List of Cosmarium taxa
- Cosmarium alpestre
- Cosmarium amoenum
- Cosmarium amstelodamense
- Cosmarium anceps
- Cosmarium anceps var. borgei
- Cosmarium angulare
- Cosmarium anisochondrum var. geminatum
- Cosmarium annulatum
- Cosmarium auriculatum
- Cosmarium bellum
- Cosmarium benedictum
- Cosmarium berryense
- Cosmarium binum
- Cosmarium bioculatum
- Cosmarium bipyrenoideum
- Cosmarium biretum
- Cosmarium biretum var. trigibberum
- Cosmarium blyttii
- Cosmarium boeckii
- Cosmarium boergesenii
- Cosmarium boitierense
- Cosmarium botrytis
- Cosmarium brebissonii
- Cosmarium capense var. nyassae
- Cosmarium cataractarum
- Cosmarium cinctutum
- Cosmarium circulare
- Cosmarium clepsydra
- Cosmarium commissurale
- Cosmarium connatoides
- Cosmarium connatum
- Cosmarium connatum var. africanum
- Cosmarium conspersum var. latum
- Cosmarium contractum
- Cosmarium contractum var. ellipsoideum
- Cosmarium contractum var. minutum
- Cosmarium corbula
- Cosmarium cosmetum
- Cosmarium costatum var. gutwinskii
- Cosmarium crassipelle var. champesianum
- Cosmarium cf. crenatum
- Cosmarium crenatum f.
- Cosmarium crenulatum
- Cosmarium cucumis var. magnum
- Cosmarium cunningtonii
- Cosmarium cymatonotophorum var. granulatum
- Cosmarium cymatopleurum
- Cosmarium davidsonii
- Cosmarium debaryi
- Cosmarium decedens var. minutum
- Cosmarium decoratum
- Cosmarium denboeri
- Cosmarium dentiferum var. alpinum
- Cosmarium depressum
- Cosmarium dickii
- Cosmarium didymoprotupsum
- Cosmarium difficile
- Cosmarium difficile var. messikommeri
- Cosmarium dilatatum
- Cosmarium distentum
- Cosmarium doidgei var. depressum
- Cosmarium eichlerianum
- Cosmarium elegantissimum
- Cosmarium elegantissimum f. minus
- Cosmarium excavatum var. duplo-maius
- Cosmarium fictopraemorsum
- Cosmarium fontigenum
- Cosmarium formosulum
- Cosmarium franzstonii var. subarcticum
- Cosmarium fruticosum
- Cosmarium fuelleborniforme
- Cosmarium furcatospermum
- Cosmarium galeatum
- Cosmarium glyptodermum
- Cosmarium goniodes
- Cosmarium goniodes var. subturgidum
- Cosmarium granatoides f.
- Cosmarium granatum
- Cosmarium haynaldii var. africanum
- Cosmarium haynaldii var. ambadiense
- Cosmarium hexalobum var. minus
- Cosmarium holmiense var. integrum
- Cosmarium holmii
- Cosmarium hornavanense
- Cosmarium humile
- Cosmarium humile var. substriatum
- Cosmarium impressulum
- Cosmarium isthmochondrum
- Cosmarium jaoi
- Cosmarium javanicum
- Cosmarium karibanum
- Cosmarium kirchneri
- Cosmarium klebsii
- Cosmarium laeve
- Cosmarium limnophilum
- Cosmarium lobatum
- Cosmarium luapulaense
- Cosmarium luxuriosum
- Cosmarium margaritatum
- Cosmarium margaritiferum
- Cosmarium medioretusum
- Cosmarium meneghinii
- Cosmarium microsphinctum
- Cosmarium moniliforme
- Cosmarium moniliforme var. panduriforme
- Cosmarium monomazum
- Cosmarium moremiense
- Cosmarium naivashensis
- Cosmarium nasutum
- Cosmarium nitidulum
- Cosmarium norimbergense var. depressum
- Cosmarium notabile
- Cosmarium novae-semliae var. sibiricum
- Cosmarium nymannianum
- Cosmarium obliquum
- Cosmarium obsoletum
- Cosmarium obtusatum
- Cosmarium ocellatum
- Cosmarium ochthodes
- Cosmarium okavangicum
- Cosmarium ornatum
- Cosmarium orthostichum
- Cosmarium ovale
- Cosmarium pachydermum
- Cosmarium pachydermum var. aethiopicum
- Cosmarium pachydermum var. sudanense
- Cosmarium paragranatoides
- Cosmarium parvulum
- Cosmarium perforatum
- Cosmarium pericymatium
- Cosmarium pericymatium var. corrugatum
- Cosmarium permaculatum
- Cosmarium pokornyanum
- Cosmarium portianum
- Cosmarium praecisum f.
