Along came a sea spider

Article Abstract:

Investigations of brain development in sea spiders have provoked controversy as it provides hints about how the earliest arthropod head evolved. The work presented by Maxmen and group has suggested that pycnogonid chelifores and spider chelicerae develop from different regions of the head and hence cannot be equivalent, thereby overturning the entrenched ideas about the body plan of sea spiders.

Physiological aspects, Brain research, Sea spiders

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Affinity for arrow worms

Article Abstract:

New molecular studies throw light on the true evolutionary position of the arrow worms in the animal family tree. It is concluded that on an evolutionary tree, arrow worms form a long branch and such a long branch species are notoriously problematic and this could be the reason why placing of arrow worms within the animal kingdom is difficult.

Chaetognatha, Arrowworms

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Lost children of the Cambrian

Article Abstract:

The initial flowering of animal life on Earth occurred during the Cambrian period. Evidence from fossil embryos from the past provides clues about the origins of the major animal groups.

Origin, Animals

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