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Family of basal chelicerates
Horseshoe crabs are arthropods of the family Limulidae and the only surviving xiphosurans. Despite their name, they are not crabs or even crustaceans;
Horseshoe_crab
Species of arthropod
The Atlantic horseshoe crab (Limulus polyphemus), also known as the American horseshoe crab, is a species of horseshoe crab, a kind of marine and brackish
Atlantic_horseshoe_crab
Species of arthropod
The mangrove horseshoe crab (Carcinoscorpius rotundicauda), also known as the round-tailed horseshoe crab, is a species of horseshoe crab, a chelicerate
Mangrove_horseshoe_crab
Species of arthropod
horseshoe crab, Indonesian horseshoe crab, Indian horseshoe crab, or southern horseshoe crab, is one of the four extant (living) species of horseshoe
Tachypleus_gigas
Group of crustaceans
including the hermit crabs, mole crabs, king crabs, and porcelain crabs. A distantly-related group of arthropods, the horseshoe crabs, with an armoured carapace
Crab
Species of arthropod
commonly known as the Chinese horseshoe crab, Japanese horseshoe crab, or tri-spine horseshoe crab, is a species of horseshoe crab found in Southeast and East
Tachypleus_tridentatus
Species of bird
the abundance of horseshoe crab eggs as their main food source during migration. The relationship between red knot and horseshoe crab is evolutionarily
Red_knot
Fiberglass roadside sculpture in Lenox, Alabama, United States
The World's Largest Horseshoe Crab is a fiberglass and foam roadside sculpture located along Coneca 7 near Lenox, Alabama, United States. Nicknamed "Crabbie"
World's Largest Horseshoe Crab
World's_Largest_Horseshoe_Crab
Order of marine chelicerates
of arthropods related to arachnids. They are more commonly known as horseshoe crabs (a name applied more specifically to the only extant family, Limulidae)
Xiphosura
Visual organs possessed by arthropods
also have apposition eyes. They are also possessed by Limulus, the horseshoe crab, and there are suggestions that other chelicerates developed their simple
Arthropod_eye
Type of mating behavior exhibited by some externally fertilizing species
externally fertilizing species (chiefly amphibians, amphipods, and horseshoe crabs) in which a male grasps a female with his front legs as part of the
Amplexus
Subphylum of arthropods
Arthropoda, alongside Mandibulata. Chelicerates include the sea spiders, horseshoe crabs, and arachnids (including harvestmen, scorpions, spiders, solifuges
Chelicerata
American alternate rock band
of their third full-length album, Everyone Else. The first single, "Horseshoe Crab", premiered via Noisey on August 10, 2016, was explained as "a dark
Slothrust
Chemical used for the detection and quantification of bacterial endotoxins
aqueous extract of motile blood cells (amebocytes) from the Atlantic horseshoe crab Limulus polyphemus. LAL reacts with bacterial endotoxins such as lipopolysaccharides
Limulus_amebocyte_lysate
Class of arthropods
Chattopadhyay, Balaji; et al. (2020). "Chromosome-level assembly of the horseshoe crab genome provides insights into its genome evolution". Nature Communications
Arachnid
Species of marine flatworm
commensalistic relationship with the Atlantic horseshoe crab, Limulus polyphemus, living in the horseshoe crab's book gills and around joints and legs. The
Bdelloura_candida
Type of lung commonly found in arachnids
adaptation of the book gills seen in aquatic chelicerates such as horseshoe crabs, where the gills are ventral appendages under the abdomen (opisthosoma)
Book_lung
Genus of horseshoe crab relatives
M. Rudkin, Graham A. Young & Godfrey S. Nowlan (2008). "The oldest horseshoe crab: a new xiphosurid from Late Ordovician Konservat-Lagerstätten deposits
Lunataspis
Estuary in the U.S. states of Delaware and New Jersey
which serves as a breeding ground for many aquatic species, including horseshoe crabs. The bay is also a prime oystering ground. Delaware Bay was designated
Delaware_Bay
Mouthparts of spiders and horseshoe crabs
subphylum Chelicerata, an arthropod group that includes arachnids, horseshoe crabs, and sea spiders. Commonly referred to as "jaws", chelicerae may be
