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Phylogenetic relationship within Cumacea (Crustacea: Peracarida) and genetic variability of two Antarctic species of the family Leuconidae

Phylogenetic relationship within Cumacea (Crustacea: Peracarida) and genetic variability of two Antarctic species of the family Leuconidae
Phylogenetic relationship within Cumacea (Crustacea: Peracarida) and genetic variability of two Antarctic species of the family Leuconidae
Phylogenetic hypotheses for the peracarid order Cumacea are scarce and have not provided a solution to the full extent. In the present study, a fragment of the mitochondrial 16S rDNA was used to erect a phylogenetic hypothesis for three cumacean families, Diastylidae, Bodotriidae and Leuconidae, along with intra-family relationships of the latter. The Cumacea resolved monophyletic with tanaids and isopods as outgroup taxa. The Diastylidae were the only family with good support for monophyly. The genus Leucon resolved paraphyletic, whereas the subgenus Crymoleucon was monophyletic. Furthermore, the genetic structure was analysed for two leuconid species, Leucon antarcticus Zimmer, 1907 and L. intermedius Mühlenhardt-Siegel, 1996, from the Weddell Sea and the Ross Sea. The two species showed different patterns of intraspecific genetic variability. In contrast to L. intermedius, a bimodal distribution of pairwise genetic distances was observed for L. antarcticus, which is correlated with geographical and depth distributions between the Ross Sea and the Weddell Sea. Although a clear evaluation of cryptic speciation in these species requires additional work on more specimens from more geographic regions and broader depth ranges, differences shown in the sequences of 16S rDNA can only be explained by genetic separation of populations between the Weddell Sea and the Ross Sea for an extended period of time.
0214-8358
385-392
Rehm, Peter
d2a92d3d-9a5b-4706-b3f8-14e7ce022b40
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Leese, Florian
eb4436dd-5788-45bd-a54b-f6bee44d788f
Held, Christoph
a7302aef-af4c-442d-9433-ab2b480008b1
Rehm, Peter
d2a92d3d-9a5b-4706-b3f8-14e7ce022b40
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Leese, Florian
eb4436dd-5788-45bd-a54b-f6bee44d788f
Held, Christoph
a7302aef-af4c-442d-9433-ab2b480008b1

Rehm, Peter, Thatje, Sven, Leese, Florian and Held, Christoph (2020) Phylogenetic relationship within Cumacea (Crustacea: Peracarida) and genetic variability of two Antarctic species of the family Leuconidae. Scientia Marina, 84 (4), 385-392. (doi:10.3989/scimar.05053.17A).

Record type: Article

Abstract

Phylogenetic hypotheses for the peracarid order Cumacea are scarce and have not provided a solution to the full extent. In the present study, a fragment of the mitochondrial 16S rDNA was used to erect a phylogenetic hypothesis for three cumacean families, Diastylidae, Bodotriidae and Leuconidae, along with intra-family relationships of the latter. The Cumacea resolved monophyletic with tanaids and isopods as outgroup taxa. The Diastylidae were the only family with good support for monophyly. The genus Leucon resolved paraphyletic, whereas the subgenus Crymoleucon was monophyletic. Furthermore, the genetic structure was analysed for two leuconid species, Leucon antarcticus Zimmer, 1907 and L. intermedius Mühlenhardt-Siegel, 1996, from the Weddell Sea and the Ross Sea. The two species showed different patterns of intraspecific genetic variability. In contrast to L. intermedius, a bimodal distribution of pairwise genetic distances was observed for L. antarcticus, which is correlated with geographical and depth distributions between the Ross Sea and the Weddell Sea. Although a clear evaluation of cryptic speciation in these species requires additional work on more specimens from more geographic regions and broader depth ranges, differences shown in the sequences of 16S rDNA can only be explained by genetic separation of populations between the Weddell Sea and the Ross Sea for an extended period of time.

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Published date: 11 December 2020

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Local EPrints ID: 446175
URI: http://eprints.soton.ac.uk/id/eprint/446175
ISSN: 0214-8358
PURE UUID: 0c509c81-5c55-4bc5-b7dd-f9ef68fad1c3

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Date deposited: 26 Jan 2021 17:31
Last modified: 25 Nov 2021 19:38

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Author: Peter Rehm
Author: Sven Thatje
Author: Florian Leese
Author: Christoph Held

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