Ernst Gustav Gotthelf Marcus, German-born Jewish Brazilian zoologist (Berlin 08 June 1893 – São Paulo 30 June 1968)

World authority on Mollusca Opisthobranchia, Bryozoa and Turbellaria

Authored over 215 works

Studied bryozoans, oligochaetes, pycnogonids, pantopods, ctenophores, tardigrades, turbellarians, mollusks, nemertineans and onychophores  

Discovered and described Class Heterotardigrada (1927)

DESCRIBED NEW TAXA 

Turbellaria

Families

Chordariidae 1945

Gnesioceratidae 1966

Scleraulophoridae 1950

Taenioplanidae 1966

Theamatidae 1949

Urostomatidae 1951

Urostomidae 1951 

Genera

63

Species

With E. Marcus described over 300 marine species

Mollusca

Genera

Awuka 1955

Felimare 1967 (with Eveline) 

Ganitus 1953

Inuda 1967 (with Eveline)

Lapinura 1970 (with Eveline)

Miesea 1961

Mourgona 1970 (with Eveline)

Muessa 1965

Nanuca 1957

Njurja 1959 (with Eveline)

Nuvuca 1967 (with Eveline)

Pinufius 1959 (with Eveline)

Piseinotecus 1955

Pleurehdera 1970 (with Eveline)

Pluscula 1953 (with Eveline)

Sapha 1959

Sebadoris 1959 (with Eveline)

Siraius 1955

Taringa 1955

Tayuva 1967 (with Eveline)

Uneba 1953

Species

222 in Mollusca Opisthobranchia

Bryozoa

Genera

Aeverrillia 1941

Crisevia 1937

Euteleia 1938

Haplota 1940

Sangavella 1957

Utinga 1949

Annelida

Genera

Jolydrilus 1965

Wapsa 1965

Protozoa

Genus

Sawayaella 1939

HONORS

Marcusia Hyman 1953 (Turbellaria)

Marcusiaxius Carvalho & Rodrigues 1973 (Crustacea)

Marcusadorea Vieira, Migotto & Winston 2010 (Cnidaria)  

Marcusopora Pohowsky 1978 (Fossil Bryozoa) 

Subgenus Marcusiella Luther 1955 (Turbellaria)

His wife, Eveline Agnes du Bois-Reymond Marcus, German-born Brazilian invertebrate zoologist (Berlin 06 October 1901 – São Paulo 31 January 1990)

Famous physiologist Emil du Bois-Reymond was her relative 

Discovered the accessory vessel of Phoronids (1949) 

DESCRIBED NEW TAXA

Mollusca

Family

Bosellidae 1982

Genera

Ascobulla 1972

Dondice 1958

Felimare 1967 (with Ernst) 

Felimida 1971 (With Ernst)

Inuda 1967 (with Ernst) 

Lapinura 1970 (with Ernst)

Macfarlandaea 1984 with Gosliner 

Mourgona 1970 (with Ernst)

Mysouffa 1974 

Njurja 1959 (with Ernst) 

Nuvuca 1967 (with Ernst)  

Pattyclaya 1982

Percunas 1970

Pinufius 1959 (with Ernst) 

Pleurehdera 1970 (with Ernst) 

Pluscula 1953 (with Ernst) 

Roburnella 1982

Sebadoris 1959 (with Ernst) 

Tayuva 1967 (with Ernst)

Tornastra 1977 

Species

222 in Mollusca Opisthobranchia

Turbellaria

Genera

Amyris 1968  (with Ernst) 

Igluta 1968 (with Ernst) 

Puiteca 1955

Pupsikus 1970 (with Ernst)

Toia 1952 

Yagua 1958

Tardigrada

Genera

Bryochoerus 1936

Orzeliscus 1952

Mopsechiniscus 1944

Annelida

Genus

Siolidrilus 1949

Nemertea

Genus

Siolineus 1948

HONORS

Marcusaedrilus Righi & Kanner 1979 (Annelida Oligochaeta) 

Marcusiola Steinböck 1966 (Turbellaria)

Emarcusia Roller 1972 (Mollusca) 

Evelineus Correa 1954 (Nemertea)