Mexican populations of H.reidi are listed as species subject to special protection.
Maximum reported height at onset of sexual maturity 8 cm; found in pairs in the wild; egg
diameter averages 1.2 mm; length at birth averages 7 mm; maximum reported brood size 1572
The entire genus Hippocampus is listed in Appendix II of CITES, effective May 2004. H. reidi is listed as Data Deficient by IUCN. Mexican populations are listed in the NOM-059-SEMARNAT- 2001 as species subject to special protection; Mexico prohibits the intentional capture and trade of wild seahorses, permitting only the commercialisation of cultured and incidentally caught seahorses
• H. algiricus is found off West Africa
• H. erectus has a deeper body; white lines on the head and neck; and a wedge-like or triangular coronet, with sharp edges or spines
• H. kuda is found in the Indo-Pacific basin