Why In News?

Researchers identified Dicharax tilariensis, a new species of microscopic land snail in Maharashtra. 

What Is Dicharax Tilariensis?

  • Classification: It is a microscopic, terrestrial, shell-bearing snail belonging to the genus Dicharax, family Cyclophoridae, and subfamily Alycaeinae.  

  • Discovery Location: Researchers collected specimens from Tilari Nagar, near Swapnavel Point, in Kolhapur district, Maharashtra.

  • Geographical Range: It is currently known only from this locality, at approximately 700–800 metres above sea level. Its restricted known distribution makes it a locally endemic species.  

  • Habitat: It inhabits semi-evergreen forests, particularly moist microhabitats containing forest litter, decaying organic matter and damp soil.

  • Taxonomic Significance: It represents the second endemic species of the genus Dicharax described from the northern Western Ghats.

Physical Features 

  • Shell Colour: Whitish, with a pinkish or brownish tinge.

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  • Shell Dimensions: Approximately 4.21–4.87 mm wide and 3.01–3.52 mm high.

  • Elevated Spire: Its shell has a distinct elevated spire.

  • Rib Patterns: It displays characteristic shell ribs, with differences in their arrangement and spacing across shell regions.

  • Sharp Swelling: A distinctive sharp swelling on the shell helps distinguish it from closely related species.

  • Operculum: Its shell-closing structure has a prominent nipple-like projection on the inner surface.  

How Do Snails Contribute to Ecosystems?

  • Nutrient Cycling: Snails feed on organic matter and contribute to the breakdown and recycling of nutrients within forest ecosystems.

  • Food Web Support: They serve as food for several forest-dwelling invertebrates and vertebrates.

  • Environmental Indicators: Their dependence on moisture and specific microhabitats makes land snails useful indicators of changes in forest-floor conditions.

  • Habitat Sensitivity: Changes in canopy cover, soil moisture and leaf-litter availability can affect the survival of specialised land-snail species. 

Source: TIMESOFINDIA

PRACTICE QUESTION

Q1. With reference to Dicharax tilariensis, consider the following statements:

  1. It is a microscopic terrestrial snail belonging to the family Cyclophoridae.

  2. It was discovered in the Eastern Ghats.

  3. It is currently known only from the Tilari region.

Which of the statements given above is/are correct?

(a) 1 and 2 only

(b) 1 and 3 only

(c) 2 and 3 only

(d) 1, 2 and 3

Answer: (b) 1 and 3 only

Explanation:

Statement 1 is correct: Dicharax tilariensis is a newly described microscopic terrestrial (land) snail measuring less than 5 mm, classified under the family Cyclophoridae (subfamily Alycaeinae).

Statement 2 is incorrect: It was discovered in the northern Western Ghats (specifically in the Tilari region of Kolhapur district, Maharashtra), not the Eastern Ghats.

Statement 3 is correct: The species is endemic to this specific habitat and is currently known only from the Tilari region of the northern Western Ghats.