Acanthodiaptomus tibetanus
Acanthodiaptomus tibetanus is a large and rather robust calanoid where adult females are easy to identify because an asymmetric appearance of the last thorax segment.
Key characteristics
A. tibetanus is a large and rather robust calanoid, first time described by Daday (1908) from Tibet. Adult females of A. tibetanus can not be mixed up with any other species because of the asymmetric appearance of the last thorax segment. On both sides this segment is laterally prolonged in two very conspicuous extant lobes.
Female: Length unknown
Male: Length unknown
Ecology and distribution
This species was first identified in material from the northeast of Norway (Varanger peninsula). Today there are records from a number of lake. Except one record, all are found in county Finnmark (8–260 m a.s.l.). The last record is from the eastern part of south Norway (1118 m a.s.l.). Data on chemistry is missing but the lakes can be described as electrolyte poor and have pH close to neutral.
| Vitenskapelig navn | < 4,5 | 4,5 - 4,9 | 5,0 - 5,4 | 5,5 - 5,9 | 6,0 - 6,4 | 6,5 - 7,0 | 7,0 - 7,4 | > 7,5 |
|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0,2 | 0 | 0 |
| Vitenskapelig navn | < 1,0 | 1,0 - 1,4 | 1,5 - 1,9 | 2,0 - 2,9 | 3,0 - 3,9 | 4,0 - 4,9 | 5,0 - 6,9 | 7,0 - 9,9 | > 10,0 |
|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0,4 | 0 | 0 | 0 | 0 | 0 |
| Vitenskapelig navn | < 0,01 | 0,01 - 0,09 | 0,1 - 0,9 | 1,0 - 9,9 | 10,0 - 99 | 100 - 999 | > 1000 |
|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0,4 | 0,2 | 0 |
| Vitenskapelig navn | < 100 | 100-299 | 300-499 | 500-699 | 700-999 | >1000 |
|---|---|---|---|---|---|---|
| 0,2 | 0,3 | 0 | 0 | 0 | 0,5 |