Nematopsis quadratum     (Protozoan)
Organism information awaits expert curation
Class: Conoidasida

Sporadins: Biassociative, association caudofrontal; color milky-white. Syzygy early, linear.
Primites: Always larger than satellites. Protomerite shape hemispherical with a plano-convex to biconvex lens-shaped structure at anterior part; epicyte uniformly thick, striated; endocyte granular. Septum circular, convex toward deutomerite. Deutomerite elongate ovoid, narrow behind septum gradually widens caudally, posterior end broadly rounded; maximum width in posterior half; epicyte hyaline; endocyte granular; a transparent lens-shaped structure at posterior part. Interlocking mechanism between primite and satellite well developed. Nucleus spherical to ovoid.
Satellites: Protomerite and septum similar to that of primite. Deutomerite widest behind septum, gradually tapers caudally, posterior end rounded. Nucleus spherical to ovoid, faintly visible in fresh sporadins, variable in position; endosome single, round to ovoid.

Gametocysts: Shape spherical; color milky white, opaque. Cyst wall double; epicyst thick, hyaline, width uneven, 20.4 - 40.
Gymnospores: Shape spherical; diameter 7.5; uninucleated bodies arranged radially in rosette pattern around central, hyaline cytoplasm.
Trophozoites: Development extracellular. Smallest observed trophozoite has a hemispherical, protomerite and cylindrical deutomerite. Largest observed trophozoite was elongate, almost cylindrical, with hemispherical protomerite and elongated deutomerite.

Type host: Sesarma quadratum (Fabricius)
Site of infection: Intestine

Synonym (s)

Common Name (s)
Economic Importance and Threats



• Kerala, Vallarpadam INDIA (Record: 2001)

Literature Source(s)
  • Prasadan, PK and Janardanan, KP (2001) Three new species of gregarines (Apicomplexa: Sporozoea: Porosporidae) in the estuarine crabs from Kerala, India Acta Protozoologica 40(4) 303-309 Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Integrated Taxonomic Information System (ITIS) Available at -

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