Antillophos lucubratonis: Shell small for the genus. Holotype: 15.1 mm in length. Shape broad, oval with a short spire. Teleoconch with 5 whorls. Ground colour white, pattern consisting of fine red brown spiral lines on top of the spiral sculpture, forming a darker peripheral band. Protoconch with 3, white whorls. Tip eroded. Second whorl with 2 keels. Last whorl with 4 spiral keels. Last part with several curved axial riblets. The first teleoconch whorl is ornamented with 3 strong, red brown, primary spiral cords, interspaces broad with a fine secondary spiral thread. From third whorl some secondary spiral cords become as strong as the primary and again a secondary spiral cord appears at each side. Body whorl with 16 fine spiral cords, of which the 3 adapical ones that have narrow interspaces, the abapical spiral cords have a broad interspace with a fine secondary cord. First teleoconch whorl with 13 strong, sharp axial ribs, interspaces of equal size. Body whorl with 13-23 strong and sharp axial ribs, interspaces wide. A few pale or white varices occur. Aperture semi-ovate. Outer lip with many internal lirae. Columella without (holotype) or with 4 (paratype) strong abapical folds and 1 adapical knob. Siphonal canal open, broad and short, outer part smooth. Operculum, periostracum and animal unknown.

Antillophos lucubratonis: A. (A.) lucubratonis n. sp. is characterized by the broad shape in combination with a fine spiral sculpture with broad interspaces and only 1 fine secondary spiral, the top of the sculpture with fine red brown spiral lines.

A. (A.) elegantissimum (Hayashi & Habe, 1965) is much similar in pattern and sculpture, but differs by the more elongate shape with conical spire (instead of oval), by the much higher number of secondary spiral cords (3 to 7, instead of 1) which are not patterned, by the weaker axial sculpture, by the varices patterned with some brown blotches, by the dark protoconch, and by the larger size.

For difference with A. (A.) dedonderi sp. n., which is most similar in pattern, we refer to the comparison under that species.

Antillophos lucubratonis: TYPE LOCALITY
The Philippines, offshore Aliguay Island, between 60 and 120 m deep.
DISTRIBUTION
Known from Aliguay (the type locality) and from off Mactan Island, trawled, 80-100 m deep

Antillophos lucubratonis: Antillophos (A.) lucubratonis n. sp. is derived from the Latin expression lucubratonis (adj.) meaning "a study at nightime" and "made under lamplight" to remember the many hours we have spend, studying material, to find more specimens of this rare species.