Molecular phylogeny of caridean shrimps in families Alpheidae and Crangonidae (Crustacea: Decapoda)
M.Phil. Caridean shrimps are the second most speciose group of Decapoda, comprising over 3,400 extant species worldwide. Of which, Alpheidae and Crangonidae are the second and fourth largest families with striking morphological and ecological diversities. In spite of considerable effort, phylogeneti...
| Other Authors: | , , |
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| Format: | Text |
| Language: | English Chinese |
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2019
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| Online Access: | https://julac.hosted.exlibrisgroup.com/primo-explore/search?query=addsrcrid,exact,991039842694103407,AND&tab=default_tab&search_scope=All&vid=CUHK&mode=advanced&lang=en_US https://repository.lib.cuhk.edu.hk/en/item/cuhk-2327260 |
| Summary: | M.Phil. Caridean shrimps are the second most speciose group of Decapoda, comprising over 3,400 extant species worldwide. Of which, Alpheidae and Crangonidae are the second and fourth largest families with striking morphological and ecological diversities. In spite of considerable effort, phylogenetic relationships within these two hyperdiverse families remain unclear. In this study, we reconstruct the most comprehensive and robust phylogeny for each family, based on a combined dataset of two mitochondrial (12S and 16S rDNA) and five nuclear protein-coding gene markers (histone H3, sodium-potassium ATPase a-subunit, enolase, phosphoenolpyruvate carboxykinase and glyceraldehyde 3-phosphate dehydrogenase). In the first part of this thesis, we present the first molecular phylogeny of Crangonidae, with the aim of elucidating its intergeneric relationships, assessing the taxonomic status of the constituent genera and reconstructing its biogeographic history. The inferred phylogeny, including over 95% of the extant genera in this family, strongly supports Crangonidae as a monophyletic assemblage. Our results also unveil the non-monophyly of Aegaeon and Philocheras. In view of both morphological and molecular evidence, we propose the erection of a new genus to accommodate three Aegaeon species. Based on the ancestral range reconstruction, we show that Crangonidae originated in the tropical Indo-West Pacific region during middle Jurassic (~ 166 Ma). Subsequently, formation of the Central Atlantic Ocean and Tethys Seaway allows active dispersals to tropical Atlantic and Temperate Northern Atlantic oceans throughout Cretaceous and Paleogene (118 - 27 Ma). Colonization of the Central American region then served as a vital stepping stone for the northward dispersals to Temperate Northern Pacific and Arctic oceans during Paleocene-Eocene Thermal Maximum (~ 55 Ma). In the second part of this thesis, we attempt to untangle the phylogenetic relationships among 29 alpheid genera and put forward tentative taxonomic ... |
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