Sponge-associate
Guides
Siphonostomatoida
Siphon-mouth Copepods
Siphonostomatoida is an order of copepods distinguished by siphon-like mandibles and a frontal filament used for host attachment. The order comprises 40 recognized families, with approximately 75% of all fish-parasitizing copepods belonging to this group. Most species are marine symbionts, though a few inhabit freshwater environments. Members exhibit diverse host associations, with 17 families parasitizing vertebrates (primarily fishes) and 23 families associated with invertebrates.
copepodparasitemarinefish-parasitesymbiontcrustaceanectoparasiteSiphonostomatoidabiodiversitySouthern-AfricaJapanBrazilsponge-associatecoral-associatedevelopmental-stageschalimusfrontal-filamentsiphon-mandibleAsterocheridaeLernaeopodidaePennellidaeHatschekiidaeSphyriidaeNotodelphyidaeBotryllophilidaeStenopodidea
Coral and Glass Sponge Shrimps, Boxer Shrimps
Stenopodidea is a small infraorder of decapod crustaceans comprising 71 extant species in 12 genera, commonly known as coral and glass sponge shrimps or boxer shrimps. Despite their common names, they are distinct from both Caridea (true shrimp) and Dendrobranchiata (prawns), representing a separate lineage within Pleocyemata more closely related to reptant decapods such as lobsters and crabs. Members are characterized by a greatly enlarged third pair of pereiopods, non-branching gills, and egg-brooding reproduction. The group includes three fossil species, with the earliest known from the Devonian period.
Unionicola
Unionicola is a genus of freshwater water mites (family Unionicolidae) described by Haldeman in 1842. The genus has cosmopolitan distribution and comprises parasitic species primarily associated with molluscan hosts, though some species associate with freshwater sponges. Most species infest unionid mussels, while U. crassipes and U. minor are associated with Spongillidae sponges. The mite-host relationship involves consumption of host mucus and tissue, with potential negative effects on host fitness.