Chelicerae
Genus of horseshoe crabs
Limulus is a genus of horseshoe crab, with one extant species, the Atlantic horseshoe crab (Limulus polyphemus). One fossil species is currently assigned
Limulus
Order of arthropods (fossil)
breathe air above water, while Blattfüssen, similar to organs in modern horseshoe crabs, would cover the parts that serve for underwater respiration. The appendages
Eurypterid
Hard, protective outer layers created by an animal that lives in the sea
other shells that can be found on beaches are those of barnacles, horseshoe crabs and brachiopods. Marine annelid worms in the family Serpulidae create
Seashell
Genus of horseshoe crab relatives
Mesolimulus is an extinct genus of horseshoe crab. The best known examples are found in Solnhofen limestone near Solnhofen, Bavaria, Germany. Originally
Mesolimulus
Phylum of invertebrates with jointed exoskeletons
head. The four major groups of arthropods – Chelicerata (sea spiders, horseshoe crabs and arachnids), Myriapoda (symphylans, pauropods, millipedes and centipedes)
Arthropod
Extinct genus of horseshoe crab relatives
Liomesaspis is an extinct genus of xiphosuran, related to the modern horseshoe crab. It lived from the late Carboniferous to the Early Permian. Evolution:
Liomesaspis
Cell type in the circulatory system of invertebrates
in the blood or body fluid (e.g. as the blood cells of Limulus, the horseshoe crab) and play a role in the defense of the organism against pathogens. Depending
Amebocyte
Legendary sea-dwelling creature
Iceland Hafmaður Arnarfjörður, Westfjords, Iceland Giant Great South Bay Horseshoe Crab The Bloop, a underwater recording in 1997 was theorised to be a sea
Sea_monster
Chinese Snack
savory fillings, and occasionally horseshoe crab eggs (from which its name derives, as "鱟" refers to the horseshoe crab). It is often steamed or fried,
Hao_kuih
List with all urban legends currently on Wikipedia
The Great South Bay Giant Horseshoe Crab is an urban legend about a new cryptid species of giant eight foot long horseshoe crabs inhabiting the waters off
List_of_urban_legends
Hindmost division of an arthropod body
fossil species (like in eurypterids) and in extant animals (like the horseshoe crab "tail" and the scorpion sting). Some authorities have urged that the
Telson
Island in New York
Bay News. Additionally, in 2025 an urban legend about a giant cryptid horseshoe crab species appearing in the waters around the island has emerged and spread
Fire_Island
Appendage of chelicerate
chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to the chelicerae ("jaws")
Pedipalp
Class of arthropods
the extinct Eurypterida (sea scorpions) and the extant Xiphosura (horseshoe crabs). The term was originally used by James Dwight Dana to refer to Xiphosura
Merostomata
Topics referred to by the same term
Indiana Horseshoe Tavern, a bar in downtown Toronto Atlantic horseshoe crab, Limulus polyphemus Horseshoe crab, a marine arthropod Horseshoe bat Horse
Horseshoe_(disambiguation)
species Godzillius robustus, at up to 4.5 cm (1.8 in). The four modern horseshoe crabs are of roughly the same sizes, with females measuring up to 60 cm (2
Largest_and_heaviest_animals
Species of horseshoe crab
Tachypleus syriacus is an extinct species of horseshoe crab in the genus Tachypleus that lived in the Sannine Formation of Lebanon during the Cenomanian
Tachypleus_syriacus
2020. "International Horseshoe Crab Day 2022". Wildlife Around the World. Retrieved 8 October 2022. "International Horseshoe Crab Day: a celebration of
List_of_environmental_dates
Genus of primitive horseshoe crab
Indiana, United States. It is one of the earliest known relatives of horseshoe crabs in the fossil record, informing understanding of their early diversification
Ciurcalimulus
Extinct genus of horseshoe crab relative
exoskeleton was very thin, similar to some modern benthic crabs. Many Paleozoic horseshoe crabs which were likely capable of swimming have many spines,
Alanops
Taxonomic group with only one subordinate taxon
