Evidence for Early Mesozoic diversification of Hypsimetopidae Nicholls, 1943 (Isopoda), with the description of a new genus from Andhra Pradesh and notes on threats to Indian cave environments
Abstract A new phreatoicidean isopod, Speonastes venkataramanigen., sp. nov. is described from Borra Cave in northeastern Andhra Pradesh, India. This new taxon has features seen in most phreatoicideans such as ventrally projecting pleonal pleurae, but also has features characteristic of the hypogean...
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Online Access: | http://dx.doi.org/10.1093/jcbiol/ruac052 https://academic.oup.com/jcb/article-pdf/42/4/ruac052/47589299/ruac052.pdf |
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croxfordunivpr:10.1093/jcbiol/ruac052 2023-12-31T09:59:58+01:00 Evidence for Early Mesozoic diversification of Hypsimetopidae Nicholls, 1943 (Isopoda), with the description of a new genus from Andhra Pradesh and notes on threats to Indian cave environments Wilson, George D Shaik, Shabuddin Department of Science and Technology, Ministry of Science and Technology, India Indian Ministry of Environment, Forests and Climate Change Australian Biological Resources Study 2022 http://dx.doi.org/10.1093/jcbiol/ruac052 https://academic.oup.com/jcb/article-pdf/42/4/ruac052/47589299/ruac052.pdf en eng Oxford University Press (OUP) https://academic.oup.com/pages/standard-publication-reuse-rights Journal of Crustacean Biology volume 42, issue 4 ISSN 0278-0372 1937-240X Aquatic Science journal-article 2022 croxfordunivpr https://doi.org/10.1093/jcbiol/ruac052 2023-12-06T08:37:55Z Abstract A new phreatoicidean isopod, Speonastes venkataramanigen., sp. nov. is described from Borra Cave in northeastern Andhra Pradesh, India. This new taxon has features seen in most phreatoicideans such as ventrally projecting pleonal pleurae, but also has features characteristic of the hypogean family Hypsimetopidae, such as an elongated pleotelson with a medially rotating uropod that has protopodal denticles or denticulate setae opposing the denticulate margin of the pleotelson, as well as the distal article of the antennula being minute and the penultimate article elongated and somewhat inflated. Robustness-tested phylogenetic analyses of character data from exemplars from nearly all phreatoicidean genera and four non-phreatoicidean outgroups finds that this species is the earliest derived member of Hypsimetopidae. These analyses have substantial implications for both relationships among Phreatoicidea, but within the family as well. The body form of the Phreatoicidea basal to the hypsimetopid clade resembles the form seen in fossils or by recent taxa such as CrenisopusWilson & Keable, 1999. Ancestors of Speonastesgen. nov. may have independently colonized India from those of the Nichollsia-Andhracoides clade. An early Mesozoic diversification of Hypsimetopidae and related taxa along continental rifts in eastern Gondwana between Antarctica, India, and Australia is one implication of the phylogeny. Although the caves of Andhra Pradesh and other Indian states have biologically unique and scientifically important taxa, India provides no protection for any cave. This exposes the fauna to negative impacts such as quarrying or illegal mining, over-exploitation of water resources, and damage from unconstrained tourist visitation. Article in Journal/Newspaper Antarc* Antarctica Oxford University Press (via Crossref) Journal of Crustacean Biology 42 4 |
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Open Polar |
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Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Aquatic Science |
spellingShingle |
Aquatic Science Wilson, George D Shaik, Shabuddin Evidence for Early Mesozoic diversification of Hypsimetopidae Nicholls, 1943 (Isopoda), with the description of a new genus from Andhra Pradesh and notes on threats to Indian cave environments |
topic_facet |
Aquatic Science |
description |
Abstract A new phreatoicidean isopod, Speonastes venkataramanigen., sp. nov. is described from Borra Cave in northeastern Andhra Pradesh, India. This new taxon has features seen in most phreatoicideans such as ventrally projecting pleonal pleurae, but also has features characteristic of the hypogean family Hypsimetopidae, such as an elongated pleotelson with a medially rotating uropod that has protopodal denticles or denticulate setae opposing the denticulate margin of the pleotelson, as well as the distal article of the antennula being minute and the penultimate article elongated and somewhat inflated. Robustness-tested phylogenetic analyses of character data from exemplars from nearly all phreatoicidean genera and four non-phreatoicidean outgroups finds that this species is the earliest derived member of Hypsimetopidae. These analyses have substantial implications for both relationships among Phreatoicidea, but within the family as well. The body form of the Phreatoicidea basal to the hypsimetopid clade resembles the form seen in fossils or by recent taxa such as CrenisopusWilson & Keable, 1999. Ancestors of Speonastesgen. nov. may have independently colonized India from those of the Nichollsia-Andhracoides clade. An early Mesozoic diversification of Hypsimetopidae and related taxa along continental rifts in eastern Gondwana between Antarctica, India, and Australia is one implication of the phylogeny. Although the caves of Andhra Pradesh and other Indian states have biologically unique and scientifically important taxa, India provides no protection for any cave. This exposes the fauna to negative impacts such as quarrying or illegal mining, over-exploitation of water resources, and damage from unconstrained tourist visitation. |
author2 |
Department of Science and Technology, Ministry of Science and Technology, India Indian Ministry of Environment, Forests and Climate Change Australian Biological Resources Study |
format |
Article in Journal/Newspaper |
author |
Wilson, George D Shaik, Shabuddin |
author_facet |
Wilson, George D Shaik, Shabuddin |
author_sort |
Wilson, George D |
title |
Evidence for Early Mesozoic diversification of Hypsimetopidae Nicholls, 1943 (Isopoda), with the description of a new genus from Andhra Pradesh and notes on threats to Indian cave environments |
title_short |
Evidence for Early Mesozoic diversification of Hypsimetopidae Nicholls, 1943 (Isopoda), with the description of a new genus from Andhra Pradesh and notes on threats to Indian cave environments |
title_full |
Evidence for Early Mesozoic diversification of Hypsimetopidae Nicholls, 1943 (Isopoda), with the description of a new genus from Andhra Pradesh and notes on threats to Indian cave environments |
title_fullStr |
Evidence for Early Mesozoic diversification of Hypsimetopidae Nicholls, 1943 (Isopoda), with the description of a new genus from Andhra Pradesh and notes on threats to Indian cave environments |
title_full_unstemmed |
Evidence for Early Mesozoic diversification of Hypsimetopidae Nicholls, 1943 (Isopoda), with the description of a new genus from Andhra Pradesh and notes on threats to Indian cave environments |
title_sort |
evidence for early mesozoic diversification of hypsimetopidae nicholls, 1943 (isopoda), with the description of a new genus from andhra pradesh and notes on threats to indian cave environments |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/jcbiol/ruac052 https://academic.oup.com/jcb/article-pdf/42/4/ruac052/47589299/ruac052.pdf |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Journal of Crustacean Biology volume 42, issue 4 ISSN 0278-0372 1937-240X |
op_rights |
https://academic.oup.com/pages/standard-publication-reuse-rights |
op_doi |
https://doi.org/10.1093/jcbiol/ruac052 |
container_title |
Journal of Crustacean Biology |
container_volume |
42 |
container_issue |
4 |
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1786844402543493120 |