Microcosmus is a genus of tunicates in the family Pyuridae, containing the following species:
- Microcosmus albidus <small>Michaelsen, 1904</small>
- Microcosmus anchylodeirus <small>Traustedt, 1883</small>
- Microcosmus anomalocarpus <small>Millar, 1988</small>
- Microcosmus arenaceus <small>Sluiter, 1904</small>
- Microcosmus australis <small>Herdman, 1898</small>
- Microcosmus bitunicatus <small>Monniot & Monniot, 2001</small>
- Microcosmus claudicans <small>(Savigny, 1816)</small>
- Microcosmus curvus <small>Tokioka, 1954</small>
- Microcosmus exasperatus <small>Heller, 1878</small>
- Microcosmus glacialis <small>(Sars, 1859)</small>
- Microcosmus hartmeyeri <small>Oka, 1906</small>
- Microcosmus helleri <small>Herdman, 1881</small>
- Microcosmus hernius <small>(Monniot & Monniot, 1973)</small>
- Microcosmus hirsutus <small>Sluiter, 1900</small>
- Microcosmus longicloa <small>Monniot & Monniot, 1991</small>
- Microcosmus madagascariensis <small>Michaelsen, 1918</small>
- Microcosmus miniaceus <small>Sluiter, 1900</small>
- Microcosmus multiplicatus <small>Tokioka, 1952</small>
- Microcosmus multitentaculatus <small>Tokioka, 1953</small>
- Microcosmus nudistigma <small>C. Monniot, 1962</small>
- Microcosmus oligophyllus <small>Heller, 1878</small>
- Microcosmus pacificus <small>Monniot & Monniot, 2001</small>
- Microcosmus planus <small>Kott, 1975</small>
- Microcosmus polymorphus <small>Heller, 1877</small>
- Microcosmus propinquus <small>Herdman, 1881</small>
- Microcosmus psammiferus <small>Monniot, Monniot, Griffiths & Schleyer, 2001</small>
- Microcosmus pupa <small>(Savigny, 1816)</small>
- Microcosmus sabatieri <small>Roule, 1885</small>
- Microcosmus santoensis <small>Monniot & Monniot, 2003</small>
- Microcosmus savignyi <small>Monniot, 1962</small>
- Microcosmus senegalensis <small>Michaelsen, 1915</small>
- Microcosmus squamiger <small>Michaelsen, 1927</small>
- Microcosmus stoloniferus <small>Kott, 1952</small>
- Microcosmus trigonimus <small>Millar, 1955</small>
- Microcosmus tuberculatus <small>Kott, 1985</small>
- Microcosmus vesiculosus <small>Monniot & Monniot, 2001</small>
- Microcosmus vulgaris <small>Heller, 1877</small>
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