Diversity of marine bryozoans inhabiting demosponges in northeastern Brazil Author Almeida, Ana C. S. Author Souza, Facelucia B. C. Author Menegola, Carla Author Vieira, Leandro M. text Zootaxa 2017 4290 2 281 323 journal article 32714 10.11646/zootaxa.4290.2.3 eeec8306-8c71-4db6-834a-c70396d43a82 1175-5326 892719 0AE2706B-F77D-4903-B3A6-BB11891CD67B Triphyllozoon arcuatum ( MacGillivray, 1889 ) ( Figs. 81–83 ) Retepora monilifera form arcuata MacGillivray, 1889 : 29 . Triphyllozoon arcuatum : Almeida et al. , 2015a : 2 , figs. 2–17 (cum syn.). Material examined. UFBA 1612 , UFBA 2399 , Camamu Bay , 13°53’S , 38°59’W , 18–20 m , coll. October 2012 (on sponge Tedania ignis ). Remarks. Triphyllozoon arcuatum has erect robust, thickly calcified, lace-like colonies ( Fig. 81 ), autozooids with low peristome and peristomial avicularia, frontal avicularia either small and round and/or large and oval ( Fig. 82 ), large columnar avicularia, and a globose ovicell with sutures varying from arcuate to trifoliate with a short distal limb ( Fig. 83 ) ( Almeida et al. 2015a ). Triphyllozoon arcuatum was recently recorded in the Western Atlantic for the first time, being recognized as a non-indigenous species to the area ( Almeida et al. 2015a ). Specimens of T. arcuatum here examined were found associated with the rugose-textured sponges Tedania ignis ( Fig. 12 ). Triphyllozoon species are frequently found associated with other invertebrates, including the demosponges Tedania ignis and Dysidea etheria , and the calcareous sponge Clathrina sp. in Bahia State (for more information see Almeida et al. 2015a ). Distribution. Indo-Pacific: South Australia , Northern Territory and Singapore . ( Hayward 1999 ; Tilbrook & Gordon 2015 ). Atlantic: Brazil ( Pernambuco and Bahia ) ( Almeida et al. 2015a ).