subequatorial
/ˌsʌbˌɛkwəˈtɔːrɪəl/adjective
Designating regions immediately adjacent to equatorial regions, or, alternatively, regions which lie south of the equator; of, relating to, or inhabiting such regions.
Origin
Mid 19th century; earliest use found in William C. L. Martin (1798–1864), writer on natural history. From sub- + equatorial.