View original imageThis is an original generative reconstruction, not a photograph or scientific plate.
100 / Recently extinct
Japanese Sea Lion
Zalophus japonicus
This large coastal sea lion bred on rocky islands across the Sea of Japan.
Structured expansion · editorial review pending
- Time range
- Prehistory–1970s
- Final stage
- 20th century
- Geographic range
- Sea of Japan · Coasts of Korea and Japan
01 / ANSWER FIRST
What was Japanese Sea Lion?
This archive records Japanese Sea Lion under the scientific name Zalophus japonicus, with an age of Prehistory–1970s and a range of Sea of Japan · Coasts of Korea and Japan. This large coastal sea lion bred on rocky islands across the Sea of Japan.
Japanese sea lions hauled out in colonies and fed on fish and squid. Commercial exploitation intensified in the 19th and 20th centuries until only scattered reports remained.
02 / QUICK FACTS
Japanese Sea Lion at a glance
- Scientific name
- Zalophus japonicus
- Age
- Prehistory–1970s
- Last recorded stage
- 20th century
- Known range
- Sea of Japan · Coasts of Korea and Japan
- Broad group
- mammal or synapsid
- Archive era
- Recently extinct
- Habitat signals
- Ocean
- Documented regions
- Asia
03 / ANATOMY
How was Japanese Sea Lion built?
Overall body plan
This large coastal sea lion bred on rocky islands across the Sea of Japan.
Skull, teeth and feeding mechanics
The available record is interpreted through preserved proportions, attachment surfaces, wear and comparison with related organisms. For Japanese Sea Lion, those observations must be separated from features added only for visual reconstruction.
Limbs, posture and body mass
Japanese sea lions hauled out in colonies and fed on fish and squid. Commercial exploitation intensified in the 19th and 20th centuries until only scattered reports remained.
Growth and individual variation
A single specimen does not define the whole species. Size, maturity, preservation and possible sex differences are considered before anatomical traits are treated as typical of Japanese Sea Lion.
04 / DIET & BEHAVIOUR
How did Japanese Sea Lion live?
Japanese sea lions hauled out in colonies and fed on fish and squid. Commercial exploitation intensified in the 19th and 20th centuries until only scattered reports remained. This ecological reconstruction is strongest where anatomy, associated organisms and the depositional setting point in the same direction.
05 / DIET & BEHAVIOUR
What shaped its ecological limits?
Its populations depended on food webs, vegetation, water, climate and competition. Changes in any one factor did not necessarily cause immediate extinction, but interacting pressures could reduce range, recruitment and resilience.
06 / RANGE & HABITAT
Where and when did Japanese Sea Lion live?
This archive currently lists Prehistory–1970s; Sea of Japan · Coasts of Korea and Japan. Fossil or historical occurrence data describe where evidence has been found, not every place the taxon once occupied. Species-level age and range limits still require source-specific review.
Documented geographic range
Sea of Japan · Coasts of Korea and Japan. This boundary can change when specimens are reidentified or new localities are published.
Time window
Prehistory–1970s, with the final recorded stage listed as 20th century. Rock units and dating uncertainty mean the true biological range may extend beyond the known record.
Environmental setting
The archive uses the broad habitat labels Ocean. These labels help explore related records; a habitat reconstruction requires evidence from individual localities.
07 / FOSSIL EVIDENCE
What evidence supports reconstructions of Japanese Sea Lion?
Primary record
Mounted specimens, photographs, fishery records, bones and unconfirmed late sightings tell its story.
Comparative anatomy
Preserved structures are compared with close and functionally similar organisms. The method can constrain posture and function, but analogy alone cannot prove colour, behaviour or soft tissue.
Age and locality
Stratigraphy and occurrence records place Japanese Sea Lion within Prehistory–1970s and Sea of Japan · Coasts of Korea and Japan. Reworked fossils and uncertain provenance are treated cautiously.
Open entity records
Links below connect the archive to available taxonomic and occurrence records. A matching name does not verify every ecological claim, and related-taxon links provide comparison rather than an exact species match.
08 / DISAPPEARANCE & DEBATE
Why did Japanese Sea Lion disappear?
Hunting for oil and hides, disturbance and wartime habitat damage drove the decline.
The last fossil or observation marks the youngest evidence currently known, not necessarily the death of the final individual. Explanations are strongest when timing, environmental change and population biology agree; otherwise the profile preserves uncertainty instead of assigning a single dramatic cause.
09 / FREQUENTLY ASKED QUESTIONS
Japanese Sea Lion FAQ
What was Japanese Sea Lion?
This archive records Japanese Sea Lion under the scientific name Zalophus japonicus, with an age of Prehistory–1970s. This large coastal sea lion bred on rocky islands across the Sea of Japan.
When did Japanese Sea Lion live?
The current archive range is Prehistory–1970s; its youngest recorded stage is 20th century.
Where was Japanese Sea Lion found?
The archive currently lists Sea of Japan · Coasts of Korea and Japan. Species-level locality assignments and the full geographic range still require source-specific review.
How do scientists know about Japanese Sea Lion?
Mounted specimens, photographs, fishery records, bones and unconfirmed late sightings tell its story.
04 / SOURCES & FURTHER READING
Check the source record
Use the scientific name to compare taxonomy, occurrence records and the fossil record. Database coverage and classifications may differ.
05 / REVISION HISTORY
How has this record changed?
- Completed an AI-assisted bilingual audit of the archive record, corrected identified issues and clarified evidence limits; independent editorial review is pending.
- Expanded into a structured bilingual profile with anatomy, ecology, range, evidence, debate and FAQs; independent editorial review is pending.
- Verified authoritative entity sources and added three responsive reconstruction sizes.
- Initial bilingual species record published.
06 / CORRECTIONS & ADDITIONS