期刊
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
卷 194, 期 4, 页码 1252-1267出版社
OXFORD UNIV PRESS
DOI: 10.1093/zoolinnean/zlab023
关键词
biogeography; divergence-time; homoplasy; phylogenetics; sand-burrowing; taxonomy
类别
资金
- Ecology & Evolutionary Biology (EEB) program at Texas AM University
- Texas Sea Grant
- Texas Ecolabs
In this study, the systematics and phylogenetics of Haustoriid amphipods were examined, revealing Haustoriidae as basal gammarids and dispersal of other families within 'Haustoriidira' across Amphipoda. The research also found that the Pacific-endemic genus Eohaustorius is the most basal haustoriid and separated from the rest of the family around 31 Mya.
Haustoriid amphipods have received little recent attention and their systematics and phylogenetics are largely unresolved. Some efforts have been made at classifying the family within the broader Amphipoda, but there is persistent incongruence in its placement among different authors and techniques. Furthermore, there exists no phylogenetic hypothesis of intrafamilial relationships. In this work, we evaluate the competing hypotheses on the phylogenetic position of the Haustoriidae within Amphipoda by examining new and previously published sequences of nearly 100 species across 38 families. We find strong support for the Haustoriidae as basal gammarids, and that other families placed within the parvorder 'Haustoriidira' are spread across Amphipoda. The radiation began during the Eocene and may have been driven in North America by the rapid filling of a coastal niche opened by the Chesapeake Bay impact crater. Unlike previous work, we find that the Pacific-endemic genus Eohaustorius is the most basal haustoriid, and that it separated from the rest of the family similar to 31 Mya. Finally, we provide taxonomic recommendations for relationships within Haustoriidae, including the elevation of a new genus, Cryptohaustorius gen. nov.. We conclude by recommending that the 'Haustoriidira' be abandoned.
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