It consists of the fused ganglia of the acron and one or two of the foremost segments that form the head a total of three pairs of ganglia in most arthropods, but only two in chelicerates, which do not have antennae or the ganglion connected to them.
42.
Although there is considerable agreement about the relationships between most chelicerate sub-groups, the inclusion of the Pycnogonida in this taxon has recently been questioned ( see below ), and the exact position of scorpions is still controversial, though they were long considered the most primitive ( basal ) of the arachnids.
43.
:: : One such case is in a Post mortem report ( video ) : Misadventurous ingestion of Musca domestica by geriatric female was initially treated by a chelicerate arthropod taken orally, with consequent evolution of treatments until equine injestion and consequent termination . talk ) 15 : 21, 2 May 2010 ( UTC)