making it not strictly monotypic. The mangrove horseshoe crab, also known as the round-tailed horseshoe crab, is the only species of the monotypic genus
Monotypic_taxon
Extinct family of arthropods
modern horseshoe crabs. The central nervous system in an exceptionally preserved specimen of Euproops is very similar to that of living horseshoe crabs and
Belinuridae
Class of marine arthropods
their traditional classification as a member of chelicerates alongside horseshoe crabs and arachnids has regained wide support in subsequent studies. Many
Sea_spider
Zoo in Massachusetts, USA
The touch tanks let visitors get close to local species such as crabs, Horseshoe crabs, and clams. The aquarium's highlights include a touch tank which
Maria_Mitchell_Aquarium
Production of agriculture products from cell cultures
Bioscience is building a platform for biosynthetic horseshoe crab blood production. Horseshoe crab blood contains limulus amebocyte lysate (LAL), which
Cellular_agriculture
Genus of Devonian arthropod
is sometimes classified as synziphosurine, a paraphyletic group of horseshoe crab-like fossil chelicerate arthropods, while some studies compare its morphology
Willwerathia
Genus of horseshoe crab relatives
Tachypleus is a genus of south, southeast and east Asian horseshoe crabs in the family Limulidae. There are two extant (living) species: Tachypleus gigas
Tachypleus
Extinct class of arthropods
stem-group chelicerates (the group containing arachnids, sea spiders and horseshoe crabs, among other extinct groups) or stem-group arthropods outside the split
Megacheira
Extinct genus of chelicerate
those of horseshoe crabs. Weinbergina may have been a benthic animal with some degree of swimming ability, similar to modern horseshoe crabs. However
Weinbergina
Bay in New York State, United States
Retrieved April 3, 2025. Epstein, Skylar (April 1, 2025). "Gigantic Horseshoe Crab Reported in Great South Bay » Fire Island News & Great South Bay News"
Great_South_Bay
Town in Delaware, United States
of hordes of horseshoe crabs that emerge from the waters of Delaware Bay to lay their eggs on the beach. Changing tides leave many crabs stranded, so
Slaughter_Beach,_Delaware
Paradox relating to genetic diversity
believe that higher organisms including man, mouse, Drosphila and the horseshoe crab all have population sizes within a factor 4 of each other Later work
The_paradox_of_variation
Extinct family of chelicerates
America. The overall appearance is similar to other synziphosurines and horseshoe crabs, featuring a dome-shaped prosomal (head) shield and an opisthosoma
Offacolidae
Species of bird
eats small crabs and other small invertebrates. In spring, birds migrating north from South America consume large numbers of horseshoe crab eggs in the
Sanderling
Index of articles associated with the same name
unrelated groups of animals: Trilobites, extinct arthropods Xiphosura (horseshoe crabs), including living and fossil species Platerodrilus or trilobite beetles
Trilobite_larva
Many-legged arthropods with elongated bodies
Arthropoda Chelicerata inc. horseshoe crabs and spiders Mandibulata Myriapoda Chilopoda millipedes and allies Pancrustacea inc. crustaceans and insects
Centipede
Fossilised last steps of a living creature
sometimes preserved as fossil footprints. In 2002 the mortichnia of a horseshoe crab was found in lithographic limestone in Bavaria, Germany. The trail measured
Mortichnia
Extinct genus of arthropods
character 鲎 (hòu), meaning "horseshoe crab". Houia yueya was originally described as a species of the xiphosuran (horseshoe crab) genus Kasibelinurus (Kasibelinurus
Houia
Protein family
serine proteinase cascade. It has been most extensively studied in horseshoe crabs. It has also been produced by other organisms, such as Bacillus coagulans
Coagulin
Class of crustaceans
discovered in 1955 by Howard L. Sanders, and are commonly referred to as horseshoe shrimp. They have been grouped together with the Remipedia in the Xenocarida
Cephalocarida
Genus of horseshoe crab relatives
Victalimulus mcqueeni is an extinct horseshoe crab, from Early Cretaceous (Aptian) Koonwarra Fossil Beds in eastern Victoria, Australia. The holotype and
