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  1. Hermaphroditic
    Reproduction in chaetognaths is unique. All chaetognaths are hermaphroditic, meaning they have both male and female parts. Eggs are formed in the trunk region of the body, whereas the sperm develop in the tail portion. Sperm can sometimes be seen swimming inside the tail portion of the body.

    chaetognatha.html - UW Departments Web Server

    depts.washington.edu/fhl/zoo432/plankton/plchaetognatha/chaetognatha.html
    depts.washington.edu/fhl/zoo432/plankton/plchaetognatha/chaetognatha.html
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  2. People also ask
    Do chaetognaths reproduce sexually?
    Chaetognaths reproduce sexually and are hermaphroditic, with individuals possessing both a pair of seminal vesicles and receptacles (Ghirardelli, 1969; Goto & Yoshida, 1985; Pierrot-Bults, 1976 ).

    Diversity, seasonal abundance, and environmental drivers of chaetognath

    onlinelibrary.wiley.com
    Are Chaetognatha male or female?
    All known Chaetognatha are hermaphrodites, meaning they possess both male and female sex organs. The female organs, the ovaries, are located in the hind part of the trunk, while the male sexual organs, the testis, are located in the tail.

    Phylum Chaetognatha (The Arrow Worms) | Earth Life

    earthlife.net
    How have chaetognaths evolved?
    Moreover, chaetognaths have mostly evolved by simplification of their body plan and their history shows numerous convergent events of losses and reversions. The main morphological novelty observed is the acquisition of a second pair of lateral fins in Sagittidae, which represents an adaptation to the holoplanktonic niche.

    Evolutionary history of Chaetognatha inferred from molecular and

    frontiersinzoology.biomedcentral.com
    How did the phylogeny of Chaetognatha evolve?
    This new phylogeny also includes resurrected and modified genera within Sagittidae. The distribution of some morphological characters traditionally used in systematics and for species diagnosis suggests that the diversity in Chaetognatha was produced through a process of mosaic evolution.

    Evolutionary history of Chaetognatha inferred from molecular and

    frontiersinzoology.biomedcentral.com
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  3. See more
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    Wikipedia
    https://en.wikipedia.org/wiki/Chaetognatha

    Chaetognatha - Wikipedia

    All species are hermaphroditic, carrying both eggs and sperm. Each animal possesses a pair of testes within the tail, and a pair of ovaries in the posterior region of the main body cavity. Immature sperm are released from the testes to mature inside the cavity of the tail, and then swim through a … See more

    Anatomy image
    Overview

    The Chaetognatha /kiːˈtɒɡnəθə/ or chaetognaths /ˈkiːtɒɡnæθs/ (meaning bristle-jaws) are a phylum of predatory marine worms that … See more

    Anatomy

    Chaetognaths are transparent or translucent dart-shaped animals covered by a cuticle. They range in length between 1.5 mm to 105 mm in the Antarctic … See more

    Phylogeny image
    Behaviour

    Little is known of arrow worms' behaviour and physiology, due to the complexity in culturing them and reconstructing their natural habitat. It is … See more

    Ecology

    Chaetognaths are found in all world's oceans, from the poles to tropics, and also in brackish and estuarine waters. They inhabit very diverse … See more

    Genetics

    Mitochondrial genome
    The mtDNA of the arrow worm Spadella cephaloptera has been sequenced in 2004, and at the … See more

    Phylogeny

    External
    The evolutionary relationships of chaetognaths have long been enigmatic. Charles Darwin remarked that arrow worms were … See more

    Fossil record

    Due to their soft bodies, chaetognaths fossilize poorly. Even so, several fossil chaetognath species have been described. … See more

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  4. ADW
    https://animaldiversity.org/accounts/Chaetognatha

    ADW: Chaetognatha: INFORMATION

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    Phylum Chaetognatha: History, Features and Affinities - …
    biologydiscussion.com
    (PDF) CHAETOGNATHA - ResearchGate
    researchgate.net
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  5. Images of Chaetognatha Reproduction

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  6. Springer
    https://link.springer.com/chapter/10.1007/978-3-7091-1862-7_10

    Chaetognatha | SpringerLink

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    The Unique Embryology of Chaetognatha - ResearchGate
    researchgate.net
    Chaetognatha - an overview | ScienceDirect Topics
    sciencedirect.com
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  7. Earth Life
    https://earthlife.net/phylum-chaetognatha-arr…

    Phylum Chaetognatha (The Arrow Worms) | Earth Life

    WEBMar 2, 2020 · Reproduction in the Chaetognatha. All known Chaetognatha are hermaphrodites, meaning they possess both male and female sex organs. The female organs, the ovaries, are located in the hind part of …

    Tags:
    Chaetognatha
    Arrow Worms
  8. Wiley Online Library
    https://onlinelibrary.wiley.com/doi/10.1002/ece3.10151

    Diversity, seasonal abundance, and environmental drivers of …

  9. Frontiers in Zoology
    https://frontiersinzoology.biomedcentral.com/articles/10.1186/s12983...

    Evolutionary history of Chaetognatha inferred from …

    Tags:
    Chaetognatha Number of Species
    Chaetognatha Taxonomy
    Chaetognatha Inferida
  10. Oxford Academic
    https://academic.oup.com/book/25513/chapter/192775156

    Chaetognatha | Marine Plankton: A practical guide to ecology ...

  11. Science | AAAS
    https://www.science.org/doi/10.1126/sciadv.adi6678

    A giant stem-group chaetognath | Science Advances

  12. MDPI
    https://www.mdpi.com/2077-1312/9/12/1397

    The Sizes, Growth and Reproduction of Arrow Worms …

    WEBDec 7, 2021 · Reproduction in Chaetognaths. Figure 6, based on Table 5, shows that in chaetognaths, Lmax, when plotted vs. Lm in a regression with zero intercept, leads to a slope of 1.30, which is close to the estimate of …

    Tags:
    Chaetognatha
    Arrow Worms
  13. Oxford Academic
    https://academic.oup.com/book/53176/chapter/422001095

    Growth and Reproduction | The Biology of Chaetognaths - Oxford …