Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Syngnathiformes
(Pipefishes and seahorses) > Syngnathidae
(Pipefishes and seahorses) > Hippocampinae
Etymology: Hippocampus: Greek, ippos = horse + Greek,kampe = curvature (Ref. 45335); severnsi: the first specimens (Ref. 79848).
Environment / Climate / Range
Marine; benthopelagic; depth range 8 - 20 m (Ref. 79848). Tropical
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 1.7 cm SL male/unsexed; (Ref. 79848); 1.6 cm SL (female)
Morphology | Morphometrics
Extremely small size (height 13 mm, standard length 15 mm); 12 trunk rings; 27 tail rings;
reduced ossification of inferior and ventral trunk ridges; 14 dorsal fin rays; 10 pectoral fin rays; small or absent anal fin; medium length snout which lacks a bulbous tip; raised, angular coronet; single gill opening on midline directly behind coronet supported by raised cleithral bone; scattered tubercles on trunk and tail; predominant colour dark brown (sometimes slightly marbled) with large, bright red patch covering dorso-lateral surfaces of TrR 1–4; tiny white dots scattered all over; pale posterior section of tail with dark transverse bands (Ref. 79848).
Countries | FAO areas | Ecosystems | Occurrences | Introductions | Faunafri
Pacific Ocean: Indonesia, Japan, Papua New Guinea, Solomon Islands and Fiji (Ref. 79848).
Hippocampus severnsi is known from Indonesia (Bunaken, Wakatobi, Raja Ampat Islands, Kawe Island), Japan (Ryukyu Islands), Papua New Guinea (Milne Bay, Madang), Solomon Islands (Mborokua) and Fiji at depths of 8-20 m. It has been observed both during the day and the night but is apparently more active in the morning and late afternoon when it is not in direct sunlight (Müller, pers. comm.). In Indonesia it has been recorded in association with a yellow coloured bryozoan, Catenicella sp., on different kinds of hydrozoans including Lytocarpus phoenicea, Antennellopsis integerrima and Halicordyle disticha (Müller, pers. comm.) as well as in sheltered spots on a reef wall in association with Halimeda (Brett, pers. comm.). It is also recorded from fissures on current–swept walls where it will tend to occur on the side of the fissure that faces away from the current, but in all cases where there is some upward current (Müller, pers. comm.) and has been seen swimming over a fungiid coral (Hardt, pers. comm.). In Papua New Guinea it has been observed in a healthy reef passage with a regular current of up to two knots on a gorgonian of the genus Muricella at 12 m depth (Halstead, pers. comm.) and in Fiji it was found on gorgonian species, possibly Menella sp.? (Tackett, pers. comm.) The holotype of H. severnsi, collected in June, had approximately 11 embryos within its pouch (Ref. 79848).
Lourie, S.A. and R.H. Kuiter, 2008. Three new pygmy seahorse species from Indonesia (Teleostei: Syngnathidae: Hippocampus). Zootaxa 1963:54-68.
IUCN Red List Status (Ref. 90363)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
CollaboratorsPicturesStamps, CoinsSoundsCiguateraSpeedSwim. typeGill areaOtolithsBrainsVision
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Trophic Level (Ref. 69278
): 3.0 ±0.5 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .
Price category (Ref. 80766