H. patagonicus Piacentino & Luzzatto 2004

English common names. Patagonian Seahorse.

Synonyms. None

Distribution. Argentina, Brazil (south), Uruguay.

Holotype. MACN 8806. Paratypes: MACN 8807, 8808, 8809.

Type locality. Río Negro, San Antonio Oueste, Bahía, Argentina .

Notes. Molecular research amply supports the diagnosis of H. patagonicus as a species separate from H. erectus (Casey et al. 2004; González et al. 2014; Silveira et al. 2014). It is 6.13% divergent from Brazilian H. erectus (648 bp, CO1, BOLD 2016) which in turn is 1.29% divergent from North American and Caribbean H. erectus .