planaria (a flatworm)
DESCRIPTION
Planaria (a flatworm). Polycelis felina. Description. P. felina are nonparasitic. They do not suck blood like leeches. are about 1 centimeter long. avoid light. Description. P. felina are flat with heads shaped like an arrow point. - PowerPoint PPT PresentationTRANSCRIPT
Planaria (a flatworm)
Polycelis felina
DescriptionP. felina• are nonparasitic. They do
not suck blood like leeches.
• are about 1 centimeter long.
• avoid light
DescriptionP. felina• are flat with heads shaped
like an arrow point.
• move by twisting, turning, stretching, and contracting its body.
FoodP. falina are carnivores.
• They eat decaying meat,
• insects,
• and larvae.
Method of FeedingP. falina• have a feeding tube in the
middle of its ventral side.• secrete digestive enzymes
from a single feeding tube to begin external digestion.
• suck up food through its feeding tube.
• eliminate waste through the same tube it eats with.
DigestionP. falina• have three germ
layers and a single digestive cavity.
• have branched intestines throughout the body
Planarian Traps
Habitat• Some planarians live in
saltwater.
• Some live in fresh water.
• Some live under logs and in the soil.
AdaptationsP. felina • secretes a slimy mucus.
• has cilia on its belly that help it glide on a film of mucus.
AdaptationsP. falina • have two eye spots that cannot see objects, but
only detect the brightness of light.
AdaptationsP. falina • Take in oxygen and release carbon dioxide by
diffusion through its skin.
O2 CO2
AdaptationsP. felina • can regrow lost body
parts.
• if cut in half, can regrow each half into two separate individuals.
Video(Planarian Regeneration and stem cells)
BibliographySlide 1: http://www.uniprot.org/taxonomy/6162
Slides 2-4: https://www.ebiomedia.com/the-biology-classics-planaria-feeding.html
Slides 3-7: http://en.wikipedia.org/wiki/Planarian
Slides 8-9: http://raven.islandwood.org/kids/stream_health/macros/Planaria.html
Slide 10-12: http://gardener.wikia.com/wiki/Planaria
Slide 13: http://mcb.illinois.edu/news/feature/270/ Video: http://www.hhmi.org/biointeractive/planarian-
regeneration-and-stem-cells