Which pattern of insect succession is typically observed on outdoor decomposing remains?

• A. Mosquito larvae, then dragonflies, then arachnids
• B. Beetle larvae only, no flies
• C. Early colonization by Calliphoridae larvae, followed by flesh flies, then dermestid beetles as the remains dry and environmental conditions change
• D. Dermestid beetles, then flesh flies, then Calliphoridae

Answer: (C)

Insect succession on outdoor decomposing remains follows a predictable ecological progression driven by the changing resources and conditions as decay proceeds. The earliest wave is dominated by blowflies (Calliphoridae), which are drawn to fresh tissue by the strong odors and lay eggs that hatch into maggots that rapidly consume soft tissue. As decay advances and the tissue mass decreases or dries, flesh flies (Sarcophagidae) become more prominent, feeding on the remains and often arriving after the initial blowfly wave. Later still, once the remains are drier and the accessible resources shift to keratinized and desiccated tissue, dermestid beetles (Dermestidae) arrive to exploit these dry materials. This sequence—Calliphoridae first, followed by flesh flies, then dermestids as remains dry—fits the typical outdoor decomposition pattern.

Other options don’t align with this progression because they either omit the initial fly colonization, propose a different early group, or place dermestids before the fleshy feeders, which doesn’t reflect how changing moisture and tissue availability steer the succession.