Halitherium antillense Matthew, 1916 was established on a left mandibular fragment and two vertebrae from late Oligocene deposits of Puerto Rico. This species was only provisionally referred to the genus Halitherium and its taxonomic status and systematic affinities remained doubtful. In the course of the revision of the Halitherium-species complex and the meanwhile invalid generic name “Halitherium”, the holotype, and only known specimen, is re-investigated. A number of morphological characters usually diagnostic in sirenians are determined. However, the holotype material of “H.” antillense is not informative enough and, as such, neither can be assigned to any known species nor is it possible to define a taxon that can be clearly distinguished from other species. Unlike other, now revised species originally grouped under “Halitherium”, the establishment of a new taxonomic combination for “H.” antillense is not possible. As a nomenclatural consequence, the name “H.” antillense is only applicable to a single specimen, the holotype, and declared as a nomen dubium.

Halitherium antillense Matthew，1916年建立在波多黎各晚渐新世沉积的左下颌骨碎片和两个椎骨上。该物种仅被临时称为Halitherium属，其分类学地位和系统亲和力仍然令人怀疑。在对Halitherium-种复合体进行修订的过程中，同时又对无效的通用名称“ Halitherium ”进行了整型和唯一已知标本的研究。确定了通常在海妖中诊断出的许多形态特征。但是，“ H。 ”反义词的原型材料信息不充分，因此既不能分配给任何已知物种，也不能定义可以与其他物种区分开的分类单元。与最初归类于“ Halitherium ”下的其他现已修订的物种不同，不可能为“ H. ”防盗建立新的分类学组合。作为命名的结果，antillense名称“ H. ”仅适用于单个标本，即整型，并声明为nob dubium。