
1) Arthropod genus 2) Genus limulus
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https://www.crosswordclues.com/clue/limulus

Limulus is a genus of horseshoe crab, with one extant species, the Atlantic horseshoe crab L. polyphemus. Many fossil species are known, many of which have since been assigned to other genera. Currently valid fossil species include: Tentative species: ...
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http://en.wikipedia.org/wiki/Limulus

• (n.) The only existing genus of Merostomata. It includes only a few species from the East Indies, and one (Limulus polyphemus) from the Atlantic coast of North America. Called also Molucca crab, king crab, horseshoe crab, and horsefoot.
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http://thinkexist.com/dictionary/meaning/limulus/

(from the article `skeleton`) ...rather, they grow with the body. A massive and compact endosternite (internal sternite), formed by connective-tissue fibres, frequently lies below ... Among the chelicerate (possessing fanglike front appendages) arthropods (for example, scorpions, spiders, ticks, and mites), the horseshoe crab, ... .....
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http://www.britannica.com/eb/a-z/l/52

<zoology> The only existing genus of Merostomata. It includes only a few species from the East Indies, and one (Limulus polyphemus) from the Atlantic coast of North America. ... Synonym: Molucca crab, king crab, horseshoe crab, and horsefoot. ... (04 Mar 1998) ...
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http://www.encyclo.co.uk/local/20973
Lim'u·lus (lĭm'u*lŭs)
noun ;
plural Limuli (- lī). [ Latin , dim. of
limus sidelong, askance.]
(Zoology) The only existing genus of Merostomata. It includes only a few species from the East Indies, and one (
Limulus polyphemus ) from the At...
Found on
http://www.encyclo.co.uk/webster/L/44

[
n] - type genus of the family Limulidae
Found on
http://www.webdictionary.co.uk/definition.php?query=Limulus
genus Limulus noun type genus of the family Limulidae
Found on
https://www.encyclo.co.uk/local/20974
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