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NudiNotes

NudiNotes

Sometimes a short article on a topic can be informative and also easily remembered because it is focused and the information is not buried in lots of unrelated data.

This is the premise of NudiNotes – short interesting articles on specific sea slug related topics.

As this section is populated the accumulated NudiNotes will be placed under subject related headings.

HANCOCK’S ORGANS – THE “RHINOPHORES” YOU HAVE WHEN YOU DON’T HAVE RHINOPHORES

We all know about the rhinophores of the true nudibranchs - those highly developed chemical-detecting “antennae” located anteriorly on their “head”. Even sea slugs other than the true nudibranchs such as the sea hares, and the side-gilled pleurobranchs have...

“WELL, THERE’S SOMETHING YOU DON’T SEE EVERY DAY.” – Tenellia sibogae

Tenellia sibogae (or Trinchesia sibogae, depending on whose taxonomy you follow) is usually sighted upon its food - arborescent hydroids of the Sertularella genus (usually identified as Sertularella diaphanous or Sertularella quadridens). If you are searching for sea...

SIX SEPARATE SOCKETS – Hexabranchus

Hexabranchus sanguineus The name says it all. It has six gills - Hexabranchus, and is blood-coloured - sanguineus. This species was originally described from the Red Sea. Specimens from that region are not red and white mottled as in the images posted here but are a...

UNIQUELY UNITED BUT DECEPTIVE DISPLAY – THE SUCTORIAL FEEDING POROSTOMATA NUDIBRANCHS

UNIQUELY UNITED BUT DECEPTIVE DISPLAY The Suctorial Feeding Porostomata Nudibranchs In a previous NudiNote - The Little Scraper - the radula of sea slugs was discussed. Mention was also made of those sea slugs that do not possess a radula. Among the dorid nudibranchs...

AUTOTOMY – THE SELF SACRIFICE DEFENCE

Autotomy - the Self Sacrifice Defence   The ability to cast off a particular section of their anatomy, in order to facilitate escape from a predator, is possessed by a wide range of animals. Although the phenomenon, even in the Mollusca, had been recognized...

VIVA VARIATION – Hypselodoris bullockii & LOOK-ALIKES

VIVA VARIATION Change is upsetting    Repetition is tedious.       Three cheers for variation! Mason Cooley Across all of the Sea Slugs there is an almost endless amount of variation. Different shapes, sizes, textures, patterns and colours. We aficionados of the Sea...

THE LITTLE SCRAPER – THE RADULA

The Little Scraper Nearly all the sea slugs, just like nearly all the molluscs (except the bivalves), possess a radula in the buccal cavity for feeding. The radula is used not unlike a combination of teeth and tongue to rasp at, puncture, slash or grip the prey for...

SORTING OUT THE TRUE NUDIBRANCHS

Sorting out the True Nudibranchs   The Nudibranchs are but one order, the Nudibranchia, in the informal group that we refer to under the umbrella of Sea Slugs although common and popular usage has seen the term Nudibranchs used incorrectly to refer to all the sea...

THE EXCEPTION TO THE RULE – Phyllodesmium acanthorhinum

THE EXCEPTION TO “THE RULE” Phyllodesmium acanthorhinum is a rarely sighted, though widely distributed, species first recorded from Okinawa by Bob Bolland in 1987. The 15 mm long specimen pictured here was found in the Mooloolah River, southern Queensland, Australia...

CONGRESS ON CODIUM – Elysia maoria

CONGRESS ON CODIUM All of the sea slugs in the Sacoglossa order are herbivorous, well nearly all, a very few prey on the eggs of other sea slugs. However, that great majority that feed on plants do so by puncturing the cell walls of algae and sucking out the contents....