Hemipera ovocaudata   Nicoll,  1913 (Marine Worm)
Organism information awaits expert curation
Class: Trematoda

Size: Length: 1.29-1.40 mm.
Width: 0.49-0.56 mm.

Body small, oval; ecsoma absent. Tegument smooth. Ventral sucker large, 0.33-0.41 mm in diameter, situated at 0.64-0.68 mm from anterior end of body. Oral sucker subterminal, 0.14-0.20 mm long, 0.16-0.23 mm wide, almost half as large as ventral sucker. Sucker ratio-1:2.

Prepharynx absent; pharynx, globular, 0.06-0.07 mm long, 0.06-0.09 mm wide; oesophagus very short; intestinal caeca reaching upto posterior end of body.
Testes two, symmetrical, irregular in shape, posterior to vitellaria, near posterior end of body, left testis 0.12-0.17 mm long, 0.10-0.12 mm wide, right testis 0.14-0.20 mm long, 0.13-0.14 mm wide. Seminal vesicle oval or pyriform; pars prostatica tubular, short, surrounded by prostate gland cells, enclosed in weak cirrus sac. Sinus organ formed, cone like. Genital opening near pharynx.
Ovary subglobular, 0.10-0.11 mm long, 0.08-0.10 mm wide, entire, median, pretesticular, postacetabular, disposed between two masses of vitellaria. Seminal receptacle weakly developed. Vitellaria compact, in two separate masses, unlobed, posterolateral to acetabulum, one on either side of ovary. Uterus entirely preovarian, largely preacetabular, intercaecal. Eggs filamented, 45-106 µm x 20-36 µm.
Excretory sac 'y' shaped, arms uniting dorsal to pharynx.

Synonym (s)

Common Name (s)
Economic Importance and Threats



• Orissa, Chilika Lagoon (Lat: 19.77) (Long: 85.33) INDIA
• 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 - http://www.marinespecies.org

Page last updated on:2010-10-07

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