About Our Planarians

  • D. dorotocephala is found in running and standing waters across North America.
  • The full grown animals are on average are 30mm long and 3.5mm wide.
  • The head is triangular with a rather pointed anterior tip.
  • The auricles are elongated and sharply pointed. They extend laterally, but they are usually held elevated while the worm is moving.
  • The coloration on the dorsal side is composed of spots of various shades of brown, white, and black.
  • The ventral side is less pigmented than the dorsal side.
  • Their reproduction is asexual by fission.
  • ... [more]
  • Girardia sp. is a common species, found in warm ponds, lakes, and rivers across North America.
  • The full grown animals are on average 6-18mm long and 1-3mm wide.
  • The head is triangular with a rounded anterior tip.
  • The auricles are short and broad.
  • The coloration on the dorsal side can vary and often times is almost uniformly brown with irregularly dispersed white splotches.
  • The ventral side is less pigmented than the dorsal side.
  • Their reproduction is asexual by fission.

Reference: R Kenk, Oceanograph... [more]

  • P. gracilis is distributed in the eastern United States, south of the Delaware River and east of the Missouri River.
  • The animal are 8-30mm long and 1.5-6mm wide.
  • The head is truncated at the anterior end with a slightly bulging frontal margin.
  • The auricles are rounded and protruding laterally at the anterior end of the head.
  • The coloration on the dorsal side is dark brown to almost black.
  • The ventral side is somewhat lighter than the dorsal side.
  • There are multiple pharynges that are extruded outside the worm body through only one mo... [more]
  • P. morgani is an inhabitant of springs and cold creeks of eastern North America from New Brunswick to North Carolina and as far west as Kentucky. They have also been found in El Dorado County, California.
  • The animals are approximately 14mm long and 2mm wide.
  • The head is rectangular with a truncated anterior end and rounded lateral edges.
  • The auricles are flattened along the head.
  • The coloration on both the dorsal and ventral sides is white.
  • Their reproduction is asexual by fission.

 

... [more]

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