Authority Chemnitz, 1781 in Dautzenberg, 1929 [details]

Potato-shaped, 2-10 cm long and wide, free-living or attached basally to rubble; irregularity lumpy, oscules on low ... [details]

Width to 20 cm. Bell hemispherical, slightly pointed with smooth to finely granulated surface. Mouth-arms with ... [details]

Height to 25 cm, width 1/3 to 1/2 of height. Bell thick, translucent, with smooth surface and four long tentacles ... [details]

Up to 3 cm, with very fine axial ribs. Colour tan. Habitat: eulittoral and deeper. Distribution: W Indian Ocean to ... [details]

Shell up to 5 cm diameter. Colour white to yellowish-brown, lighter at the edges and beneath. Operculum horny and ... [details]

Up to 30 cm long. Distinctive, with ridges of large tubercles running down centre of body, and a series of ... [details]

Width 15-30 cm. Bell flat to domed, firm, translucent, with four (or 5-7) bluish-pink gonad rings, four mouth-arms ... [details]

Erect expanded leaves up to 10 mm thick, 40 cm high. Short woody stalk with fleshy, blade-like lobes. Surface ... [details]

Soft oval body, up to 7cm long, which has a trapezoidal flap at the front and is translucent orange or yellow. ... [details]

Multi thin-walled, fragile tubes, 1-2 cm across and 1-3 cm high, appearing as a thin stretched skin embedded with ... [details]

A broad, plump sea slug, up to 7cm, varying in colour from tan to brown or orange. Body is covered in simple and/or ... [details]

Thick shell, up to 4 cm, with tall spire and large body whorl, upper whorls separated by deep sutures, and the ... [details]

Distinctive, think shell, up to 4 cm, with numerous spiralled, brown cords on lighter background. Aperture toothed ... [details]

Whorled or curved plate-like sponge, 15-20 cm wide and high, which can form a cup with internal spirals at ... [details]

Width to 12 cm. Disc flat, with eight short mouth-arms each with four (or six) side-branches supporting many ... [details]

mouth-arms with 6-8 short, spreading main branches; clubs minute, to 0.8 mm; no peripheral spots (Richmond, 1997). [details]

Width to 35 cm. Bell sub-hemispherical, firm to floppy, finely granular and translucent. Mouth-arms neatly conical ... [details]

with bell bearing rows of prominent papillae radiating outwards. Sting harmless (Richmond, 1997). [details]

probably conspecific <282>. [details]

Width to 40 cm. Pink to lilac above, brown below, with a central dome covered in 10-50 large, irregular ... [details]

Habitat: Mangrove Forests. Thick, strong, elongate shells up to 3 cm, with five whorls and about 20 axial ribs. ... [details]

Evenly sub-circular shell, up to 2 cm, with undulating surface and a distinctive internal cup-shaped projection. ... [details]

Width to 14 cm, 10 cm high. Bell surface covered with stinging warts. Up to nine tentacles on each corner, on ... [details]

Species up to 4 cm long, with central region orange brown, mottled with lighter and darker patches and dark purple ... [details]

Width to 25 cm. Bell surface with fine warts. Four separate mouth-arms, up to 50 cm long, with frilled edges. Bell ... [details]

Spherical, 2-5 cm diameter. Surface is hairy, silty, and with sunken pits; stiff velvet to touch. Interior orange ... [details]

Multiple stubby fan-like branches, 3-4 cm wide, 5-10 cm long, loosely attached to substrate. Surface tuberculate, ... [details]

Delicate tubular mass, 2-5 cm wide. Tubes 0.5 mm diameter with membraneous raised oscules. Crisp, compressible, ... [details]

Width to 20 cm. Bell slightly pointed, robust and smooth, edged with a skirt furrowed between the fused lappets. ... [details]

Width to 50 cm. Distinctive, large, flat-topped bell, with eight large marginal lobes. Colour typically cream to ... [details]

Diameter up to 3mm, length variable. Similar to Vermetus sp. But much smaller. Flat, brown-red operculum with ... [details]

White, curved, tapering tube with 12 ridges along entire length, up to 5 cm long. Habitat: shallow and deep sand. ... [details]

