Yellow Arrow

Picture Source: Google

Species: Merulanella sp. “Yellow Arrow”
Origin: Vietnam

(Based on our own experiences)

Difficulties to Keep: ⭐⭐⭐⭐☆ (4/5)
Humidity Level: 💧💧💧💧☆ (4/5)

Category: Very High-End Isopod

Description:
Merulanella sp. “Yellow Arrow” is a highly sought-after Merulanella species known for its bright yellow to golden coloration combined with dark contrasting markings that often form arrow-like patterns along its body. This sharp contrast gives it a striking “warning signal” appearance, making it one of the most eye-catching Merulanella in the hobby.

This species grows to a small to medium size and requires very stable, carefully controlled conditions. It prefers consistently high humidity with good airflow and a mature bioactive setup to maintain long-term health. It is sensitive during acclimation and does not tolerate unstable environments well.

Once established, it becomes a flagship collector species, valued for its vivid coloration, unique patterning, and strong high-end demand among advanced Merulanella keepers.