The Horseshoe Crab of the Genus Limulus: Living Fossil or Stabilomorph?
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چکیده
منابع مشابه
The Horseshoe Crab of the Genus Limulus: Living Fossil or Stabilomorph?
A new horseshoe crab species, Limulus darwini, is described from the uppermost Jurassic (ca. 148 Ma) near-shore sediments of the Kcynia Formation, central Poland. The only extant species Limulus polyphemus (Linnaeus) inhabits brackish-marine, shallow water environments of the east coast of the United States. Here it is shown that there are no important morphological differences between the Kcyn...
متن کاملSediment microbiomes associated with critical habitat of the Juvenile American Horseshoe Crab; Limulus polyphemus
Plumb Beach, Brooklyn, New York in USA is an important horseshoe crab breeding and nursery ground that has experienced substantial anthropogenic influence, including pollution, erosion and subsequent restoration. Since little is known about the relationship between sediment microbial communities and juvenile horseshoe crab survival, next generation sequencing was used to characterize and compar...
متن کاملCyclic GMP in lateral eyes of the horseshoe crab Limulus
In Limulus photoreceptors, light induces a depolarization. The gating mechanism of the cation channels involved is not understood but evidence exists that cyclic nucleotides may act as ligands. Using an antiserum against a cGMP-protein conjugate, we found strong immunoreactivity localized to the light-sensitive rhabdoms of lateral eye photoreceptors. In homogenated tissue, the cGMP concentratio...
متن کاملCardiac Muscle of the Horseshoe Crab, Limulus Polyphemus
The fine structure of the cardiac muscle of the horseshoe crab, Limulus polyphemus, has been studied with respect to the organization of its contractile material, and the structure of its organelles and the cell junctions. Longitudinal sections show long sarcomeres (5.37 micro at L(max)), wide A bands (2.7 micro), irregular Z lines, no M line, and no apparent H zone. Transverse sections through...
متن کاملDevelopmental ecology of the American horseshoe crab Limulus polyphemus
During spawning events, horseshoe crab eggs are released from the female’s oviducts, and fertilized by one or more males. Eggs are shaped by the female into discrete clutches deposited in nests at depths of 10−20 cm on intertidal estuarine beaches. Distinguishing between fresh eggs and the early developmental stages is obfuscated by the large amount of dense, opaque yolk. The first unambiguous ...
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ژورنال
عنوان ژورنال: PLoS ONE
سال: 2014
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0108036