Sipunculans of the Caribbean coast of Venezuela and Curaçao Author Dean, Harlan K. Author Hernández-Ávila, Iván Author Cutler, Edward B. text Zootaxa 2007 1431 45 54 journal article 10.5281/zenodo.175810 5897c726-be53-4dca-855f-bc3865ca3c37 1175-5326 175810 Thysanocardia catharinae ( Grübe, 1868 ) Phascolosoma catherinae Fritz Müller (?).– ten Broeke, 1925:83–84. Remarks. Members of this genus have a uniform longitudinal muscle layer, two retractor muscles, and contractile vessel villi. T. catherinae has a single, narrow nuchal organ and a lightly pigmented tentacular crown. Distribution. ten Broeke (1925) reported Phascolosoma catherinae as being collected on Porites from Spaansche Water, but erroneously attributed this species to Fritz Müller and did not reference his work. Grübe (1868) actually described this species.