File:Daphnia Ephippia.jpg
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Summary
| Description |
Eesti: Fotol on näha kiivrik perekonda kuuluva vesikirbu püsimuna. Püsimunad on munad mis tekkivad kui veekogus elutingimused halvenevad, nt tuleb talv. Kirbud moodustavad püsimunad ja need lastakse veekogu põhja, need võivad seal olla aastakümneid või isegi aastasadu, kui elutingimused paranevad, tõusevad munad pinnale ja nendest kooruvad uued kirbud.
English: Ephippia (singular: ephippium) are winter or dry-season eggs of the various species of small crustacean in the order Cladocera (within the Branchiopoda); they are provided with an extra shell layer, which preserves and protects the resting stages inside from harsh environmental conditions until the more favorable times, such as spring, when the reproductive cycle is able to take place once again. Ephippia are part of the back of a mother carrying them until they are fully developed. After molting, the ephippium stays in the water, or in the soil of dried puddles, small ponds, and vernal pools. The resting stages are often called eggs, but are in fact embryos with arrested development. Ephippia can rest for many years before the embryo resumes development upon an appropriate hatching stimulus. |
| Date | |
| Source | Own work |
| Author | Janeklass |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:07, 19 November 2023 | | 5,160 × 3,434 (7.4 MB) | Janeklass | Uploaded own work with UploadWizard |
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