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Instar and Sex Determination of Blaptica dubiaUsing Morphological Characters

Hao Wu

Department of Entomology and Plant Pathology

April 27, 2012

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Figure: The abdomen(ventral side) of first Instar

Only one pattern was found, although there are some varieties.

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(a) Type I (b) Type II

Figure: The abdomen(ventral side) of second Instar

Two types were found. Type I has valved S9.

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(a) Type I (b) Type II

Figure: The abdomen(ventral side) third Instar

Two types were found. Type I has valved S9.

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(a) Type I (b) Type II

Figure: The abdomen(ventral side) of 4th Instar

Two types were found. Type I has valved S9.

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(a) Type I (b) Type II

Figure: The abdomen(ventral side) of 5th Instar

Two types were found. Type I have valved S9, partially covered byS7. S8 disappered.

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(a) Type I (b) Type II

Figure: The abdomen(ventral side) of 6th Instar

Two types were found. Type I have valved S9, almost covered byS7.

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(a) Type I (b) Type II

Figure: The Mesonotum and the Metanotum of 6th Instar

The Mesonotum and the Metanotum in Type I and Type II dubiacockroaches

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Figure: Type I(6th instar),S7 moved

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(a) Type I (b) Type II

Figure: The abdomen(ventral side) of 7th Instar

Two types were found. In type I, S9 disappe

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(a) Type I (b) Type II

Figure: The Mesonotum and the Metanotum of 7th Instar

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(a) Type I (b) Type II

Figure: The abdomen(ventral) of Adults

Based on the adults characters, It is reasonable to conclude thatType I is Female and Type II is Male.

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Conclusion

I Sex determinationI Except for the first instar, S9 can be used as a character to

determine sex.I In the 6th and 7th instar, Mesonotum and Metanotum can

also be used to determine sex.

I Instar determinationI S9 can be used to determinate 5th,6th,7th instar of female.I S8 can be used to determinate 7th instar of male.