in invertebrate conservation: priorities, practice and prospects.
In most phyla, although simple photoreception is almost universally present, no eyes evolved, but eyes evolved later in Annelida, Mollusca, Onychophora
, and Chordata.
Ancient lobopods and their modern counter-parts, in the phylum Onychophora
, intrigue scientists because they may represent a link between two extremely successful phyla, Annelida (segmented worms) and Arthropoda.
The African distribution of peripatopsid Onychophora
is similarly confined to this region, and they are also absent from India-Madagascar and south-east Asia, but unlike rhytidids and sphaerotheriids, the peripatopsids also occur in South America.
Using the new, as-yet-unnamed Chinese fossil as a guidepost, two researchers now suggest that some of the most enigmatic of these animals belong to the phylum Onychophora
, which in the modern world includes the velvet worms of the tropics.