Siphonostomatoida

Siphon-mouth Copepods

Siphonostomatoida is an of copepods distinguished by -like and a frontal filament used for attachment. The order comprises 40 recognized , with approximately 75% of all fish-parasitizing copepods belonging to this group. Most are marine , though a few inhabit freshwater environments. Members exhibit diverse host associations, with 17 families parasitizing vertebrates (primarily fishes) and 23 families associated with .

Siphonostomatoida by (c) Donald Davesne, some rights reserved (CC BY), uploaded by Donald Davesne. Used under a CC-BY license.

Pronunciation

How to pronounce Siphonostomatoida: /sɪˌfoʊnoʊstɒməˈtɔɪdə/

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Habitat

Primarily marine; some in freshwater. Symbiotic associations include: on fish , body surfaces, and branchial ; association with marine including sponges, corals (e.g., Astroides calycularis), and other . Specific microhabitats documented include gills of rajiform hosts, body surface of serranid fishes, and internal cavities of sponges.

Distribution

Global marine distribution with records from: South African west and south coasts; Table Bay, South Africa; Strait of Gibraltar; Japan; Philippines; western North Pacific; Korean East Sea; Brazil (Rio de Janeiro, Abrolhos); Denmark; Norway; Sweden. Southern African waters currently document 16 , 75 , and 234 , though this represents a fraction of estimated global diversity.

Host Associations

Fishes (Actinopterygii) - Majority of ; includes Perciformes, Ophidiiformes, Beryciformes, Scorpaeniformes, Gobiidae
Rajiformes - ; documented for Schistobrachia and other
Elasmobranchs - Three Schistobrachia
Holocephalans - Two Schistobrachia
Sponges (Porifera) - Monocheres, Asterocheridae
Corals - Astroides calycularis Asterocheres tarifensis

Life Cycle

Postnaupliar developmental stages include copepodid I, chalimus II-IV stages, and . Chalimus stages and males of some (e.g., Lernaeenicus ramosus) recovered from branchial while metamorphosed females occur on body surface. Developmental of leg 4 has been observed to differ between congeneric species. Pre- stages documented for pennellid species.

Ecological Role

Parasitic and symbiotic copepods acting as on marine vertebrates and . Significant component of marine fish with potential impacts on . assessment in Southern African waters indicates underexplored diversity, particularly for invertebrate-associated .