An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana Author Galea, Horia R. Hydrozoan Research Laboratory, 405 Chemin Les Gatiers, 83170 Tourves, France. Author Di Camillo, Cristina G. 0000-0002-4031-8158 Università Politecnica delle Marche, Dipartimento di Scienze della Vita et dell’ Ambiente, Via Brecce Bianche, 60131 Ancona, Italy. c. dicamillo @ univpm. it; https: // orcid. org / 0000 - 0002 - 4031 - 8158 c.dicamillo@univpm.it Author Maggioni, Davide 0000-0003-0508-3987 Università degli Studi di Milano-Bicocca, Dipartimento di Scienze dell’Ambiente e della Terra, Piazza della Scienza 1, 20126 Milano, Italy. davide. maggioni @ unimib. it; https: // orcid. org / 0000 - 0003 - 0508 - 3987 & Università degli Studi di Milano-Bicocca, Marine and High Education (MaRHE) Center, 12030 Faafu Magoodhoo, Republic of the Maldives. davide.maggioni@unimib.it text Zootaxa 2021 2021-02-09 4926 3 301 341 journal article 8174 10.11646/zootaxa.4926.3.1 30cfeeeb-5d7b-47ee-9cf9-4b8ee2f29852 1175-5326 4529212 72A46F33-C094-4DEB-BD58-408749AA3155 Callicarpa chazaliei Versluys, 1899 Fig. A3 Callicarpa chazaliei Versluys, 1899: 44 , figs 14, 15.—Fraser, 1947: 13. Description. No complete colonies are known, but their stems are likely unbranched and fascicled. Main stem unsegmented, bearing alternate cladia; a nematotheca near the origin of each cladium. Cladia rather spaced from one another, up to 14.5 mm long, homomerously divided into moderately-long internodes; the latter with a nearly centrally-placed hydrotheca, its complement of three nematothecae (one mesial and a pair of laterals), as well as a distal nematotheca above the hydrotheca; internodes with internal ridges given off adaxially: one proximal and one distal, as well as two additional pairs, one flanking the mesial nematotheca above and below, and the second the lateral nematothecae, equally above and below. Hydrothecae rather deep, inverted-conical, abaxial wall straight or nearly so, adaxial wall slightly concave, aperture set perpendicularly to the length of internode, rim even. Nematothecae movable, elongate, bithalamic, wall of upper chamber emarginated adaxially; mesial nematotheca seated on an adaxial prominence of the internode; lateral nematothecae borne on inconspicuous apophyses. Phylactocarps given off in a plane outside that formed by the two rows of cladia; up to ca . 6 mm long, bearing 10 stacked whorls of verticillate ramuli; each whorl composed of 3 ramuli divided dichotomously once; main trunk with 2 successive pairs of opposite nematothecae, branches with 2 alternate rows of nematothecae. Remarks. Proximal-most portions of phylactocarps occasionally bearing a cladium. Distribution. Off the Dry Tortugas ( ca . 24°37’ N , 82°55’ W , 45 m ), Florida , USA (Versluys 1899) and off Margarita Island ( ca . 11° N , 64° W , 31–40 m ), Nueva Esparta , Venezuela (Fraser 1947).