Richling i (20 resultados)

8pp,figs, illustrations, Printed Card Cover, VGC.

Laminated determination card, 4.

Die hier gezeigten 73 Arten stellen eine repr?sentative Auswahl der 400 mitteleurop?ischen Binnenmollusken dar. Laminated determination card.

Laminated determination card.

Deze kaart toont alle algemene en vele zeldzamere soorten. Laminated determination card.

3 pp., 7 figs, 4.

5 pp., 11 figs, 4.

Die Karte zeigt die wichtigsten S??wassermollusken und Nacktschnecken ?sterreichs Laminated determination card.

Deze kaart vevat alle landslakken van Nederland. Laminated determination card.

Laminated determination card.

Deze kaart bevart alle soorten die in Nederland voorkomen, met uitzondering van 3 slakjes die enkele malen in ondergronds water zijn gevonden. Laminated determination card.

20 pp., 17 figs, 4.

The bivalve molluscs collected in the Laptev Sea during the expeditions ARK IX/4 and Transdrift 1 as a Russian-German cooperation were studied. All the samples taken with a bottom dredge or an Agassiz-trawl from 43 stations covering the whole area were examined. The material contained 80094 specimens belonging to 62 species of bivalves, 4 species were recorded for the first time in the Laptev Sea area. 90 pp., 84 b/w figs, br. gr. 8.…

The mollusk fauna of the Rhine floodplain near H?rdt (Rhineland-Palatinate) ? a critical comparison after more than four decades Between 2008 and 2011 a survey of the mollusk fauna of the Rhine floodplain near Hordt focussing on the species listed in the annexes II and IV of the European Habitats Directive was conducted. Results were compared with investigations on the land snails and freshwater molluscs in the 1960th and 1970th. With about 1,500 single records and nearly 25,000 specimens collected from more than 60 sites the new survey yielded, among others, the first local records of the rare and endangered species Anisus vorticulus, Vertigo moulinsiana, Gyraulus riparius, and Pisidium pseudosphaerium and added significantly to the known list of species. Simple comparative analyses showed that especially the older aquatic assessments despite their own claim did not prove adequate to reveal faunal changes. Methodological deficiencies alone feasibly accounted for the differences observed. For this reason, with exception of Unio crassus, population trends could not be determined in the annex-species of the Habitats Directive either. Comprising a total of 133 species including four presumably locally extinct taxa, the area near Hordt probably is the floodplain with the highest diversity and concentration of endangered mollusk species in the entire Upper Rhine Valley. In total, 40 % of the species are either on the Red list of Germany or Rhineland-Palatinate, four of eight species in the category ?critically endangered? still survive in the area, another twelve species are ranked as ?endangered? The importance of the area as an inactive floodplain of excellent conservation status with its typical advanced succession stages is emphasized. The relative isolation of the area from the Rhine main stream guarantees the survival of many species by protecting them against the unnatural floodplain dynamics and fluctuating water quality. Anisus vorticulus is presented as indicator species for such conditions. 42 pp., 13 figs, 6 tabs, gr. 8.…

15) 0.0.

Exclusively available from ConchBooks as reprint this work is based on nearly 500 lots from 240 stations and deals with a revision of the 31 nominal helicinid taxa of New Caledonia, resulting in 17 endemic species accepted as valid, three of them new to science. Each species and its variability is shown in detail, also with SEM-pictures of apex and surface sculpture, anatomy and opercula. The distribution is shown in detailed maps. Also a key to the species is given. 130 pp., 253 (5 col.) figs, br. 4.…

285 pp., 340 figs, hardcover gr. 8 [18 x 26 cm] [with a dedication by the author to Wim Maassen].

130 p., 194 (5 col.) figs, 4to, paperbound. Mémoires du Muséum national d?Histoire naturelle.