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Clumpy Nudibranch

Asteronotus cespitosus

Photo by Eric Noora
Published on Project Noah
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13.733, 120.887

Field Notes

Description:

"This is a large mound-shaped dorid with a distinctive sculpted appearance. The notum is smooth with large raised ridges and tubercles. There is usually a mid-dorsal longitudinal ridge flanked by compound tubercles that are often rough "mirror images" on either side. The tubercles become smaller marginally. The margin is thin and translucent, sometimes edged in pink. The color varies from light yellow to caramel to grayish tan with the tubercles and rhinophores a light cream or pale yellow. Its gills appear to change from light tan during the day to chocolate brown or blood red at night. "
"The name means "forming dense clumps," in reference to the large groups of tubercles on the notum. It is referred to as the "clumpy nudibranch" in Hoover, 1998 & 2006."
Source: http://seaslugsofhawaii.com/species/Asteronotus-cespitosus-a.html

Habitat:

Protected to highly exposed rocky areas, Indo-Pacific

Notes:

A very large nudibranch - about the size of large dinner plate. About 25 cm. Large rosette-like gills (pic 3 close-up). Night dive at a depth of about 6 m. Halo Anilao Dive Resort house reef, Batangas, Philippines

Species ID Suggestions

Comments (8)

Gracias Gerardo! My first time to see such huge nudibranch. Size of a dinner plate. Actually saw a related species but all red in another dive site last feb. will post those pics soon :-)
Extraordinary spot and series Eric! I never seen this one before is incredible 25 cm wow :)
Amazing series. Very beautiful.

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