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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Cladus: Pancrustacea
Superclassis: Oligostraca
Classis: Ichthyostraca – Ostracoda

Subclassis: Mystacocarida

Oligostraca Zrzavý, Hypša & Vlášková, 1997
Primary references

Zrzavý, J., Hypša, V. & Vlášková, M. 1997. Arthropod phylogeny: taxonomic congruence, total evidence and conditional combination approaches to morphological and molecular data sets. In: Fortey, R.A. & Thomas, R.H. (eds) Arthropod Relationships. Systematics Association Special Volume Series 55. Chapman & Hall, London. pp. 97–107. DOI: 10.1007/978-94-011-4904-4_9 Paywall. Reference page.


Oligostraca in the World Register of Marine Species

Oligostraca is a superclass of crustaceans.[2] It consist of the following three classes:[3]

Class Mystacocarida: Minute crustaceans (0.5 to 1 mm in length) restricted to interstitial marine sediments. Locomotion depends completely on the presence of dorsal and ventral substrates.[4]

Class Ostracoda (seed shrimp): Small planktonic, demersal and benthic crustaceans with a cosmopolitan aquatic distribution in both freshwater and marine environments, and a few in damp terrestrial habitats. Often called seed shrimps because their body is enclosed within a small and bivalved (with one exception) carapace, which makes them look like seed.[5]

Class Ichthyostraca:

Subclass Branchiura (fish lice): Ectoparasitic crustaceans on marine and freshwater fish, ranging in size from a few millimeters to 30 mm. A carapace is covering most of their body, which is dorso-ventrally flattened. They are able to switch hosts several times even as adults.[6][7]

Subclass Pentastomida (tongue worms): Vermiform endoparasites. The larvae develops in the tissues of mammals, reptiles, amphibians, fish, and a few species of coprophagous insects, which all are intermediate hosts. When eaten by other mammals, reptiles, amphibians and birds, which are the definitive hosts, the parasite develop to an adult (length 1–16 cm) found in the host's respiratory tracts. The genus Linguatula lives in the nasal cavity of mostly carnivorous mammals, but can also be found in humans, sheep and goats, and can sometimes reach the sinuses and middle ear.[8][9][10]


Zrzavý, J., Hypša, V. & Vlášková, M. (1997). Arthropod phylogeny: taxonomic congruence, total evidence and conditional combination approaches to morphological and molecular data sets. Systematics Association Special Volume series 55 (Eds. Fortey, R.A. & Thomas, R.H.), Chapman & Hall, London. pp.97-107
WoRMS (2018). Oligostraca. Accessed at: on 2018-04-10
Regier, Jerome C.; Shultz, Jeffrey W.; Zwick, Andreas; Hussey, April; Ball, Bernard; Wetzer, Regina; Martin, Joel W.; Cunningham, Clifford W. (February 2010). "Arthropod relationships revealed by phylogenomic analysis of nuclear protein-coding sequences". Nature. 463 (7284): 1079–1083. doi:10.1038/nature08742. ISSN 1476-4687. PMID 20147900. S2CID 4427443.
Functional morphology of locomotion in Derocheilocaris typica (Crustacea, Mystacocarida)
Collecting and processing marine ostracods - Oxford Academic
Marine Parasitology
Behavioural adaptations of argulid parasites (Crustacea: Branchiura) to major challenges in their life cycle
Case Report: Invasive Pentastomes, Raillietiella orientalis (Sambon, 1922), in a Free-Ranging Banded Water Snake (Nerodia fasciata) in North Central Florida, USA - PMC - NCBI
Respiratory System, Mediastinum, and Pleurae - PMC - NCBI
A 425-Million-Year-Old Silurian Pentastomid Parasitic on Ostracods


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