Depth
Axinella · Sponges

Common Antlers Sponge

Axinella polypoides

0-40m
Depth Range
Variable
Max Size
Mediterranean
Distribution
0-40m
Depth Range
Variable
Max Size
Reef & Open
Habitat
Carnivore
Diet
Solitary
Social
LC
IUCN Status
Kingdom Animalia
Phylum Porifera
Genus Axinella
Species polypoides

Sponge

Identification & Biology

  • IdentificationA striking, upright sponge with thick, branching lobes resembling antlers or candelabra. Bright orange to yellow-orange. The surface is smooth with scattered small pores and occasional larger oscula (water outlets).
  • SizeColony height up to 50 cm. Individual branches up to 5 cm in diameter.
  • Social HabitSessile. Grows on rocky walls and overhangs, often in areas with good current. Long-lived and slow-growing.
  • HabitatRocky walls, overhangs, and cave entrances with moderate to strong water flow.
  • Depth15 to 200 m. Most commonly encountered between 20 and 60 m.
  • Feeds OnBacteria, microalgae, and dissolved organic matter filtered from the water.
  • DistributionMediterranean Sea and adjacent eastern Atlantic. Present in Maltese waters on deeper reefs.
  • DescriptionAxinella polypoides is one of the most impressive sponges in the Mediterranean, its bright orange, antler-like branches a highlight of deeper rocky walls. It is very slow-growing and large specimens may be decades old. The species is sensitive to sedimentation and physical damage, making it vulnerable to bottom trawling and careless diving. A healthy population is a sign of good water quality and minimal disturbance.

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.

Common Antlers Sponge species card

Biology

Behaviour & Diet

Feeding Strategy

Draws water through a network of internal canals lined with choanocyte cells, filtering bacteria and ultra-fine organic particles. Its tall, branching shape positions it in current to maximise water flow across its surface.

Filter feeder

Reproduction

Reproduces sexually by releasing sperm into the water column, which neighbouring sponges capture internally to fertilise eggs. Brooded larvae are released and settle on hard substrate within days.

Brooding

Behaviour & Defence

Contains a suite of bioactive alkaloids and terpenoids that make it unpalatable to most fish and nudibranchs. Its firm, fibrous skeleton also resists casual grazing.

Chemical defence

Dive with diveshack

Where to Encounter in Malta

The following dive sites offer strong habitat match for Axinella polypoides. 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.

View dive site ›
5-50m
Gozo

Blue Hole

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

View dive site ›
18-36m
South Malta

Um El Faroud

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

View dive site ›
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