Taxonomy and Biodiversity of Marine Amphipods

Marine amphipods comprise a hyperdiverse order of peracarid crustaceans characterised by laterally compressed bodies and remarkable ecological versatility. Taxonomic frameworks have traditionally relied on detailed morphological characters—gnathopod structure, uropod arrangement and setal patterns—to delimit families, genera and species. In recent decades, integrative approaches combining molecular markers with classical morphology have uncovered extensive cryptic diversity, reshaping our understanding of species boundaries and evolutionary relationships. Amphipods occupy virtually all marine habitats, from intertidal zones and seagrass meadows to deep-sea trenches, often forming specialised associations as commensals or symbionts within sponges, ascidians and corals. Their high rates of endemism in hotspots such as the Southern Ocean, Caribbean Sea and Indo-Pacific underscore global biogeographical patterns, while some taxa have emerged as invasive colonisers with economic and ecological impacts. Beyond taxonomy, studies of amphipod biodiversity inform ecosystem monitoring, bioindicator development and conservation planning. Ongoing challenges include incomplete sampling of cryptic and deep-sea fauna, standardisation of taxonomic keys, and the need for accessible digital repositories of voucher specimens and genetic data.

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Taxonomy and Biodiversity of Marine Amphipods publication trend

The graph below shows the total number of articles in taxonomy and biodiversity of marine amphipods across all publications each year (not limited to Nature Index journals).

Technical terms

Amphipoda: An order of peracarid crustaceans characterised by laterally compressed bodies and two pairs of antennae, comprising thousands of marine species.

Taxonomy: The science of defining and naming groups of biological organisms on the basis of shared characteristics and evolutionary relationships.

Biodiversity: The variety and variability of life within a given ecosystem, region or on the entire Earth, encompassing species richness and genetic variability.

Commensalism: A type of species interaction in which one organism benefits while the other is neither helped nor harmed.

Phylogenetic signal: A measure of the tendency for related species to resemble each other in trait values more than species drawn at random from the same tree.

Endemism: The ecological state of a species being unique to a defined geographic location and found nowhere else.

References

1. The Ascidian–Amphipod Association between Phallusia mammillata (Cuvier, 1815) and Leucothoe richiardii (Lessona, 1865) in the Mar Grande of Taranto (Mediterranean Sea, Italy). Journal of Marine Science and Engineering (2023).
2. Phylogeny as a Proxy for Ecology in Seagrass Amphipods: Which Traits Are Most Conserved?. PLOS ONE (2013).
3. A taxonomic revision helps to clarify differences between the Atlantic invasive Ptilohyale littoralis and the Mediterranean endemic Parhyale plumicornis (Crustacea, Amphipoda). ZooKeys (2018).