taxonID	type	description	language	source
7A9C1268FA635B55A94B52D2FAF817D6.taxon	description	1, 2, 3; Table 1	en	Rathnasuriya, Mahadurage I. G., Hapuarachchi, Thennakoon H. I. S. (2025): First record of oarfish, Regalecus russellii (Actinopterygii, Lampriformes, Regalecidae), from Sri Lankan waters, Indian Ocean. Acta Ichthyologica et Piscatoria 55: 145-150, DOI: 10.3897/aiep.55.148496
7A9C1268FA635B55A94B52D2FAF817D6.taxon	description	Description. Total length 2580 mm. Other measurements, counts, and proportional measurements in Table 1. Dorsal fin with 337 total soft dorsal rays; two dorsal crests (1 crest: 5 rays united by fin membranes; 2 crest: single ray free from other rays); preanus dorsal fin rays 77; pectoral fin rays 12; pelvic fin rays 1 stout, damaged; non-anal fin rays; caudal fin rays not evident; number of gill rakers on first gill arch 55 (12 + 43), elongated gill rakers with minute ridges projecting on the inner and outer margin (12 ridges on one side of longest gill raker); body long, deeply compressed, ribbon-like, tapered towards tail, without scales but covered with dermal tubercles with circular bases, either with or without conical or blunt point, tubercles are more prominent towards tail end and lower sides of body (especially lower edge of tail). Anal fin absent. Head small and head length 9.1 % in TL. Head profile almost vertical prior to dorsal fin origin. Maximum body depth about 68.1 % in head length. Mouth small, vertical, protractible and teeth absent. Single nostril presents on each side of snout. Dorsal fin origin well anterior to orbit; first five dorsal rays of first dorsal crest elongated (first four dorsal rays approximately 18 % in TL, fifth dorsal ray approximately 12 % in TL) and a single dorsal ray of second dorsal crest and subsequent rays relatively short; cristophore presents and supports to the first dorsal fin crest. Pectoral fins lanceolate, present low as horizontal line of anterior lower margin of preopercle, origin anterior to pelvic fin and horizontally oriented. Esophageal caecum (Roberts 2017) extends towards end of body, and its body length 37 % in TL.	en	Rathnasuriya, Mahadurage I. G., Hapuarachchi, Thennakoon H. I. S. (2025): First record of oarfish, Regalecus russellii (Actinopterygii, Lampriformes, Regalecidae), from Sri Lankan waters, Indian Ocean. Acta Ichthyologica et Piscatoria 55: 145-150, DOI: 10.3897/aiep.55.148496
