Goniodoris barroisi

Definition
Goniodoris barroisi is a marine gastropod mollusk belonging to the order Nudibranchia, commonly known as a dorid nudibranch or sea slug. It is placed within the family Goniodorididae.

Overview

• Taxonomic classification

  • Kingdom: Animalia
  • Phylum: Mollusca
  • Class: Gastropoda
  • Subclass: Heterobranchia
  • Order: Nudibranchia
  • Suborder: Doridina
  • Family: Goniodorididae
  • Genus: Goniodoris
  • Species: G. barroisi

• Authority and description
  The species was originally described by the French naturalist Antoine Risso in 1818. In early literature it appeared under the name Doris barroisi; subsequent taxonomic revisions transferred it to the genus Goniodoris.

• Distribution
  Records of G. barroisi are primarily from the Mediterranean Sea, especially along the coasts of France, Italy, and the western basin. Occurrences elsewhere have not been reliably documented.

• Synonymy
  Some modern taxonomic databases treat Goniodoris barroisi as a synonym of Goniodoris nodosa (Müller, 1776). The validity of the name thus varies among sources; at present, both usages appear in the scientific literature.

Etymology / Origin
The generic name Goniodoris derives from Greek roots: “gonio‑” meaning “angle” or “corner” and “‑doris”, a traditional suffix used for dorid nudibranchs, referencing the animal’s angular mantle features.
The specific epithet barroisi is a Latinized honorific, likely referring to the French naturalist Pierre‑Auguste Barrois (1797–1870), who contributed to early marine natural history. The exact dedication is not explicitly documented in the original description.

Characteristics

• Morphology: As typical of Goniodoris species, G. barroisi possesses an elongate, dorsoventrally flattened body with a smooth mantle. The dorsal surface bears a pair of sensory rhinophores and a circlet of branchial plumes (gills) positioned toward the posterior margin.
• Size: Reported adult lengths range from 10 mm to 20 mm, although precise measurements for this taxon are limited.
• Coloration: Historical illustrations depict a generally pale or translucent background with brownish or orange mottling; however, coloration may vary with habitat and diet.
• Ecology: Species of Goniodoris are known to feed on sessile invertebrates such as bryozoans and colonial ascidians. Specific prey items for G. barroisi have not been definitively recorded, and therefore accurate ecological details are not confirmed.
• Reproduction: Like other nudibranchs, G. barroisi is hermaphroditic, laying egg ribbons that develop into free‑swimming veliger larvae before settlement.

Related Topics

• Nudibranchia – the diverse group of shell‑less marine gastropods to which this species belongs.
• Goniodorididae – the family encompassing Goniodoris and allied genera.
• Mediterranean marine biodiversity – the broader ecological context of the species’ known range.
• Pierre‑Auguste Barrois – a 19th‑century French naturalist possibly honored by the species epithet.
• Synonymy in taxonomy – the process by which multiple scientific names may refer to a single species, exemplified by the G. barroisi / G. nodosa relationship.

Note: Certain aspects of the biology, distribution, and taxonomic status of Goniodoris barroisi remain subject to ongoing research. Where precise data are lacking, the entry explicitly indicates that “Accurate information is not confirmed.”