Physical Description

Diagnostic Description

Description

Up to 7 cm long (W Indian Ocean specimens). A distinctive species with obvious, enlarged dorsal protuberances on the mantle which contain a concentration of defensive glands. These are prominent to lure predators away from the vital gills and rhinophores, and are a distinguishing feature of the genus. Colour pinky orange with yellow spots, occassionally olive-green, always with violet margins. Habitat: diverse, among shallow coral reefs. Distribution: W Indian Ocean, Red Sea to W Pacific Ocean. In the region C. tenue often coexists with C. trilobatum (Richmond, 1997). Distribution: also known from South-East Asia and tropical Australia (Rudman, 1988).
  • Rudman W.B. (1988). The Chromodorididae (Ophistobranchia: Mollusca) of the Indo-West Pacific: the genus Ceratosoma J.E. Gray. Zoological Journal of the Linnean Society 93 (1): 133-185.
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Source: World Register of Marine Species

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Ecology

Habitat

Depth range based on 41 specimens in 1 taxon.
Water temperature and chemistry ranges based on 13 samples.

Environmental ranges
  Depth range (m): 13.9 - 74.3
  Temperature range (°C): 23.278 - 26.525
  Nitrate (umol/L): 0.149 - 2.380
  Salinity (PPS): 35.095 - 35.493
  Oxygen (ml/l): 4.230 - 4.666
  Phosphate (umol/l): 0.104 - 0.308
  Silicate (umol/l): 0.498 - 1.453

Graphical representation

Depth range (m): 13.9 - 74.3

Temperature range (°C): 23.278 - 26.525

Nitrate (umol/L): 0.149 - 2.380

Salinity (PPS): 35.095 - 35.493

Oxygen (ml/l): 4.230 - 4.666

Phosphate (umol/l): 0.104 - 0.308

Silicate (umol/l): 0.498 - 1.453
 
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Wikipedia

Ceratosoma tenue

Ceratosoma tenue is a species of colorful dorid nudibranch, a sea slug, a shell-less marine gastropod mollusk in the family Chromodorididae.

Distribution[edit]

This sea slug is widespread throughout the tropical waters of the Indo-Pacific area, from the oriental african coast to Hawaii.[1]

Description[edit]

Ceratosoma tenue can grow to a maximal size of 12 cm length.[2] The body coloration is extremely variable but is always composed of bright colors. However, the body coloration is not a valuable criterion of determination for this species because it can easily be confused with Ceratosoma tribolatum. The physical distinctive criteria are three mantle lobes on the first half of the body on each side and the purple margin of the mantle and foot is a dotted line. Another specificity of the species is the kind of "horn" covering the gills, which is like a lure and acts as a defensive chemical weapon that will scared any potential predator who dares to bite this part.[3] The gills and the rhinophores are retractile in internal sheaths.

Behavior[edit]

Ceratosoma tenue is active all time and has a diurnal activity.[4]

Feeding[edit]

Ceratosoma tenue feeds on sponge of genus Dysidea.[5]

References[edit]

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