CLASSIFICATION OF PLANARIA​ : DUGESIA

PHYLUM :- PLATYHELMINTHES (Organ grade, acoelomate flatworms. )

CLASS :- TURBELLARIA  (Epidermis is partly ciliated containing rhabdites.)

ORDER :- TRICLADIDA (Intestine (clad) has three branches. )

FAMILY :- PLANARIIDAE (Adhesive organs absent. Head triangular and truncated.)

GENUS :- Dugesia

GEOGRAPHICAL DISTRIBUTION

  • Cosmopolitan, commonly found in temperate zones, U.S.A., India and U.K.

HABIT AND HABITAT

  • Dugesia is a fresh water, triclad found in streams, springs, ponds, lakes and caves, gliding over stones and debris by the side of the pond or on the bottom
PLANARIA​ : DUGESIA

GENERAL CHARACTERSTICS OF PLANARIA​ : DUGESIA

  • Commonly known as Planaria.
  • Dark brown elongated cylindrical animal measuring approximately 15 mm in length.
  • Body differentiated into dorsal and ventral surfaces. Ventral surface contains adhesive and ciliated zones.
  • Anterior region is called as head. 
  • Head is triangular containing 2 ear like auricles on side and 2 semicircular ocelli. 
  • Body tapers posteriorly as a pointed end. 
  • Digestive system, consists of mouth, proboscis, oesophagus and intestine. 
  • Intestine is peculiar having three branches, one extending upwards and two backwards and hence the name Tricladida
  • Mouth encircled by proboscis pore. Proboscis is highly muscular and lies in a proboscis sheath and is everted through the proboscis pore.
  • Gonopore lies behind proboscis pore. It reproduces sexually and asexually.
PLANARIA​ : DUGESIA

IDENTIFICATION

  • The specimen contains auricles, eyes and all above characters and hence it is Dugesia.
PLANARIA​ : DUGESIA
PLANARIA​ : DUGESIA
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