horseshoe crab


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horseshoe crab

(hŏrs′shoo″, hŏrsh′oo krăb)
Limulus polyphemus, a species of saltwater arthropod that is a member of the Chelicerates, the subphylum containing scorpions and spiders, rather than the Crustaceans, the subphylum containing true crabs. The Limulus body structure has remained nearly unchanged for 450 million years, longer than almost any other living animal. Its blood is blue rather than red because oxygen is carried by a copper-based compound rather than hemoglobin, which is an iron-based compound; Limulus blood is used in testing drugs for bacterial contamination.
References in periodicals archive ?
The arthrodial membrane between the prosoma and the opisthosoma of each horseshoe crab was exposed, and the hinge joint was sterilized with 70% ethanol.
Methods of recording mortality, measuring wet body weight, testing and calculating feeds, and analyzing horseshoe crab chemical composition followed the same procedures described by Hu et al.
Smith, "Influence of waves and horseshoe crab spawning on beach morphology and sediment grain-size characteristics on a sandy estuarine beach," Sedimentology, vol.
Fortunately, there are programs that are preventing future destruction of horseshoe crab habitat and spawning sites.
Horseshoe crab populations tend to remain local, with little influx from other bays.
The company, EndoSafe was set up to market technology based on limulus amebocyte lysate (LAL), a key ingredient in the horseshoe crab's blood, which reacts in the presence of gram-negative bacteria.
Chitosan prepared from chitin of the horseshoe crab shells can be used to improve the strength properties of paper made from unbleached pulp obtained from oil palm stem.
Female horseshoe crabs can lay 4,000 eggs in each clutch.
The chitinous peaks of a horseshoe crab's shell are 'rather like the perky eyebrows I associate with clerics of a certain age'; seaweed 'swirls like a saucy Spanish skirt.'" CHLOE SCHAMA
The man didn't know the difference between a whelk shell and a clamshell, and he couldn't tell a horseshoe crab from a fiddler crab.
horseshoe crab eggs, at its main stopover site at Delaware Bay; a