Nudis and flatworms...

[NorthO]

Hi!

A little help would be greatly appreciated!


I'm guessing some kind of hypselodoris, but which one? (Puerto Galera, Philippines)


Pteraeolidia ianthina? (Puerto Galera, Philippines)


Nembrotha Chamberlaini? I'm hesitating because the base of the rhinophores and gills is dark purple, and it looks blue-ish instead of white... (Verde Island, Philippines)


Some kind of flatworm from Puerto Galera


I was thinking pseudoceros monostichos, but the center line goes all the way to the front and the brown lines on each side have a distinct border... (Palau)


And the last one... Haven't got a clue! Under a centimetre in length. Juvenile? (Moalboal, Cebu, Philippines)

Thanks!!!

 

[MaxBottomtime]

I think the first one is Risbecia apolegma.
My friend Kevin Lee has 19 pages of nudis and flatworms from the Indo Pacific at Indo-Pacific Opisthobranchs - Kevin Lee's Photos

 

[ocdiver1]

last one maybe a juvenile roboastra gracilis? i also think one is def risbecia apolegma and that you've got #2 and #3 right

 

[Kilili]

Well, "clueless" is Roboastra gracilis
apolegma? maybe, but typical dot pattern is not present
ianthina, surely
chamberlaini, probably, need to see red patch beneath gill area, but purple is likely as good [I'm no expert though]
flatworm, I would say Pseudocerus bifurcus, there's a lot of variety
The other marine worm, don't know, but I've photographed many in the Philippines lacking description that I can find anywhere, and I've not seen this one.
The expert is Leslie Newman, you can try contacting...

Also see nudipixel.net, you can try matching against the 200+ apolegma photos.

 

[NorthO]

Thanks guys!

I'll continue looking for the last flatworm...

 

[Kilili]

If you check nudipixel.net, you will find a good match for the first in the category Hypselodoris sp., which are those not categorised by species.
As I mentioned, doesn't really look like apolegma.

A number of Hypselodoris were recently changed to Risbecia, so where those under "sp." really belong is unclear.

 

[NorthO]

And what's the difference between the hypselodoris family and the risbecia?

 

[Kilili]

And what's the difference between the hypselodoris family and the risbecia?

Both genus, Hypselodoris and Risbecia, are in the family Chromodorididae.
As more information is gathered by study, anatomical and genetic, species are often reclassified based on the findings.

For the layman, it's confusing at times, as not all sources get updated in timely fashion and, I suspect, some changes are not accepted by all authorities.
I go with Nudipixel as my primary source, as it's the most consolidated and up to date repository I know. However, some of it's information is suspect as well.

For instance, is it Risbecia tryoni or Hypselodoris tryoni, Chromodoris geometrica, or Goniobranchus geometricus?
Nudipixel says one thing, Wikipedia another. I just go with the flow.

 

[NorthO]

Thanks, very interesting...

Love your quote btw Kilili!