New finding of Mesozoic ephippia of the Anomopoda (Crustacea: Cladocera)

@article{Kotov2009NewFO,
  title={New finding of Mesozoic ephippia of the Anomopoda (Crustacea: Cladocera)},
  author={Alexey A. Kotov},
  journal={Journal of Natural History},
  year={2009},
  volume={43},
  pages={523 - 528}
}
  • A. Kotov
  • Published 1 March 2009
  • Geology
  • Journal of Natural History
Fossil Mesozoic anomopods (Crustacea: Cladocera) have only been found twice previously, although this group apparently differentiated in the Palaeozoic. This paper describes the finding of anomopod ephippia of three different types in the locality Khutel‐Khara, Mongolia (Lower Cretaceous, 129±9 Mya). This discovery demonstrates once more that the idea of rarity of cladocerans in Mesozoic fossils was motivated by insufficient attention of carcinologists to such fossils. 

Ephippia of Cladocera (Crustacea: Branchiopoda) from the Oligocene Tremembé palaeolake, Brazil

This find represents the oldest record of fossil ephippia in South America and the second record of Daphnia (Ctenodaphnia) in the former Gondwana.

Ephippia belonging to Ceriodaphnia Dana, 1853 (Cladocera: Anomopoda: Daphniidae) from the Lower Cretaceous of Australia

The first fossil ephippia (cladoceran exuvia containing resting eggs) belonging to the extant genus Ceriodaphnia are reported from the Lower Cretaceous Koonwarra Fossil Bed, South Gippsland, Victoria, Australia, which suggests that the early radiation of daphniid anomopods predates the breakup of Pangaea.

The Origin of Cladocera (Crustacea, Branchiopoda): A New Understanding of an Old Hypothesis

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Mesozoic fossils (>145 Mya) suggest the antiquity of the subgenera of Daphnia and their coevolution with chaoborid predators

The findings indicate that the main subgenera of Daphnia are likely much older than previously known from fossils (at least 100 MY older) or from nuclear DNA estimates of divergence, which suggests that vicariance from the breakup of Pangaea is an unlikely explanation for the origin of the mainSubgenera.

Ephippia of the Daphniidae ( Branchiopoda : Cladocera ) in Late Caenozoic deposits : untapped source of information for palaeoenvironment reconstructions in the Northern Holarctic

Cladoceran remains, mostly ephippia of the Daphniidae (Crustacea: Branchiopoda), are widespread in the permafrost deposits of Northern Eurasia. We may expect their presence in all types of Quaternary

Redescription of Limnosida frontosa Sars, 1862 (Crustacea: Cladocera: Sididae), with evidence of possible incipient species differentiation.

The low level of intraspecies differentiation and comparatively limited geographic distribution of this species imply its young age while the genus Limnosida itself is presumed ancient, which may be the result of both geographic disjunction and adaptation to waters of different trophic status.

Cyclestheria hislopi (Crustacea: Branchiopoda): a group of morphologically cryptic species with origins in the Cretaceous.

Tropical Amphi-Pacific disjunctions in the Cladocera (Crustacea: Branchiopoda)

It is proposed that a comparison with biogeographical hypotheses of plants, may provide useful analogies when studying anomopod biogeography, because ephippia, the propagules for dispersal, functionally act as minute aquatic plant seeds.

References

SHOWING 1-10 OF 22 REFERENCES

Mesozoic Anomopoda (Crustacea) from Mongolia

Material from the Early Cretaceous age collected 6 km west of the Hotont Somon (Mongolia) includes numerous impressions of Anomopoda that demonstrate that the prochydorid-type of organization is geologically ancient.

First record of fossil Mesozoic Ctenopoda (Crustacea, Cladocera)

Fossil specimens of ctenopods from two localities in Mongolia support a pre-Cretaceous origin for cladocerans and are assigned to a new genus and species, Archelatona zherikhini.

Global diversity of cladocerans (Cladocera; Crustacea) in freshwater

Cladocera is a primarily-freshwater monophyletic group, an important component of the microcrustacean zooplankton. They inhabit most types of continental fresh and saline water habitats, occurring

Phylogeny and adaptive radiation within the Anomopoda: a preliminary exploration

The distinctness of the Anomopoda and the polyphyletic nature of the so-called Cladocera are emphasized and an outline of the suggested phylogeny of the order is indicated.

A revision of the extinct Mesozoic family Prochydoridae Smirnov, 1992 (Crustacea: Cladocera) with a discussion of its phylogenetic position

Evidence is presented that the Prochydoridae form a specific lineage of cladocerans either separate from or basal to the order Anomopoda Sars, 1865, Nevertheless, a definitive conclusion of phylogenetic position awaits description of the prochydOrid thoracic limbs, which are currently unknown.

The evolutionary history of the Chydoridae (Crustacea: Cladocera)

This study examines the phylogenetic history of 37 chydorid species using sequence variation in two mitochondrial genes, COI and 16S r DNA, and one nuclear gene, 18S rDNA to suggest that they originated somewhere in the mid-Palaeozoic.

A revision of the Scapholeberinae (Crustacea: Cladocera)

A phylogeny of the subfamily is proposed, with Megafenestra as the more primitive genus, closely allied to Ceriodaphnia, and within Scapholeberis, S. mucronata as the most apomorphic species.

Morphology and postembryonic development of males and females of Bosmina longispina Leydig (Crustacea, Anomopoda) from a North Iceland population

In juvenile males of B. longispina (belonging to subgenus Eubosmina), characteristics of morphology, similar to those in adult males of other subgenera are found.

Dumontia oregonensis n. fam., n. gen., n. sp., a cladoceran representing a new family of `Water-fleas' (Crustacea, Anomopoda) from U.S.A., with notes on the classification of the Order Anomopoda

A detailed examination of the trunk limbs showed that the new species lacks the scraper-setae typically observed in all members of the recently erected suborder Radopoda, to which macrothricids belong, and limb morphology suggests a closer relation of Dumontiidae to the family Daphniidae.

Notothrix halsei gen. n., sp. n., representative of a new family of freshwater cladocerans (Branchiopoda, Anomopoda) from SW Australia, with a discussion of ancestral traits and a preliminary molecular phylogeny of the order

Analysis of the complete 18S (SSU) rRNA gene sequence including taxa from all but four anomopod families and using Ctenopoda as an outgroup, confirms the separation of the new taxon, the Nototrichidae fam.