Lobate Sponge, Suberites aurantiacus

Lobate Sponge, Suberites aurantiacus. Underwater photographs taken in Bahía de La Ventana, La Paz, Baja California Sur, December 2025. Photograph courtesy of Aaron Woodrow, Juneau, Alaska. Identifications courtesy of Greg Timms, youtube.com/@CoralmasterdivesPuerto-Vallarta/videos.

Phylogeny: The Lobate Sponge, Suberites aurantiacus (Duchassaing & Michelotti, 1864), is a member of the Suberitidae Family of Dermosponges. The Suberites Genus is one of ten genera in the Suberitidae Family, and there are eighty-eight species in the Suberites Genus. They are also known as the Orange Sea Sponge and Mexico as Esponja Marina Naranja.

Morphology: The Lobate Sponge is a polymorphic sessile species with an encrusting massive growth form or a subspherical shape that has large lobate or digitate projections. They have a smooth firm, slightly compressible surface but rugose in some areas with oscules scattered on the surface. They are dense, flexible and rubbery. Their choanosomal skeleton consists of densely packed confused spicules. The spicules are straight sharply pointed tylostyles. Their ectosomal skeleton is a palisade-like continuum of bouquets of smaller tylostyles. The tylostyles vary widely in size and slightly protrude outside the surface and may be deformed, smooth or wrinkled, which is related to their native habitats. They have visible channels close to the surface. They are normally orange, red, or green color with bluish and red tones, however they can also be yellow, dark green, greenish purple or turquoise. Their interior is a uniform yellow-ochre. These sponges reach a maximum of 12 cm (4.7 inches) in height and are normally about twice as long and they are wide. The growth and distribution are affected by abiotic factors including temperature, salinity and hydrodynamic conditions.

Habitat and Distribution: The Lobate Sponge is a solitary benthic species that are found in marine and brackish mangrove environments, to which they attach themselves, at depths up to 50 m (165 feet). The growth and distribution are affected by abiotic factors including temperature, salinity and hydrodynamic conditions. The Lobate Sponge has a wide global distribution and if found in all Mexican oceanic waters of both the Atlantic and Pacific Oceans with the exception that they are absent from along the west coast of the Baja Peninsula.

Diet: The Lobate Sponge is a suspension feeder that filters organic particles and planktons from the surrounding sea water.

Predators:  The Lobate Sponge has no known predators.

Reproduction: The Lobate Sponge are simultaneous hermaphrodites (having both male and female sex organs) with seasonal reproductive cycles. Reproduction is sexual and is done via spermcast spawning. Spermcast spawning involves releasing sperm into water, while retaining the eggs. The eggs are then fertilized internally. The embryos develop in brood chambers until they reach a certain size, then disperse as planktonic parenchymella (free-swimming) larvae before they settle out to the bottom.

Ecosystem Interactions: Ecosystem interactions specifically for the Lobate Sponge have not been well documented. They are known to coexist with other sessile invertebrates, increasing the biodiversity of the benthic systems which includes areas with high hydrothermal activities. Other sponges of the Suberites Genus are known to provide shelter for fish, amphipods, decapods, isopods, and other small invertebrate life.

Human Interactions:  From a conservation perspective the Lobate Sponge has not been formally evaluated. They have a wide global distribution and are common and should be considered to be of Least Concern. The Lobate Sponge has been shown to be a potential source of antibacterial compounds.

Synonyms: Laxosuberites aurantiacus, Laxosuberites zeteki de Laubenfels, Suberites aurantiaca, Suberites zeteki, Terpios aurantiaca, and Terpios zeteki