Overview

Comprehensive Description

Description

 Six specimens up to about 50 mm long, 2 mm wide; dorsoventrally flattened; cephalic lobe broadly rounded. Milky ground color; dorsally with abundant short interrupted reddish to brown longitudinal lines, paler or completely absent on ventral surface. Shallow, cerebral organ furrows post-cerebral, vertical and slightly oblique, with inconspicuous, orthogonally oriented secondary furrows. Numerous ocelli arranged irregularly along antero-lateral margin of head. Mouth ventral, posterior to cerebral organ furrows. Proboscis pore at anterior of head; proboscis short and thin.
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© Jaime Gonzalez-Cueto, Sigmer Quiroga, Jon Norenburg

Source: ZooKeys

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Distribution

 This species seems to be circumglobal in tropical and subtropical seas (Norenburg 2009). 
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© Jaime Gonzalez-Cueto, Sigmer Quiroga, Jon Norenburg

Source: ZooKeys

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Indian River Lagoon (Fort Pierce, Florida, USA)

(from the Allan Hancock Pacific expeditions 1935-1940)

One of the most widely distributed of all species of nemerteans, being reported from both Northern and Southern hemi-spheres and under widely diverse temperature conditions; Mediterranean to Cape Verde Islands, Mauritius, Fiji Islands, Barbados, Bermuda, Chile, Gulf of California.

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© Ritger, Rebecca

Source: Nemertea

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B. delineatus is distributed throughout the Indian River Lagoon
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© Smithsonian Marine Station at Fort Pierce

Source: Indian River Lagoon Species Inventory

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Physical Description

Size

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.
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© Smithsonian Marine Station at Fort Pierce

Source: Indian River Lagoon Species Inventory

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Up to 8 cm in length

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© Ritger, Rebecca

Source: Nemertea

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Diagnostic Description

Diagnosis

(from the Allan Hancock Pacific expeditions 1935-1940)

Without white rings; longitudinally striated with numerous interrupted and irregularly anastomosing, very narrow black or dark brown lines.

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© Ritger, Rebecca

Source: Nemertea

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Ecology

Habitat

An epibenthic species found in intertidal gravel, shell hash of oyster reefs, dock pilings.

(from the Allan Hancock Pacific expeditions 1935-1940)

Beneath stones and among corals and other growths as well as in sand near low-water mark and below.

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© Ritger, Rebecca

Source: Nemertea

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Depth range based on 2 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 47 - 47
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Trophic Strategy

Trophic mode of the larva of Baseodiscus delineatus is not known, but both the juvenile and adult stages are carnivorous, probably preying on annelidsHabitat: 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.
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© Smithsonian Marine Station at Fort Pierce

Source: Indian River Lagoon Species Inventory

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Associations

Known Prey Organisms

annelid worms

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© Ritger, Rebecca

Source: Nemertea

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Population Biology

Baseodiscus delineatus is considered to be abundant.
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© Smithsonian Marine Station at Fort Pierce

Source: Indian River Lagoon Species Inventory

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Life History and Behavior

Reproduction

Reproduction and Development

Gonochoristic with external outcross fertilization. Planktonic pilidium larvae

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© Ritger, Rebecca

Source: Nemertea

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Baseodiscus delineatus is gonochoristic with external outcross fertilization.
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© Smithsonian Marine Station at Fort Pierce

Source: Indian River Lagoon Species Inventory

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Growth

Egg and the pilidium larva of Baseodiscus delineatus are planktonic.
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© Smithsonian Marine Station at Fort Pierce

Source: Indian River Lagoon Species Inventory

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Physiology and Cell Biology

Physiology

Eurythermal and euryhaline

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© Ritger, Rebecca

Source: Nemertea

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