Victalimulus
Removal of pyrogens from solutions
Bang's observation that horseshoe crab blood forms clots when exposed to endotoxins. Amoebocyte extract from horseshoe crab blood is mixed with a sample
Depyrogenation
Populous island in southeastern New York city
Many speculate the story is meant to draw attention to New York State horseshoe crab conservation issues. The New York Mets of Major League Baseball play
Long_Island
Group of arthropods
paraphyletic group of chelicerate arthropods previously thought to be basal horseshoe crabs (Xiphosura). It was later identified as a grade composed of various
Synziphosurina
Clade of arthropods
Prosomapoda is a clade of euchelicerates including the groups Xiphosura (horseshoe crabs) and Planaterga (a group comprising bunodids, pseudoniscids, chasmataspidids
Prosomapoda
Posterior body part of some arthropods
is a distinctive feature of the subphylum Chelicerata (arachnids, horseshoe crabs and others). It is similar in most respects to an abdomen (and is often
Opisthosoma
Extinct family of arthropods
xiphosurans, including large elongated genal spines. Unlike living horseshoe crabs (Limulidae), austrolimulids were likely adapted for freshwater and
Austrolimulidae
Order of arthropods
the order Chasmataspidida. Chasmataspidids are probably related to horseshoe crabs (Xiphosura) and/or sea scorpions (Eurypterida), while more recent studies
Chasmataspidida
Extinct genus of horseshoe crab
Attenborolimulus is an extinct genus of austrolimulid horseshoe crab with one known species: Attenborolimulus superspinosus. This genus is known from the
Attenborolimulus
Unincorporated community in Delaware, United States
southeast of Dover. The beach itself is an established horseshoe crab sanctuary, with the crabs spawning there in early summer. "Pickering Beach". Geographic
Pickering_Beach,_Delaware
Tachyplesin is an antimicrobial peptide isolated from the horseshoe crab with a molecular weight of 2.36 kDa and the amino acid sequence KWCFRVCYRGICYRRCR
Tachyplesin
Medical researcher
bacterial endotoxins using horseshoe crab blood, which is blue. Based upon their observations, they found that horseshoe crab blood clots in the presence
Fred_Bang
Pseudoscience and subculture that studies creatures
nightcrawler, the skunk ape, the Burrunjor, the Great South Bay Giant Horseshoe Crab, the Inkanyamba, the Kasai Rex, the Ningen, and many more. List of cryptids
Cryptozoology
Extinct genus of horseshoe crabs
Vaderlimulus is a genus of horseshoe crab. The species V. tricki lived in the Olenekian age Triassic period approximately 245 million years ago North America
Vaderlimulus
Predatory order of arachnids
Chelicerata, a subphylum of Arthropoda that contains sea spiders and horseshoe crabs, alongside terrestrial animals without book lungs such as ticks and
Scorpion
State in Eastern India
spotted owlets and white-bellied sea-eagles. The possibly endangered horseshoe crab is also found in this region. Chilika Lake is a brackish water lagoon
Odisha
interpreted as evidence of predation of horseshoe crabs on polychaetes. Traces likely produced by large-bodied horseshoe crabs are reported from the Lower Triassic
2026 in arthropod paleontology
2026_in_arthropod_paleontology
Egg masses of fish and seafood
Kendal, telur ikan mimi has become a Ramadan dish. It is made from horseshoe crab roe with grated coconut. In the Caspian provinces of Gilan and Mazandaran
Roe
Extinct genus of Cambrian Arthropod
suggest it is a basal member of Chelicerata, a group which includes horseshoe crabs and arachnids. Reconstruction of Mollisonia plenovenatrix in lateral
Mollisonia
Organism resembling a form long shown in the fossil records
2015-12-03. Kin, Adrian; Błażejowski, Błażej (2 October 2014). "The Horseshoe Crab of the Genus Limulus: Living Fossil or Stabilomorph?". PLOS ONE. 9 (10)
Living_fossil
2021 American film
directorial debut of Berolzheimer. Following a nuclear accident, a group of horseshoe crabs is transformed into deadly creatures. They invade a tranquil coastal
Crabs!
