| Antillorbis nordestensis Temporal range: | |
|---|---|
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Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Superorder: | Hygrophila |
| Family: | Planorbidae |
| Genus: | Antillorbis |
| Species: | A. nordestensis |
| Binomial name | |
| Antillorbis nordestensis (Lucena, 1954) [1] | |
| Synonyms [1] | |
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Antillorbis nordestensis is an extant species of planorbid snail from South America. [1] It has a fossil record dating back around 680 years. [2]
The shell of Antillorbis nordestensis is about 5 mm (0.20 in) in width, with an aperture diameter of about 1.4 mm. The right side of the shell is more concave than the left. The ovotestes have between 10 and 25 diverticules, and the prostate gland has between 4–10. [3]
Antillorbis nordestensis can be found across much of South America, [4] including Brazil, [5] [6] Uruguay, and even as far south as Mascardi Lake in Argentina. [7]
This species is found more frequently in habitats with low concentrations of dissolved oxygen and low pH. [8] [9] It is found in shallow waters, [9] both stagnant and flowing. [2]
A. nordestensis may be found in low densities alongside other aquatic mollusks, including Pisidium taraguyense, Biomphalaria straminea, Biomphalaria peregrina , Musculium argentinum , and Drepanotrema heloicum . [8] [9] [10] Often, it is found in environments with dense aquatic vegetation, and is assumed to be herbivorous. [2] [8] [9] It may act as an intermediate host for macroderoidid trematode parasites. [5]
Fossils of Antillorbis nordestensis are known in very low quantities from the lower Salado Basin in Argentina. These fossils are very recent, from the late Holocene about 680 (±60) years ago. [2] 31 more fossils were also recovered from the broader Pampas region of Argentina from the late Holocene. [11]