Egg-parasitoids wasps of Ischnura senegalensis

The final renewal day of this page is August 17, 2004.

Ischnura senegalensis inhabits to the pond and swamp of the beach nearby plain.  As for a female, there are 2 types.  One of type resembles in a male.  The other is the type that did orange for a while after emaergence.  A female lays eggs alone.  I confirmed 2 species of egg-parasitoids wasps (Trichogrammatidae and Mymaridae).

Figure 13-1   1: Ischnura senegalensis     The female in the figure is the type of the same color as a male.   2: The inhabitant environment of Ischnura senegalensis    Ischnura senegalensis is inhabiting in the wide area such as the river of a flow slowly, the pond, and lake that there are many aquatic plants.

Figure 13-2 1: The egg of Ischnura senegalensis   As for several eggs that showed it with a white arrow, an egg-parasitoid wasp (Mymaridae) is parasitic. It is seen the eggs of several aquatic insects other than Ischnura senegalensis.

Figure 13-3 Pupa of Mymaridae    1:Three days before it appears from an egg   2:The previous day when appears from an egg   The antenna of the male is long.  We can distinguish a male and female with the length of an antenna also in the time of a pupa.  (This figure has been made 2 times of Figure 13-4.)


Figure 13-4   Mymaridae   1:Male  Length of this male is 0.54 mm. A male has a considerably longer antenna than body length.  2:Female   The length of this female is 0.54 mm.  A female has a little shorter antenna than body length.


Figure 13-5 Egg-parasitoid wasp of Trichogrammatidae   1:Pupa  2:Adult  The size of this individual is 0.55 mm.  (This figure has been made 2 times of Figure 13-4.)