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 ?
A constant molt increment as an approximation for horseshoe crab growth for ages >2 is biologically feasible (Sekiguchi et al.
persistence are the decline of horseshoe crab egg densities below levels
Previous studies of horseshoe crabs in Malaysia have indicated that their population is in decline, but few studies have assessed the population in Sabah.
Horseshoe crab populations tend to remain local, with little influx from other bays.
Knobbed Channeled whelk whelk Horseshoe crab (Limulus polyphemus) eggs extracted with FSW X X Hard clam (Mercenaria rnercenaria) tissue X Horseshoe crab hemolymph X X Horseshoe crab eggs extracted with 50 mM Tris X buffer solution, <30 kDa and >30 kDa molecular weight fractions of horseshoe crab eggs produced by ultrafiltration, and the molecular weight fractions recombined
Some "crabs," like hermit and horseshoe crabs, aren't true crabs at all.
Each female horseshoe crab lays many thousands of eggs.
Since this was the Horseshoe Crab Trail, in Cockroach Bay, I had expected large numbers of horseshoe crabs as well, but I guess it wasn't the season; there were only a few.
The American horseshoe crab (Limulus polyphemus), having persisted largely unaltered for millions of years, is now central to a modern management debate of conflicting interests by commercial watermen, birdwatchers, biopharmaceutical companies, and eco-tourists (Odell et al.
A trackway of a horseshoe crab was found in the Bloomsburg Red Beds at Buttermilk Falls in the Delaware Water Gap National Recreation Area of northwestern New Jersey (41[degrees]08'05" latitude, 74[degrees]53'11" longitude, Fig.
Murphy Prosomal-width-to-weight relationships in American horseshoe crabs (Limulus polyphemus): examining conversion factors used to estimate landings
Here, hundreds of horseshoe crab shells littered the pale sand.