Zooplankton
Guides
Acartia
Acartia is a genus of marine calanoid copepods comprising the majority of species in the family Acartiidae. They are small, planktonic crustaceans found primarily in temperate coastal and estuarine waters worldwide. The genus includes ecologically important species such as A. tonsa, which is among the most abundant and well-studied estuarine copepods globally. Acartia species serve as key intermediaries in aquatic food webs and are increasingly used as model organisms for studying coastal plankton dynamics, thermal ecology, and phylogeographic patterns.
Bosmina
water flea
Bosmina is a genus of small cladoceran crustaceans commonly known as water fleas. Members are distinguished from the related genus Bosminopsis by having antennae that are separated at their bases rather than fused. Bosmina species are filter feeders that consume algae and protozoans approximately 1–3 μm in size, using a dual feeding mechanism involving mesh-like setules on the second and third legs for filtering while the first leg grasps particles. The genus exhibits notable morphological plasticity, particularly in posterior mucrones and anterior antennules, which vary in response to predation pressure. Some Bosmina species have become invasive outside their native ranges, posing threats to aquatic ecosystems.
Bosmina freyi
Bosmina freyi is a small cladoceran crustacean in the family Bosminidae, described by De Melo and Hebert in 1994. It inhabits freshwater environments, with documented populations in tropical eutrophic reservoirs. Research has examined morphological plasticity in this species, particularly variation in body size, mucron length, and antennule morphology in response to environmental conditions.
Branchiopoda
Branchiopods
Branchiopoda is a class of small, primarily freshwater crustaceans unified by the presence of gills on their appendages—giving the group its name from Greek 'bránkhia' (gill) and 'poús' (foot). The class comprises fairy shrimp (Anostraca), tadpole shrimp (Notostraca), clam shrimp (Spinicaudata, Laevicaudata, Cyclestherida), and water fleas (Cladocera/Diplostraca), plus the extinct Devonian Lepidocaris. Most are filter-feeders on plankton and detritus, though notostracans are opportunistic omnivores. Many species inhabit temporary pools and produce desiccation-resistant resting eggs, allowing survival through dry periods.
Bythotrephes longimanus
Spiny Water Flea, Spiny Waterflea
Bythotrephes longimanus is a predatory planktonic cladoceran crustacean native to northern Europe and Asia that has become a significant invasive species in North America since its introduction to the Great Lakes in the 1980s. Adults reach up to 15 mm in length, with females growing substantially larger than males. The species exhibits cyclic parthenogenesis and produces distinctive morphological forms depending on reproductive mode and season. Its invasion has caused substantial ecological disruption through direct predation on native zooplankton and non-lethal effects that alter prey behavior and population dynamics.
Calanidae
Calanidae is the largest family of calanoid copepods, containing ecologically dominant genera including Calanus, potentially the most abundant metazoan genus on Earth. Members inhabit marine environments from surface waters to depths exceeding 400 m, with distributions spanning polar, temperate, and tropical oceans. The family exhibits significant vertical stratification and seasonal abundance patterns, with some species performing ontogenetic vertical migrations for overwintering. Calanidae species play critical roles in marine food webs as primary consumers and prey for fish and higher trophic levels.
Centropagidae
Centropagidae is a family of calanoid copepods comprising 14 genera and over 130 species. Members occupy diverse aquatic habitats including marine coastal waters, freshwater lakes, and saline lakes across the Southern Hemisphere, with notable concentrations in Australia, southern South America, subantarctic islands, and Antarctica. The family exhibits significant habitat diversity: marine genera include Centropages, Dussartopages, and Gladioferens; freshwater genera include Boeckella, Calamoecia, and Hemiboeckella. The genus Boeckella poppei represents the only terrestrial/freshwater invertebrate reported from all three main Antarctic biogeographic regions (subantarctic islands, maritime Antarctic, and continental Antarctic).
Chydorus
Chydorus is a genus of small benthic-littoral cladocerans in the family Chydoridae, established by William Elford Leach in 1816. Species in this genus are characterized by rounded, often reticulated carapaces and are among the most common anomopods in freshwater systems worldwide. The genus exhibits cosmopolitan distribution with multiple centers of diversification in Europe and Asia, and includes ecologically significant species such as Chydorus sphaericus, which dominates eutrophic waters and plays important roles in food web dynamics involving cyanobacteria.
