Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987 Author Tolokonnikova, Zoya A. Department of science and research, Kuban State University, Stavropol’skaya Str., 149, Krasnodar, 350040, Russia. & Kazan Federal University, Kremlevskaya Str., 18, Kazan, 420008, Russia. Author Fedorov, Petr V. Saint Petersburg State University, Universitetskaya nab. 7 - 9, St. Petersburg, 199034, Russia. text Zootaxa 2023 2023-05-11 5284 2 337 350 http://dx.doi.org/10.11646/zootaxa.5284.2.6 journal article 54233 10.11646/zootaxa.5284.2.6 f7aad5f0-4794-421b-ad9f-56995d3edd73 1175-5326 7923480 13AEE833-9E23-4140-8602-11643C5E1300

TABLE 2. Classification of protective structures in the Khrevitsa bryozoan association based on functional criteria.

Functional group (means)	Structure	Genera	Comments
Strengthening the	Mesozooecia	Hallopora
colony, addition in feeding area by increasing the distance between the autozooecia apertures		Homotrypa Amplexopora Stigmatella	Sometimes clustering maculae
		Diplotrypa	Abundant, few types
		Mesotrypa
		Prasopora	Abundant, sometimes clustering maculae
	Tektitozooecia	Nematotrypa	Abundant
	Exilazooecia	Monotrypa	Rare
Defense against predators	Acanthostyles	Amplexopora	Two types
		Homotrypa	Abundant
		Prasopora	Rare
		Mesotrypa
		Stigmatella
		Nematotrypa
		Diplotrypa	Rare
	Paurostyles	Nematotrypa
		Prophillodictya
Protection of polypide, attachment for muscles	Diaphragms	Monotrypa Diplotrypa	Rare
		Stigmatella
		Mesotrypa
		Hallopora
	Hemiphragms	Nematotrypa
	Diaphragms, cystiphragms, both	Amplexopora Homotrypa
		Prasopora