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🧬 Biological Classification (Kingdom to Species)Sphyrna lewini

Kingdom

Animalia

Phylum

Chordata

Class

Elasmobranchii

Order

Carcharhiniformes

Family

Sphyrnidae

Genus

Sphyrna

Species

Sphyrna lewini

Elasmobranchii🌊 Marine predator / filter feeder

Scalloped hammerhead

Sphyrna lewini (Scalloped hammerhead · アカシュモクザメ)

🛡️ Conservation Status (IUCN Red List)CR (Critically Endangered)

DDData Deficient

LCLeast Concern

NTNear Threatened

VUVulnerable

ENEndangered

CRCritically End.

EWExtinct in Wild

EXExtinct

🇰🇷 Marine Protected Species (Korea)

Geological Era

Extant

Diet

Marine predator / filter feeder

Length · Height

4.3m · No data

Mass · Top Speed

152.4kg · No data

Habitat & Fossil Locality

Continental shelves and island margins of tropical and temperate coastal seas (depths of 0–1043 m, usually 0–25 m), also entering bays and estuaries

💡 Everyday Comparisons for Size, Mass & Speed

💡 A body length of 4.3 m is close to the length of a passenger car (about 4.5 m) (Comparison).
💡 Korea's Ministry of Oceans and Fisheries noted that high prices for shark fins used in shark-fin soup have led to many sharks being finned and discarded at sea, causing scalloped hammerhead numbers to drop sharply.
💡 Korea's Ministry of Oceans and Fisheries advises reporting any scalloped hammerhead found caught in a net or washed ashore to the marine emergency hotline 122.

Reference standards: coach bus ~12 m, mid-size car ~4.9 m, compact car ~1 t, basketball hoop 3.05 m, credit card 8.56 cm.

📊 Mass & Speed Index (0–100)

⚖️ Mass Index (Blue Whale ~190 t = 100, log scale)63

Site-computed relative index from recorded values; not a formal scientific metric.

#홍살귀상어#Sphyrna lewini

📖 1. Overview

The scalloped hammerhead is a shark with a T-shaped hammer head living in warm coastal waters worldwide. It is assessed as Critically Endangered (CR, 2019) on the IUCN Red List.

🦴 2. Anatomy & Morphology

Its laterally expanded head gives it a wide field of view and a well-developed sense of smell, with a distinct indentation at the center of the front edge. Sensory organs called ampullae of Lorenzini allow it to detect changes in water temperature and pressure as well as faint electrical signals from nearby fish.

🔍 3. Ecology & Behavior

It mainly eats bony fish, squid, and octopuses, as well as shrimp, crabs, other sharks, and rays. It is placental viviparous, giving birth to 12–41 pups after a 9–10 month gestation.

🇰🇷 4. Connection to Korea

Korea's Ministry of Oceans and Fisheries designated it as a Marine Protected Species in October 2016 and selected it as the Marine Species of the Month in December, citing sharp population declines from shark finning. Anyone finding one caught in nets or washed ashore is advised to report it via the marine emergency number 122.