Cladocera
water fleas
Cladocera is a suborder of small crustaceans commonly known as water fleas, ranging from 0.2–6 mm in size. They are found in freshwater environments worldwide, including rivers, lakes, swamps, and temporary pools, with some species inhabiting brackish water, groundwater, and even leaf axils or caves. These organisms play a central role in freshwater food webs as filter-feeders that consume phytoplankton, bacteria, and organic particles, while serving as essential prey for fish fry and predatory insect larvae. Their sensitivity to environmental changes makes them valuable bioindicators for water quality assessment.
Copepoda
copepods
Copepods are small aquatic crustaceans and one of the most abundant and diverse multicellular organisms on Earth. They occupy nearly every aquatic habitat, from marine plankton to deep ocean floors, freshwater lakes, groundwater systems, and even moist terrestrial environments such as leaf litter and bromeliad phytotelmata. The group includes free-living forms as well as highly modified parasites. Copepods are fundamental components of aquatic food webs, serving as critical prey for fish, whales, and other marine life, while also contributing to nutrient cycling and carbon sequestration through the biological pump.
Ctenopoda
Ctenopoda is an order of small crustaceans within the superorder Diplostraca, comprising three families: Holopediidae, Pseudopenilidae, and Sididae. Members are commonly known as water fleas and are predominantly freshwater inhabitants, though the genus Penilia is marine. The order is characterized by specialized swimming antennae and a body plan that reflects functional separation between locomotion and feeding appendages. Ctenopoda species have been documented across diverse aquatic habitats including lakes, reservoirs, wetlands, and coastal marine systems, with some species introduced to areas outside their native ranges by human activity.
Daphnia galeata
water flea
Daphnia galeata is a small planktonic crustacean inhabiting freshwater lakes across the Northern Hemisphere. The species exhibits pronounced phenotypic plasticity in response to environmental conditions, particularly food availability and predation risk. Two subspecies are recognized: D. g. galeata in the Old World and D. g. mendotae in North America, with hybrid populations occurring in the lower Great Lakes. It serves as a key model organism for studying predator-induced defenses and life-history evolution in aquatic systems.
Daphniidae
water fleas
Daphniidae is a family of small freshwater crustaceans in the order Anomopoda, commonly known as water fleas. The family contains approximately 121 species across five genera: Ceriodaphnia, Daphnia, Megafenestra, Scapholeberis, and Simocephalus. Daphniidae species are important model organisms in ecology, toxicology, and evolutionary biology, particularly the genus Daphnia. Many species have been accidentally introduced to regions outside their native ranges through human activity.
Diaptomidae
Diaptomidae is a family of freshwater pelagic copepods comprising approximately 50 genera. Members are the most widespread copepods in lentic inland waters of the Palearctic region. The family contains two subfamilies: Diaptominae and Paradiaptominae, with the latter consisting almost exclusively of African taxa. Diaptomids exhibit high species richness in tropical and Mediterranean regions, with numerous endemic species.
Diplostraca
water fleas, clam shrimps
Diplostraca is a superorder of small branchiopod crustaceans encompassing over 1,000 described species, commonly known as water fleas and clam shrimps. Members range from 0.2 to 6.0 mm in length (with Leptodora reaching 18 mm), and are characterized by a folded bivalved carapace covering an unsegmented-appearing body. The group exhibits cyclical parthenogenesis, alternating between asexual and sexual reproduction to produce dormant eggs. While predominantly freshwater, eight species have colonized marine environments—the only branchiopods to do so.
Epischura
Epischura is a genus of freshwater calanoid copepods in the family Temoridae. The genus contains approximately 11 recognized species, including the well-studied Epischura lacustris of North American lakes and the endemic Epischura baikalensis of Lake Baikal. Species within this genus exhibit diverse feeding strategies ranging from omnivory to predation, with documented consumption of both phytoplankton and zooplankton prey. The genus has been proposed as paraphyletic with respect to Heterocope, with suggestions to transfer the Siberian species E. baikalensis and E. chankensis to the resurrected genus Epischurella.
Epischura lacustris
Epischura lacustris is a predatory calanoid copepod in the family Temoridae. It inhabits freshwater lakes across northeastern North America, including all five Great Lakes. The species exhibits size-selective predation on small zooplankton, particularly Bosmina longirostris, and has been observed to consume both phytoplankton and animal prey. It can be distinguished from other Great Lakes calanoids by three stout caudal setae on each caudal ramus and a noticeably bent urosome in mature specimens.
