On November 5, 1900, one of the 20th century’s most beloved and honored ichthyologists was born in Penzance, Cornwall, England -- Ethelwynn Trewavas, affectionately known among her colleagues as “E.T.”

From Ichthyopedia: “From 1917 to 1921, [Trewavas] was a student at Reading University College (now Reading University), where she received a BSc honours degree. After graduation she worked for some four years as a science teacher and then attended the University of London, where she received her doctor of science degree in 1934. In 1928 Charles Tate Regan (1878–1943), then director of the British Museum (Natural History), hired her as his research assistant, a position she held until she transferred to the regular staff of the museum in 1935. She collaborated with Regan in publishing studies of fishes of several families collected during the Dana expeditions of 1920–1922 and 1928–1930 and worked on a number of other families of fishes on her own, including the Sciaenidae and Mugilidae, but she is best known for her studies of African cichlids, especially those of Lake Nyasa (now Lake Malawi). She has been recognized for her outstanding career by the American Society of Ichthyologists and Herpetologists (Honorary Foreign Member, 1946), Linnean Society of London (Linnean Medal, 1968; Fellow, honoris causa, 1991), and the University of Stirling (DSc, honoris causa, 1986). Trewavas died at her home near Reading, England, on 16 August 1993, from the effects of a heart attack.” Over the course of her career, “E.T.” produced more than 120 publications, including books, monographs, scientific papers, and popular articles. She was the sole or first author of 95% of these publications. Even more impressive is the large number of taxa she described or co-described, across 16 different families, that are still valid today. By my count …

62 genera
9 subgenera
251 species
9 subspecies
Not surprisingly, may new fishes have been named in her honor:
A conger eel, Rhynchoconger trewavasae Ben-Tuvia 1993
Two cyprinids, Garra trewavasae Monod 1950 and Garra ethelwynnae Menon 1958
A distichodontid, Neolebias trewavasae Poll & Gosse 1963
A hillstream catfish, Glyptothorax trewavasae Hora 1938
A scaleless black dragonfish, Eustomias trewavasae Norman 1930
Seven African cichlids, Petrochromis trewavasae Poll 1948, Labeotropheus trewavasae Fryer 1956, Gobiocichla ethelwynnae Roberts 1982, Aulonocara ethelwynnae Meyer, Riehl & Zetzsche 1987, Tylochromis trewavasae Stiassny 1989, Copadichromis trewavasae Konings 1999, and Placidochromis trewavasae Hanssens 2004
A priapum fish, Phenacostethus trewavasae Parenti 1986
A tonguefish, Symphurus trewavasae Chabanaud 1948
Three drums or croakers, Atrobucca trewavasae Talwar & Sathiarajan 1975, Protosciaena trewavasae (Chao & Miller 1975), and Johnius trewavasae Sasaki 1992
A leftvent anglerfish, Linophryne trewavasae Bertelsen 1978
In addition, two fish genera have been named for Ethelwynn Trewavas. One is for an extinct pycnodontid fish (Coccodontidae), Trewavasia White & Thomas 1941, from the lower Cenomanian (100.5-93.9 MYA) of what is now Lebanon. The other is based on her “E.T.” nickname.
In 2003, Ulrich K. Schliewen (Max-Planck-Institute, München, Germany) and Melanie L. J. Stiassny (American Museum of Natural History, New York, USA), described Etia nguti, representing both a new genus and new species of cichlid from the River Mamfue, Upper Cross River basin in Cameroon. The specific name is from Nguti, the name of the village where most of the type series was collected. The generic name honors “E.T.,” whose “ground-breaking work on cichlid biology spanned some 60 years,” and whose “creativity, humility and kindness are legendary.” Note: Wikipedia inexplicably says “Etia” is from the indigenous Mbo language spoken in Nguti, meaning “located in,” and that the full epithet Etia nguti literally means “located in Nguti.” Wikipedia cites the original description, but I can assure you that is not the explanation provided by the authors.
PHOTO: Etia nguti, male, about 60 mm SL. Photo by Jörg Freyhof. From: Schliewen, U. K. and M. L. J. Stiassny. 2003. Etia nguti, a new genus and species of cichlid fish from the River Mamfue, Upper Cross River basin in Cameroon, West-Central Africa. Ichthyological Exploration of Freshwaters 14 (1): 61-71. Flávio Lima Her book on tilapiine cichlids is an unsurpassable piece of scholarship.