Cyclostrema stillicidiatum Yokoyama, 1922 † accepted as Microthyca crenellifera (A. Adams, 1862) (source of synonymy)
Microthyca A. Adams, 1863 (basis of record)
Microthyca aotearoa Raven, 2025 (original description)
Microthyca aupouria (A. W. B. Powell, 1937) (basis of record)
Microthyca australiana Raven, 2025 (original description)
Microthyca corrugata Raven, 2025 (original description)
Microthyca crenellifera (A. Adams, 1862) (basis of record)
Microthyca foliata Raven, 2025 (original description)
Microthyca laevis Thiele, 1925 (basis of record)
Microthyca magna Raven, 2025 (original description)
Microthyca marshalli Raven, 2025 (original description)
Microthyca norfolkensis Raven, 2025 (original description)
Moerchia arabica Raven, 2025 (original description)
Moerchia biplicata P. Fischer, 1877 (basis of record)
Moerchia corrugata Raven, 2025 (original description)
Moerchia deformata Rubio & Rolán, 2014 accepted as Moerchia morleti P. Fischer, 1877 (source of synonymy)
Moerchia intermedia (Thiele, 1925) (basis of record)
Moerchia introspecta Hedley, 1907 (basis of record)
Moerchia mariae Jousseaume, 1898 (status source)
Moerchia morleti P. Fischer, 1877 (basis of record)
Moerchia obvoluta A. Adams, 1860 (basis of record)
Moerchia perforata Rubio & Rolán, 2014 accepted as Moerchia biplicata P. Fischer, 1877 (source of synonymy)
Moerchia philippinensis Raven, 2025 (original description)
Moerchia zuluensis Raven, 2025 (original description)
Moerchiinae Raven, 2025 (original description)

Bass Strait for Microthyca australiana Raven, 2025 
Bruneian part of the South China Sea for Microthyca corrugata Raven, 2025 
Bruneian part of the South China Sea for Moerchia intermedia (Thiele, 1925) 
Bruneian part of the South China Sea for Moerchia morleti P. Fischer, 1877 
China Sea for Moerchia morleti P. Fischer, 1877 
Cocos-Keeling/Christmas Island for Microthyca foliata Raven, 2025 
Gulf of Aden for Moerchia arabica Raven, 2025 
Gulf of Aqaba for Moerchia arabica Raven, 2025 
Gulf of Suez for Moerchia arabica Raven, 2025 
Hong Kong for Moerchia intermedia (Thiele, 1925) 
Indonesian Exclusive Economic Zone for Microthyca corrugata Raven, 2025 
Indonesian Exclusive Economic Zone for Moerchia biplicata P. Fischer, 1877 
Indonesian Exclusive Economic Zone for Moerchia morleti P. Fischer, 1877 
Java for Moerchia intermedia (Thiele, 1925) 
Kuwaiti part of the Persian Gulf for Moerchia arabica Raven, 2025 
Langkawi for Microthyca corrugata Raven, 2025 
Lord Howe and Norfolk Islands for Microthyca norfolkensis Raven, 2025 
Lord Howe Rise for Microthyca marshalli Raven, 2025 
Maldives for Moerchia morleti P. Fischer, 1877 
Natal for Moerchia corrugata Raven, 2025 
Natal for Moerchia zuluensis Raven, 2025 
New South Wales for Microthyca australiana Raven, 2025 
New South Wales for Moerchia introspecta Hedley, 1907 
New Zealand Exclusive Economic Zone for Microthyca aotearoa Raven, 2025 
Norfolk Island Exclusive Economic Zone for Microthyca norfolkensis Raven, 2025 
Northern Territory for Moerchia introspecta Hedley, 1907 
Northern Territory for Moerchia morleti P. Fischer, 1877 
Papua New Guinean Exclusive Economic Zone for Microthyca corrugata Raven, 2025 
Papua New Guinean Exclusive Economic Zone for Moerchia morleti P. Fischer, 1877 
Philippine Exclusive Economic Zone for Microthyca magna Raven, 2025 
Philippine Exclusive Economic Zone for Moerchia biplicata P. Fischer, 1877 
Philippine Exclusive Economic Zone for Moerchia philippinensis Raven, 2025 
Queensland for Microthyca corrugata Raven, 2025 
Queensland for Moerchia morleti P. Fischer, 1877 
Sabah for Microthyca corrugata Raven, 2025 
Sabah for Moerchia morleti P. Fischer, 1877 
Sarawak for Microthyca corrugata Raven, 2025 
Sarawak for Moerchia biplicata P. Fischer, 1877 
Sarawak for Moerchia intermedia (Thiele, 1925) 
Sarawak for Moerchia morleti P. Fischer, 1877 
Seychelles for Moerchia arabica Raven, 2025 
Singapore for Microthyca corrugata Raven, 2025 
Singaporean Exclusive Economic Zone for Moerchia morleti P. Fischer, 1877 
Sri Lankan part of the Indian Ocean for Moerchia arabica Raven, 2025 
Sri Lankan part of the Indian Ocean for Moerchia intermedia (Thiele, 1925) 
Suez canal for Moerchia arabica Raven, 2025 
Taiwanese Exclusive Economic Zone for Moerchia obvoluta A. Adams, 1860 
Thailand Exclusive Economic Zone for Moerchia morleti P. Fischer, 1877 
Thailand Exclusive Economic Zone [Western part] for Moerchia intermedia (Thiele, 1925) 
United Arab Emirates part of the Persian Gulf for Moerchia arabica Raven, 2025 
Western Australia (state) for Microthyca corrugata Raven, 2025 
Western Australia (state) for Moerchia biplicata P. Fischer, 1877 
Western Australia (state) for Moerchia introspecta Hedley, 1907