Order of arachnids
relatives may be camel spiders (Solifugae) or a larger clade comprising horseshoe crabs, Ricinulei, and Arachnopulmonata (scorpions, pseudoscorpions, and Tetrapulmonata)
Opiliones
Small eight-legged arthropod
scorpions) Solifugae (camel spiders) Acariformes Parasitiformes Xiphosura (horseshoe crabs) Ricinulei Arachnopulmonata Panscorpiones Pseudoscorpiones (pseudoscorpions)
Mite
American Contemporary artist
exhibition HorseshoeCrabs HorseshoeCrabs at the Freddy Gallery, Baltimore displayed various artistic interpretations of the horseshoe crab, an arthropod
Puppies_Puppies
Species of small freshwater animal
freshwater crustacean of the order Notostraca, resembling a miniature horseshoe crab. It is characterized by an elongated, segmented body, a flattened shield-like
Triops_longicaudatus
Extinct Devonian genus of Eurypterida
(also 1-2 μm) but they match those of modern horseshoe crabs in size. The unique eyes of modern horseshoe crabs are highly distinct from eyes of other modern
Jaekelopterus
Genus of horseshoe crab relatives
Euproops is an extinct genus of xiphosuran, related to the modern horseshoe crab. It lived during the Carboniferous Period. The Treatise on Invertebrate
Euproops
substrates This enzyme is isolated from the hemocyte granules of the horseshoe crabs Limulus and Tachypleus, where it serves as a LPS endotoxin-sensitive
Limulus_clotting_factor_C
Song by Hop Along
"Horseshoe Crabs" is a song by American indie rock band Hop Along. It appears as the third track on their third album Painted Shut. Pitchfork cited the
Horseshoe_Crabs
English broadcaster and natural historian (born 1926)
up of the seasonal natural habitats. In 2021, an extinct species of horseshoe crab was named Attenborolimulus superspinosus. In July 2022, a fossil of
David_Attenborough
Class of extinct, Paleozoic arthropods
scholars consider them closely related to chelicerates (which include horseshoe crabs, sea spiders, and arachnids) as part of a clade called Arachnomorpha
Trilobite
Trace fossil
Chirotherium trackways were found alongside those of early horseshoe crabs. The horseshoe crabs were likely breeding along the intertidal zone while the
Chirotherium
Third and final series of the Permian
Changhsingian Woodwardopterus? freemanorum of Australia. A member of the extant horseshoe crab family, Limulidae; Guangyuanolimulus appears at the end of the period
Lopingian
Genus of horseshoe crab relatives
Xaniopyramis is an extinct genus of xiphosuran, related to the modern horseshoe crab. It lived in the early Carboniferous. Xaniopyramis linseyi Siveter and
Xaniopyramis
Coastline in Nova Scotia, Canada
woodae, an extinct horseshoe crab. Contrary to some erroneous reports in the popular press, it is not the world's oldest horseshoe crab (Order Xiphosurida)
Blue_Beach
Extinct order of Cambrian arthropods
Kiisortoqia Bushizheia Megacheira Habeliida Mollisonia Chelicerata (horseshoe crabs, sea spiders, arachnids, etc) "Great appendage bivalved forms" (Occacaris
Habeliida
Anatomical feature of appendages of some arthropods for processing food items
Gnathobases are present in extant and extinct arthropods, though only horseshoe crabs today have a well developed series of gnathobases along their limbs
Gnathobase
Process of formation of blood clots
blood coagulation is the horseshoe crab. Exemplifying the close links between coagulation and inflammation, the horseshoe crab has a primitive response
Coagulation
Order of two-pronged bristletails
Ecdysozoa Chelicerata Pycnogonida (sea spiders) Euchelicerata Xiphosura (horseshoe crabs) Arachnida (spiders, scorpions, ticks, mites) Mandibulata Myriapoda
Diplura
Extinct genus of chelicerate
S2CID 89604861. Lamsdell, James C. (2013). "Revised systematics of Palaeozoic 'horseshoe crabs' and the myth of monophyletic Xiphosura". Zoological Journal of the
Bembicosoma
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