Up to 5 mm, smooth, thin and glossy. Pale cream with bands of brown dashes. Habitat: among seaweed in shallow ... [details]

Oval and very flattened, up to 15 cm long. Well camouflaged by colouration of mottled creams, beiges, browns, ... [details]

Solid shell, up to 3 cm, with strong, low-spined varices. Colour variable, often brown or mottled, with pale ... [details]

Habitat: rocky shores. Tropical Indo-Pacific, also in Australia in Kalk (1958). [details]

Erect mass, 5 cm high and wide. Highly conulose surface with visible, protruding, tiny black, twig-like fibres up ... [details]

Up to 3 cm long. Distinguished from the two genera (Phyllidia arabica and Phyllidiella zeylanica) by a ventral anus ... [details]

Description: Patches 4-5 cm wide, 5-10 mm thick with punctured surface and slightly raised oscules, 2-3 mm ... [details]

Often a darker red than G. townsendi (Richmond, 1997) [details]

A distinctive, truly pelagic silvery blue mollusc, up to 6 cm long, with three pairs of arms. Floats upside-down ... [details]

Up to 5 cm long. Western Indian Ocean specimens tend to be olive-green, although geographical colour variations ... [details]

Larger, up to 7 cm, dark reddish-brown with white speckles, a broad, yellow band at mantle edge becoming ... [details]

Small single or double tubes or mounds, 0.5-3 cm high, 1 cm wide, scattered in groups on substrate. Oscules apical ... [details]

Club-shaped lobe growing erect from substrate, up to 10 cm wide and high, with rounded apex. Surface covered in ... [details]

Encrusting sponge, irregularly lobate, 5-10 cm long, 5 cm thick. Surface raised into faintly conulose irregular ... [details]

Single or multiple clumps of tubes up to 50 cm high and 4-5 cm wide. Walls 3-4 mm thick, sometimes ribbed, ... [details]

Amorphous and flimsy sponge forming clumps 5-15 cm across and 1-3 cm high, appearing as a thin stretched skin ... [details]

Tiny, to 2 cm. Bell straight-sided, flat-topped, with 16 vertical ridges and eight minute tentacles. Colour ... [details]

reddish-brown, to 15 cm width, with fine, polygonal warts on surface. In adults, pale patches on edge to bell with ... [details]

Width to 10 cm. Conspicuous. Eight thick mouth-arms with long terminal clubs, which may detach. Bell transparent ... [details]

Up to 12 cm long. Variable shades of brown with brown and white blotches, squared cerata, and covered in papillae, ... [details]

Up to 3 cm, similar to N. albescens gemmuliferus, but with more widely spaced, spiny nodules arranged in spiral ... [details]

Small, smooth, rounded shells, up to 3 cm long, with a wide aperture. Characteristic axial zigzag markings on a ... [details]

Similar to Cinachyrella voeltzkowii, but larger, bright orange-yellow, subtidal (Richmond, 1997). [details]

Width to 5 cm. Bell rounded, with low surface warts, four mouth-arms and eight marginal tentacles, both long. ... [details]

Habitat: open seas, but East African records are usually based on stranded individuals, often after storms. ... [details]

Small rounded bush up to 10 cm high, 8 cm wide. Oblong in outline, or with several lobes, attached to substrate by ... [details]

Narrow, tubular shells, up to 6 cm, tapering at both ends. Habitat: usually on Gorgonians in deep water. ... [details]

Up to 4cm long. Occurs in a bewildering variety of colours, from light brown with creamy yellow or orange markings ... [details]

Solid, rubbery, tuberculate body, up to 10 cm long. Ground colour black, white tubercles with bright orange tips ... [details]

Body is broad, truncate, and rather flattened, up to 4 cm long. Ground colour is usually pale green, beige, or ... [details]

Description: Thinly encrusting sponge, 5-10 cm wide, 5 mm thick. Surface composed of rough armoured polygonal ... [details]

Up to 8 cm long. This frequently encountered species is very cryptic. The body is flat, mottled white and brown, ... [details]

Up to 10 cm long. Animals may vary in colour from brown or red to orange. Dorsal pattern of dark and light polygons ... [details]

