The most consistent characteristic used to separate these two families are internal genitalia differences.
2.
The internal genitalia are all the accessory glands and ducts that connect the gonads to the outside environment.
3.
The internal genitalia comprise the accessory sex glands, which include the vesicular glands, the prostate gland and the bulbourethral glands.
4.
The other, hidden sex organs are referred to as the " secondary sex organs " or " internal genitalia ."
5.
During " the quick and violent mating, " the male literally explodes his internal genitalia into the genital chamber of the queen and quickly dies.
6.
Since internal genitalia require specific training and tools to identify, it is almost impossible to tell a member of the Gerridae apart from a member of the Veliidae by external visual cues.
7.
In a female fetus with a normal karyotype and cryptophthalmos, ambiguous external genitalia, syndactyly, bilobed lungs, bilateral renal agenesis, hypoplastic bladder, and agenesis of internal genitalia with streak ovaries, Shafeghati et al . ( 2008 ) identified homozygosity for a splice site mutation in the FREM2 gene ( 608945.0002 ).
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