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Table 1 in New species of Georissa (Gastropoda: Hydrocenidae) and Acmella (Gastropoda: Assimineidae), with new records of Georissa from Northeast India
Authors/Creators
- 1. SM Sehgal Foundation Centre for Biodiversity and Conservation, Ashoka Trust for Research in Ecology and the Environment (ATREE), Royal Enclave, Sriramapura, Jakkur PO, Bangalore 560064, India. & Manipal Academy of Higher Education (MAHE), Madhav Nagar, Manipal, Udupi 576104, India. & Department of Zoology, Kamrup College, Chamata, Nalbari, 781306, Assam, India.
- 2. SM Sehgal Foundation Centre for Biodiversity and Conservation, Ashoka Trust for Research in Ecology and the Environment (ATREE), Royal Enclave, Sriramapura, Jakkur PO, Bangalore 560064, India. & Manipal Academy of Higher Education (MAHE), Madhav Nagar, Manipal, Udupi 576104, India. & Yenepoya Research Centre, Yenepoya (Deemed to be University), University Road, Derlakatte, Mangalore 575018, India.
Description
Table 1 (continued on next two pages). Comparison of conchological characters of all species of Georissa W.T. Blanford, 1864 from India and Myanmar (adopted from Das & Aravind 2021).
| Characters | G. meghalayaensis sp. nov. | Georissa sp. | G. mawsmaiensis Das & Aravind, 2021 | G. saritta W.H. Benson, 1851 | G. liratula Stoliczka, 1871 | G. illex W.H. Benson, 1856 | G. pyxis W.H. Benson, 1856 | G. fraterna Theobald & Stoliczka, 1872 | G. frustrillum W.H. Benson, 1860 | G. rawesiana W.H. Benson, 1860 | G. blanfordiana Stoliczka, 1871 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Size (SH × SW) (in mm) | 1.91× 1.56 | 1.98–2.05× 1.53–1.63 | 1.82×1.42 | 2 ×1.25 | 2.2 ×1.8 (Maj), 2.2 × 1.5 (Min) | 2.65× 1.65 | 1.5 × 1.25 | 1.4 × 0.95 | 2.5 ×1.75 | 2 ×1.5 | 1.8× 1.2(Maj), 1.8 × 1 (min) |
| Shell shape | oval, turbinate | oval, turbinate | ovate-conical | ovate-conical | globose-conical, solid | ovate-sharp, succineous | ovate-conical | cylindrical, conoid, solid | ovate-elongated, solid | almost globose-conical, more slender than G. liratula | globose-conoid, moderately solid |
| Color | dark brownish | amber | amber | reddish-white with a rusty tint | yellow | translucent, reddish-brownish towards spire | translucent, reddish towards the spire | pale, yellow-green | translucent, amber-colored (?) | yellowish-white | yellowish, apex reddish |
| Liration | multilirate, meshed pattern | multilirate | multilirate | multilirate | multilirate, a little more numerously spirally ribbed than G. sarrita | multilirate | multilirate | multilirate | multilirate | multilirate | – |
| Sculpture | spiral ribs present, somewhat strong, very densely arranged, and around regularly spaced, sometimes distorted by radial ribs or growth lines, radial ribs present, irregular and weakly sculptured across the shell | spiral ribs present, strong, somewhat closely arranged, and nearly regularly spaced across shell except protoconch, somewhat fine or less sharp and more densely spaced spiral striations on basal part of body whorl (umbilical view), radial ribs absent | strong, spirally striated whorls | numerous close spiral ridges separated by narrow grooves | spirally lirate with sharp, simple, closely equidistant ribs | very finely striated, spirally closely and delicately lined | – | spirally coarsely lirate | very closely spaced spiral striations | closely spirally striated | very fine transverse growth striae, somewhat polished |
| Umbilicus | narrow | narrow | imperforate | sub imperforate, covered by thickened callus | imperforate | scarcely perforate | perforate | imperforate, with umbilical region slightly impressed | imperforate | imperforate, umbilical region slightly depressed | imperforate |
