These three sites belong to the Indian Ocean biogeographic province of hydrothermal vent systems sensu Rogers et al. The distance between Solitaire and Longqi is about 2,500 km (1,600 mi).
The distance between Kairei and Solitaire is about 700 km (430 mi). Longqi field was designated as the type locality all type material originated from this vent field. The species was discovered in 2001, living on the bases of black smokers in the Kairei hydrothermal vent field, 25☁9.239′S 70☀2.429′E / 25.320650°S 70.040483☎ / -25.320650 70.040483, on the Central Indian Ridge, just north of the Rodrigues Triple Point. The scaly-foot gastropod is a vent-endemic gastropod known only from the deep-sea hydrothermal vents of the Indian Ocean, which are around 2,780 metres (1.73 mi) in depth. Its heart is, proportionately speaking, unusually large for any animal: the heart comprises approximately 4% of its body volume. This species is considered to be one of the most peculiar deep-sea hydrothermal-vent gastropods, and it is the only known extant animal that incorporates iron sulfide into its skeleton (into both its sclerites and into its shell as an exoskeleton). The snail's oesophageal gland houses symbiotic gammaproteobacteria from which the snail appears to obtain its nourishment. The foot is also unusual, being armored at the sides with iron-mineralised sclerites. The shell is of a unique construction, with three layers the outer layer consists of iron sulfides, the middle layer is equivalent to the organic periostracum found in other gastropods, and the innermost layer is made of aragonite. In 2019, it was declared endangered on the IUCN Red List, the first species to be listed as such due to risks from deep-sea mining of its vent habitat. squamiferum differs greatly from other deep-sea gastropods, even the closely related neomphalines. This vent-endemic gastropod is known only from deep-sea hydrothermal vents in the Indian Ocean, where it has been found at depths of about 2,400–2,900 m (1.5–1.8 mi). Chrysomallon squamiferum, commonly known as the scaly-foot gastropod, scaly-foot snail, sea pangolin, or volcano snail is a species of deep-sea hydrothermal-vent snail, a marine gastropod mollusc in the family Peltospiridae.
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