Astronesthes richardsoni chin is ribbon-like and lacks a bulb or swelling at its tip. The dorsal fin has 12 to 14 soft rays and the anal fin has 13 to 18. The origin of the dorsal fin is behind the insertion of the pelvic fins. There is a dorsal adipose fin anterior to the caudal peduncle, and a small ventral adipose fin just anterior to the anus. There are two rows of photophores (luminous spots) on each side of the underside of the fish, numerous other photophores on the head and body and a luminous patch on the edge of the preoperculum;
Caudal Deportivo Mieres" after the Spanish Civil War, as all foreign denominations were forbidden. In 1946 Caudal first reached the third division, promoting to the second five years later – the "Segunda División B" category would only see the light of day in the late-1970s. Starting in 1980 and with the exception of one year, the club would spend the following 18 seasons in the fourth level, then play seven out of eight years in the third, being relegated back in 2004. Caudal won its group in the 2009–10 season – it had already finished first in 2006–07, albeit without promotion –