lake Yli-Kitka is a recent re-introduction brought about by the translocation of fish-stocks.