Macrodasys indica   Rao,  1991 (Gastrotrich)
Organism information awaits expert curation

Size: Length upto 0.90 mm and width 0.12 mm.

Body is transparent and dorsoventrally flattened. The anterior end is bluntly rounded without any projections, while the posterior end tapers into a pointed tail 0.15 mm in length. Head is not delineated from trunk and bears a pair of lateral pestle organs. Epidermis is finely granular with several rows of dorsolateral epidermal glands 3 – 5 µm in diameter. Fine cilia 10 – 12 µm long occur along the anterior border of head and lateral margins of the trunk. Ciliation forms a continuous field on the ventral surface.

Anterior tubes about 10 µm long occur in two groups of 2+6 on either side in an arc on the ventral surface of head just behind the mouth. Eight pairs of lateral tubes about 15 µm in length occur beginning about the posterior end of pharynx. Six pairs of posterior tubes occur on the lateral surface of tail and are distinctly separated from the lateral tubes of the trunk. They reach 6 – 12 µm in length, their size decreasing steadily to the posterior end. The mouth is terminal, cup-shaped and the oral cavity has a velum characteristic of the genus. The pharynx is about 260 µm long and occupies nearly 2/5 of the total gut length. The gut following the pharynx is undifferentiated and tapers to the posterior end. Anus is subterminal and opens on the ventral surface about 30 µm from the base of tail.

The reproductive organs consist of a paired testis located laterally along anterior region of the intestine. Vasa deferentia terminate close to the penis. The penis is pitcher-shaped, about 80 µm, located posterior to the ovary and opens anteriorly on the ventral body surface. Bursa copulatrix is about 200 µm long, with conspicuous muscular and vermiform portions. The bursa opens posteriorly into a distinct antrum feminum.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Habitat:  Sandy, Coastal


• Lakshadweep, Minicoy (Lat: 8.28) (Long: 73.06) INDIA (Record: 15/03/1983, 16/03/1983) (Depth: 0.05 mts)
• Lakshadweep, Minicoy INDIA

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Rao, GC (1991) Meiofauna State fauna series 2: Fauna of Lakshadweep ZSI, Calcutta 41-135 Available at - NIO, Goa
  • Priyalakshmi, G and Menon, NR (2008) Indian marine Gastrotricha Available at -

Page last updated on:2010-11-22

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