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Hi, this nice one was found under decaying wood. About 16 mm long.

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2

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Hi, is this a Keroplatid?

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It may be Leptomorphus sp. from Sciophilidae. I'll ask one more specialist and write you again a little later about his opinion.

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Final decision - LEPTOMORPHUS sp.

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Please, enlighten us on how that final decision was made.

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I have consulted first the work by Madwar, 1937, then Dr. A.I.Zaitzev and then summarized our opinions.

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And what are the characteristics that would allow us to correctly recognise one if we came across it? Or is that too complicated to explain here?

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Keroplatidae larvae has 4 anterior body segments differentiated well and the rest like in a earthworm, besides the shape of head is square. Larva apneustic.
Sciophilidae larvae are peripneustic (1 thoracal + 7 abdominal spiracles), body segments differentiated well and head oval. Head of Leptomorphus ventrally with labrum having 7 large papillae like dents.
Pigmented Ceroteleon larvae with transverse coloured picture, and Leptomorphus with longitudinal stripes and spots. I have checked some descriptions - Leptomorphus seems to be the ?only? coloured larva among Sciophilidae, the others are whitish, yellowish etc.
I'll try to attach Keroplatus larva in the nearest time, it is in the other computer now.

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This is typical Keroplatus larva

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Thanks. Sciophilidae should be Sciophilinae?

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Many thanks for the determination! According to FE, Sciophilinae of the Mycetophilidae.

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Yes, Mycetophilidae.