Nudibranch is the marine gastropods that constitute the order Nudibranchia (subclass Opisthobranch of the class Gastropoda). Nudibranchs are often casually called "sea slug", but many sea slugs belong to several taxonomic groups which are not related to nudibranchs.Nudibranchs possess a radula feeding organ, but they characteristically lack of shell, gills, and mantle cavity typical of other mollusks.
The delicately colored body has bizarre outgrowths, called cerata, which serve a defensive function, discharging nematocysts that the nudibranch has ingested from cnidarian prey. Cerata also function in gas exchange Antenna-like organs (rhinophores) arise from animal's head.
Body black, pustules green and connected into longitudinal lines in some forms; rhinophores and edge of foot bright with orange or red;gills with orange, red or green.
Powder-blue, finely speckled with dark spots, and a black band as border, usually with short gap(s) at front and a short black line betwwen rhinophores; edge of mantle white with yellow submarginal band, white gap between black and yellow band distinct and even; gills and rhinophores yellow to orange.
Body black with yellow to orange lines or instead of lines, numerous dashes forming lines, white to bluish, long gills and rhinophores.
Bluish grey with three broad black stripes; tubercles from mostly grey when small to many with yellow tops when large; rhinophroes yellow.
Very long and slender with cerata in fan-like clusters, colour from white (juvenile) to brown, orange and iridescent blue, depending on food source and accumulated zooxanthellae.
White with irregular dark blotches, usually circular, formes by black tubercles group together, foot with black spot along its margin, rhinophores with tops and gills with black on branches.
Mantle large, covering most of its foot;creamish white to pale-pinkish brown with distinctive wavy black-line on upper encircling gills and rhinophores, the inside area slight darker and line offset by white on the outside; gills and rhinophores similar in colour to inside area of upper part.
Translucent yellowish white with numerous small brown or white spots and brown blotching, varying to black blotches and white lines around edge of mantle; gills and rhinophores mostly dark brown.
White with dark-brown to black blotches, mantle with broad orange to orange-red edge; gills and rhinophores coloured like the mantle edge.
Creamy white to deep pink and a thin, distinct white margin on mantle; gills and rhinophores pale yellow to orange.
Variable from brown to yellow, usually with large broad, lump-like tubercles, often a row or continuous rise over midline of dorsum; gills large, usually reddish; rhinophores as body colour; mantle margin thin and often broadly yellow.
Headshield slug with rounded head, 2 long tail like appendages. Colour is grey-brown, fading at sides, with a fine white punctuation and yellow tips.
Aegires serenae / Also known as Notodoris serenae
Mostly pale bluish grey (rarely yellow) with series of small black pustula many surrounded by a pale ring, and a bright yellow margin on foot; rhinophores bright yellow; gills yellow and black branches, protected by a three very large extrabranchial processes, latter as body colour with pattern of black vein-like lines.
Pale blue with black blue-edge stripes and spots, usually a short stripe with spot in front between rhinophores; mantle with white margin; gills and rhinophores peppered with small white sports.
The article is main to supporting diving community as educating materials to learn and understand fantastic mircolife of aquatic underwater for nudibranchs of malaysia dive sites.
Reference: http://www.nudipixel.net/photo/
http://www.dmpm.nre.gov.my
http://www.symbiosis.nre.gov.my/
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