- nabaensis, Tosapecten
- nagahamaensis, Tapes
- nagaii, Dosinia
- nagaiwaensis, Chaetetes
- naganumana, Paphia
- naganumana, Yoldia
- naganumanus, Pecten
- naganumanus, Pecten albicans
- nagaoi, Acila
- nagaoi, Nuculana
- nagaoi, Saccella
- Nagatoella, genus
- nagatoensis, Aguilerella (Yoshimopsis)
- nagatoensis, Bakevellia
- nagatoensis, Bakevelloides (Yoshimopsis)
- Nagatophyllum, genus
- naguraense, Miosesarma
- naitoi, Cycadocarpidium
- nakakuboensis, Tangshanella
- nakaminatoense, Didymoceras
- nakaminatoensis, Nipponaster
- nakamurai, Cernina
- nakamurai, Clementia
- nakamurai, Globularia
- nakamurai, Glycymeris
- nakamurai, Izuus
- nakamurai, Miodontiscus
- nakamurai, Miodontiscus prolongatus
- nakamurai, Nipponomarcia
- nakatsugawaensis, Parentactinia
- nakazimai, Acila
- nakazimai, Truncacila
- nakosoensis, Glycymeris
- nakosoensis, Mizuhopecten kimurai
- nakosoensis, Patinopecten kimurai
- namadicus aomoriensis, Palaeoloxodon
- namadicus naumanni, Palaeoloxodon
- namadicus yabei, Palaeoloxodon
- nana, Crassatella
- nanae, Lampadena
- nana, Eucrassatella
- nana, Nipponocrassatella
- Nanaochlamys notoensis
- Nanaochlamys notoensis otutumiensis
- Nankinella, genus
- Nannobrachium regale
- Nanonavis, genus
- Nanonavis yokoyamai
- nanus, Crassatellites
- Napora, genus
- Napora wakitai
- Naria, genus
- nariwaensis, Hausmannia
- nariwaensis, Sagenopteris
- nariwensis, Equisetites
- Narrow slot limpet
- Nassa denselineata
- Nassa mud snail
- Nassaria magnifica
- Nassaria magnifica yokoyamai
- Nassarius, genus
- Nassarius bellulus
- Nassarius caelatus
- Nassarius castus
- Nassarius conoidalis
- Nassarius denselineatus
- Nassarius festiva
- Nassarius fuscolineatus
- Nassarius japonicus
- Nassarius kometubus
- Nassarius livescens
- Nassarius minoensis
- Nassarius (Plicarcularia) bellulus
- Nassarius praematuratus
- Nassarius simizui
- Nassarius siquijorensis
- Nassarius variegatus
- Nassarius (Zeuxis) caelatus
- Nassarius (Zeuxis) siquijorensis
- natans, Trapa
- natans var. pumila, Trapa
- nathorsti, Betula
- nathorsti, Fagus
- nathorsti, Ginkgoidium
- nathorstii, Cyclobalanopsis
- nathorstii, Ginkgoidium
- nathorstii, Quercus
- nathorsti, Machilus
- Natica, genus
- Natica (Amauropsis) sanchuensis
- Natica clausa tugaruana
- Natica (Cryptonatica) clausa tugaruana
- Natica janthostomoides
- Natica russa
- Natica sanchuensis
- Natica severa
- Naticella, genus
- Naticella japonica
- Naticidae, family
- Naticopsis, genus
- Naticopsis minoensis
- Naticopsis wakimizui
- natsumei, Cervus
- naumanni, Comptonia
- naumanni, Comptoniphyllum
- naumanni, Cyrena
- naumanni, Elephas
- naumanni, Hayamina
- naumanni, Lima
- naumanni, Palaeoloxodon
- naumanni, Palaeoloxodon namadicus
- naumanni, Protocyprina
- naumanni, Polymesoda
- Nautiloid
- NautiloideaˆŸ–Ô
- Naumann's elephant
- Navicula, genus
- Navicula bacillum
- navicula, Entodesma
- Navicula jentzschii
- navicula, Neogondolella
- navicula, Paragondolella
- Navicula placentula f. rostrata
- Navicula radiosa
- Navicula scutelloides
- Navicula smithii f. smithii
- Navicula turgida
- Navicula tuscula
- Navicula zebra
- naviculoides, Entodesma
- Nazarovella, genus
- neastartoides, Gomphina
- nebbensis, Cladophlebis
- negaprion, genus
- Negaprion acanthodon
- Neithea atava
- Neithea atavus
- Neihea nipponica
- Neilonella, genus
- Neilonella isensis
- Nelumbo, genus
- Nelumbo nipponica
- Nelumbo nipponicus
- Nelumbo orientalis
- Nemegtosauridae, family
- Nemocardium, genus
- Nemocardium samarangae
- Nemotaulius admorsus
- nenokamiensis, Basilissa (Orectospira)
- nenokamiensis, Lutraria
- nenokamiensis, Orectospira
- Neobakevellia shinanoensis
- Neobakevellia trigona
- Neocalamites, genus
- Neocalamites carrerei
- Neocalamites hoerensis
- Neocalamites minensis
- Neocallichirus nishikawai
