Belongs within: Palaeocopida. The Youngiellacea are a group of very small ostracods known from the Upper Devonian and Carboniferous periods (Benson et al. 1961). Characters (from Benson et al. 1961): Carapace minute, suboblong, with straight taxodont hinge bearing vertical teeth and sockets. Surface smooth, reticulate or ridged. <==Youngielloidea [Youngiellacea] | i. s.: Schweyerina Zaspelova 1952BB61… Continue reading Youngielloidea


Belongs within: Oligostraca.Contains: Paleodarwinula, Archaeocopida, Cypridinida, Halocypridida, Leperditicopida, Healdiocopina, Sigilliocopina, Cytherocopina, Darwinulocopina, Cypridocopina, Bairdiidae, Bythocypris, Palaeocopida, Platycopida. The Ostracoda are a class of mostly aquatic (both freshwater and marine) crustaceans in which the body is enclosed within a bivalved, usually calcified carapace. Most ostracods are relatively small (1.5 mm or less) though there are some… Continue reading Ostracoda


Belongs within: Cytheroidea. The Cytherinae are a group of marine ostracods with central muscle scars on the carapace comprising a vertical row of four small adductor muscle scars, a V-shaped antennal scar, and a small mandibular scar. <==Cytherinae [Cytherini] |–Abditacythere Hartmann 1964DH86 | `–A. subterranea Hartmann 1964DH86 |–Corallicythere Hartmann 1974DH86 | `–C. verrucosa Hartmann 1974DH86… Continue reading Cytherinae


Belongs within: Cytherocopina.Contains: Cobanocythere, Loxoconchinae, Cytherinae, Schizocytherinae. The Cytheroidea are a primarily marine group of ostracods that are first known from the Middle Ordovician (Benson et al. 1961). Many cytheroids are highly ornamented. Freshwater cytheroids are known from the families Kliellidae, Leptocytheridae and Loxoconchidae. The Loxoconchidae, also including shallow marine species, have a reniform to… Continue reading Cytheroidea


Belongs within: Cypridocopina.Contains: Stenocypridini, Cypris. The Cyprididae are a group of ostracods found in marine and fresh waters with a generally smooth carapace lacking interlocking teeth in the dorsal hinge. The furcal rami are typically well developed in the subfamily Cypridinae but are reduced to a base ending distally in a seta in the Cypridopsinae… Continue reading Cyprididae


Belongs within: Ostracoda.Contains: Suchonellina, Cyprididae, Candonidae, Ilyocyprididae, Cyprideidae. The Cypridocopina are a group of ostracods in which three pairs of thoracic legs are present, with the first pair modified to function as a mouthpart and the third pair is bent dorsally and used as a cleaning organ, and the body bears a terminal furca (Benson… Continue reading Cypridocopina


Belongs within: Candonidae. Eucandona is a genus of candonid ostracods characterised by the smooth gamma seta on the mandibular palp. It has been recognised in the fossil record at least as early as the Triassic (Benson et al. 1961). Characters (from Benson et al. 1961): Elongate, medium-sized, subreniform, moderately convex, highest posterior to middle; dorsum… Continue reading Eucandona


Belongs within: Cyprididae. Cypris is a cosmopolitan genus of freshwater ostracods (Benson et al. 1961). Characters (from Benson et al. 1961): Elongate subtriangular, dorsum strongly convex, annulate medially; venter flattened, slightly concave, terminal margins spinose, posterior end bluntly pointed, extended below; valves subequal; surface smooth or pitted. Inner lamellae moderate in width, broadest in front.… Continue reading Cypris


Belongs within: Oligostraca. The Argulidae, fish lice, are a group of ectoparasitic crustaceans with a flattened, oval body mostly covered by a broad carapace. The mouthparts and antennae are modified to form a grasping proboscis. <==Argulidae [Argulia, Argulidea, Arguloida, Branchiura, Dipteropeltidae] |–DolopsC30 | |–D. geayiC30 | `–D. striataC30 `–ArgulusRS10 |–A. alosaM02 |–A. americanusWS10 |–A. bicolorK-M02a… Continue reading Argulidae


Belongs within: Palaeocopida. Kirkby’s small ostracods (or small Kirkby’s ostracods) Published 11 July 2022 I do not envy those who find themselves working with ostracods. These minute crustaceans, typically less than a millimetre in length, seem altogether too fiddly to handle. Nevertheless, the long history of ostracods, together with their diversity and the high fossilisation… Continue reading Kirkbyelloidea