Monoamines and neuropeptides in Bryozoa: localisation and possible functions

Abstract

Recently many data on distribution of common neuromediators in different bryozoan species were published. Based on the three species of freshwater bryozoans, we compare our results with those from other studies in attempt to understand possible role of each neuromediator (serotonin, FMRFamide, catecholamine) in the nervous system of Bryozoa. Serotonin appears to be responsible for feeding behavior and digestion, FMRFamide mainly participate in the muscles innervation and catecholaminergic cells could be mechanoreceptors.

First record of the freshwater bryozoan Pectinatella magnifica in north-west Russia with a description of sensory structures

“…Riisgård, Manríques, 1997;Shunatova, Ostrovsky, 2001Riisgård et al, 2010) triggered the renewed interest to the studies of the nervous system and sensory structures (e.g. Schwaha, Wanninger, 2012;Temereva, Kosevich, 2016Shunkina et al, 2015;Shunkina, Zaitseva, 2017;Worsaae et al, 2019, reviewed in Schwaha et al 2020. Although first observations of putative sensory structures on bryozoan tentacles go back to the first half of the XIX century (Lister, 1834), and this work was continued after invention of the histological staining technique (e.g.…”

“…Invention of the scanning and transmission electron microscopy (SEM and TEM elsewhere in the text) and modern staining techniques (among them glyoxylic acidinduced fluorescence) greatly added to our understanding of the bryozoan sensory structures (e.g. Gilmour, 1978;Nielsen, Riisgård, 1998;Shunatova, Nielsen, 2002;Riisgård et al, 2004Riisgård et al, , 2010Shunkina et al, 2014a;Shunkina, Zaitseva, 2017;Tamberg, Shunatova, 2017). Currently, ciliary cells with presumed sensory function are known on the tentacles and the introvert (eversible part of the body wall) in both marine and freshwater bryozoans.…”