- Neochonetes, genus
- Neoconularia rectangularis
- neodiminuta, Cocconeis
- Neofusulinella, genus
- Neogaudryceras tenuiliratum
- Neogloboquadrina dutertrei
- Neogloboquadrina incompta
- Neogloboquadrina pachyderma
- Neogondolella, genus
- Neogondolella bulgarica
- Neogondolella idahoensis
- Neogondolella navicula
- Neohaustator andenensis
- Neohaustator fortilirata
- Neohaustator fortilirata nojimaensis
- Neohaustator nipponica
- Neohindeodella, genus
- Neoiphinoe unicarinata
- Neokoninckophyllum nipponense
- Neolitsea aciculata
- neolongicaudata, Paracytheridea
- Neomillerella yowarensis
- Neonesidea, genus
- Neophocaena, genus
- Neophylloceras, subgenus
- Neophylloceras subramosum
- Neopycnodonte, genus
- neornatum, Dentalium
- Neoschwagerina, genus
- Neoschwagerina akasakensis
- Neoschwagerina (Cancellina) nipponica
- Neoschwagerina colaniae
- Neoschwagerina craticulifera
- Neoschwagerina delicata
- Neoschwagerina fuwensis
- Neoschwagerina margaritae
- Neoschwagerina minoensis
- Neoschwagerina muratai
- Neoschwagerina nipponica
- Neoschwagerina okuboi
- Neoschwagerina rotunda
- Neoschwagerina sakaguchii
- Neoshirakia japonica
- Neospathodus, genus
- Neospirifer, genus
- Neostylidium horinjiense
- Neotrapezium liratum
- nepenthes, Globigerina
- nepenthes, Globoturborotalita
- Nephrolepidina, genus
- Nephrolepidina angulosa
- Nephrolepidina japonica
- Nephrolepidina nipponica
- Nephrolepidina scabra
- Neptunea, genus
- Neptunea arthritica
- Neptunea constricta
- Neptunea dispar
- Neptunea eos
- Neptunea hukusimensis
- Neptunea hukusimensis matumori
- Neptunea intersculpta
- Neptunea koromogawana
- Neptunea matumori
- Neptunea modesta
- Neptunea sakurai
- Neptunea uwasoensis
- Neptunea vinosa
- Neptunea yokoyamai
- Nerinea, genus
- Nerinea rigida
- Neritopsis, genus
- Neverita, genus
- Neverita asagaiensis
- Neverita coticazae
- Neverita didyma
- Neverita didyma coticazae
- Neverita (Glossaulax) didyma
- Neverita kiritaniana
- Neverita reiniana
- nexilis, Enalaster
- nexilis, Heteraster
- niagarae, Stephanodiscus
- Nicrophorus concolor
- nigricosta, Terpnosia
- nihei-takagii, Cladophlebis
- Nihonotrypaea japonica
- Nikko fir
- Nikko maple
- nikobarensis, Lenticulina
- nikobarensis, Robulus
- nikoense, Acer
- nikoensis, Betula
- Nilssonia, genus
- Nilssonia asuwensis
- Nilssonia densinervis
- Nilssonia glossoformis
- Nilssonia nipponensis
- Nilssonia orbiculata
- Nilssonia orientalis
- Nilssonia parvula
- Nilssonia sachalinensis
- Nilssonia schaumburgensis var. parvula
- Nilssonia serotina
- ninohensis, Anadara
- ninohensis, Meretrix
- Niotha, genus
- Niotha livescens
- nipalensis subsp. orientalis, Nisaetus
- nipalensis subsp. orientalis, Spizaetus
- niponica, Ennucula
- Nipponacmea, genus
- nippona, Crassostrea
- nippona, Magallana
- Nipponamia satoi
- Nipponarca bistrigata
- Nipponaster nakaminatoensis
- nippon, Cervus
- nipponense, Neokoninckophyllum
- nipponensis, Azumapecten farreri
- nipponensis, Crassatella
- nipponensis, Dasyatis
- nipponensis, Gymnura
- nipponensis, Nilssonia
- nipponica, Ammonia
- nipponica, Betula
- nipponica, Calyptogena
- nipponica, Cancellina
- nipponica, Cedrela
- nipponica, Conchocele
- nipponica, Cooperina
- nipponica, Ennucula
- nipponica, Euconospira
- nipponica, Glycymeris
- nipponica, Hanzawaia
- nipponica, Haustator
- nipponica, Lepidocyclina
- nipponica, Linthia
- nipponica, Macoma
- nipponica, Mactra
- nipponica, Mauremys
- nipponica, Neihea
- nipponica, Nelumbo
- nipponica, Neohaustator
- nipponica, Neoschwagerina
- nipponica, Nephrolepidina
- nipponica nojimaensis, Turritella
- nipponica nomurai, Turritella
- nipponica, Prunus
- nipponica, Rotalia
- nipponica. Sabal
- nipponica, Thyasira bisecta
- nipponica, Turritella
- nipponica, Venericardia
- Nipponicervus, genus
