Callionymus oxycephalus is a species of dragonet endemic to the Red Sea.
Callionymus bentuviai Ben-Tuvia's deepwater dragonet, is a species of dragonet endemic to the Red Sea.
 This species grows to a length of 6.3 cm SL.
Callionymus decoratus, the Decorated dragonet, is a species of dragonet endemic to the waters around the Hawaiian Islands where it occurs at depths of from 1 to .
 This species grows to a length of 20.8 cm SL.
Callionymus mascarenus, the Mauritius dragonet, is a species of dragonet endemic to the Indian Ocean waters around Mauritius.
 This species grows to a length of 4.9 cm SL.
Callionymus bleekeri, Bleeker's deepwater dragonet, is a species of dragonet endemic to the Pacific Ocean waters around Indonesia.
Callionymus caeruleonotatus, the Blue-spotted dragonet, is a species of dragonet endemic to the waters around the Hawaiian Islands where it occurs at depths of from 42 to .
 This species grows to a length of 5.4 cm SL.
Callionymus io is a species of dragonet endemic to the Indian Ocean waters off of Myanmar.
 This species grows to a length of 2.5 cm SL.
The Red Sea (also the Erythraean Sea) is a seawater inlet of the Indian Ocean, lying between Africa and Asia.
 The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden.
 To the north lie the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez (leading to the Suez Canal).
 The Red Sea is a Global 200 ecoregion.
 The sea is underlain by the Red Sea Rift which is part of the Great Rift Valley.
Callionymus comptus, the Ornamented dragonet, is a species of dragonet endemic to the waters around the Hawaiian Islands where it occurs at depths of from 3 to .
 This species grows to a length of 3 cm SL.
Callionymus colini, the Tiny New Guinea longtail dragonet, is a species of dragonet endemic to the Pacific Ocean waters around Papua New Guinea.

Question: Callionymus oxycephalus is a species of dragonet endemic to a seawater inlet of which ocean ?
Answer: Indian Ocean