Zebra mussel cancer
| Zebra mussel cancer | ||||||||||||
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Back view of the zebra mussel crab ( Cypridopsis vidua ) |
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| Scientific name | ||||||||||||
| Cypridopsis vidua | ||||||||||||
| OV Müller , 1776 |
The zebra mussel crab ( Cypridopsis vidua ) is a mussel crab that is widespread in freshwater . It is also known as striped mussel cancer in German-language literature .
features
The zebra mussel cancer reaches a length of 0.6 to 0.7 millimeters. The two shell halves of the carapace are light yellow to light green. There are three to four dark bandages that pull vertically from the back over the bowls. The shape and color of these bandages are very variable, they can be green, lavender, purple or brown to black. The carapace, which envelops the entire body of the mussel crab, is egg-shaped. In height it measures about two thirds of the length. When viewed from the back, it is slightly wider than it is high at the widest point. From the side a small indentation of the lower edge of the shell flaps can be seen. The left flap protrudes slightly over the right, so that the carapace can be closed like a box with a lid. The shell flaps are hairy, the longest hairs are on the outer edge of the two flaps.
The swimming bristles of the two pairs of antennas used for locomotion are well developed and extend beyond the claws of the end links.
The furca consists of only one trunk with a longer flagellum. The outer branch of the first thoracopod bears five sets (bristles).
distribution
The zebra mussel crabs are widespread worldwide and occur in all kinds of freshwater. They are most often found as a summer form in stagnant waters that do not dry out .
Way of life
Only females are known of the zebra mussel cancer. They reproduce asexually via permanent eggs. Over various larval stages, these mussel crabs develop into adult females that produce permanent eggs.
Taxonomy
The zebra mussel crab was first described by Otto Friedrich Müller in 1776 as Cypris vidua .
Individual evidence
- ↑ a b c d Heinz Streble, Dieter Krauter: Life in the water drop. Microflora and microfauna of freshwater. An identification book. 12th edition. Kosmos, Stuttgart 2010, ISBN 978-3-440-12634-9 , pp. 324-325.
- ↑ Robin James Smith: Cypridopsis vidua ( Memento of the original from May 19, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , Ostracod research at the Lake Biwa Museum, Japan, accessed June 26, 2014
- ^ A b Robert V. Kiesling: The morphology of ostracod molt stages. Illinois biological monographs, 21, 1-3, University of Illinois Press, Urbana 1951, pp. 2-3
literature
- Heinz Streble , Dieter Krauter : Life in a drop of water. Microflora and microfauna of freshwater. An identification book. 12th edition. Kosmos, Stuttgart 2010, ISBN 978-3-440-12634-9 , pp. 324-325.
- Robert V. Kiesling: The morphology of ostracod molt stages. Illinois biological monographs, 21, 1-3, University of Illinois Press, Urbana 1951, pp. 2-3
Web links
- SN Brandão: Cypridopsis vidua (OF Muller) . In: SN Brandão, MV Angel, I. Karanovic: World Ostracoda Database . World Register of Marine Species, 2014, accessed June 25, 2014