- Nipponicervus kazusensis
- Nipponicervus praenipponicus
- nipponicum, Eudolium
- nipponicum, Musophyllum
- nipponicum, Protogrammoceras
- nipponicus, Dicerorhinus
- nipponicus, Iquius
- nipponicus, Metanothosaurus
- nipponicus, Molopopholus
- nipponicus, Nelumbo
- nipponicus, Nyctereutes vivverrinus
- nipponicus, Paliurus
- nipponicus, Sabalites
- nipponicus, Ulmus
- Nipponites, genus
- Nipponites bacchus
- Nipponites mirabilis
- Nipponithyris subovata
- Nipponitrigonia, genus
- Nipponitrigonia kikuchiana
- Nipponoclava gigantea
- Nipponoclava yokoyamai
- Nipponocrassatella, genus
- Nipponocrassatella nana
- Nipponocypris, genus
- Nipponodorcus rubrofemoratus
- Nipponomarcia, genus
- Nipponomaria yokoyamai
- Nipponomarcia nakamurai
- Nipponomysella, genus
- Nippononaia ryosekiana
- Nipponopecten akihoensis
- Nipponopecten protomollitus
- Nipponopecten wakuyaensis
- Nipponophycus, genus
- Nipponophycus ramosus
- Nipponotrophon, genus
- nippon subsp. yesoensis, Cervus
- Nisaetus nipalensis subsp. orientalis
- nisataiensis, Chlamys
- nishikawai, Callianassa
- nishikawai, Neocallichirus
- nishiwadai, Lithophyllum
- nishimotoi, Tholitoma
- nishimurai, Athleta
- Nitidotellina, genus
- Nitidotellina lischkei
- Nitidotellina minuta
- Nitzschia amphibia
- Nitzschia punctata
- Niveotectura, genus
- Niveotectura pallida
- nobilis, Puncturella
- Nodella pexa
- Noditerebra osawanoensis
- Noditerebra (Pristiterebra) tsuboiana
- Noditerebra tsuboiana
- Nodobaculariella, genus
- Nododelphinula elegans
- Nodosarella, genus
- Nodosaria, genus
- Nodosaria radicula
- nodosa, Trachydomia
- Nodosaurus, genus
- Nodularia douglasiae ssp. biwae
- nodulifera, Cancellaria
- nodulifera, Habesolatia
- noguchii, Fulgoraria
- nojimaensis, Neohaustator fortilirata
- nojimaensis, Turritella nipponica
- nomurae, Panopea
- nomurai, Dosinia
- nomurai, Dosinia japonica
- nomurai, Phacosoma
- nomurai, Placopecten
- nomurai, Turritella
- nomurai, Turritella nipponica
- nonakai, Phacops
- nonakai, Reedops
- Nonbiting midge
- Nonion, genus
- Nonion commune
- Nonionella, genus
- Nonionella japonica
- Nonionellina labradorica
- Nonion fabum
- Nonion japonicum
- Nonion manpukujiense
- Nonion manpukuziensis
- Nonion scaphum
- norcrossi, Islandiella
- nordenskioeldi, Acer
- Northern astarte
- Northern divaricated nut clam
- Northern great tellin
- Northern Japanese hemlock
- Northern moon snail
- Northwest territory sedge
- notabilis, Cnesterium
- notabilis, Yoldia
- Notacurites, genus?
- Notoacmea sigaramiensis
- Notochione jedoensis
- Notocyathus orientalis
- Notocyathus (Paradeltocyathus) orientalis
- notoensis, Calocedrus
- notoensis, Elaeocarpus
- notoensis, Fabulina
- notoensis, Haliotis
- notoensis, Libocedrus
- notoensis, Milletia
- notoensis, Nanaochlamys
- notoensis otutumiensis, Nanaochlamys
- notoensis, Perrottetia
- notoensis, Potamides
- notoensis, Tellina
- notoensis, Vicaryella
- notoensis, Wisteria
- Notophyllia japonica
- Notopus, genus
- Notovola, genus
- Novixitus, genus
- Nucella, genus
- Nucella freycinetii
- Nucella freycinetii subsp. alabaster
- Nucella yatsuoensis
- Nucula, genus
- Nucula hizenensis
- Nuculana, genus
- Nuculana confusa
- Nuculana confusa kongiensis
- Nuculana confusa sematensis
- Nuculana magarikawaensis
- Nuculana nagaoi
- Nuculana (Nuculana) onoyamai
- Nuculana (Nuculana) yokoyamai
- Nuculana onoyamai
- Nuculana pernula
- Nuculana pernula sadoensis
- Nuculana pernuloides
- Nuculana robai
- Nuculana sadoensis
- Nuculana (Thestyleda) yokoyamai
- Nuculana yokoyamai
- Nuculanidae, family
- nudata, Guexella
- Nude thorny oyster
- Nummulites, genus
- Nummulites baguelensis
- Nuphar, genus
- Nuttallia, genus
- Nuttallia ezonis
- nuttallii, Clinocardium
- Nuttall's cockle
- nux subsp. sematensis, Cryptopecten