Pseudostomella andamanica   Rao,  1993 (Gastrotrich)
Organism information awaits expert curation

Size: Length 0.5 mm and a maximum width of 65 µm in extended condition.

The body is well elongated and dorsoventrally flattened, with almost uniform width all along the body. There is a dorsal covering of 4-pronged scales or tetrancres, excepting a little part on the anterior head region. The scales are quite small and arranged in 10-12 longitudinal rows. No scales could be observed on the ventral surface. The organization of the cephalic net in the prebuccal region comprises 7 dorsal and 6 ventral papillae, each papilla supporting a vibratile bristle at the distal end. The cephalic appendages attain a length of about 70 µm and each bears 2 pairs of sensory cilia on elevated knobs on the outer side.
The adhesive tubes occur as usual in three paired series. Two pairs of anterior tubes occur on ventral surface of head just behind the mouth. There are 8 pairs of lateral tubes disposed more or less at equal distance from each other. The lateral tubes start just behind the head and extend close to the posterior end. Two pedicles of the usual shape occur on the posterior border, each bearing 3 apical tubes 8-12 µm long and an inner tube 8 µm long situated close to the base. No adhesive tubes occur on the posterior border between the two pedicles.
Epidermis contains 6 pairs of well developed dorsolateral glands. Ventral glands are not seen. Ventral surface of body has a uniform covering of cilia. Mouth is spacious, terminal and inclined to the ventral surface. The pharynx occupies nearly 1/3rd of the total gut length. Pharyngeal pores occur close to the posterior end of pharynx. The gut following pharynx is undifferentiated and tapers to the posterior end. Anus is subterminal.

The unpaired testis is situated on the second half of body lying close to the digestive tract. Ovaries lie to the opposite side of testis. The seminal receptacle and bursa copulatrix lie close to the intestine in the last quarter of body. The male and female genital pores open on ventral surface close to the anus.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Habitat:  Demersal, Sandy, Coastal


• Andaman and Nicobar Islands, Dugong Creek INDIA (Record: 24/03/1990) (Depth: 0.1 mts)
• Andaman and Nicobar Islands, Dugong Creek INDIA
• Kerala, Cherai Beach INDIA (Depth: 0.17 mts)

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Rao, GC (1993) Littoral meiofauna of Little Andaman Records of the Zoological Survey of India. Occasional paper no. 155 ZSI, Calcutta 120 pp Available at - NIO, Goa
  • Priyalakshmi, G and Menon, NR (2008) Indian marine Gastrotricha Available at -
  • Sealifebase Available at -
  • Menon, NR; Priyalakshmi, G and Todaro, MA (2007) A new species of Pseudostomella (Gastrotricha: Macrodasyida: Thaumastodermatidae) from a sandy beach of Kerala, India Zootaxa Magnolia Press 1616 61–68 Available at -

Page last updated on:2010-12-27

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