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What is Neelus sikkimensis?

Dec. 24, 2025

Scientists from the Zoological Survey of India (ZSI) recently discovered ‘Neelus sikkimensis’, the first of its genus in India, in the high-altitude region of Sikkim.

About Neelus sikkimensis:

  • It is a new species of Collembolatiny, soil-dwelling micro-arthropods.
  • It was discovered in the high-altitude landscapes of Sikkim.
  • It marks the first-ever record of the genus Neelus in India.
  • It brings the total number of known species under this genus worldwide to eight.
  • It exhibits several distinctive biological characteristics.
    • Microscopic Size: An extremely small body adapted for life deep within soil and moss.
    • Sensory Adaptation: A complete absence of eyes, typical of species living in dark, subterranean environments.
    • Unique Morphology: A specific “labral chaetotaxy” (arrangement of bristles on the mouthparts) that distinguishes it from its global relatives.

Key Facts about Arthropods:

  • Arthropods are invertebrates with jointed legs.
  • They make up about 75% of all animals on Earth and have a major role in maintaining ecosystems as pollinators, recyclers of nutrients, scavengers, and food for other animals.
  • They include many animals we come across in our gardens, such as spiders, ants, centipedes, and slaters.
  • Arthropods are divided into four major groups:
    • insects;
    • myriapods (including centipedes and millipedes);
    • arachnids (including spiders, mites, and scorpions);
    • crustaceans (including slaters, prawn, and crabs)

Key Facts about Collembola:

  • Collembola are among the most abundant and diverse soil microarthropods, which are found in almost all (semi) terrestrial environments.
  • They are among the oldest and most abundant hexapods on Earth and play a crucial role in soil health and nutrient cycling.
  • They are commonly known as “springtails,” because of their ability to jump using a tail-like appendage.
  • They live in all types of soil and feed on algae, fungi, plant roots, and decaying organic matter.

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