Valovirta i (8 risultati)

Discriminant function analysis was used to develop a simple and practical formula for classification of a sample made up of two morphologically very similar species, Vitrea contracta and V. crystallina. By using three variables: number of whorls, breadth of the last whorl and height of the shell, a discrimination function was obtained which effectively discriminates between the problematic young specimens of these two species. Probability of misclassification of a small individual is 0.02. 6 pp., 4 figs, gr. 8.…

Specimens of Boettgerilla vermiformis Wiktor (Parmacellidae) were found in the Botanical Garden of the University of Helsinki in 1968 and 1969. These are the first records of the species from Finland. It is supposed that the specimens have been introduced with ornamental plants from Central Europe. The genitalia of B. vermiformis are described and some features of its ecology and distribution are discussed. 3 pp., 1 fig., gr. 8. …

9 pp., 3 figs, gr. 8.

4 pp., 1 fig. gr. 8.

Specimens of Milax gagates (Drap.) (Gastropoda) were found in a greenhouse in Vaasa, western Finland. This is the first record of this species and this genus in Finland. It is suggested that specimens may have been introduced with ornamental plants from Holland. The genitalia of M. gagates are described and some features of its ecology and distribution are discussed. 3 pp., 1 fig., gr. 8.…

Condizione: New. 376, col photos. 245x172mm. HB. NEW. . Text Finnish. A guide to the 94 species of terrestrial snails and slugs found in Finland. Detailed species descriptions. Includes information on natural history, habitats, reproduction and threats. Fine colour photos throughout, including living specimens in their natural habitats. [9789526754468].…