Tetranchyroderma tentaculata   Chandrasekara Rao,  1993 (Gastrotrich)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Gastrotricha
Class:
Order:Macrodasyida
Family:Thaumastodermatidae

Description
Size: Maximum length 360 µm and width 80 µm.

Body dorsoventrally flattened and contractile. Head distinct, truncate anteriorly, with a narrow neck and a wide trunk tapering posteriorly. Pestle organs absent. Head bears a pair of short and curved tentacles on the antero-lateral corners. Posterior end of body bears two pedicles commonly seen in other species of the genus. The body has a dorsal covering of cuticular hooks arranged in 46-50 transverse rows. Each row consists of 8-10 hooks. The head and neck region supports tetrancres or 4-pronged hooks, while the rest of the posterior body has pentancres or 5-pronged hooks. All the hooks have prongs of equal size. There are 5 pairs of oval epidermal glands on the dorsal surface with refringent granular material. Short sensory cilia occur on cephalic tentacles and lateral margins of trunk. Ciliation on ventral surface is restricted to a median band extending from the anterior end to the posterior end.
Adhesive tubes occur in three groups. Anterior adhesive organ consists of two pairs of tubes on the ventral surface of head just behind the mouth. Eight pairs of evenly spaced ventrolateral tubes are present. The posterior adhesive pedicles are trifid with dorsal and two ventral tubes. Between the two pedicles on the inner side occurs a pair of posteriorly directed tubes.
The mouth is widely extensible and inclined to the ventral surface. Pharynx occupies nearly 1/3rd of the total gut length. Pharyngeal pores are distinct at the posterior end of pharynx. Anus subterminal.

Reproductive system follows the usual pattern typical of the genus with a single testis and ovary. The linear testis lies on the right side of the gut. Receptaculum seminis and bursa copulatrix are bladder-like and open on the ventral surface close to the male genital aperture and anus.


Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology
Habitat:  Demersal, Sandy, Coastal

Biogeography


• Andaman and Nicobar Islands, West Bay INDIA (Record: 28/03/1990) (Depth: 0.1 mts)

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • 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
  • Sealifebase Available at - http://www.sealifebase.org/

Page last updated on:2010-11-22

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