Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

The Scaphopoda.

Patrick D Reynolds1

  • 1Biology Department, Hamilton College, Clinton, NY 13323, USA. preynold@hamilton.edu

Advances in Marine Biology
|July 4, 2002
PubMed
Summary
This summary is machine-generated.

Scaphopods, or tusk shells, are marine mollusks with unique feeding tentacles. Despite their global distribution and fossil record, their biology and evolutionary relationships remain poorly understood, presenting an opportunity for further research.

Related Experiment Videos

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same journal

Preface.

Advances in marine biology·2026
Same journal

Marine Annelida diversity and taxonomic knowledge in South Africa: A critical review.

Advances in marine biology·2026
Same journal

The tropicalisation of the Mediterranean Sea: A return to the past or an unprecedented future? A brief review and a chorological outlook.

Advances in marine biology·2026
Same journal

Preface.

Advances in marine biology·2025
Same journal

Sensory perception in marine larvae.

Advances in marine biology·2025
Same journal

Coral reefs as ocean-connected ecosystems: Impacts on food webs and reef futures under climate change.

Advances in marine biology·2025
See all related articles

Area of Science:

  • * Marine biology and malacology.
  • * Invertebrate zoology and evolutionary biology.

Background:

  • * Scaphopoda (tusk shells) are marine infaunal carnivores with a worldwide distribution.
  • * Despite their unique adaptations and fossil record, their biology is poorly understood compared to other mollusks.
  • * They exhibit a simplified molluscan organization, with lost organs like ctenidia and osphradium, and a decollated shell structure.

Purpose of the Study:

  • * To review the current state of knowledge on Scaphopoda biology, ecology, biogeography, and phylogeny.
  • * To highlight the challenges and opportunities in studying this enigmatic molluskan class.
  • * To emphasize the potential for future research, particularly in phylogenetics and diversity documentation.

Main Methods:

  • * Literature review of existing monographic works and recent studies.
  • * Analysis of morphological variation for phylogenetic reconstruction.
  • * Review of fossil record data and biogeographic patterns.
  • * Consideration of molecular data for phylogenetic insights.

Main Results:

  • * Scaphopods display unique feeding mechanisms (captacula) and shell morphology.
  • * Preliminary studies show depth and latitudinal gradients in diversity, with peaks at bathyal depths.
  • * Diverse symbiotic associations exist, alongside predation and shell inhabitation by other species.
  • * Phylogenetic placement within Mollusca remains unresolved, with ongoing efforts using morphological and molecular data.
  • * The fossil record dates back to the Carboniferous, showing distinct extinction and radiation events.

Conclusions:

  • * Scaphopoda represent a distinct evolutionary lineage within Mollusca, characterized by unique adaptations and a simplified body plan.
  • * Further research, especially comprehensive phylogenetic analyses and diversity documentation, is crucial for understanding their evolutionary history.
  • * The class offers a tractable model for studying molluscan evolution due to its fossil record and distinct characteristics.