lautnusantara.com_The nautilus (Nautilus pompilius) is one of the ancient marine animals that has survived to the present day and is often referred to as a living fossil. This species is characterized by its chambered spiral shell, which has existed for hundreds of millions of years. This article discusses the biology, morphology, habitat, behavior, ecological role, and conservation status of Nautilus pompilius as an important representative of ancient marine biodiversity.

• Introduction

The oceans harbor various unique organisms that represent the long evolutionary history of life on Earth. One such organism is Nautilus pompilius, a marine mollusk belonging to the class Cephalopoda that has existed since the Paleozoic era. Unlike its relatives such as octopus and squid, the nautilus retains an external shell as protection. The existence of the nautilus is important not only scientifically but also as an indicator of the health of deep-sea ecosystems.

• Classification and Morphology

Nautilus pompilius belongs to the phylum Mollusca, class Cephalopoda, and order Nautilida. Its most distinctive feature is the brownish-white spiral shell with dark stripes. The shell consists of several chambers separated by septa, which the nautilus uses to regulate buoyancy by adjusting gas and fluid within the chambers.

The body of the nautilus is equipped with dozens of tentacles without suckers, unlike modern cephalopods. Its eyes are relatively simple and lack lenses, yet they are capable of detecting light and shadows in the deep-sea environment.

• Habitat and Distribution

Nautilus pompilius is commonly found in tropical Indo-Pacific waters, including Indonesia, the Philippines, Papua New Guinea, and northern Australia. This species inhabits coral reef slopes at depths ranging from 100 to 500 meters. At night, nautiluses migrate to shallower waters to feed, while during the day they return to deeper areas to avoid predators.

• Behavior and Feeding Habits

Nautiluses are nocturnal animals and primarily scavengers. Their diet consists of small crustaceans, dead fish, and other benthic organisms. Their movement is relatively slow, relying on a simple form of jet propulsion for locomotion.

• Ecological Role

In marine ecosystems, nautiluses play a role in the food chain and contribute to nutrient recycling through their feeding activities. Their presence also provides valuable information for scientists studying cephalopod evolution and the adaptation of marine organisms to environmental changes over millions of years.

• Conservation Status and Threats

Populations of Nautilus pompilius are currently declining due to overexploitation, particularly for the trade of shells used as ornaments and collectibles. In addition, habitat degradation and climate change pose serious threats. Consequently, several countries have implemented protective measures and trade restrictions through national and international regulations.

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