Characteristics
borings  kidney-shaped S-shaped
budding  continuous budding of autozooids autozooids budding from kenozooidal stolon
colony  an encrusting, continuous sheet encrusting, uniserial erect, not rubbery erect, rubbery, brown, often washed ashore
colony can be pealed off  easily rather not
color  grey translucent brown white translucent with white borders yellow
filaments on frontal surface  absent present
kenozooids other than stolons  absent minute spherical, around the orifice as brown, corneous spines around the orifice a spherical pair proximo-lateral to orifice
number of tentacles  8 9 10 11 12 13 14 15 16 17 18 19 20 21 > 21
orifice  on a prominent cilindrical peristome not so bilabiate
reproduction  ITO sometimes present embryos in clusters of 3 or 4 in the zooids, never ITO embryos in clusters of 6 or 7 in the zooids, never ITO embryos sometimes present but number not important, never ITO embryo single, yellow embryo single, pink
substrate preferences  hydrozoid stems and erect Bryozoa seaweed hard substrates as stones, shells on several substrates boring in worm tubes boring in shells decapoda
zooids along the stolon  in a straight row in a spiral arrangement | Remaining taxa: Alcyonidium condylocinereum Porter, 2004
Alcyonidium diaphanum (Hudson, 1778)
Alcyonidium gelatinosum (Linnaeus, 1761)
Alcyonidium hirsutum (Fleming, 1828)
Alcyonidium hydrocoalitum Porter, 2004
Alcyonidium mamillatum Alder, 1857
Alcyonidium mytili Dalyell, 1848
Alcyonidium parasiticum (Fleming, 1828)
Alcyonidium polyoum (Hassall, 1841)
Amathia lendigera (Linnaeus, 1758)
Anguinella palmata Van Beneden, 1845
Arachnidium lacourti d'Hondt & Faasse, 2006
Bowerbankia citrina (Hincks, 1877)
Bowerbankia gracilis Leidy, 1855
Bowerbankia imbricata (Adams, 1798)
Buskia nitens Alder, 1857
Farrella repens (Farre, 1837)
Flustrellidra hispida (Fabricius, 1780)
Hypophorella expansa Ehlers, 1876
Panolicella nutans Jebram, 1985
Penetrantia concharum Silén, 1946
Vesicularia spinosa (Linnaeus, 1758)
Walkeria uva (Linnaeus, 1758)
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