Checklist of ascidians (Chordata, Tunicata) from the southern Gulf of Mexico Author A. Palomino-Alvarez, Lilian Author Moreira Rocha, Rosana Author Simoes, Nuno text ZooKeys 2019 832 1 33 http://dx.doi.org/10.3897/zookeys.832.31712 journal article http://dx.doi.org/10.3897/zookeys.832.31712 1313-2970-832-1 961F1299F1A3432794B315609F6F5A65 Botrylloides magnicoecus (Hartmeyer, 1912) Fig. 4P Material examined. CAGoM-0125, B10, 11 m, 17-06-2015, leg. L. Palomino-Alvarez. Remarks. This is the first record of B. magnicoecus in the Gulf of Mexico. General characteristics agree with descriptions by Brunetti (2010) , but caecum size in the Mexico specimens is larger. Global distribution. According to Brunetti (2010) the records from South Africa have characteristics in agreement with the type and are trustful ( Michaelsen 1934 ; Millar 1955 ). Recently a new record from French Guiana ( Monniot 2016 ) has been published. A more detailed study of the species in the type locality should be performed to permit the revision of other records in the Atlantic (Guadeloupe - Monniot 1983b , Belize - Goodbody 2004 ).