Oniscidae

Belongs within: Crinocheta. The Oniscidae are a group of terrestrial isopods with a well-developed frontal line across the head. Members of the genus Oniscus have a flattened, elliptical body with prominent anterolateral processes on the head and an elongate telson (Muchmore 1990). Characters (from Vandel 1973): Cephalon with strongly marked frontal line, with three projecting… Continue reading Oniscidae

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Categorised as Isopoda

Idothea

Belongs within: Valvifera. Idothea is a genus of broad-bodied isopods that may be found living on floating vegetation (Hatch 1947). They are predominantly grazers on macrophytes, and coloration in some species may change depending on the food species. The North Atlantic species I. baltica is found in the subtidal zone near the shore. Characters (from… Continue reading Idothea

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Categorised as Isopoda

Armadillo

Belongs within: Armadillidae. Armadillo is a genus of terrestrial isopods found in the Mediterranean region and western Asia. Members of the genus have an incision in the posterior angle of the first pleurepimerite which is prolonged by a well-developed lateral gutter, allowing the body to be tightly enrolled (Vandel 1973). The species A. officinalis has… Continue reading Armadillo

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Cymothoa

Belongs within: Cymothoida. Cymothoa is a genus of marine isopods that are parasitic or commensal on fishes. Characters (from Menzies & Kruczynski 1983): Cephalon more or less deeply immersed in pereonite I. First antennae widely separated at base. Pereonite I longer than pereonite II. Pleon immersed in pereonite VII. Uropoda of mature adult much shorter… Continue reading Cymothoa

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Armadillidae

Belongs within: Crinocheta.Contains: Buddelundia, Cubaris, Armadillo. The Armadillidae are a group of terrestrial isopods characterised by relatively short uropods forming part of the even posterior outline of the body (Muchmore 1990). Characters (from Muchmore 1990): Eyes compound, of many ocelli. Second antenna with two-segmented flagellum, flagellum nearly as stout as basal segments. Uropods not extending… Continue reading Armadillidae

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Sphaeromatidae

Belongs within: Sphaeromatidea.Contains: Monolistrini. The Sphaeromatidae are a group of marine isopods capable of rolling into a compact ball (Menzies & Kruczynski 1983). Most species exhibit strong sexual dimorphism with males being more heavily sculpted than females. They have been divided into subfamilies based on the structure of pleopods 4 and 5, with Dynameninae and… Continue reading Sphaeromatidae

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Asellus (Asellus)

Belongs within: Asellidae. The subgenus Asellus of the genus freshwater isopod genus Asellus is characterised by a lack of spines on the propodite of the male first legs (Hatch 1947). Representatives include the Holarctic species A. aquaticus which has cultivated as a source of fish food. Characters (from Hatch 1947): Body usually elongate, depressed. Head… Continue reading Asellus (Asellus)

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Sphaeromatidea

Belongs within: Scuticoxifera.Contains: Sphaeromatidae. The Sphaeromatidea are a clade of marine isopods with the underside of the pleotelson vaulted, defining a branchial chamber (Brandt & Poore 2003). Characters (from Brandt & Poore 2003): Pleonites variously fused (rarely 1–5 free), pleonite 1 narrower than others (similar in Plakarthrium). Pleotelson underside vaulted, branchial chamber defined by ridges… Continue reading Sphaeromatidea

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Cymothoida

Belongs within: Scuticoxifera.Contains: Cirolaninae, Eurydicinae, Gnathiidae, Anthuroidea, Corallanidae, Aegidae, Epicaridea, Lironeca, Nerocila, Cymothoa, Anilocra. The Cymothoida is a diverse group of mostly marine isopods, including both free-living and parasitic forms. Characters (from Brandt & Poore 2003): Pleonites 1–5 free, pleonite 1 similar to others (some pleonites fused in some species). Pleotelson underside flat, without ventrolateral… Continue reading Cymothoida

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Categorised as Isopoda

Limnoriidea

Belongs within: Scuticoxifera. The Limnoriidea are a group of marine isopods united by the absence of a mandibular molar (Brandt & Poore 2003). The gribble Limnoria lignorum is a significant pest of marine timbers, gnawing into exposed wood (Hatch 1947). Characters (from Brandt & Poore 2003): Pleonites 1–5 or 1–4 free, pleonite 1 similar to… Continue reading Limnoriidea

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Categorised as Isopoda