Eurycercus longirostris
Eurycercus longirostris is a Holarctic cladoceran crustacean first described by Hann in 1982. A 2011 taxonomic revision synonymized E. vernalis with E. longirostris due to lack of morphological and genetic justification for their separation. The species has a broader distributional range than previously recognized and belongs to the subgenus Eurycercus (Eurycercus). As a member of the Eurycercidae family, it shares characteristics with other chydorid-like cladocerans including a rounded carapace and specialized feeding appendages.
Holopedium gibberum
Holopedium gibberum is a planktonic cladoceran distinguished by a large gelatinous mantle that encloses the body. The species exhibits pronounced phenotypic plasticity in mantle size as an inducible defense against invertebrate predators, particularly Chaoborus larvae. Populations show strong sensitivity to fish predation pressure, with distribution patterns reflecting avoidance of high-predation environments. The species demonstrates seasonal population dynamics tied to food availability and predation regimes, with reproductive investment varying in response to environmental stressors.
Holopedium glacialis
A small freshwater cladoceran crustacean in the family Holopediidae. The species was described in 2007 from Nearctic material and is distinguished from congeners by genetic and morphological characteristics. Like other members of the genus, it possesses a distinctive gelatinous mantle that encloses the body.
Hyperiidae
Hyperiidae is a family of amphipod crustaceans established by Dana in 1852. Members of this family are exclusively marine and are characterized by their obligate associations with gelatinous zooplankton, including jellyfish (Scyphozoa) and ctenophores. The family contains eight recognized genera: Euthemisto, Hyperia, Hyperiella, Hyperoche, Laxohyperia, Parathemisto, Pegohyperia, and Themisto. These amphipods are frequently documented as parasites or associates of their gelatinous hosts in pelagic marine environments.
Ilyocryptus
water fleas
Ilyocryptus is a genus of freshwater cladocerans (water fleas) in the family Ilyocryptidae. Species in this genus are characterized by a benthic lifestyle, inhabiting lake sediments and muddy substrates. The genus has a global distribution with notable diversity in the Neotropics and Far East. Several species groups have been identified, including the widespread I. spinifer group and the sarsi-group, with some taxa showing complex biogeographic patterns across transitional zones between boreal and tropical regions.
Leptodora
Invisible Water Flea
Leptodora is a genus of large, nearly transparent predatory cladocerans containing two species: L. kindtii, widespread in temperate lakes across the Northern Hemisphere, and L. richardii, known only from eastern Russia. Adults are among the largest planktonic cladocerans, reaching up to 21 mm in length, with approximately 98% transparency as a defense against fish predation. The genus is taxonomically isolated as the sole member of its family Leptodoridae and suborder Haplopoda.
Leptodoridae
Leptodoridae is a monotypic family of large predatory water fleas containing the single genus Leptodora. Members are among the largest cladocerans, reaching up to 18 mm in length. They are transparent, pelagic predators found in temperate lakes. The family is distinguished by its unique body plan and reduced carapace, representing a distinct lineage within the order Diplostraca.
Macrothricidae
Macrothricidae is a family of small freshwater crustaceans in the order Diplostraca (formerly Anomopoda), commonly known as water fleas. The family comprises approximately 17 genera and at least 80 described species. Macrothricids exhibit diverse ecological specializations and feeding mechanisms, with many species inhabiting littoral zones of lakes and ponds. The family remains among the least studied groups of Cladocera, with ongoing taxonomic revisions revealing previously unrecognized species diversity and biogeographic patterns.
Onychopoda
Onychopoda is a specialized order of predatory branchiopod crustaceans within the superorder Cladocera, distinguished by having only four pairs of legs (compared to five or six in related orders) and segmented raptorial appendages used for grasping prey. The order comprises three families (Cercopagididae, Podonidae, Polyphemidae), ten genera, and approximately 33 described species. Most species are endemic to the Ponto-Caspian basin, though some occur in freshwater and marine habitats worldwide. Onychopoda exhibits one of the most distinctive morphological and ecological radiations among cladocerans, having evolved predation as a novel feeding strategy and colonized habitats across a broad salinity range.
