Smithsonian Marine Station at Fort Pierce

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Adult Baseodiscus delineatus. Typical adult size is 8 cm. Photo courtesy of: Newman & Flowers, Smithsonian Institution (NMNH).

Species Name: Baseodiscus delineatus Delle Chiaje, 1825
Common Name: None
Synonymy: None
  1. TAXONOMY

    Kingdom Phylum/Division Class: Order: Family: Genus:
    Animalia Nemertea Anopla Heteronemertea Baseodiscidae Baseodiscus
  2. HABITAT AND DISTRIBUTION

    IRL Distribution

    B. delineatus is distributed throughout the Indian River Lagoon

  3. LIFE HISTORY AND POPULATION BIOLOGY

    Age, Size, Lifespan

    Maturation age and longevity are not known for Baseodiscus delineatus. Typical and maximum adult size for males and females of this species are 80 mm and 200 mm respectively.

    Abundance

    Baseodiscus delineatus is considered to be abundant.

    Reproduction

    Baseodiscus delineatus is gonochoristic with external outcross fertilization.

    Embryology

    Egg and the pilidium larva of Baseodiscus delineatus are planktonic.

  4. PHYSICAL TOLERANCES

    Temperature

    Baseodiscus delineatus is eurythermal.  Those B. lineatus occurring at Jim Island near Fort Pierce Inlet in the Indian River Lagoon, tolerate summer water temperatures in excess of 30°C, and winter water temperatures which often dip below 17°C for short periods of time.

    Salinity

    B. lineatus is a euryhaline species. In the Indian River Lagoon, salinity may approach near-freshwater conditions at times during rainy summer months; while in winter, conditions may remain near pure seawater.

  5. COMMUNITY ECOLOGY

    Trophic Mode

    Trophic mode of the larva of Baseodiscus delineatus is not known, but both the juvenile and adult stages are carnivorous, probably preying on annelids

    Habitat

    Baseodiscus delineatus is epibenthic, occurring in gravel, cobble, and shell of oyster reefs and marina pilings in the intertidal zone.  A closely related species, B. edlineatus is known to withstand moderate wave exposure.

  6. ADDITIONAL INFORMATION

    No information is available at this time

  7. REFERENCES

    No information is available at this time

Report by: J. Dineen, Smithsonian Marine Station with thanks to L. Newman
Submit additional information, photos or comments to:
irl_webmaster@si.edu
Page last updated: July 25, 2001

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