Crustaceans from bitumen clast in Carboniferous glacial diamictite extend fossil record of copepods

Selden, Paul A.; Huys, Rony; Stephenson, Michael H.; Heward, Alan P.; Taylor, Paul N.

doi:10.1038/ncomms1049

Cited by 74 publications

(42 citation statements)

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“…Divergence time estimations in this study are in good agreement with these known fossil records [84–87]. Recently, a new fossil of freshwater harpacticoids (most likely Canthocamptidae) has been found in carboniferous bitumen, dating back to at least 303 MYA [86]. Interestingly, the origin of T. californicus assumed in this study is almost congruent with this fossil record (Fig.…”

Section: Discussionsupporting

confidence: 88%

Phylogenomic analysis of Copepoda (Arthropoda, Crustacea) reveals unexpected similarities with earlier proposed morphological phylogenies

Eyun

2017

BMC Evol Biol

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BackgroundCopepods play a critical role in marine ecosystems but have been poorly investigated in phylogenetic studies. Morphological evidence supports the monophyly of copepods, whereas interordinal relationships continue to be debated. In particular, the phylogenetic position of the order Harpacticoida is still ambiguous and inconsistent among studies. Until now, a small number of molecular studies have been done using only a limited number or even partial genes and thus there is so far no consensus at the order-level.ResultsThis study attempted to resolve phylogenetic relationships among and within four major copepod orders including Harpacticoida and the phylogenetic position of Copepoda among five other crustacean groups (Anostraca, Cladocera, Sessilia, Amphipoda, and Decapoda) using 24 nuclear protein-coding genes. Phylogenomics has confirmed the monophyly of Copepoda and Podoplea. However, this study reveals surprising differences with the majority of the copepod phylogenies and unexpected similarities with postembryonic characters and earlier proposed morphological phylogenies; More precisely, Cyclopoida is more closely related to Siphonostomatoida than to Harpacticoida which is likely the most basally-branching group of Podoplea. Divergence time estimation suggests that the origin of Harpacticoida can be traced back to the Devonian, corresponding well with recently discovered fossil evidence. Copepoda has a close affinity to the clade of Malacostraca and Thecostraca but not to Branchiopoda. This result supports the hypothesis of the newly proposed clades, Communostraca, Multicrustacea, and Allotriocarida but further challenges the validity of Hexanauplia and Vericrustacea.ConclusionsThe first phylogenomic study of Copepoda provides new insights into taxonomic relationships and represents a valuable resource that improves our understanding of copepod evolution and their wide range of ecological adaptations.Electronic supplementary materialThe online version of this article (doi:10.1186/s12862-017-0883-5) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 88%

Phylogenomic analysis of Copepoda (Arthropoda, Crustacea) reveals unexpected similarities with earlier proposed morphological phylogenies

Eyun

2017

BMC Evol Biol

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“…These analyses do not conflict stratigraphically with a crown assignment 1598 for the Pennsylvanian fossils(Selden et al, 2010). Therefore we must caution that a Cretaceous age 1599 is likely a severe underestimate of crown copepod antiquity.…”

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confidence: 88%

Fossil calibrations for the arthropod Tree of Life

Wolfe

Daley

Legg

et al. 2016

Earth-Science Reviews

183

139

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14Fossil age data and molecular sequences are increasingly combined to establish a timescale for the 15 Tree of Life. Arthropods, as the most species-rich and morphologically disparate animal phylum, have 16 received substantial attention, particularly with regard to questions such as the timing of habitat shifts 17 (e.g. terrestrialisation), genome evolution (e.g. gene family duplication and functional evolution), 18 origins of novel characters and behaviours (e.g. wings and flight, venom, silk), biogeography, rate of 19 diversification (e.g. Cambrian explosion, insect coevolution with angiosperms, evolution of crab body 20 plans), and the evolution of arthropod microbiomes. We present herein a series of rigorously vetted 21 calibration fossils for arthropod evolutionary history, taking into account recently published guidelines 22 for best practice in fossil calibration. These are restricted to Palaeozoic and Mesozoic fossils, no 23 deeper than ordinal taxonomic level, nonetheless resulting in 80 fossil calibrations for 102 clades. This 24 work is especially timely owing to the rapid growth of molecular sequence data and the fact that many 25 included fossils have been described within the last five years. This contribution provides a resource 26 A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 2 for systematists and other biologists interested in deep-time questions in arthropod evolution.

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“…According to Corgosinho et al (2012), three genera of Parastenocarididae originated in Gondwana, i.e., Kinnecaris, Siolicaris Jakobi (1972) and Remaneicaris Jakobi (1972). In particular, the genus Kinnecaris had so far been found in Africa, the Oriental region sensu Morrone (2002) and Australia (Schminke 2008;Ranga Reddy & Schminke 2009;Karanovic & Cooper 2011) and, due to the ancient origin of harpacticoids (e.g., 310 Ma according to Selden et al 2010), it is plausible to assume that parastenocaridids occurred on the Gondwana landmass prior to its breakup, and justify the present distribution in all continents (excluded, presently, Antarctica) through vicariance events. However, it is not possible to disprove that short-term dispersal could have led to the present distribution of some taxa of this family.…”

Section: Distributionmentioning

confidence: 99%

First record ofKinnecaris(Copepoda: Harpacticoida: Parastenocarididae) from Turkey and Thailand; description of three new species and emended definition of the genus

Bruno

Cottarelli

2015

Italian Journal of Zoology

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Three new species of hyporheic Parastenocarididae from Turkey and Thailand are described in this paper, based on their morphological features. Kinnecaris xanthi sp. nov. and Kinnecaris draconis sp. nov. were collected in Anatolic Turkey, respectively from one and two rivers; Kinnecaris iulianae sp. nov. was collected from several streams on Pha-Ngan Island (Thailand). The two new species from Turkey both lack the typical pitted integument and their P5 fused with the intercoxal sclerite in both sexes; they share a similar shape of the caudal rami in both sexes and of P4 in male. They differ in the ornamentation of the genital double-somite and the armature of A1 in females; in the ornamentation of the anal operculum; in the shape of P2 endopod of both sexes, and P3 endopod of females; in the ornamentation of the first exopodal segment of P3 in males, and in the armature of P4 endopod in females. Kinnecaris iulianae sp. nov. shares with the other species from the Oriental and Australian Region the presence of a pitted cuticle, the size and shape of caudal rami and the shape and ornamentation of P3 in the males, and is characterized by the ventral ornamentation of the genital double-somite and urosomites of the females, and by the lack of ornamentation at the insertion of the P4 endopod of both sexes. The descriptions of these three new Kinnecaris widen the distribution of the genus which, so far, was considered Gondwanian. In this paper, we also re-examine the diagnostic characters of the genus and their presence and/or variability in the known species of Kinnecaris, discuss the taxonomic position of Kinnecaris lyncaea and emend the genus diagnosis.

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Crustaceans from bitumen clast in Carboniferous glacial diamictite extend fossil record of copepods

Cited by 74 publications

References 47 publications

Phylogenomic analysis of Copepoda (Arthropoda, Crustacea) reveals unexpected similarities with earlier proposed morphological phylogenies

Phylogenomic analysis of Copepoda (Arthropoda, Crustacea) reveals unexpected similarities with earlier proposed morphological phylogenies

Fossil calibrations for the arthropod Tree of Life

First record ofKinnecaris(Copepoda: Harpacticoida: Parastenocarididae) from Turkey and Thailand; description of three new species and emended definition of the genus

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