Crinolina isefiordensis
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| Crinolina isefiordensis | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Clade: | Amorphea |
| Class: | Choanoflagellata |
| Order: | Acanthoecida |
| Family: | Acanthoecidae |
| Genus: | Crinolina |
| Species: | C. isefiordensis |
| Binomial name | |
| Crinolina isefiordensis Thomsen, 1976 | |
Crinolina isefiordensis is a species of choanoflagellate in the family Acanthoecidae. It is the type species of the genus Crinolina[1] and is named for the first location of its collection, the Ise Fjord in Denmark.
Crinolina isefiordensis is a single-celled organism that lives in a skirt-shaped lorica (net-like structure) which is open on both ends. The protoplast of the type specimen measured 8 microns by 5 microns and it does not have a chloroplast. It has a flagellum between 2-3 times as long as the protoplasts which is ringed by a collar of tentacles inside the lorica. The lorica is even longer, up to 30 microns, and is twice as wide at the base as the neck. The lorica consists of around a dozen costae (filaments that create the exoskeleton) which are roughly straight and connect the costal rings at the base and neck. Each costa is made up of six or seven small strips that are joined. At the neck of the lorica, these costae end in spines that project outwards.[2]
The lorica of C. isefiordensis is highly similar in appearance to that of Diaphanoeca grandis in its structure. However, the main difference is that C. isefiordensis entirely lacks a membrane to connect the costae of the lorica, unlike D. grandis. Additionally, the flagellum of C. isefiordensis is usually seen curled up in a pig-tail shape, a characteristic unique to the species.[3]
There is some minor morphological variance across populations of C. isefiordensis. Most notably, warmer water populations tend to have fewer costae and less apparent spines.[3]