Common name: Kellogg's seahorse (US); Great Seahorse (Australia); Offshore Seahorse (Vietnam);.o-umi-uma (Japan)
Scientific name: Hippocampus kelloggi, Jordan & Snyder 1902
Synonyms:
Hippocampus suezensis

Maximum size: 11+ inches (28.0 cm).

Climate: subtropical to tropical, but primarily tropical

Distribution:
Red Sea and Indian Ocean: Tanzania (Zanzibar), Pakistan (Kurachei), India (Madras, Malabar);
Southeast Asia: Danang Sea, Philippines, China and Taiwan; Japan and Australia (southeast Queensland, north New South Wales, Lord Howe Island.

Meristic Counts:
Rings: 11 trunk rings + 40 tail rings (tail rings vary from 39-41).
Dorsal fin rays: 18 rays (varies from 17 -19) spanning 2 trunk rings + 1 tail ring.
Pectoral fin rays: 18 soft rays (varies from 17-19).
Morphometrics:
Snout length: 2.1 (2.0- 2.3) in head length. (The length of the snout fits into the length of the head only about 2 times. In others, this seahorse has a relatively long snout that measures about 1/2 the length of its head.)
Other distinctive characters:
Coronet: medium-high, with five short spines, and a distinctive high plate in front of the crown.
Spines: low and rounded, always blunt tipped, even in the youngest specimens which have better developed spines. Adults are relatively smooth bodied.
Key Features: a prominent cheek spine (long but rounded) that points backward slightly; a deep head with a thick snout; a slender body with a long trunk and noticeably thick rings, a long tail, and a prominent eye spy (fairly tall but rounded).
Adult height: 6-10 inches (15.0-25.0 cm).

Color and Pattern:
H. kelloggi is typically a pale seahorse with uniform coloration, often adorned with tiny white spots that coalesce to form vertical lines (Lourie at all, 1999). There is some evidence suggesting sexual dimorphism in this species, with the males being darker (brownish to black), while juveniles and females are sometimes lighter in coloration (cream or yellowish), often with pale saddles or patches (Kuiter 2000). The stallions also tend to be slimmer than the females (Coit, pers. com.)

Cultured specimens often exhibit a color pattern that is similar to H. kuda, featuring a yellowish to pale olive green background coloration sprinkled profusely with small dark spots.  Other color patterns are often Onyx Black, Gray, White, Orange, Yellow or a mixture of these.

This is a very slender seahorse with a long trunk, a long tail, and a thick snout that tends to flare out at the tip (Kuiter 2000)

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