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

Context paragraphs:
Callionymus oxycephalus: Callionymus oxycephalus is a species of dragonet endemic to the Red Sea.

Callionymus bentuviai: 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.

Decorated dragonet: 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.

Mauritius dragonet: 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: Callionymus bleekeri, Bleeker's deepwater dragonet, is a species of dragonet endemic to the Pacific Ocean waters around Indonesia.

Bluespotted dragonet: 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: 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.

Red Sea: 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.

Ornamented dragonet: 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: Callionymus colini, the Tiny New Guinea longtail dragonet, is a species of dragonet endemic to the Pacific Ocean waters around Papua New Guinea.

Supporting paragraphs: Callionymus oxycephalus Red Sea
Answer: Indian Ocean