Recently a flood occurred in a city (India) which is located near an estuary. Will these species be pure terrestrial gastropods, estuarine gastropods or marine gastropods. I am confused totally. But I found from an estuary mouth without meat (empty shell).
Looks like a frreshwater PLANORBIDAE speces, but i´m not so shure because of the caracteristics of the specimes, we need more details on this things... (I could say is Planorbula cf. armigera (... but it´s not shure))
Yambem:
Provide more details. Looks like a fresh water form washed into eustarine mouth?
Best
Syed
Yambem, it could be of the Ampullaridae family (presumably Marisa), this snail prefers places slow-moving freshwater with aquatic vegetation, although you can find it in some estuarine areas
Regards
Dr, Sayed,
I agree your point mentioned above. Thanks a lot. Really it is a freshwater gastropod. The description is matching with the species of Marisa.
Dr. Jorge,
I thank you for the species identification. I agree the point of Dr, Sayed.
I disagree. Although the photos are low resolution, and therefore it is hard to see, I am sure that these are shells of pulmonate land snails, not freshwater snails, and not marine snails. In addition I believe you have two different taxa here, not just one.
The second photo shows the umbilical side of the shells, which is clearly very different in shape from the dorsal side shown in the first photo. (In contrast, the shell of Marisa is planispiral, and looks similar on both sides.)
Is it possible to make better photographs showing more detail? And can you put a ruler in centimeters and millimeters next to the shells?
Thank you.
Yambem:
You must certainly be having several specimens to confirm or reject the points raised by Susan and provide more details: size. planispiral (involute or evolute).
Best
Syed
https://en.wikipedia.org/wiki/Marisa_cornuarietis
Dear Yambem Tenjing:
The shells seems to belong to the family Helicarionidae (land snails), possibly of the genera Ariophanta or Cryptozona (considering that that coin measures about 25 mm). A work which may be helpful is "A Systematic Revision of the Land Snails
of the Western Ghats of India" by Raheem et al. (2014).
Best regards,
Juan Francisco.
Yambem:
The guess work would go on. Therefore, you are advised to repeat your documentation, clearly showing views of both sides including aperture view of specimens. Your coin of 25mm diameter is adequate to determine size. Still, I tend to be skeptical and not sure about the land snail nature of your shells.
If Susan is so sure about pulmonate land snail nature of such shells, she should confidently identify Genus/Species.
Best
Syed
These do look like pulmonates but I agree that better orientated photographs are necessary and some close -ups showing sculpture,aperture and shell apex would be extremely useful.
Dear Yamben,
Your shell is a dead freshwater species. If you can send a bigger image with good resolution of an aperture view and dorsal view, would be helpful to find the species name.
I agree with Susan.
According to my identification, upper one is Macrochlamys indica and the lower one is Cryptozona bistrialis (both terrestrial Ariophantid snails). These relatively large snails can beeven be washed ashore thanks to their air filled tight coiled initial whorls.
Ariophanta is sinistral.
Marisa is huge, planispiral, thick shelled, with many thin stripes etc.
Hippeutis is much smaller, planispiral, flattened.
Indoplanorbis (of Planorbidae) which exist in your region is ramshorn shaped (lesser and rapidly expanding whorls).
Uemit:
You may be right in your guess in assessing the specific identifications of these shells but the conclusive evidence should come from much improved documentation in different views and sharp focus (Yambem to please note).
Best
Syed
Syed,
Lower one is a juvenile, so pretty much its all the same. But the one above is adult and ornamentation, frontal view plus actual size in mm would help indeed,
Ümit
These are terrestrial snails. I have some shells in our museum that were mistakenly kept along with marine collections.
Dr. Sameer,
That shell might have collected from estuary and creeks during raining season.
...........might be after flood occurred at that particular area.
These are clearly the land snails, 100%. Dr. Kebapçı may be right with identifications, but I would not be so sure. There are lots of very similar species of Macrochlamys and some ralated genera in India, same as several species of Cryptozona and some relatives (and this shell is juvenile).
Dr. Igor,
Thank you for the comment. I came to know that this sp. belongs to teresterial group.
If you send photos in better resolution, showing more detail, will be helpful.
cheers
Carlo
- Badges
- Science topic
- Similar topics
- Phytochemistry
- Extracts