Acoelomates: Phylum Platyhelminthes and Nemertea - Biosciweb.net

Acoelomates: Phylum Platyhelminthes and Nemertea and
Pseudocoelomates: Phyla Nematoda and Rotifera & Parasitism 6.14
Lab #6 - Biological Sciences 102 – Animal Biology
‣ Observation of an Example of Trematode Copulation
‣ Draw the male and female Schistosoma mansoni in copulation from a prepared slide
indicating which sex is which.
‣ What aspect of their reproduction is unusual with respect to other trematode species?
Phylum Platyhelminthes
Class Cestoda = tapeworms
‣ Observe the specimens and/or diagrams of the
species listed below.
‣ Record the descriptive information requested at the
end of the lab for this species.
‣ one adult cestode tapeworm on display
‣ Observation of Cestode Body Structures
‣ Using a microscope and the preserved, prepared slides identify the following structures of
cestodes.
‣ Examine a prepared slide of a scolex (head) from a tapeworm such as Taenia sp. or
Diplidium sp. .
‣ Sketch and label the scolex. Label the four suckers, and the hooks.
‣ Examine a slide of a gravid proglottid of a cestode. Note the following structures:
(you do not need to draw this, but you should be able to identify these in a diagram)
‣ nerve cords (as visible)
male reproductive structures are not easily
‣ excretory canals
visible in a gravid proglottid
‣ vagina/genital pore
‣ Note how the ova are packed into the branched uterus
‣ Roughly, how many eggs are their per gravid proglottid?
(are there 10s, 100s, 1000s, millions of eggs per gravid proglottid?)