Doriopsilla
A genus of dorid nudibranchs lacking a radula.
Doriopsilla is a genus of sea slugs, a type of dorid nudibranch. These are shell-less marine gastropod molluscs belonging to the family Dendrodorididae. The genus is often confused with *Dendrodoris*, partly because neither has a radula. Instead of using this typical mollusc feeding structure, they secrete enzymes to dissolve their sponge prey externally, then absorb the sponge cells while leaving the skeleton behind. This feeding method and the loss of the radula are also seen in the Phyllidiidae family, but *Doriopsilla* looks more like other dorid nudibranchs: it has a rosette of gills surrounding a dorsal anus, whereas Phyllidiidae keep their gills under the mantle edge.
Quick Facts
- Taxon
- Doriopsilla
Facts from the source article.
Lore & Background
Doriopsilla and Dendrodoris are genera that have frequently been confused, partly because both lack a radula. They feed by dissolving their sponge food externally, using enzymes, and then ingesting sponge cells without the sponge skeleton. This loss of the radula and method of feeding is shared with the Phyllidiidae, but Doriopsilla looks more like other dorid nudibranchs in having a rosette of gills surrounding a dorsal anus, whereas Phyllidiidae have the gills located beneath the edge of the mantle.
The genus includes many described species, such as Doriopsilla albopunctata, Doriopsilla areolata, Doriopsilla aurea, Doriopsilla bertschi, Doriopsilla capensis, Doriopsilla carneola, Doriopsilla davebehrensi, Doriopsilla debruini, Doriopsilla elitae, Doriopsilla espinosai, Doriopsilla fulva, Doriopsilla gemela, Doriopsilla janaina, Doriopsilla miniata, Doriopsilla nigrocera, Doriopsilla nigrolineata, Doriopsilla pallida, Doriopsilla peculiaris, Doriopsilla pelseneeri, Doriopsilla pharpa, Doriopsilla rowena, Doriopsilla spaldingi, and Doriopsilla tishae. Several species have been brought into synonymy, including Doriopsilla ciminoi, Doriopsilla fedalae, Doriopsilla leia, Doriopsilla nigromaculata, Doriopsilla pusilla, and Doriopsilla rarispinosa.
Reader's Guide
The significance of Doriopsilla lies in its distinctive feeding strategy and taxonomic relationships. As a genus within Dendrodorididae, it exemplifies a group of sea slugs that have lost the radula, a key evolutionary adaptation. Instead, they externally digest sponge food using enzymes, a method shared with Phyllidiidae, though Doriopsilla retains the typical dorid nudibranch appearance with a rosette of gills surrounding a dorsal anus. This contrasts with Phyllidiidae, which have gills beneath the mantle edge. The frequent confusion between Doriopsilla and Dendrodoris highlights the challenges in distinguishing genera based on shared derived traits like radula loss. The extensive list of species, including several brought into synonymy, reflects ongoing taxonomic refinement. The genus contributes to understanding nudibranch diversity and the evolutionary pathways of feeding mechanisms in marine gastropods.
Did You Know?
- Doriopsilla lacks a radula, a feeding structure typical of many molluscs.
- It feeds by dissolving sponge food externally using enzymes, then ingesting sponge cells without the sponge skeleton.
- Several species, such as Doriopsilla ciminoi and Doriopsilla fedalae, have been brought into synonymy.
Frequently Asked Questions
What is Doriopsilla?
Doriopsilla is a genus of shell-less dorid nudibranchs (sea slugs) classified within the family Dendrodorididae. These marine gastropod molluscs are recognized for their distinctive body shape and a highly specialized sponge-feeding strategy.
How does Doriopsilla eat without a radula?
Rather than using the typical molluscan scraping tongue, Doriopsilla species secrete digestive enzymes onto their sponge prey to break it down externally. They then absorb the dissolved sponge cells directly, leaving the rigid sponge skeleton untouched.
What's the difference between Doriopsilla and Dendrodoris?
Both genera lack a radula, which is why they are frequently mixed up, but Doriopsilla retains a visible rosette of gills encircling a dorsal anus. This gives it a more classic dorid nudibranch silhouette than Dendrodoris.
Where are the gills located on a Doriopsilla?
Doriopsilla bears a circular cluster (rosette) of gills positioned around its dorsal anus on the upper surface of the body. This arrangement is a hallmark of its dorid nudibranch appearance.
Why is Doriopsilla's feeding method considered unusual?
Most molluscs rely on a radula to scrape or cut food, but Doriopsilla has completely lost that structure. Instead, it digests sponges outside its body with enzymes and simply takes in the soft cellular material, a strategy it shares with the Phyllidiidae family.
More in Nudibranchs and Sea Slugs, Part 2 1-24
Spotted an error? Know more?
Reader corrections go straight into our review queue. Suggest an edit · How this site is sourced