Devonian terrestrial arthropods from Gondwana

Article Abstract:

The fossil record for the diverse terrestrial animal group, Atelocerata, is incomplete. Various arthropods were present on land in Australia in the Silurian Period, but definite terrestrial arthropods in mid-Palaeozoic stages of the southern continents have not been discovered. The first atelocerates from the Devonian stages of Gondwana are described, comprising two myriapod species of the Maldybulakia genus. This adds to the knowledge of the anatomy of the arthropod.

Fossils, Paleobotany, Devonian period, Arthropoda, Fossil, Fossil arthropods, Myriapods

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Neuroanatomy of sea spiders implies an appendicular origin of the protocerebral segment

Article Abstract:

The developmental neuroanatomy of a putative basal arthropod, the pycnogonid sea spider, is investigated with immunohistochemical techniques. It is shown that the first pair of appendages, the chelifores, are innervated at an anterior position on the protocerebrum and hence the pycnogonid chelifores are not positionally homologous to appendages of extant arthropods, but might be homologous to the great appendages of certain Cambrian stem-group arthropods.

United States, Science & research, Physiological aspects, Arthropoda, Arthropods, Sea spiders

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