1. Species online
  2. Small crustaceans in fresh waters
  3. Cladocera
  4. Macrothricidae Norman & Brady, 1867
  5. Drepanothrix

Drepanothrix dentata Baird

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Drepanothrix dentata has a carapace which is especially short and squat, and the edge protrudes in a peculiar thorn-like protuberance approximately in the middle dorsally. It is most common in lakes and seems quite tolerant with respect to pH and conductivity.

Key characteristics

: Drepanothrix dentata.
| G.O. Sars

Drepanothrix dentata (female)

Drepanothrix dentata has a carapace which is especially short and squat, and appears almost perfectly round. The edge protrudes in a peculiar thorn-like protuberance approximately in the middle dorsally. Seen from the side, its head is rather large, and, as in Acantholeberis curvirostris, it has a conspicuous, strongly protruding rostrum ventrally. Its postabdomen is very small, and its shape shows a very distinct approximation to that characterizing the genus Lathonura. The abdominal claw is difficult to see without dissecting the animal. D. dentata has a grey to yellowish/greenish colour. In the summer it can be more or less hyaline.

Female: Length 0.3–0.9 mm

Male: Length 0.4–0.7 mm

Ecology and distribution

D. dentata is a littoral species found in 2,5 % of the localities, which has a scattered distribution throughout the country. It is found from sea level to 1138 m a.s.l. and is most common in lakes. D. dentata seems to be quite tolerant to pH (4.6–7.7) and found both in electrolyte poor and electrolyte rich water.

    pH
    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 2,6 1,1 4,8 3,4 2,6 4,4 0,8
    Ledningsevne (m S/m)|Conductivity (m S/m)
    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
    0,7 1,9 3,2 2 3,8 1,9 4,1 6,5 1,8
    Innsjøareal (da)|Surface area (da)
    Vitenskapelig navn < 0,01 0,01 - 0,09 0,1 - 0,9 1,0 - 9,9 10,0 - 99 100 - 999 > 1000
    0 1 1,6 2,2 2,3 5,6 4,3
    Høyde over havet (moh.)|Elevation (m a.s.l.)
    Vitenskapelig navn < 100 100-299 300-499 500-699 700-999 >1000
    3,9 2,7 1,4 1,7 2,5 0,7