IGM is the airport code for Kingman, Mojave county, right here in Arizona. Geez! I thought that everyone knew that!Mind if I ask what the IGM list stands for?
here:Mind if I ask what the IGM list stands for?
There are several species in stock which consist of a hopeless mixture of several strains. That's why we use the IGM numbers seen in my signature. They differentiate between strains, not just between species. Size is a complicated feature. It depends on environmental conditions as well as on genetics. In widely distributed species, it is desireable to know the origin and, more important, not to mix up stocks. B. mendica is such a species, ranging from the Canaries to India. Now, it seems logical that stocks of different origin require different conditions. You cannot trace any pecularities of a certain stock if the strains are mixed up all the way.
Despite of this, when comparing sizes one has to take into account that people often measure the sizes of an insect wrongly - if they measure it at all and not just approximate and thus, overestimate. The size of an mantid is measured from the vertex to the tip of the abdomen. Wings are not included, but people usually consider them as the animal seems larger then.
After all, without any origin, noone can say why your specimens are smaller than others. It would be variability if you had smaller and larger ones, but as you seem to have just smaller ones, it is hard to say what the reasons are. Sometimes powerbreeding results in smaller animals with shorter generations, but it is not clear that this was the case with your specimens.
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