Taxonomy and diversity of hydroids (Cnidaria: Hydrozoa) of Sergipe, Northeast Brazil Author Castro Mendonça, Luana M. Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Alagoas. Avenida Lourival Melo Mota, & Programa de Pós-Graduação em Zoologia, Departamento de Zoologia, Setor de Ciências Biológicas, Universidade Federal do Paraná. Caixa Postal 19020, 81531 - 980 Curitiba, PR, Brazil. mahaddad. 2014 @ gmail. com Author Parisotto Guimarães, Carmen R. Departamento de Biologia, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Sergipe. Avenida carmenparisotto@gmail.com Author Haddad, Maria A. Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Alagoas. Avenida Lourival Melo Mota, text Zoologia 2022 e 21032 2022-11-25 39 1 65 http://dx.doi.org/10.1590/s1984-4689.v39.e21032 journal article 10.1590/S1984-4689.v39.e21032 1984-4689 13176475 2B189EA2-803A-428C-AE26-C3669A5F3100 Diphasia digitalis (Busk, 1852) Fig. 21B–C Synonyms available from: Watson (2000) . Sertularia digitalis Busk, 1852: 387 , 393. Nigellastrum digitale – Vannucci 1949 , 1951a [polyp]. Diphasia digitalis – Maÿal, 1983: 7 . Description: Colonies erect, up to 32 mm high, arising from a creeping and tubular hydrorhiza. Stem monosiphonic, composed of several internodes. First internode long, ahydrothecate, separated by a transverse node. Hydrocladia 7.5–23.1 mm long, arising from the stem at angles of 97.7–137.6 ° , also composed of internodes. Stem and hydrocladia with a pair of hydrothecae per internode. Hydrothecae tubular, elongate, 0.85–0.99 mm high, 0.24–0.27 mm in maximum width, expanding from the base to the distal portion, adnate to internode for more than half their high, free end portion slightly curving outward. The adnate portion of paired hydrothecae in contact. Margin quadrangular, operculum with a wide acauline valve. Material examined: VB – few infertile colonies from the dry and rainy seasons. CZUFS CNI-00062; CNI-00207. Stations: VB – C1P56, C2P12, C2P34, C3P56. Distribution: Brazil – Bahia ( Nutting 1904 ), Pernambuco ( Maÿal 1983 , Calder and Maÿal 1998 ), Rio de Janeiro ( Vannucci 1949 , 1951a , Miranda et al. 2015 ), São Paulo ( Silveira and Morandini 2011 , Fernandez et al. 2014 ), and Santa Catarina ( Bouzon et al. 2012 ). World distribution – circumglobal in tropical and subtropical regions ( Watson 2000 ). Remarks: Colonies large, mainly colonizing the plates, and partially on Polychaeta tubes, Bryozoa, Ascidiacea, and the hydroids Corydendrium parasiticum and Pennaria disticha .