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Abstract Seamounts in the Central Pacific Ocean remain largely unexplored. Squat lobsters, a major deep-sea invertebrate group, are poorly known in this area, whereas recent sampling efforts in the Western Pacific have resulted in a populated database of Galatheoidea Samouelle, 1819. Material recently collected by the E/V Nautilus during several expeditions to Central Pacific seamounts is reviewed herein, revealing the presence of 16 species. Ten species constitute geographic range expansions, and five are new taxa: Trapezionida herculessp. nov., T. tapinasp. nov., Typhlonida annieaesp. nov., Munidopsis giribetisp. nov., and M. nemosp. nov. Using 3D imaging via micro-CT scanning and molecular phylogenetic analysis of COI and 16S mitochondrial genes, these species are described and illustrated, and their phylogenetic positions are revealed. Several of the new species represent highly divergent lineages not closely related to known species, indicating a need to continue exploring the deep ocean in the Central Pacific. The study herein also describes the habitats and biological associations of these species, ranging from corals to chemosynthetic environments. The new data fill an important geographic gap in the distribution of squat lobster species and contribute to understanding the speciation processes and connectivity among seamounts in the Pacific Ocean.
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Cosmopolitan abyssal lineages? A systematic study of East Pacific deep-sea squat lobsters (Decapoda: Galatheoidea: Munidopsidae)
Munidopsid squat lobsters are among the most abundant decapods at abyssal depths and the most diverse squat lobster group in the East Pacific region. During recent cruises along the East Pacific, many deep-sea squat lobsters were collected. Among these, we described five new munidopsid species supported both by morphological characters and molecular phylogenetics: Munidopsis girguisisp. nov., M. nautilussp. nov., M. testudasp. nov., M. cortesisp. nov. and M. hendrickxisp. nov. We also report new records of several Munidopsis species across the East Pacific that increase the species distribution ranges. Here, we reconstructed the phylogenetic relationships of the East Pacific species in relation to other Galatheoidea using one nuclear and two mitochondrial gene fragment(s); we also performed single locus species delimitation analyses to explore the species status of various East Pacific munidopsid taxa. The new taxa were photographed, illustrated and imaged with micro-computed tomography. The phylogenetic results show that: (1) Janetogalathea californiensis, previously included in the family Galatheidae, nests within Munidopsidae; (2) the phylogenetic position of Phylladiorhynchus and Coralliogalathea as belonging in Galatheidae is not supported; and (3) Munidopsis is paraphyletic, agreeing with recent systematic hypotheses. Short genetic distances and species delimitation analyses suggested that a clade mostly constituted by abyssal species might include fewer species than currently considered, as species show a wider geographic range than previously considered, conforming with traditional hypotheses of cosmopolitanisms in abyssal species. ZooBank: urn:lsid:zoobank.org:pub:CED9EB18-7061-47A7-B2FF-7F1DAFCC7B12.
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- Award ID(s):
- 2001540
- PAR ID:
- 10676042
- Editor(s):
- Ahyong, Shane
- Publisher / Repository:
- CSIRO Publishing
- Date Published:
- Journal Name:
- Invertebrate Systematics
- Volume:
- 37
- Issue:
- 1
- ISSN:
- 1445-5226
- Page Range / eLocation ID:
- 14 to 60
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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- Free Publicly Accessible Full Text
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Accepted Manuscript
- Journal Article:
- https://doi.org/10.1071/IS22030
