Results 131 to 140 of about 468 (168)

Synziphosurines (Xiphosura: Chelicerata) from the Silurian of Iowa

, 2010
Shultz, J.W, Briggs, D.E.G, Braddy, SJ, Moore, R. A.   +3 more
core  

Opisthosomal fusion and phylogeny of Palaeozoic Xiphosura

Lethaia, 1997
Fusion of opisthosomal tergites to form a thoracetron has previously been considered a characteristic of the xiphosuran superfamilies Euproopoidea Eller, 1938, and Limuloidea Zittel, 1885. Evidence is presented here that fusion also occurs in Bellinuroidea Zittel & Eastman, 1913.
Lyall I Anderson, Paul A Selden
exaly   +3 more sources

EXAMINING EVOLUTIONARY RATE IN XIPHOSURA THROUGH TIME

Geological Society of America Abstracts with Programs, 2020
Samantha B. Ocon, James C. Lamsdell
exaly   +3 more sources

Xiphosura

, 2015
AbstractXiphosura are an early branching sister taxa to Arachnida, which together comprise the group Euchelicerata. Because they appear to have retained many plesiomorphic features, xiphosurans are seen as a proxy of the (Eu)chelicerate ancestor. Xiphosurans probably acquired many new characteristics during the course of their evolution; nevertheless ...
Barbara A. Battelle, Andy Sombke, Steffen Harzsch   +2 more
openaire   +2 more sources

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An “ancient” complexity? Evolutionary morphology of the circulatory system in Xiphosura

Zoology, 2015
Horseshoe crabs (Xiphosura) have been an object of zoological research for almost 200 years. Although some morphological work on the circulatory system has been done, the three-dimensional structure of this complex organ system has never been shown satisfactorily and some crucial questions remain unanswered.
Torben Gopel, Christian S Wirkner
exaly   +3 more sources

COMPARATIVE EVOLUTIONARY TRENDS IN XIPHOSURA

Geological Society of America Abstracts with Programs, 2023
James C Lamsdell
exaly   +2 more sources

Examining Evolutionary Rate in Xiphosura

, 2022
Horseshoe crabs, a group of aquatic chelicerate arthropods of the class Xiphosura, are strongly linked with the concept of “living fossils” – a term colloquially used to refer to clades that display a consistently low rate of morphological evolution ...
Ocon, Samantha B
openaire   +3 more sources

MEASURING MORPHOLOGICAL CHANGE: EVOLUTIONARY RATE OF DISCRETE CHARACTERS IN XIPHOSURA

Geological Society of America Abstracts with Programs, 2022
Samantha Ocon, James Lamsdell
exaly   +2 more sources

Xiphosura — Arachnida

, 2000
Peter Ax
openaire   +2 more sources