Antillorbis nordestensis
| 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
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| Binomial name | |
| Antillorbis nordestensis (Lucena, 1954)[1]
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| Synonyms[1] | |
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Antillorbis nordestensis is an extant species of planorbid snail from South America.[1] It may be introduced in some areas, though it is unclear if it is invasive.[2] This species can host trematode parasites,[3] and has a fossil record dating back around 680 years.[4]
Taxonomy
Antillorbis nordestensis was described as Tropicorbis nordestensis by D. T. Lucena in 1954.[1]
Description
Shell
The shell of Antillorbis nordestensis is white, though its true color may be obscured by brown or black organic matter growing on it.[2] It is about 2.5 mm (0.098 in) in width on average, with a maximum diameter of around 5 mm.[2][5] The diameter of the aperture is about 1.4 mm.[5] The aperture is more oval-shaped than that of Antillorbis aeruginosus.[2] The umbilicus protrudes more on the right side of the shell, though both sides are still concave.[5][6] There are between 2–4 whorls, which quickly grow in width.[2][6] The sutures between the whorls are set deeply. The final whorl may be bent to the left or may be straight. There may be a very slight sculpture consisting of fine spiraling grooves, though its presence is not as prevalent as in A. aeruginosus.[2]
Reproductive Tract
The ovotestes have between 10 and 25 diverticules, and the prostate gland has between 4–10.[5] Two flagella attach to the base of the penis sheath. Compared to A. aeruginosus, the length of the penis sheath, flagella, and preputium of A. nordestensis are much shorter (294, 111, and 388 microns, respectively). This difference in size is irrespective of the age of the snail.[2]
Other Characteristics
The head and foot are light gray in color, while the mantle is only slightly colored.[2]
Distribution
Antillorbis nordestensis can be found across much of South America,[7] including Brazil,[3][8] Bolivia,[2] Uruguay, and even as far south as Mascardi Lake in Argentina.[9] It is unclear how much of this is its native range, and it is hypothesized to be introduced in Bolivia.[2]
Habitat
This species is found more frequently in habitats with low concentrations of dissolved oxygen and low pH.[10][11] It is found in both stagnant and flowing shallow waters, and is hypothesized to be able to aestivate when the water dries up.[4][2][11] In Bolivia, it lives in water temperatures between 3–28 °C (37–82 °F).[2]
Ecology
A. nordestensis may be found in low densities alongside other aquatic mollusks, including Pisidium taraguyense, Biomphalaria straminea, Biomphalaria peregrina, Musculium argentinum, and Drepanotrema heloicum.[10][11][12] Often, it is found in environments with dense aquatic vegetation, and is assumed to be herbivorous.[4][10][11] It may act as an intermediate host for macroderoidid trematode parasites.[3]
Fossil record
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.[4] 31 more fossils were also recovered from the broader Pampas region of Argentina from the late Holocene.[13]
References
- ^ a b c d Auffenberg, Kurt (2022). "Antillorbis nordestensis (Lucena, 1954)". WoRMS. World Register of Marine Species. Retrieved 24 August 2025.
- ^ a b c d e f g h i j k l Pointier, J. P.; Escoubeyrou, K.; Bargues, B. D.; Mas-Coma, S. (2001). "DREPANOTREMA NORDESTENSE (LUCENA, 1953) (PULMONATA: PLANORBIDAE): A NEW RECORD FOR THE BOLIVIAN ALTIPLANO AND ITS DIFFERENTIATION BY MORPHOLOGY AND ENZYMES". Journal of Molluscan Studies. 67: 7–16. doi:10.1093/mollus/67.1.7.
- ^ a b c Thiengo, Silvana C.; Mattos, Aline C.; Santos, Sonia B.; Fernandez, Monica A. (2006). "Freshwater snails and schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: VI - Noroeste Fluminense Mesoregion". Memórias do Instituto Oswaldo Cruz. 101 (1): 243–244. doi:10.1590/S0074-02762006000900037 – via SciELO.
- ^ a b c d Pisano, M. F.; Fucks, E. E. (2016). "Quaternary mollusc assemblages from the lower basin of Salado River, Buenos Aires Province: Their use as paleoenvironmental indicators". Quaternary International. 391: 100–111. doi:10.1016/j.quaint.2015.07.022.
- ^ a b c d Paraense, W. L. (1975). "ESTADO ATUAL DA SISTEMÁTICA DOS PLANORBÍDEOS BRASILEIROS". Archivos do Museu Nacional do Rio de Janeiro (in Brazilian Portuguese). 55: 124. ISSN 0365-4508. LCCN 05017782. OCLC 1307697.
- ^ a b Ovando, Ximena M. C.; Marchi, Giovanna F. (2021). "An annotated checklist of Planorbinae (Heterobranchia, Hygrophila, Planorbidae) from northwestern Argentina". Check List. 17 (6): 1497–1505. doi:10.15560/17.6.1493.
- ^ "Antillorbis nordestensis". Global Biodiversity Information Facility. Retrieved 2025-08-24.
- ^ Fernandez, Monica Ammon; de Mattos, Aline Carvalho; Da Silva, Elizangela Feitosa; dos Santos, Sonia Barbosa; Thiengo, Silvana Carvalho (2014). "A malacological survey in the Manso Power Plant, State of Mato Grosso, Brazil: new records of freshwater snails, including transmitters of schistosomiasis and exotic species". Revista da Sociedade Brasileira de Medicina Tropical. 47 (4): 504. doi:10.1590/0037-8682-0138-2014 – via SciELO.
- ^ Paraense, W. Lobato (2005). "Planorbidae, Lymnaeidae and Physidae of Argentina (Mollusca: Basommatophora)". Memórias do Instituto Oswaldo Cruz. 100 (5): 491. doi:10.1590/S0074-02762005000500008.
- ^ a b c César, I. I.; Martín, S. M.; Rumi, A.; Tassara, M. (2012). "Moluscos (Gastropoda e Bivalvia) da Reserva Natural de Usos Múltiplos Ilha Martín García, Rio de La Plata: biodiversidade e ecologia" [Mollusks (Gastropoda and Bivalvia) of the Multiple-Use Reserve Martín García Island, Río de la Plata River: biodiversity and ecology]. Brazilian Journal of Biology. 72 (1): 121–130. doi:10.1590/S1519-69842012000100014 – via SciELO.
- ^ a b c d Tietze, Eleonor; Cristini, Paula A.; Grondona, Sebastián I. (2019). "Mollusk communities differ between microenvironments within a shallow lake in the Pampean Region, Argentina". Ecología Austral. 29 (001–011): 4–9. doi:10.25260/EA.19.29.1.0.711.
- ^ de Lucía, Micaela; Darrigran, Gustavo; Gregoric, Diego Eduardo Gutiérrez (2023). "Diversity of non-marine mollusks in the southernmost Paranaense forest of the world". Anais da Academia Braileira de Ciencias. 95 (1) e20220212. doi:10.1590/0001-3765202320220212 – via SciELO.
- ^ Steffan, Pamela G.; Aguirre, Marina L.; Miquel, Sergio E. (2014). "MALACOFAUNA CONTINENTAL HOLOCENA (REGIÓN PAMPEANA, ARGENTINA)". Revista Brasileira de Paleontologia (in Spanish). 17 (2): 234–243. ISSN 1519-7530.