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abortion of ootheca (Madagascar giant hissing cockroach, adult femaile)

Description: abortion of ootheca by the adult femaile of Madagascar giant hissing cockroach. ---------- {{{ About An Aborted Ootheca }}}

Females of Madagascar giant hissing cockroach (Gromphadorhina portentosa) lay their eggs in a purse-like capsule known as an ootheca. This ootheca (egg case) is retained within her body (brood pouch) until the eggs hatch, and the young roaches first see the world as tiny nymphs. Technically speaking, these newly born babies are called “Neonates”. You may occasionally see a female with the egg-case extruded in your colony. This can be seen all year long in controlled environment. (The same can be said to their mating.) Such a female is in the process of forming the case as if she is "air drying" it. Healthy extruded egg-case is solid, two-lines and straight. This behavior is believed by entomologists to be obtained by the Madagascar hissers recently in their evolutional process.

Once the extruded egg-case is completely formed and "ready", she will retract it into a special cavity in the tip of her abdomen. Nevertheless, when the female is not well fed or under consistent stresses such as undesirable environmental changes (i.e., just shipped from a dealer in other states to your apartment, loud noises, improper temperature and humidity, or even improper foods given), she can not produce healthy ootheca. Eggs might be extruded individually or loosely hanging outside of her body like a skinny arch. In such incidences, unfortunately they are to be left alone on the ground. They are sooner or later eaten by cagemates as nutritious good food - they do not waist perfectly good protein-rich good foods.

A female that has been successfully fertilized will retain the eggs within this cavity in her abdomen for at least 60 days. The aborted Hisser eggs left alone on the ground, usually can not grow into babies (unless they are truly the last stage of maturity). Incubation of abandoned eggs in a test tubes or glass container with proper gel nutrient and consistent oxygen circulation is rather difficult, costly and inefficient way to save the eggs or solve the source of problem.

During this period, baby Madagascar hissers grows inside of the egg-cases inside of their mother's abdomen, safely protected from outsiders. Be very gentle and nice to pregnant ladies! They are doing the truly miraculous works within their body.

As long as you feed the colony mainly with dry dog food or dry cat food that are rich in protein, you do not need to separate the pregnant mother from her cagemates --- In another words, if you do not feed them good foods, her cagemates (male and females) will eat the newly born babies (soft, tiny, ivory white with black cute eyes) to get much needed protein. So, do not just feed Madagascar Hissers vegetables and fruites. This is extremely important! Hissers like cooked juicy drumsticks of turkey (after thanksgiving day) and chicken. It is amazing to see how quickly and neatly they clean it to the bare bone!


There is a remarkable experiment regarding “saving” this “abandoned ootheca” in one of the Japanese Internet roach websites (written in Japanese) by a pet roach enthusiast. He picked up the “abandoned ootheca” (solid form) of another giant tropical roach carefully and placed it on sphagnum moss in a small closed container and keeps it with high humid and high temperature. In this way, in a week, he succeeded hatching 10 babies from the “abandoned ootheca”. He also featured many photographic records of this experiment in his website. Personally speaking, I tried his methods several times for “abandoned oothecas” (both solid forms and separated forms) of Hisses and Giganteus in the past. Nevertheless, I was not successful.

Good luck to you and your pet insects!


All the rights reserved by Takeshi Yamada 2006

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abortion of ootheca (Madagascar giant hissing cockroach, adult femaile) Post a Comment | Report Photo   
User: Takeshi (see all of Takeshi's photos)
Views: 3277
Date: 03/10/06
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