Mimics of Phyllidiella pustulosa
Author: Dr. Bill Rudman
Quoted from Sea Slug Forum: The example I illustrate here are the phyllidiid dorid nudibranchs such as Phyllidiella pustulosa. The phyllidiids exude very noxious and toxic chemicals from their skin and appear to be avoided by most fish. They are often the only sea slugs which blatantly crawl out in the open during the day. Other nudibranchs, flatworms, and even a holothurian are known to mimic phyllidiid nudibranchs.
Nembrotha kubaryana group
Noumea romeri vs. Noumea simplex
Author: Gary Cobb
- Always has a distinct white mantle marginal band
- The mantle is pink
- The gills are always orange-red. Most all of the gills in the circlet are red right down to the gill pocket
- The rhinophoral clavus is most often completely orange-red. But sometimes the lower half of the clavus is white. The stalk is always white
- Never has a white mantle marginal band. It can have an orange band, or orange dashes, or orange spots but there is invariably some orange pigment somewhere on the mantle margin. The tip of the tail is usually orange too
- The mantle colour can be pink or white
- The gill are always white with only the very tips of the anteriormost 3 gills being red
- The rhinophores have a red-tipped clavus. The majority of the clavus and the stalk are always white. The individual rhinophoral lamellae are transparent white
Noumea varians group
Author: Richard Willan
Durvilledoris pusilla always has an opaque mantle. The pattern on the central area of the mantle is always scalloped with 'lobes' or 'tongues' of colour that almost reach the margin; one pair of these lobes is immediately behind the rhinophores and the other pair is in front of the gills. The midline has 2 white circles. The colour pattern on the tail repeats that of the central mantle. Thius is definitely a good species.
Noumea varians can have either an opaque or a semi-transparent mantle. The pattern on the central area is not actually lobed, but it often looks that way in photos because of the way the body is deformed when crawling over irregular terrain. The midline has 3 white streaks or a single continuous narrow stripe. The tail is uniformly purple. There is evey indication that what we presently call Noumea varians may, in fact, cover several different species.