How does the body shape of Gasteracantha typically differ from many Micrathena species?

Answer

Gasteracantha has a wide, shield-like form, whereas Micrathena is often triangular or elongated.

Many other orb weavers are round, elongated, or hump-backed; some species of Micrathena also have spines, but their bodies are often more triangular or elongated than the wide, shield-like form typical of Gasteracantha.

How does the body shape of Gasteracantha typically differ from many Micrathena species?
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