Pseudobornella? from Okinawa

September 11, 2001
From: Bob Bolland


Hi Bill,
Looking at a recent post to the Forum asking about Bornella japonica, I was reminded to take a look at some of my Okinawan dendronotoid material; in doing so I came across two animals which I'd almost forgotten about from quite a few years back which I tentatively labelled 'Unknown dendronotoid (Bornella? Dendronotus?). Here is an image of each of the two different animals. Available data is as follows:

RFB #1670 / TL: unrecorded (ca. 30mm) / 225ft(69m) / Horseshoe Cliffs, Okinawa / 26 Apr. 1986
RFB #3183-A / TL: 17mm / 200ft(61m) / Horseshoe Cliffs, Okinawa / 17 May 1993

Cheers,
Bob

bollandr@rapid-link.ne.jp

Bolland, R. F., 2001 (Sep 11) Pseudobornella? from Okinawa. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5222

Dear Bob,
It certainly looks like a cross between a Bornella and a Dendronotus. One thing it does remind me of is Pseudobornella orientalis Baba, 1932 which was described from a preserved animal. It has recently been illustrated in colour in Okutani (2000) - Marine Mollusks in Japan. The main external features are relatively elongate processes on the edge of the rhinophoral stalk ncluding a long thin tentacular papilla which can extend about 3 or 4 times the length of the other processes. The dorso-lateral processes (cerata) are long and tapering with a number of short rounded papillae. The animal in your upper photo has similarities to that but its white colour differs from the transparent animal of Pseudobornella orientalis with brown spots and short yellowish cream lines.

As a complete guess I will suggest it is a species of Pseudobornella but it could be a strange Dendronotus.
Best wishes,
Bill Rudman.

Rudman, W.B., 2001 (Sep 11). Comment on Pseudobornella? from Okinawa by Bob Bolland. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/5222

Factsheet

Unidentified - North West Pacific (Japan, China)

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