Madygella Humioi sp. nov. from the Upper Triassic Mine Group, Southwest Japan: The Oldest Record of a Sawfly (Hymenoptera: Symphyta) in East Asia

Oyama, Nozomu; Maeda, Haruyoshi

doi:10.2517/2019pr005

Cited by 16 publications

(19 citation statements)

References 11 publications

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“…220 Ma) based on U-Pb age data of detrital zircon 32 , which is consistent with the biostratigraphy of marine and terrestrial invertebrates 28,33 . The Momonoki Formation exceeds 1000 m in thickness and is conformable with the subjacent Hirabara Formation 31,32 . The sandstones and muddy sandstones of the Momonoki Formation host impressions of plant and insect macrofossils.…”

Section: Geological Settingmentioning

confidence: 86%

“…The stratigraphic setting is subdivided into three strata: the Hirabara, Momonoki, and Aso Formations, in ascending order 28,29 . Study material was obtained from the Momonoki Formation, which yields the most abundant fossil plants and insects 30,31 . The Momonoki Formation is dated to the Middle Carnian (ca.…”

Section: Geological Settingmentioning

confidence: 99%

“…The sandstones and muddy sandstones of the Momonoki Formation host impressions of plant and insect macrofossils. The holotype specimen was collected by Fumio Takahashi at a road cutting on National Route 435 while the road was under construction; the locality also bore many insect fossils 31,[34][35][36] . The Momonoki Formation is overlain by lacustrine, deltaic, and lagoonal depositional environments 37 , and therefore lacks marine invertebrate fossils, unlike in the Hirabara and Aso Formations 30 .…”

Section: Geological Settingmentioning

confidence: 99%

“…Most of the insect fossils are isolated wings, but nearly complete bodies are also found 36 . The recorded insects encompass at least 12 orders: Odonata, Ephemeroptera, Blattodea, Plecoptera, Paraplecoptera, Reculida, Neuroptera, Hymenoptera, Coleoptera, Hemiptera, Mecoptera, Diptera 31 . In particular, there are rich yields of wings of Coleoptera (Taldycupedidae) and Blattodea (Mancusoblattidae, Mesoblattinidae) amongst the insect fauna of this deposit 31,34 .…”

Section: Palaeobiological Settingmentioning

confidence: 99%

“…The recorded insects encompass at least 12 orders: Odonata, Ephemeroptera, Blattodea, Plecoptera, Paraplecoptera, Reculida, Neuroptera, Hymenoptera, Coleoptera, Hemiptera, Mecoptera, Diptera 31 . In particular, there are rich yields of wings of Coleoptera (Taldycupedidae) and Blattodea (Mancusoblattidae, Mesoblattinidae) amongst the insect fauna of this deposit 31,34 . Notably, the Momonoki Formation yields true ies 36 , albeit undescribed, which have only been recorded from a few deposits from the Middle-Late Triassic [44][45][46][47][48][49] .…”

Section: Palaeobiological Settingmentioning

confidence: 99%

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Oldest Leaf-Mine Trace Fossil from East Asia and Stoichiometric Footprint: Insight Into Ancient Nutritional Flow in a Plant–Herbivore Interaction

Imada

Oyama

Shinoda³

et al. 2021

Preprint

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The Late Triassic saw a flourish of plant–arthropod interactions. By the Late Triassic, insects had developed all distinct strategies of herbivory, notably including some of the earliest occurrences of leaf-mining. Herein we describe exceptionally well-preserved leaf-mine trace fossils on a Cladophlebis fern pinnule from the Momonoki Formation, Mine Group, Japan (Middle Carnian), representing the oldest unequivocal leaf-mines from East Asia. The mines all display a distinctive frass trail – a continuous meandering line, which later becomes a broad blotch containing spheroidal particles – demonstrating larval development. The shapes of these mines generally resemble those of nepticuloid moths, although they are absent from extant fern-mining assemblages. Furthermore, elemental analyses by X-ray fluorescence (XRF) reveals that the frass trail comprises phosphate coprolites. The quantitative variations in P, S, and Si between coprolites and leaf veins may reflect physiological processes (consumption, absorption, and excretion) mediated by plant chemicals. Our findings reinforce the idea that leaf-mining had become a pervasive feeding strategy of herbivorous insects by the Late Triassic.

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Section: Geological Settingmentioning

confidence: 86%

Section: Geological Settingmentioning

confidence: 99%