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Related Concept Videos

Taxonomy01:31

Taxonomy

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Taxonomy is the science of defining and naming groups of biological organisms based on shared characteristics. It uses a hierarchy of increasingly inclusive categories with Latin names. The smallest units of taxonomy, species and genus, are used to assign a formal, taxonomic name to each species in a system. This classification system, referred to as binomial nomenclature, was formalized by Carolus Linnaeus in the 18th century.
Hierarchy of Taxonomy
The hierarchy that Carolus Linnaeus first...
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Microtubules in Signaling01:22

Microtubules in Signaling

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The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
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Centrioles and Centrosomes01:13

Centrioles and Centrosomes

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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
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Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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Catenins01:23

Catenins

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Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
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Ctenophora: Illustrated Guide and Taxonomy.

Leonid L Moroz1, Richard Collins2, Gustav Paulay3

  • 1Whitney Laboratory for Marine Bioscience, Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA. moroz@whitney.ufl.edu.

Methods in Molecular Biology (Clifton, N.J.)
|April 26, 2024
PubMed
Summary

Ctenophores, or comb jellies, are basal animals crucial for understanding early evolution. This study reviews their taxonomy, highlighting conflicts with phylogenetic data and illustrating their diverse species.

Keywords:
Benthic ctenophoresBeroeBolinopsisCambrianCestumClassificationCtenophoraEuplokamisEvolutionFeedingFossilsMnemiopsisOcyropsisPhylogenyPlatyctenidaPleurobrachia

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Area of Science:

  • Marine Biology
  • Zoology
  • Evolutionary Biology

Background:

  • Ctenophores (comb jellies) represent the earliest diverging animal lineage, sister to all other Metazoa.
  • Their unique phylogenetic position makes them critical for understanding early animal evolution.
  • Despite their importance, ctenophore taxonomy and species diversity remain poorly understood.

Purpose of the Study:

  • To present a comprehensive checklist of the phylum Ctenophora.
  • To illustrate the diversity of ctenophores, including extant and fossil species.
  • To highlight discrepancies between current classification and recent phylogenetic findings.

Main Methods:

  • Review of current taxonomic literature on ctenophores.
  • Compilation of accepted species, families, and genera.
  • Inclusion of images to showcase ctenophore diversity.
  • Listing of recognized fossil species and controversial attributions.

Main Results:

  • A checklist of 185 currently accepted extant ctenophore species.
  • Illustrative examples covering most families and genera, plus undescribed species.
  • Identification of substantial conflicts between current classification and phylogenetic results.
  • Listing of 14 recognized fossil ctenophore species.

Conclusions:

  • The current classification of ctenophores requires revision due to phylogenetic conflicts.
  • Ctenophore adaptations offer critical insights into early animal evolution and adaptive radiation.
  • Further research is needed to resolve taxonomic uncertainties and understand their evolutionary significance.