CLASSIFICATION OF PROTODRILUS

PHYLUM :- ANNELIDA (Metamerically segmented, coelomate and laterally symmetrical. )

CLASS :- ARCHIANNELIDA (Primitive annelids.)

ORDER :- HAPLODRILI (Primitive polychaete worms)

FAMILY :- POLYGORDIIDAE (Short tentacles.)

GENUS :- Polygordius

SPECIES :- lacteus

GEOGRAPHICAL DISTRIBUTION

  • It is found living in tht, sand of the European seas

HABIT AND HABITAT

  • Polygordius is a small, simple, aberrant, marine scavenger worm

POLYGORDIUS

GENERAL CHARACTERSTICS OF POLYGORDIUS​

  • Body is narrow, elongated, cylindrical and resembles larval polychaetes.
  • Divisible into head and body segments, measuring 30 to 100 mm. 
  • Head comprises of small prostomium and large peristomium.
  • Head bears a pair of small prostomial tentacles, ventral mouth and ciliated pits.
  • External segmentation of the body is faintly marked by grooves in anterior region and clearly marked in posterior region. 
  • Coelom is divided by septa, last segment contains anus. 
  • Setae, parapodia, cirri and gills are absent. 
  • Sexes are separate. Gonads develop in posterior segments. There are no reproductive ducts.
POLYGORDIUS

IDENTIFICATION

  • The animal contains small prostomium and large peristomium and all above features, hence it is Polygordius.

POLYGORDIUS
POLYGORDIUS
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