| Whorls | 3.5, convex | 3.5, convex | 3.62, convex | 4, very convex | 3–3.5, convex | 4, very convex | 4, convex | 3.5, convex, somewhat flattened above | 5, convex | 4, very convex | 3.5, somewhat convex |
| Spiral striae/ ribs from suture to aperture (in apertural view) | 7–9 | 6–9 | 4 | 7 | 5 | 6 | 5 | 8 | 6 | much finer spiral striation, 7–8 | nil, no spiral ribs; longitudinal ribs are present |
| Spire | acuminate | acuminate | conical | conical | conical | shining, elongate-conical | conical | conical | sub pyramidal | conical | subacute |
| Apex | blunt, roundish | blunt, roundish | blunt, roundish | obtuse or blunt, reddish | subobtuse, forming slightly prominent mammillate tip, smooth, yellow actually reddening | slightly obtuse | obtuse | strongly mammillate | obtuse | obtuse or blunt | reddish, nipple like, very smooth |
| Suture | well-impressed | well-impressed, with narrow shoulder | well-impressed | well-impressed | deep, simple | deep | deep | very deep | impressed | deep | – |
| Aperture | ovate, oblique or sub-vertical | round or slightly ovate, oblique or sub-vertical | sub-circular | hardly oblique, ovate, equaling ⅔ of shell’s length, columellar margin angular above, with callous inner wall | semilunar, nearly equaling height of spire, somewhat dilated | oblique, ovate, angular above | oblique, semicircular, columellar margin expanded and somewhat reflexed | almost semi circular | oblique, truncated-ovate, angled at upper left side | slightly oblique, semicircular, angled at upper left side | broadly semicircular |
Notes
Published as part of Das, Nipu Kumar & Aravind, Neelavar Ananthram, 2026, New species of Georissa (Gastropoda: Hydrocenidae) and Acmella (Gastropoda: Assimineidae), with new records of Georissa from Northeast India, pp. 9-10 in European Journal of Taxonomy 1060 on page 9, DOI: 10.5852/ejt.2026.1060.3284, http://zenodo.org/record/20411389
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Additional details
Identifiers
References
- Blanford W. T. 1864. On the classification of the Cyclostomacea of eastern Asia. Annals and Magazine of Natural History, Series 3 13 (78): 441-465. Available from https://www.biodiversitylibrary.org/page/22217703 [accessed 4 Apr. 2026].
- Das N. K. & Aravind N. A. 2021. A new species from the genus Georissa Blanford, 1864 (Gastropoda, Neritimorpha, Hydrocenidae) from a limestone cave of Meghalaya, Northeast India. Journal of Conchology 44 (2): 93-101.
- Benson W. H. 1851. Geographical notices, and characters of fourteen new species of Cyclostoma, from the East Indies. Annals and Magazine of Natural History, Series 2 8 (45): 184-195. Available from https://www.biodiversitylibrary.org/page/22250400 [accessed 4 Apr. 2026].
- Stoliczka F. 1871. Notes on terrestrial Mollusca from the neighbourhood of Moulmein (Tenasserim Provinces), with descriptions of new species. Journal of the Asiatic Society of Bengal, Part II 40 (2): 143-177. Available from https://biodiversitylibrary.org/page/35630965 [accessed 4 Apr. 2026].
- Benson W. H. 1856. Characters of seventeen new forms of the Cyclostomacea from the British Provinces of Burmah, collected by W. Theobald, jun., Esq. Annals and Magazine of Natural History, Series 2 17 (99): 225 - 228 [1 March]; 17 (100): 229-233 [1 April]. Available from https://biodiversitylibrary.org/page/22069820 [accessed 4 Apr. 2026].
- Theobald W. & Stoliczka F. 1872. Notes on Barmese and Arakanese land shells, with descriptions of a few species. Journal of the Asiatic Society of Bengal 41 (2): 329-334. Available from https://www.biodiversitylibrary.org/page/37138045 [accessed 4 Apr. 2026].
- Benson W. H. 1860. Characters of new land-shells from Burmah and the Andamans. Annals and Magazine of Natural History, Series 3 6 (33): 190-195. Available from https://www.biodiversitylibrary.org/page/2267380 [accessed 4 Apr. 2026].