Belgian Exclusive Economic Zone, European waters (ERMS scope), Gulf of Mexico, Plymouth, Portuguese Exclusive Economic Zone, Spanish Exclusive Economic Zone, United Kingdom Exclusive Economic Zone

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.

B. delineatus is distributed throughout the Indian River Lagoon

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.

Up to 8 cm in length

(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.

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.

Depth range based on 2 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 47 - 47
 
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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.

annelid worms

Baseodiscus delineatus is considered to be abundant.

Gonochoristic with external outcross fertilization. Planktonic pilidium larvae

Baseodiscus delineatus is gonochoristic with external outcross fertilization.

Egg and the pilidium larva of Baseodiscus delineatus are planktonic.

Eurythermal and euryhaline