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Issue: Vol. 6 No. 4: August 2023
Type: Article
Published: 2023-08-28
DOI: 10.11646/palaeoentomology.6.4.9
Page range: 372–384
Abstract views: 287
PDF downloaded: 198

The strange holometabolan beak larva from about 100 million years old Kachin amber was physogastric and possibly wood-associated

Ludwig-Maximilians-Universität München, Biocenter, Großhaderner Str. 2, 82152 Planegg-Martinsried, Germany; GeoBio-Center at LMU, Richard-Wagner-Str. 10, 80333 München, Germany
University of Yangon, Department of Zoology, University Avenue Road, Kamayut Township 11041, Yangon, Myanmar
University of Yangon, Department of Zoology, University Avenue Road, Kamayut Township 11041, Yangon, Myanmar
University of Yangon, Department of Zoology, University Avenue Road, Kamayut Township 11041, Yangon, Myanmar
Ludwig-Maximilians-Universität München, Biocenter, Großhaderner Str. 2, 82152 Planegg-Martinsried, Germany; GeoBio-Center at LMU, Richard-Wagner-Str. 10, 80333 München, Germany
Neuropteriformia Partisaniferus Myanmar amber Burmese amber convergent evolution

Abstract

The group Neuropteriformia (beetles, lacewings, etc.) is today very species-rich, but also has a good fossil record in the Mesozoic. Amber provides not only adults, but also fossil larvae; some of these fossil neuropteriformian larvae have very unusual morphologies not seen in the modern fauna. We here report an unusual new fossil neuropteriformian larva. The mouthparts form a beak. Fossil larvae with similar mouthparts are known, and it seems that this new larva is a representative of the species ?Partisaniferus edjarzembowskii. The new larva, unlike the already known ones, has a large and inflated trunk. Based on comparison with extant larvae, such an inflated trunk should be considered physogastric. The new larva is only the second case of physogastry in fossil holometabolan larvae. Also early larvae of this species are known. The strong difference between the different larval stages give reason to interpret the ontogeny hypermetamorphic. Also this phenomenon is in fact very rare in the fossil record; most earlier candidates remain assumptions without further substantiation. Physogastry in larvae is often coupled to a mode of live in confined spaces, for a fossil preserved in amber this may mean living inside wood. Feeding mode might have been predatory, but could also have been feeding on fungi.

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