Planus

Planus is a surname of French origin. People with that name include:
 * Marc Planus (born 1982), French footballer
 * Pierre Planus (born 1979), French footballer

Planus is a Latin adjective meaning "flat" or "plain". It is part of the binomial name of several species, and of some other combination terms.
 * Personal honorific or nickname
 * Doctor Planus et utilis, a scholastic accolade awarded to the Franciscan teacher Nicholas of Lyra (c. 1270–1349)
 * In biology
 * Agrypnus planus, a species of click beetle in the genus Agrypnus
 * Aneflus planus, a species of beetle in the family Cerambycidae
 * Argopatagus planus, a species of sea urchin of the family Macropneustidae
 * Blissus planus, a species of true bug in the genus Blissus in the family Blissidae
 * Botrylloides planus, a synonym of Botryllus planus
 * Botryllus planus, a species of colonial ascidian tunicate in the genus Botryllus in the family Styelidae
 * Brachys planus, a species of beetle in the genus Brachys in the family Buprestidae
 * Bransatoglis planus, an extinct species of dormouse
 * Brochocoleus planus, a species of beetle in the genus Brochocoleus in the family Ommatidae
 * Callionymus planus, a species of dragonet native to the shallow Pacific waters off southern Japan
 * Camponotus planus, a species of carpenter ant; see List of Camponotus species
 * Canthyporus planus, a species of beetle in the genus Canthyporus in the family Dytiscidae
 * Carabus perrini planus, a subspecies of beetle in the family Carabidae
 * Carabus planus, a synonym of Pheropsophus aequinoctialis, a ground beetle
 * Caracara planus, the crested caracara (also known as the carancho), a bird of prey in the family Falconidae
 * Catogenus planus, a species of beetle in the genus Catogenus in the family Passandridae
 * Cheliferoides planus, a species of spider in the genus Cheliferoides
 * Cleptomartus planus, a synonym of Anthracomartus hindi, an extinct species of arachnid in the genus Anthracomartus in the family Anthracomartidae
 * Coccophagus planus, a species of chalcid wasp in the genus Coccophagus
 * Copodus planus, an extinct species of cartilaginous fish; see List of prehistoric cartilaginous fish genera
 * Corax planus, an extinct species of shark in Corax (genus)
 * Craspedites planus, an extinct species of ammonoid cephalopod in the genus Craspedites
 * Dermestes planus, a species of beetle in the genus Dermestes in the family Dermestidae
 * Dicynodon planus, a synonym of Oudenodon bainii, an extinct dicynodont in the genus Oudenodon
 * Distichus planus, a species of beetle in the genus Distichus in the family Carabidae
 * Epicadus planus, a species of spider in the genus Epicadus in the family Thomisidae; see List of Thomisidae species
 * Eucastor planus, an extinct species of beaver found in the Hawthorn Group
 * Ferganosuchus planus, the type species of Ferganosuchus, an extinct genus of gavialid crocodilian
 * Gonicoelus planus, a species of beetle in the genus Gonicoelus in the family Biphyllidae
 * Grynobius planus, a species of beetle in the family Anobiidae
 * Heteroscyphus planus, a species of Marchantiophyta (liverwort)
 * Hoplobunus planus, a species of harvestman in the family Stygnopsidae
 * Hyalodiscus planus, a species of diatom in the genus Hyalodiscus
 * Hydroporus planus, a species of water beetle in the genus Hydroporus
 * Ischyodus planus, an extinct species of cartilaginous fish in the genus Ischyodus
 * Isurus planus, also known as the hook-tooth mako, an extinct mako shark that lived during the Miocene epoch
 * Larinus planus, a species of true weevil
 * Leptodius planus, a species of crab in the genus Leptodius in the family Xanthidae
 * Leptotrachelus planus, a species in the genus Leptotrachelus (beetle) in the family Carabidae
 * Lionychus planus, a species of beetle in the genus Lionychus in the family Carabidae
 * Metacyclops planus, a species of copepod crustacean in the genus Metacyclops in the family Cyclopidae
 * Microcosmus planus, a species of Microcosmus, a genus of tunicates in the family Pyuridae
 * Oesyperus planus, a species of beetle in the genus Oesyperus in the family Carabidae
 * Pachyscelus planus, a species of beetle in the genus Pachyscelus in the family Buprestidae
 * Palaeospheniscus planus, incorrect name for the extinct species of penguin Palaeospheniscus bergi
 * Pandanus planus, a synonym of Pandanus tectorius, a species of screwpine
 * Penestomus planus, a species of spider in the genus Penestomus
 * Philodromus planus, a species of philodromid crab spider in the genus Philodromus in the family Philodromidae; see List of Philodromidae species
 * Philophlaeus planus, a species of beetle in the genus Philophlaeus in the family Carabidae
 * Polydesmus planus, a species of millipede in the genus Polydesmus
 * Protorabus planus, a species of beetle in the subfamily Protorabinae in the family Carabidae
 * Psellonus planus, a species of spider in the genus Psellonus in the family Philodromidae; see List of spiders of India
 * Pseudaspidites planus, an extinct species of mollusc in the genus Pseudaspidites; see 2012 in molluscan paleontology
 * Pseudoparasitus planus, a species of mite in the genus Pseudoparasitus
 * Pseudospheniscus planus, incorrect name for the extinct species of penguin Palaeospheniscus bergi
 * Pterostichus planus, a species of ground beetle in the genus Pterostichus
 * Pyrnus planus, a species of spider in the genus Pyrnus in the family Trochanteriidae; see List of Trochanteriidae species
 * Rhipicephalus planus, a species of tick in the genus Rhipicephalus in the family Ixodidae
 * Senoculus planus, a species of spider in the genus Senoculus in the family Senoculidae
 * Sigaretornus planus, a species in the genus Tornus (gastropod)
 * Smerinthus planus, The oriental eyed hawkmoth, a moth of the family Sphingidae
 * Sphenodus planus, an extinct species of shark in the genus Sphenodus in the family Orthacodontidae
 * Styloniscus planus, a species of woodlouse in the genus Styloniscus
 * Syngonanthus planus, a species of plant in the genus Syngonanthus in the family Eriocaulaceae
 * Tornus planus, a synonym of Sigaretornus planus
 * Trachelas planus, a species of spider in the genus Trachelas in the family Trachelidae; see List of Trachelidae species
 * Trochus planus, a synonym of Bembicium nanum, a species of sea snail
 * Vetustodermis planus, a soft-bodied middle Cambrian animal, a species in the genus Vetustovermis
 * Wilcoxius planus, a species of robber fly (or, assassin fly) in the genus Wilcoxius in the family Asilidae; see List of Asilidae species: W
 * Other uses
 * Cantus planus, Latin for plainsong (or, plainchant), a body of chants used in the liturgies of the Western Church
 * Lichen planus, a disease of the skin and/or mucous membranes that resembles lichen
 * Pes planus, a medical term for flat feet (or, fallen arches), a postural deformity in which the arches of the foot collapse