Evolutionary history of Chaetognatha inferred from molecular and ...
The species studied in the present report belong to the Aphragmophora (Sagittidae, Krohnittidae and Pterosagittidae) and Phragmophora which have been divided in Biphragmophora (Heterokrohniidae) and Monophragmophora (Spadellidae and Eukrohniidae) . We were therefore able to discuss the evolutionary … See more
The clade Sagittidae?+?P. draco as sister group to Krohnittidae is highly supported by our molecular and morphological cladistic analyses and revives the … See more
The morphological analysis supports the division of Chaetognatha into three monophyletic groups, the Biphragmophora, Monophragmophora and Aphragmophora … See more
Despite the complexity of the distribution of some morphological characters, which poses problems when assessing the relationships within Sagittidae, most of … See more
It is likely that all Aphragmophora and Eukrohniidae lineages are morphologically highly similar because of their holoplanktonic lifestyle in the pelagos , … See more
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Chaetognatha - Wikipedia
The evolutionary relationships of chaetognaths have long been enigmatic. Charles Darwin remarked that arrow worms were "remarkable for the obscurity of their affinities". Chaetognaths in the past have been traditionally, but erroneously, classed as deuterostomes by embryologists due to deuterostome-like features in the embryo. Lynn Margulis and K. V. Schwartz placed chaetognath…
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Phylogeny: The Continuing Classificatory Conundrum of …
WebAug 8, 2006 · Phylogeny: The Continuing Classificatory Conundrum of Chaetognaths. The phylogenetic conundrum posed by the Chaetognatha, a cryptic phylum consisting largely of planktonic predators, is the subject of two short papers in …
A giant stem-group chaetognath | Science Advances
Web3 Jan 2024. Vol 10, Issue 1. DOI: 10.1126/sciadv.adi6678. Abstract. Chaetognaths, with their characteristic grasping spines, are the oldest known pelagic predators, found in the lowest Cambrian (Terreneuvian).
RESEARCH Open Access Evolutionary history of Chaetognatha …
WebChaetognaths are particularly renowned for their peculiar morphological and developmental features. These characters, as well as the affinities of the group within the metazoans, have been extensively debated by zoologists since the discovery of the phylum in the 18th century [4].
Chaetognatha | SpringerLink
WebDespite the ever-increasing number of molecular phylogenetic studies and an emerging consensus for protostome affinities based on broad phylogenomic datasets, today the relationships of the Chaetognatha are still among the most enigmatic issues of metazoan phylogeny (reviewed in Perez et al. 2014).
Phylum Chaetognatha | Animal Evolution: Interrelationships of the ...
WebMolecular phylogeny indicates many different positions for the Chaetognatha: ‘between’ Protostomia and Deuterostomia, for example, or as sister group of Lophotrochozoa + Ecdysozoa. On the basis of structure, embryology, and the Hox genes, the chaetognaths are a basal protostomian group.
The Mystery of the Chaetognatha: A Molecular Phylogenetic …
WebThe phylum Chaetognatha is a mysterious group of organisms that has eluded scientists for more than a century because of their unique morphology and developmental characteristics, i.e. protostome (mouth develops from blastopore; e.g. mollusks, annelids, arthropods) versus deuterostome (anus develops from blastopore; e.g. echinoderms and ...
Phylogeny: The Continuing Classificatory Conundrum of …
WebPhylogeny: The Continuing Classificatory Conundrum of Chaetognaths The phylogenetic conundrum posed by the Chaetognatha, a cryptic phylum consisting largely of planktonic predators, is the subject of two short papers in this issue of Current Biology. These analyses go some way towards defining the phylogenetic position of the …
Chaetognatha 10 - Springer
WebChaetognatha are still among the most enigmatic issues of metazoan phylogeny (reviewed in Perez et al. 2014 ). The chaetognath genome is likely the product of a unique evolutionary history and stands for the long isolation of this group. Furthermore, morphological characters indi-cate a long evolutionary distance that separates
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