EmilyCoyte's picture

Winged and wingless crickets to ID

Observed: 22nd July 2011 By: EmilyCoyteEmilyCoyte’s reputation in InvertebratesEmilyCoyte’s reputation in Invertebrates
Garden walk July 2011 021
Garden walk July 2011 021 1
Description:

2 different crickets - very similar in appearance but one has wings. Both have ovipositors. What are they and what is the difference between them?

Identifications
Species interactions

No interactions present.

Comments

Michael Skelton's picture

Roesel's Bush-cricket

I agree the identification above, but both are adult; that on the left is a normal short winged individual, while the other is an example of the macropterous (long winged) form, which can fly , and by means of which the species has been extending its range. There would not have been any Roesel's Bush-crickets in your area until recently.

EmilyCoyte's picture

Thanks

oooh, that's interesting, thanks! Do you know if the macropterous breed freely with the "normal" form, and are the offspring all macropterous, normal or a mix according to Mendelian genetics, or are there other forces at work to product the macropterous form?

Come forth into the light of things, let nature be your teacher.

William Wordsworth

Matt Smith's picture

Winged or wingless?

"Other forces" is probably the best explanation. Roesels is normally wingless as an adult, but if environmental conditions are good during the nymphal stage (eg warm / sunny / condusive to dispersal) then a proportion of the adults develop into fully winged forms. Both forms can interbreed sucessfully. I have seen a few myself this year, some years I don't see any winged adults.

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Masked Marvel's picture

Thanks for clarifying that, I

Thanks for clarifying that, I did think it looked big...

Michael Skelton's picture

Roesel's Bush-cricket

I would add to the above that high population density in the nymphal stage is a known trigger for the production of macropters.