What is this vicious looking swimming thing? Larvae I assume but

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What is this vicious looking swimming thing? Larvae I assume but of what? About 4 long, Angeles National Forest in California. : r/whatsthisbug

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whats this fly. israel. about a normal fly size but with big tail. : r/whatsthisbug

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a small centipede looking bug on my carpet : r/whatsthisbug

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