Scorpiones

From Palaeos.org

Jump to: navigation, search
(revised dendrogram)
(description: starting)
Line 1: Line 1:
-
[[Arachnida|<==]]Scorpiones [Scorpiniata]
+
[[Arachnida|<==]]Scorpiones [Scorpiniata]
     |  ''i. s.'': ''Belisarius xambeui'' Simon 1879
     |  ''i. s.'': ''Belisarius xambeui'' Simon 1879
     |        ''Euscorpius'' [Euscorpiidae]
     |        ''Euscorpius'' [Euscorpiidae]
Line 39: Line 39:
<nowiki>*</nowiki> Type species of generic name indicated
<nowiki>*</nowiki> Type species of generic name indicated
 +
==Description==
 +
These are the scorpions, carnivorous arachnids that have their pedipalps modified into powerful, claw-like pincers.  All scorpions have the last six segments of their bodies, the metasoma, modified into a tail that bears the telson (the segment placed on the sixth segment), which has been modified into a venom-injecting organ used for subduing prey and potential predators.
 +
 +
Scorpions have an extensive, albeit notoriously patchy fossil record extending all the way back to the [[Silurian]], where they began as a group of small, eurypterid-like creatures.  They made the transition from marine to terrestrial environments some time between the late Silurian and early Devonian.  All of the marine scorpions would eventually die out during the Devonian due to either climatic changes, or competition and or predation from various predatory [[gnathostome]] [[vertebrates]] and the larger, fiercer [[eurypterid]]s.
== References ==
== References ==

Revision as of 19:53, 27 July 2008

Personal tools