horseshoe crab

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Related to Limulus polyphemus: Horseshoe crabs

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 ?
MET and gold-labeling of LPS using a lectin of Limulus polyphemus. (a) Bacterial structure with positive labeling on the outer membrane (thin arrow).
Chabot, "Rhythms of locomotion expressed by Limulus polyphemus, the American horseshoe crab: II.
Genetic variation and geographic differentiation in mitochondrial DNA of the horseshoe crab, Limulus polyphemus. Genetics 112(3):613-627.
Transcripts encoding Limulus polyphemus opsins 1 and 2 (LpOps1 and LpOps2) were identified in cDNA libraries of LE and ME, respectively, using classical homology cloning approaches (Smith et al., 1993); and two additional LpOps1-like genes (LpOps3 and LpOps4) were identified through polymerase chain reaction (PCR) and Sanger sequencing of Limulus genomic DNA (Dalai et al., 2003).
The table should read as follows: Table 3 The number of individuals sampled (n), coefficient values (a, [log.sub.e](b)), standard errors for values (SE[a], SE[[log.sub.e](b)]), and correlation coefficient ([r.sub.2]) of the relationship between prosomal width and weight for horseshoe crabs (Limulus polyphemus), loge(Wt)=[log.sub.e] (PW) x a + [log.sub.e](b).
The American horseshoe crab (Limulus polyphemus) is a unique and fascinating living fossil, a source of food for migrating shorebirds, a source of a highly sensitive assay for bacterial endotoxin, and a commercially harvested whelk (Busycon carica and Busycotypus canaliculatus) and eel (Anquilla rostrata) bait (Novitsky 1984, Walls et al.
3:00 BIOCHEMICAL ANALYSIS OF DEVELOPING EGGS OF THE AMERICAN HORSESHOE CRAB LIMULUS POLYPHEMUS FROM DELAWARE BAY AND THE GULF OF MEXICO
In chelicerates, Pax-6 ortholog expression has not been found in the developing eyes of the horseshoe crab Limulus polyphemus (Linnaeus, 1758) (Blackburn et al., 2008), despite its presence in their lateral sense organ (the function of which remains unclear).
Abstract--Horseshoe crabs (Limulus polyphemus) are valued by many stakeholders, including the commercial fishing industry, biomedical companies, and environmental interest groups.