Ostracoda
Ostracods, Seed Shrimp
Ostracoda are small bivalved crustaceans, typically 0.5-2 mm in length, characterized by a hinged carapace that completely encloses the body. They exhibit remarkable diversity with over 33,000 described species and an estimated 70,000 total species when fossil forms are included. The group occupies virtually all aquatic environments from deep ocean trenches to temporary freshwater pools, with some species adapted to moist terrestrial microhabitats. Their calcified carapaces provide excellent fossil preservation, making them valuable for paleoecological and biostratigraphic studies.
Penilia avirostris
Penilia avirostris is a marine cladoceran crustacean in the family Sididae, distributed across temperate and tropical coastal waters worldwide. It is a holoplanktonic species that exhibits cyclical parthenogenesis, with populations shifting between asexual and sexual reproduction in response to environmental cues. The species has been observed to undergo diel vertical migration and shows strong sensitivity to temperature, with optimal growth around 18°C but tolerance ranging from 12°C to 30°C. Population dynamics are closely tied to seasonal temperature fluctuations, with dramatic increases reported in warming waters.
Petrolisthes armatus
Green Porcelain Crab
Petrolisthes armatus, commonly known as the green porcelain crab, is a small porcellanid crab native to the southwestern Atlantic, particularly Brazil. The species has established invasive populations along the southeastern United States coast, where densities can exceed 30,000 individuals per square meter. Genetic studies confirm it as a single monophyletic species with exceptional geographic range spanning the Atlantic and eastern Pacific. It is frequently parasitized by the bopyrid isopod Aporobopyrus curtatus, which causes parasitic castration.
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Picripleuroxus is a genus of small freshwater cladocerans (water fleas) in the family Chydoridae. Members of this genus are benthic or epiphytic microcrustaceans inhabiting lakes and ponds. The genus was established by Frey in 1993 and is distinguished by specific morphological features of the carapace and postabdomen.
Picripleuroxus denticulatus
Picripleuroxus denticulatus is a species of small freshwater crustacean in the family Chydoridae, commonly known as water fleas or chydorid cladocerans. The species was described by Birge in 1879 and is distributed across multiple continents including the NeArctic, PalaeArctic, and AfroTropical regions. Records indicate presence in Brazil across multiple states. As a member of the Chydoridae, it inhabits freshwater environments where it contributes to aquatic food webs.
Polyphemidae
Polyphemidae is a family of predatory water fleas (Branchiopoda) containing the single genus Polyphemus with two recognized species: P. pediculus and P. exiguus. Members are characterized by large, raptorial antennae used for capturing prey and a reduced carapace that leaves the body exposed. P. pediculus has a broad Holarctic distribution in freshwater and brackish habitats, while P. exiguus is restricted to the Caspian Sea. Cryptic species have been identified within P. pediculus due to allopatric speciation.
Pugettia
kelp crabs
Pugettia is a genus of marine kelp crabs in the family Epialtidae, distributed across the North Pacific from North America to East Asia. Species inhabit shallow subtidal zones, primarily associated with macroalgal habitats including kelp beds, Sargassum stands, and red algal turfs. Many species exhibit ontogenetic habitat shifts, with juveniles and smaller individuals occupying deeper algal turfs while larger adults migrate to shallower macroalgal beds. The genus includes approximately 25 extant species plus one fossil species, with several species serving as important subjects for studies of crab growth, reproduction, and habitat ecology.
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Sapphirinidae is a family of copepods in the order Cyclopoida, established by Thorell in 1859. The family includes three genera: Copilia, Sapphirina, and Vettoria. Members exhibit striking sexual dimorphism in coloration, with males displaying bright, iridescent colors while females remain transparent. They are found in marine environments.
Simocephalus serrulatus
Simocephalus serrulatus is a freshwater cladoceran crustacean in the family Daphniidae. It is a cosmopolitan zooplankton species found across multiple continents including Australasian, Afrotropical, Nearctic, and Neotropical regions. The species has been used in ecotoxicological studies, particularly research on per- and polyfluoroalkyl substances (PFAS) tolerance and population-level variation in life history traits.
Temoridae
Temoridae is a family of calanoid copepods established by Giesbrecht in 1893. The family includes seven genera: Epischura, Epischurella, Eurytemora, Ganchosia, Heterocope, Lahmeyeria, and Temora. Members inhabit diverse aquatic environments ranging from freshwater lakes to brackish estuaries and marine coastal waters. The genus Eurytemora has been extensively studied due to its species complex containing cryptic species with significant genetic and morphological heterogeneity.