- Animal Diversity Web Class Merostomata (Horseshoe Crabs)
- Contains basic facts and taxonomic profile on this animal group. With pictures and specimens.
- Assateague Naturalist The Horseshoe Crabs
- Discusses the phylogeny, diet and breeding behavior of this animal. With photos.
- Canada's Marine Invertebrates Merostomata
- Discusses morphology, reproduction, metabolism, ecology and endemic features. With photos.
- Class Merostomata (The Horseshoe Crabs)
- Provides information on major attributes, characteristics and endemic features of this animal class.
- Class Merostomata King Crab or Horseshoe Crabs
- Contains information on basic features and evolutional history of this species. With photos.
- Digital Zoology Chelicerata Merostomata
- Contains labeled images of this animal. With brief videos.
- Eurypterida "Sea scorpions"
- Provides information on body size, habitation, and fossil records of this species. With photos.
- Eurypterus lacustris (Merostomata)
- Contains data on fossil specimen of this specie. With pricing information.
- Excite Directory Merostomata
- Lists online references on this species.
- Horseshoe Crab
- Contains information on the biology, life stages, reproduction and current status of this animal class.
- Horseshoe Crabs (Class Merostomata)
- Contains information on habitation, breeding behavior, body plan, and respiration of this animal species. With labeled illustrations.
- Horseshoe Crabs Subclass Xiphosura
- Contains introductory information on this species. From A Guide to Seashore Life in Singapore.
- http://www.ucmp.berkeley.edu/arthropoda/chelicerata/xiphosura.html
- Discusses basic features, diversity and evolution of these animals. With photos.
- Humble Horseshoe Crab
- Contains information on characteristics, medicinal uses and conservation issues of this animal.
- Invertebrata Phylum Chelicerata Class Merostomata Horseshoe Crabs
- Contains information on characteristics, phylogeny, natural value, and threats to its existence. With photos.
- ITIS Report: Merostomata
- Gives taxonomy, hierarchy, status, resources, and references related to this class of horseshoe crabs.
- Life History Species of Limulus
- Provides information on taxonomic classification, ecology and morphology. With references.
- Long Island Seashore Creatures Horseshoe Crab
- Provides introductory information of this organism. With photos.
- Phylum Arthropoda Class Merostomata
- Provides information on body structure, covering, diet, habitation, respiration, reproduction and behavior of this species. With photos.
- Suite101.com Horseshoe Crabs
- Contains an article by Beverly Eschberger. With photos.
- Systematics of Cheliceramorpha
- Provides information on classification, taxonomy and phylogeny of this animal group. With sources.
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