Hemimetabolous Insects

1.  The life stages of a hemimetabolous insect are:    egg => nymph => adult
      What physical characteristics could you use to distinguish a 
      hemimetabolous nymph from an ametabolus young?




       


2.  Very primitive hemimetabolous insects cannot fold their wings over the back.  
      This is known as the paleopterous condition (meaning primitive wing).  
      Most paleopterous orders are extinct.  List common names for the two 
      orders that are still living:

                       Ephemeroptera ____________________________________


                       Odonata  _________________________________________


3.  Both paleopterous orders have aquatic immatures.  An aquatic nymph is often 
      called a naiad.  Ephemeroptera naiads are herbivores;  Odonata  
      naiads are predators.  What special adaptation do Odonata naiads 
      have for catching prey?








4.  All other winged insects are said to be neopterous (new wing).  They can 
      fold the wings down flat (unless they are secondarily wingless).  List all 
      of the hemimetabolous orders.  Which ones are Orthopteroids?  Which ones
      are Hemipteroids?  What is the main distinction between these two groups?














5.  Most hemimetabolous insects are scavengers or herbivores.  List all orders that 
      contain exceptions to this rule.  What special adaptations do these insects 
      have for a predatory or parasitic lifestyle?