A new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (Coleoptera: Scarabaeoidea)

Although best known for the capacity to fully conglobate their bodies into a "perfect" spheroid, a few Ceratocanthinae (=pill scarabs; Coleoptera: Hybosoridae) have drastically different body architecture. Six South American species, or 1.5% of species diversity, have straight bodies inc...

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Autores principales: Vasily V. Grebennikov, Andrew B.T. Smith
Formato: article
Lenguaje:EN
IT
Publicado: PAGEPress Publications 2021
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DNA
Acceso en línea:https://doaj.org/article/ab7b1078b7d040c3a5494b150bcb2ad0
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spelling oai:doaj.org-article:ab7b1078b7d040c3a5494b150bcb2ad02021-12-05T12:54:20ZA new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (Coleoptera: Scarabaeoidea)10.13133/2284-4880/5700429-288X2284-4880https://doaj.org/article/ab7b1078b7d040c3a5494b150bcb2ad02021-11-01T00:00:00Zhttps://rosa.uniroma1.it/rosa02/fragmenta_entomologica/article/view/570https://doaj.org/toc/0429-288Xhttps://doaj.org/toc/2284-4880 Although best known for the capacity to fully conglobate their bodies into a "perfect" spheroid, a few Ceratocanthinae (=pill scarabs; Coleoptera: Hybosoridae) have drastically different body architecture. Six South American species, or 1.5% of species diversity, have straight bodies incapable of any conglobation, while some 20% of species can achieve only incomplete body conglobation with legs and abdomen partly exposed. Historically, both latter character states were considered as ancestral and transitional, respectively, in the irreversible evolutionary "progression" towards full-body conglobation. Here we use molecular sequence data to hypothesize a new clade uniting all bodily straight and incompletely conglobate pill scarabs. Significantly, this clade is nested within a clade otherwise consisting of species capable of full-body conglobation. This topology implies that the most recent common ancestor of all pill scarabs had a capacity of full-body conglobation. Consequently, we re-interpret the pill scarab straight and partly conglobate body architectures as secondary reversals to the ancestral condition from the fully conglobate state. If so, the tribe Ceratocanthini uniting 98% of pill scarab species is rendered paraphyletic by two remaining and much smaller South American tribes, Ivieolini and Scarabatermitini. The latter contains three and five rare species, respectively, all of them supposedly termitophilous and all herein illustrated. Vasily V. GrebennikovAndrew B.T. SmithPAGEPress PublicationsarticleDNAphylogenyScarabaeoideaIvieolustermitophilybody architectureZoologyQL1-991ENITFragmenta entomologica, Vol 53, Iss 2 (2021)
institution DOAJ
collection DOAJ
language EN
IT
topic DNA
phylogeny
Scarabaeoidea
Ivieolus
termitophily
body architecture
Zoology
QL1-991
spellingShingle DNA
phylogeny
Scarabaeoidea
Ivieolus
termitophily
body architecture
Zoology
QL1-991
Vasily V. Grebennikov
Andrew B.T. Smith
A new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (Coleoptera: Scarabaeoidea)
description Although best known for the capacity to fully conglobate their bodies into a "perfect" spheroid, a few Ceratocanthinae (=pill scarabs; Coleoptera: Hybosoridae) have drastically different body architecture. Six South American species, or 1.5% of species diversity, have straight bodies incapable of any conglobation, while some 20% of species can achieve only incomplete body conglobation with legs and abdomen partly exposed. Historically, both latter character states were considered as ancestral and transitional, respectively, in the irreversible evolutionary "progression" towards full-body conglobation. Here we use molecular sequence data to hypothesize a new clade uniting all bodily straight and incompletely conglobate pill scarabs. Significantly, this clade is nested within a clade otherwise consisting of species capable of full-body conglobation. This topology implies that the most recent common ancestor of all pill scarabs had a capacity of full-body conglobation. Consequently, we re-interpret the pill scarab straight and partly conglobate body architectures as secondary reversals to the ancestral condition from the fully conglobate state. If so, the tribe Ceratocanthini uniting 98% of pill scarab species is rendered paraphyletic by two remaining and much smaller South American tribes, Ivieolini and Scarabatermitini. The latter contains three and five rare species, respectively, all of them supposedly termitophilous and all herein illustrated.
format article
author Vasily V. Grebennikov
Andrew B.T. Smith
author_facet Vasily V. Grebennikov
Andrew B.T. Smith
author_sort Vasily V. Grebennikov
title A new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (Coleoptera: Scarabaeoidea)
title_short A new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (Coleoptera: Scarabaeoidea)
title_full A new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (Coleoptera: Scarabaeoidea)
title_fullStr A new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (Coleoptera: Scarabaeoidea)
title_full_unstemmed A new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (Coleoptera: Scarabaeoidea)
title_sort new hypothesis on the evolution of the hybosorid beetle capacity to conglobate their bodies into a tight ball (coleoptera: scarabaeoidea)
publisher PAGEPress Publications
publishDate 2021
url https://doaj.org/article/ab7b1078b7d040c3a5494b150bcb2ad0
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