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Bighorn Nembrotha

Bighorn Nembrotha
Photo Information
Copyright: Peter Bergquist (Pedda) Silver Star Critiquer/Gold Note Writer [C: 41 W: 1 N: 247] (1287)
Genre: Animals
Medium: Color
Date Taken: 2005-04-11
Categories: Molluscs
Camera: Nikon D70, Nikkor Micro 60mm
Exposure: f/14.0, 1/500 seconds
Details: (Fill) Flash: Yes
More Photo Info: [view]
Photo Version: Original Version, Workshop
Theme(s): Underwater World, Underwater Wonder World 5 [view contributor(s)]
Date Submitted: 2005-05-12 8:29
Viewed: 6013
Favorites: 1 [view]
Points: 30
[Note Guidelines] Photographer's Note
Bighorn Nembrotha (Nembrotha megalocera).

This nudibranch is endemic to the Red Sea and it grows up to 7, 5 cm long. It’s fairly common and one of few that actually can “swim” like a fish by lateral flexing of the body when disturbed. The one on the picture is around 5 cm long.

The picture is taken on 20 meters depth on one of Deep South’s house reefs. When I found the nudibranch it was crawling on the coral but after a while it raised a big part of the body and “stood” up sniffing around. This apparently is its way to locate and find its way around the reefs. Since the region around the mouth, and its oral tentacles, are brimming with nerve endings, this is how it learns about its close environment. Without sight, it can only find out how big an obstacle in its path is by feeling around with its mouth and oral tentacles. The obstacle in this case was probably a big camera with an even bigger diver behind it. ;-)

Nudibranchia ≈ Naked gills. In most species the gills and rhinophores are shown on the outside of the body. All are slow moving predators. Lacking a shell, they are more agile than other slugs but still most of them creep around displaying often a very colourful and beautiful body.

The word RHINOPHORE is made from two classical Greek words rhino = nose, and phore = carrier, and is a reference to the function of the rhinophores as an organ of "smell". We smell scents and odors with our nose, which has special receptors to sense the chemical molecules in the air. In nudibranchs, and other marine animals, the same sorts of chemicals are dissolved in the sea water. In many Sea Slugs this is how they find their food.

I’ve cropped and resized the picture. After that USM is applied. All is done in Photoshop CS.

LordPotty, TAZ, ellis49, Fisher, Signal-Womb, Robbrown, marhowie, hummingbird24, gerhardt has marked this note useful
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ThreadThread Starter Messages Updated
To Okan: Late answerPedda 1 05-23 04:12
To ellis49: NakensnäckaPedda 2 05-14 10:01
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Critiques [Translate]

Colourful and detailed, what more could you ask for...

These nudibranch have to be the most amazing looking creatures on earth.Who needs hallucinogenics when you hang out in a psychedelic community like this?

I want to take photos in undersea :(
beautiful colours, very good photo.
I guess it is a sea rabbit (its Turkish name :))

Vad det här för något, Peter, det är mycket vackert.
It's very beautiful, great details, very good DOF and well composed.
Great work.

  • Great 
  • urban Gold Star Critiquer/Gold Note Writer [C: 71 W: 4 N: 79] (413)
  • [2005-05-12 12:55]

These nudibranches are beautiful and this one is captured very nicely. Good work :-)

  • Great 
  • twin Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 244 W: 17 N: 494] (3259)
  • [2005-05-12 15:27]

you manage it perfectly... really you have great ability to do it deep under water... congratulations... TFS your beautiful photos...

So beautiful and so unusual, very good work.

Oh superb Peter, the colours and clarity of this image are just amazing, saw it earlier and just had to come back to lookagain and leave you a comment. an outstanding shot from a difficult place to work, looks so clear that it could of been done in a studio, TFS this wonderfull shot.


The colors and the photo are wonderfull.

Spectacular image and presentation. great diagonal composition and clarity of image. Really great job.

Wonderful captured Peter, colours and the composition are great! I prepeared a workshop for you if you don't mind. TFS.

  • Great 
  • TAZ Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 2241 W: 47 N: 3167] (10926)
  • [2005-05-13 3:39]

Très belle et intéressante composition aquatique bien réalisée pour ce superbe Bighorn. Il a de jolies couleurs et une forme étonnante.
Wonderful & Well Done !

Fantastic looking "Bighorn" Peter! Exceptional colors, details and DOF. A great note and addition to the underwater theme, Very well done!

  • Great 
  • Fisher Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1540 W: 309 N: 2234] (8915)
  • [2005-05-13 13:04]

Excelent shot, colorful, crisp and detailed.
A beautiful composition.


What a pose! Peter these nudi's are lovely and always seems photogenic. I really enjoy your photos of the underwtaer realm. Very well done.

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