Steringotrema chauhani     (Marine Worm)
Organism information awaits expert curation
Class: Trematoda

Image copyrights: Government of India

Size: Length: 1.60-1.72 mm.
Width: 0.52-0.62 mm.

Body oval, tegument spinose, Ventral sucker 0.26-0.35 mm in diameter, situated at o.43-0.59 mm from the anterior end of body. Oral sucker terminal, 0.11-0.13 mm long, 0.14-0.16 mm wide, smaller than ventral sucker. Sucker ratio 1: 2.14.

Peripharynx absent; pharynx muscular, 0.11-0.12 mm long, 0.12-0.15 mm wide. Oesophagus short, followed by bifurcated intestine. Intestinal caeca extending upto the level of testes.
Testes two, symmetrical, left testis 0.18-0.19 mm long, 0.14-0.15 mm wide, right testis 0.19-0.21 mm long, 0.14-0.17 mm wide, post-acetabular. Cirrus pouch preacetabular; internal seminal vesicle bipartite; pars prostatica surrounded by prostate gland cells. Genital pore near pharynx, submedian left side of the body.
Ovary bilobed, pretesticular, 0.13-0.15 mm long, 0.10-0.11 mm wide. Seminal receptacle present, anterodorsal to ovary. Vitellaria follicular, symmetrically arranged on both sides of the body in two separate groups, anteriorly extending to level of pharynx, posterior group extending to level of testes. Coils of uterus mostly filling hind body. Eggs 36-49 µm x 28-41 µm.
Excretory vesicle 'V' shaped; arms extending upto pharynx; pore terminal.

Similar species: This form comes close to Steringotrema divergens but differs from it in the extent if intestinal caeca, sucker ratio, lobed ovary and egg size.

Synonym (s)

Common Name (s)
Economic Importance and Threats



• Orissa, Chilika Lake INDIA

Literature Source(s)
  • Dutta, IB (1995) Platyhelminthes: Trematoda: Digenea Wetland ecosystem series 1: Fauna of Chilka lake ZSI, Calcutta 235-277 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -

Page last updated on:2010-10-08

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