Phyllidiopsis shireenae
From Wikipedia, the free encyclopedia
| Phyllidiopsis shireenae | |
|---|---|
 | |
| Phyllidiopsis shireenae | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Order: | Nudibranchia |
| Family: | Phyllidiidae |
| Genus: | Phyllidiopsis |
| Species: | P. shireenae |
| Binomial name | |
| Phyllidiopsis shireenae Brunckhorst, 1990 | |
Phyllidiopsis shireenae is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae of the order Doridida.[1][2][3] Its common names are Shireen’s Phyllidiopsis, Shireen’s Phyllidiopsis Sea Slug, Shirin Sea Slug, and Crested Wart Slug.[4]
It was first described by Brunckhorst in 1990 from specimens collected in the tropical western Pacific.[2] Like other members of the Phyllidiidae family, it is characterized by its firm, flattened body with raised dorsal tubercles, a lack of dorsal gills, an absent radula associated with sponge-feeding behavior, and brightly colored bodies.[3][5] The species can be distinguished from related taxa by its dorsal morphology and salmon pink rhinophore coloration.[2][3][6] P. shireenae is distributed across the Indo-Pacific region and is typically associated with coral reef habitats.[3][6][7]
Phyllidiopsis shireenae was formally described by Brunckhorst (1990) as a part of a revision of the genus Phyllidiopsis,[3] a group of dorid nudibranchs characterized by their dorsal tubercles and reduced internal anatomy.[2][5] The species belongs to the phylum Mollusca and class Gastropoda, within the order Doridida, part of the superorder Nudipleura, and the family Phyllidiidae.[4] Members of this family are sponge-feeding nudibranchs that lack a radula and dorsal gills and instead use a specialized suctorial feeding apparatus.[3][2]
Recent taxonomic studies have confirmed the placement of P. shireenae within the genus Phyllidiopsis and identified which traits distinguish them from closely related species, including their mid-dorsal crest and rhinophore coloration.[3][2] Scientists have further confirmed the placement and history of P. shireenae through molecular phylogeny studies[8][9] and through examining their chemical ecology.[3][10] P. shireenae has been differentiated from other species both morphologically and phylogenetically.[8][9][2]
Description
Phyllidiopsis shireenae exhibits the characteristic morphology of phyllidiid nudibranchs, with a firm, elongate body.[3][2] It is covered in rounded, angular tubercles on its dorsal surface, giving them the nickname Wart nudibranchs.[2] Their overall coloration can be pale pink, white, or grey.[2] They have dark colored markings and a bluish undertone.[2][5] The dark colored markings are usually black lines that run longitudinally along their bodies.[2] Their coloration and patterns can be used as a defense mechanism called aposematic signaling which warns predators of toxicity.[5]
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P. shireenae has chemosensory organs including rhinophores and lamellate structures.[2] Rhinophores are the sensory organs located on a nudibranch’s head.[3][2] P. shireenae is distinguished from other species by the salmon-pink color of their rhinophores.[2] Their lamellate structures help them to detect food and mates, and to sense chemicals in their environment.[3][2] P. shireenae has a thick body and mantle and their ventral surface is adapted to support them crawling along reef substrates.[3][2] Phyllidiopsis shireenae is characterized by their high mid-dorsal crest.[2]
Like other members of Phyllidiidae, P. shireenae are specialized sponge-feeders which is why they lack a radula.[3][2] Instead, they feed on sponges using external digestion and suction with a specialized feeding apparatus and muscular pharynx.[3][2] They also lack dorsal gills.[3][2] Phyllidiidae are distinct from other dorid nudibranchs because they have secondary gill leaflets under the mantle.[2][3]
Distribution and habitat
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Phyllidiopsis shireenae is found in tropical regions in the Indo-Pacific.[2] There have been documented sightings in Indonesia, the Philippines, India, and East Africa.[6][7][3] Specifically, the species lives in coral reef ecosystems in tropical marine regions.[6] They have been recorded on reef substrates including sponges and bryozoans.[10][3]
P. shireenae has a varying depth range and can be found in shallow waters and subtidal zones as well as in moderately deep depths.[6][5][3] It is thought that their depth is dependent on environmental conditions and prey availability.[5] Phyllidiids are often found on or near sponges.[3][6]
Ecology
Phyllidiopsis shireenae are spongivorous and have a specialized feeding method.[3][2] They feed on sponges, consistent with all Phyllidiids.[3] P. shireenae has a modified foregut and uses external digestion and suction to feed.[2] They release digestive fluids to soften the sponge and then suck the softened tissue which is pumped into their muscular pharynx.[2] This specialized feeding strategy contributes to nutrient cycling and benefits coral reef ecosystems.[5]
P. shireenae is considered to be an indicator of marine biodiversity in Indonesia and other regions.[6][11] High species diversity is crucial to ecotourism and ecological stability.[11][7] The species can be indicators of coral reef ecosystem health because of their sensitivity to changes in environmental conditions like pollution, temperature, and disturbances.[7][11]
Chemical ecology
Phyllidiopsis shireenae protect themselves by utilizing chemical defenses and bright coloration as deterrents.[10][3][5] Bioactive compounds can be produced from symbiotic microorganisms in sponges which P. shireenae and other species in the group can accumulate.[10][12][3] When P. shireenae and other members of Phyllidiidae feed on noxious sponges, they take in chemicals from them and store these compounds in their tissues.[10][3] They can modify these chemical compounds to use as defense, producing odorous secretions that can be lethal to crustaceans and fish.[3]
In addition to obtaining toxic compounds through feeding on sponges,[3] research has found that Phyllidiids can possess symbiotic bacteria that creates bioactive compounds which can be used for defense.[10][12] The symbiotic bacteria in Phyllidiopsis shireenae can help protect the organisms by making them toxic or foul-tasting to predators and helping to fight infections.[10][12]
Phyllidiids, including P. shireenae, also use their thick bodies as defense because they have a mass of spicules for support which makes it difficult for predators to eat them.[3][2]
Phyllidiopsis shireenae has a bright coloration, which serves as a warning to predators, a process called aposematic signaling.[5][2]