- Cosmarium praegrande
- Cosmarium praemorsum
- Cosmarium protractum
- Cosmarium protumidum
- Cosmarium pseudoconnatum
- Cosmarium pseudodifficile
- Cosmarium pseudoinsigne
- Cosmarium pseudonitidulum
- Cosmarium pseudoornatum
- Cosmarium pseudoprotuberans
- Cosmarium pseudopyramidatum
- Cosmarium pseudoretusum
- Cosmarium pseudotus
- Cosmarium pseudowembaerense
- Cosmarium punctulatum var. subpunctulatum
- Cosmarium pygmaeum
- Cosmarium pyramidatum
- Cosmarium pyramidatum f.
- Cosmarium pyramidatum var. stephani
- Cosmarium quadratum
- Cosmarium quadratum f.
- Cosmarium quadrum
- Cosmarium quinarium
- Cosmarium raciborskii
- Cosmarium raeticum
- Cosmarium ralfsii
- Cosmarium rectangulare
- Cosmarium refringens
- Cosmarium regnellii
- Cosmarium regnesi
- Cosmarium reniforme
- Cosmarium reniforme var. compressum
- Cosmarium retusum
- Cosmarium rostafinskii
- Cosmarium scutiforme
- Cosmarium septentrionale
- Cosmarium sexnotatum
- Cosmarium sexnotatum var. bipunctatum
- Cosmarium simplicius
- Cosmarium sinostegos var. obtusius
- Cosmarium speciosum
- Cosmarium sphagnicolum
- Cosmarium sphyrelatum
- Cosmarium sportella
- Cosmarium striolatum
- Cosmarium subadoxum
- Cosmarium subbroomei f. isthmochondrum
- Cosmarium subcostatum var. beckii
- Cosmarium subcostatum var. minus
- Cosmarium subcrenatum
- Cosmarium subcucumis
- Cosmarium subexcavatum var. ordinatum
- Cosmarium subgranatum
- Cosmarium subligoniforme
- Cosmarium suborthogonum
- Cosmarium subprotumidum
- Cosmarium subprotumidum var. pyramidale
- Cosmarium subquadrans
- Cosmarium subquadrans var. minor
- Cosmarium subspeciosum var. validius
- Cosmarium subtumidum
- Cosmarium subundulatum
- Cosmarium sumatranum
- Cosmarium superbum
- Cosmarium taxichondriforme
- Cosmarium taxichondrum
- Cosmarium tetrachondrum f.
- Cosmarium tetraophthalmum
- Cosmarium thwaitesii
- Cosmarium tinctum
- Cosmarium tithophorum
- Cosmarium trachypleurum var. minus
- Cosmarium transitorium
- Cosmarium triplicatum
- Cosmarium tuddalense
- Cosmarium turpinii
- Cosmarium tyrolicum
- Cosmarium ungerianum
- Cosmarium varsoviense
- Cosmarium varsoviense var. latum
- Cosmarium venustum var. excavatum
- Cosmarium vexatum
- Cosmarium vossenbergense
- Cosmarium wenmanae
- Cosmarium wittrockii