**Desmodema**
**Definition**
Desmodema is a genus of marine ray-finned fishes belonging to the family Trachipteridae, commonly known as ribbonfishes. These deep-sea fishes are characterized by their elongated bodies and distinctive ribbon-like appearance.
**Overview**
Desmodema species inhabit deep oceanic waters and are known for their slender, ribbon-shaped bodies that can reach considerable lengths. They possess a dorsal fin that runs almost the entire length of their body, contributing to their unique morphology. These fishes are rarely encountered due to their deep-sea habitat.
**Species**
The genus Desmodema includes two recognized species: *Desmodema polystictum*, commonly referred to as the dealfish, and *Desmodema lorum*. Both species share similar habitats and morphological traits but differ slightly in size and distribution.
**Habitat and Distribution**
Desmodema species are found in temperate and tropical oceanic waters worldwide, typically at depths ranging from several hundred to over a thousand meters. Their deep-sea environment makes them less studied compared to shallow-water fishes.
**Biology and Ecology**
Little is known about the biology and ecology of Desmodema species due to their elusive nature. They are presumed to feed on smaller fishes and invertebrates, using their elongated bodies to navigate the deep-sea environment efficiently.
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**Meta Description:**
Desmodema is a genus of deep-sea ribbonfishes known for their elongated, ribbon-like bodies. They inhabit temperate and tropical oceanic waters and include two recognized species.