Unmistakable large, elongated, solid and heavy shell, up to 20 cm. Shoulders of body and upper whorls with thick, ... [details]

Habitat: muddy shore (Ruwa, 1984 <109>). Pure white shells, rather elongated in shape, up to 4 cm; chestnut-brown, ... [details]

Circular polypoid disc of chitinous material, to 3 cm. Numerous tentacle-like dactylozoids beneath and around disc; ... [details]

Description: Irregularly encrusting, 10-12 cm long and wide. Surface smooth to faintly domed and undulating. ... [details]

Sprawling, branching sponge with fingers 10-15 cm long, 1-3 cm wide, although highly variable in size. Arises from ... [details]

Encrusting patch. Surface with wrinkles 2-3 mm wide; fleshy, smooth and velvety. Colour fawn. Habitat: shaded ... [details]

Up to 7 cm . One of the most common aeolids found, this species has many clusters of cerata on each side. Body ... [details]

Up to 2 cm, description as family. Colour dark brown to black, with white or yellow spots or zigzag lines. ... [details]

Width to 50 cm. Bell hemispherical with smooth surface. Eight mouth-arms with extra mouth-bearing shoulders ... [details]

Small, solid shell, up to 4 cm, with 1-2 varices and 10-15 prominent knobbly, spiral chords on each whorl. Outer ... [details]

Encrusting, 2-5 cm wide, 4-7 mm thick. Surface undulating translucent "skin" over meandering subdermal canals. ... [details]

Flattened shell, up to 3cm, with fine, radiating, pale ridges on a darker background. Circular outline with a ... [details]

Up to 2 cm long, mottled in shades of green with a few flecks of white and brown. Almost invisible, but probably ... [details]

Steep-sided cone, up to 20 cm wide, 12 cm high and surrounded by shorter, rounded projections, or small cones, 1-4 ... [details]

Spreading cushion with lobes, up to 20 cm long, 10 cm wide, 5 cm high. Surface conulose, but looks smooth and shiny ... [details]

Domed clump of folded, single blades 1 mm thick, frequently in tight groups, up to 18 cm high and wide. Oscular ... [details]

Elongasted, translucent, striped body, up to 8 cm long. Often prickly appearance, and with luminicent blue to ... [details]

Multilobed, erect club-shaped sponge, up to 30 cm high and 20 cm wide, often narrower around the base than at ... [details]

Height to 22 cm, width to 13 cm. As C. alata but surface with low, clear warts separated by a translucent lace-work ... [details]

Encrusting, up to 3 cm thick with turrets 3-4 cm high. Surface with long shallow pits; oscules apical and ... [details]

Spherical, up to 2 cm diameter. Surface divided into raised polygonal areas separated by inhalant channels. Tough ... [details]

Spherical sack-like masses, loosely attached to the substrate. Oscules raised, 1-2 cm diameter; surface smooth, ... [details]

A large, solid shell, up to 20 cm, with long spire, small body whorl, and an outer lip with 5-7 blunt teeth. ... [details]

Description: as T. oryza, but lacking dorsal groove. (Richmond, 1997). [details]

Description: as T. virgatus, but paler brown with darker bands and spots. Distribution: occurs in the southern part ... [details]

Resembles Porpita but with triangular sail on upper surface, to 4 cm. Colour blue. Habitat: floating on sea ... [details]

Width to 60 cm. Firm, hemispherical bell with surface grooved irregularly. Mouth-arms flattened laterally, with ... [details]

Description of Western Indian Ocean specimens: Irregular branches, fingers or blades arising from a spreading base. ... [details]

A heavy, solid shell with high spire, up to 5 cm. Body whorl smooth, upper whorls ribbed. Inner margin of lip ... [details]

Recorded by Richmond (1997) from the Western Indian Ocean, but this is a doubtful record. [details]

Found growing on mangrove pneumatophores, especially those of Sonneratia alba (Richmond, 1997). [details]

Year of descrition from Dautzenberg, 1929 [details]

Year of description from Dautzenberg, 1929 [details]

Year of description from Dautzenberg, 1929. Lamarck as author in Kalk (1958). [details]