Hippocampus subelongatus, Castelnau 1873

Sara A. Lourie, Riley A. Pollom & Sarah J. Foster, 2016, A global revision of the Seahorses Hippocampus Rafinesque 1810 (Actinopterygii: Syngnathiformes): Taxonomy and biogeography with recommendations for further research, Zootaxa 4146 (1), pp. 1-66: 41

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Hippocampus subelongatus


H. subelongatus Castelnau 1873 

English common names. West Australian Seahorse, tiger snout seahorse. Synonyms. H. elongatus Castelnau 1873  .

Paratypes: MNHN A-4535, MNHN A-4536, MNHN A-4552 (according to Kuiter 2001) MNHN A-4535 is probably the holotype of H. subelongatus  , and A-4536 is probably the holotype of H. elongatus  ).

Type locality. Swan River , Western Australia. 

Distribution. Australia (southwest).

Notes. Meristic data largely overlap between H. subelongatus  and H. angustus  (Appendix B). Genetic divergence between H. subelongatus  from Rockingham and H. angustus  from Cape Bossut is 1.99% (652bp, CO1) ( Harasti 2014), which is just about at the cut-off that we set for species distinctions for this revision. However the same specimen from Rockingham had an identical haplotype to a specimen of H. angustus  from Denham, Shark Bay ( BOLD 2016). Further investigation is warranted. In the meantime we continue to recognize H. subelongatus  as a species separate from H. angustus  . In support of this decision, H. subelongatus  specimens do have distinctive, very tall and rounded coronets, and are not at all spiny, unlike their northern congeners that are distinctly spiny.


Museum National d'Histoire Naturelle