Table 1 Nerve elements of the lophophore and tentacles in phoronids and bryozoans (see Fig. 8).

From: Innervation of the lophophore suggests that the phoronid Phoronis ovalis is a link between phoronids and bryozoans

Nerve elements of the lophophore and tentacles Phoronida adults22,23,24,26 Phoronida juveniles20,21 Phoronis ovalis adults Bryozoa6,17,31,32,33,34,35,36,37,38,39
Presence of the nerve centre on the dorsal side оf the body + + + +
Presence of the nerve centre on the oral side of the epistome +
Nerve alоng the frontal side of tentacles (inner nerve of the lophophore) +inner nerve ring +inner nerve ring +circumoral nerve ring
Intensity (thickness) of the inner nerve of the lophophore thin thick thick
Nerve alоng the abfrontal side of tentacles (outer nerve of the lophophore) +tentacular nerve ring +tentacular nerve ring +tentacular nerve ring +in some ctenostomes (outer nerve) — in most of bryozoans
Innervation оf frontal side of tentacles ? from inner nerve from inner nerve from inner nerve
Innervation оf laterofrontal sides of tentacles from outer nerve ? from inner nerve from inner nerve
Presence оf T-like (inter-tentacular) neurite bundles ? + + +
Presence of inter-tentacular 5ht-lir perikarya ? + +
  1. “+” Indicates presence; “−” indicates absence; “?” indicates that information is lacking.