In:
ZooKeys, Pensoft Publishers, Vol. 813 ( 2019-01-07), p. 89-110
Abstract:
Adult horned beetles (Coleoptera, Scarabaeidae, Dynastinae) such as Trypoxylusdichotomus (Linnaeus, 1771) exhibit bark-carving behaviors to feed on tree sap, in part by using small projections of the clypeus. However, in the present experiments, adult horned beetles ( T.dichotomus and Dynasteshercules (Linnaeus, 1758)) used their mandibles and not the projections of the clypeus to carve bark. Our findings show the presence of completely engaged mandibular interlocking, gear-like surface structures in molar areas that guide mandible opening and closure, and lead to completely synchronous movements of adult horned beetle mandibles. Three-dimensional shapes of these mandibular gear-like structures are complex and remained in contact after the death of a beetle. Moreover, adult horned beetles often performed bark-carving behaviors using only the mandible of one side, suggesting that the primary role of the mandibular gear-like structure is to prevent breakage of the mandible by transmitting load from one mandible to the other. Among the 22 Dynastinae and 16 other beetle species examined (not Dynastinae), the gear-like structure was found in all the Dynastinae species and in no other species.
Type of Medium:
Online Resource
ISSN:
1313-2970
,
1313-2989
DOI:
10.3897/zookeys.813.29236
DOI:
10.3897/zookeys.813.29236.figure1
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10.3897/zookeys.813.29236.figure8
DOI:
10.3897/zookeys.813.29236.suppl1
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10.3897/zookeys.813.29236.suppl10
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10.3897/zookeys.813.29236.suppl11
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10.3897/zookeys.813.29236.suppl12
DOI:
10.3897/zookeys.813.29236.suppl13
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10.3897/zookeys.813.29236.suppl2
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10.3897/zookeys.813.29236.suppl3
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10.3897/zookeys.813.29236.suppl4
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10.3897/zookeys.813.29236.suppl5
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10.3897/zookeys.813.29236.suppl6
DOI:
10.3897/zookeys.813.29236.suppl7
DOI:
10.3897/zookeys.813.29236.suppl8
DOI:
10.3897/zookeys.813.29236.suppl9
Language:
Unknown
Publisher:
Pensoft Publishers
Publication Date:
2019
detail.hit.zdb_id:
2445640-8
SSG:
12
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