It is formed by secretion of collateral glands,over 16 fertilised eggs are arranged in 2 rows of 8 each.They are found in genital pouch of female cockroach or mantis.
Female cockroach (Periplaneta fuliginosa) with ootheca
Praying mantis (Mantis religiosa) Ootheca in Guelph, Ontario, Canada.
Damaged praying mantis (Mantis religiosa) ootheca in Guelph, Ontario, Canada.
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