Pentapora · Bryozoans (Moss Animals)

Ross Coral

Pentapora fascialis

0-40m

Depth Range

Variable

Max Size

Mediterranean

Distribution

Bryozoan

Identification & Biology

IdentificationA large, heavy bryozoan colony forming rounded, lobed or cabbage-like masses. Orange to salmon-pink, with a rough, porous surface composed of thousands of tiny zooid chambers. One of the largest bryozoan species in European waters.
SizeColony diameter up to 30 cm. Lobes can be 10 to 15 cm across.
Social HabitColonial. Forms large, conspicuous growths on rocky reefs. Long-lived and slow-growing.
HabitatRocky reefs, walls, and areas of hard substrate with moderate water flow.
Depth5 to 100 m. Common between 10 and 50 m.
Feeds OnPlankton, bacteria, and suspended organic particles filtered from the water by the zooid lophophores.
DistributionEastern Atlantic from the British Isles to the Mediterranean Sea. Present in Maltese waters.
DescriptionPentapora fascialis is one of the largest and most conspicuous bryozoans in the Mediterranean. Its pink to orange, cabbage-like colonies can reach impressive sizes and are often mistaken for sponges or soft corals. The colony is hard and brittle, composed of calcium carbonate, and provides important structural habitat for many small invertebrates living in and on its surface.

Range

Habitat & Distribution

Found across the Mediterranean, inhabiting reef & open environments. Active from the surface down to 40m depth.

Where Malta divers have spotted this species

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Sightings are logged by divers using our What Did You See? dive-log tool. View the full live sightings map.

Detail

Preferred Environment

Reef & Open habitats, typically at depths of 0-40m. Most commonly encountered by divers at the shallower end of its range.

Encounter Tips

Best approached slowly and calmly. Avoid casting shadows directly over the animal. Neutral buoyancy and patience increase encounter success significantly.

Biology

Behaviour & Diet

Feeding Strategy

A colonial bryozoan that forms robust, foliose plates or rosettes. Each zooid extends a lophophore to filter phytoplankton and bacteria from the water, creating collective feeding currents across the colony.

Filter feeder

Reproduction

Broods larvae in ovicells on the colony surface before releasing short-lived larvae that settle nearby. Colony expansion occurs through continuous asexual budding at the growing edge.

Brooding

Behaviour & Defence

The heavily calcified colony is rigid and unpalatable to most predators. Rosette-shaped growth reduces drag, and avicularia (snapping zooids) defend the colony surface against fouling organisms.

Calcified skeleton

Dive with diveshack

Where to Encounter in Malta

The following dive sites offer strong habitat match for Pentapora fascialis. All are accessible on a guided dive with diveshack.

5-30m

North Malta

Cirkewwa

Rocky reef with caves, arches and ledges hosting a rich diversity of reef species.

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5-50m

Gozo

Blue Hole

One of the Med's most famous reef dive sites. Rocky walls and archways covered in life.

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18-36m

South Malta

Um El Faroud

The wreck lies on a sandy bottom surrounded by rocky reef -- a diverse habitat attracting reef species.

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IUCN Red List Least Concern

Conservation Status

This species is assessed as Least Concern on the IUCN Red List. Mediterranean populations face ongoing pressure from fishing activity, habitat degradation, and climate-driven changes to prey availability.

Source: iNaturalist Guide #888
by Lesley Clements (CC BY-SA)
diveshack Mediterranean Marine Life guide