MadSci Network: Zoology
Query:

Re: Can you help identify clear eggs (1/2 mm in size) found under a board?

Date: Thu Nov 23 11:24:06 2006
Posted By: Elsa Cade, Science Education Instructor/entomologist
Area of science: Zoology
ID: 1162856895.Zo
Message:

    Unfortunately, the description you have provided makes it very difficult to identify the eggs.  I 
am guessing it could be one of several types of creatures. I didn't get enough information on the 
way the eggs were under the board. It depends on how much contact the board had with the soil.  
My first guess would be ant eggs.  Ants move their eggs around to help keep them warm, so in 
on a cooler day the ants will move the eggs to a spot just under a stone or a piece of wood in the 
sun where the eggs will be warmer.  If it really gets cold they will move them back down deep 
and away from freezing weather.  On a really hot day they will move the eggs deeper too to keep 
them cool.  So, that is my first guess.  They also could be termite eggs????
     But the tiny twisted ends part does not make me think they are ant or termite eggs. Plus, you 
didn't say there were ants around so that also makes me think they are not ant eggs. I grew up in 
Texas, so I have turned over a lot of boards and usually they were ant eggs and the ants usually 
ran around carrying them to safety. 
Another guess is that they are snail eggs which are usually moist and hidden under boards.  But 
snail eggs are usually all stuck together. 
  Finally, another possibility is maybe some type of fly. Many fly eggs have "funny looking ends" 
that help in breathing.  After a bit more research, I found a Mango fly in Florida that has a 
"conspicuous structure at the anterior pole, which is called a respiratory horn". A similar 
structures is described in other fruit fly eggs.  Fruit flies lay their eggs in rotting vegetable 
material, so there may have been some rotten leaves under the board.  Texas has fruit flies, too. 
     My guess is that they are some type of insect but which one is hard to figure out. 
Unfortunately, the egg stages of many insects look very similar to one another.  The eggs look so 
much alike that forensic insect experts doing a criminal investigation collect eggs and have to 
rear them to the adult stage to see what kind of insect it is.  Once they identify the insect, they 
can then count days backwards to the "average number" days of development in order to 
determine the amount of time  a person has been dead.  So as you can see identifying eggs can 
difficult.  



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