It is different from other Turritella species like Turritella duplicata, T. terebra and T. radula.
Yambem:
Could you please give some details regarding its region of collection and whether collected live or dead shells. Thanks.
Best
Syed
Dear Sir, this was collected from sandy shore, south east coast of India. It was dead when I collected. I collected slightly away from some river mouth. Last month here was a severe flood.in our city. From the heart of city the sampling site is around 15/20 km distance.
Yambem:
Thanks for the information. There are limited number of Turritella species known from Eastern Indian waters and your specimens differ in subtle ways from common Turritella duplicata (Linne). I suspect that you may be dealing with a closely allied new species.
You may also like to have a look at the link:
http://faunaofindia.nic.in/PDFVolumes/records/113/02/0123-0136.pdf
Best
Syed
Turritella species found on west & east coast of India. You may get earlier reports which will be helpful to confirm identification.
Dear Dr. Tenjing,
your specimen looks mostly like the young adults of Turritella duplicata (Linnaeus, 1758). The prominent radial rings and the stairway teleoconch also are characteristic of this species. The adults measure 85-150 mm and your specimen seems to be around 35 mm??
T. radula is narrower and has scattered markings while T. terebra tapers narrowly with more whorls
Regards
Deepak
Deepak:
What do we understand by "young adults"? Illustrated specimens have ca 14 whorls and are ca 40mm in length. In typical specimens of T. duplicata, there are 14-20 whorls and size reaches upto 107mm. After six whorls the central ridge becomes elevated into a strong keel (which we don't see in the specimens illustrated here). Please make your judgement!
Best
Syed
Dear Dr Jafar,
an intermediate stage between the juvenile and adult is a young adult stage (resembling the adult, small but no maturation). Some examples include
Molluscs as Crop Pests - edited by G. M. Barker - p.69 - for terrestrial snails
Sea Snails: A natural history - By Joseph Heller - p 9 - para 2 - for marine molluscs
there are many more publications that explain about young adults.
As for the specimen here you have precisely pointed out that the whorls are 14-20 (the larger specimen).
I forgot to add about the 2 acute spiral ridges (keels) on each whorl though for T. duplicata, in which one is prominent and the other is weaker (there are more radial keels minute in appearance too) but for this specimen there in 1 prominent keel throughout the whorls in the spire. The character of having 2 keels is prominent in the last whorl of the specimen inner view of aperture.
The document shared by you also has 2 keels in the whorls for T. duplicata.
But yes, all said and done, the whorls are minute and more in the specimen here which requires further research. It was just an opinion from my side that it can be T. duplicata because of the characteristic 2 keel arrangement.
Best regards
Deepak
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