As of July 2016, the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of nat ...

(IUCN) lists 5278 data deficient

invertebrate Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...

species. 29% of all evaluated invertebrate species are listed as data deficient. The IUCN also lists 57 invertebrate subspecies as data deficient. No subpopulations of invertebrates have been evaluated by the IUCN. This is a complete list of data deficient invertebrate species and subspecies as evaluated by the IUCN.

Nemertea Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of 1300 known species. Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many h ...
species

*'' Argonemertes stocki''

Annelids The annelids (Annelida , from Latin ', "little ring"), also known as the segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecolog ...

Onychophora Onychophora (from grc, ονυχής, , "claws"; and , , "to carry"), commonly known as velvet worms (due to their velvety texture and somewhat wormlike appearance) or more ambiguously as peripatus (after the first described genus, '' Peripatus ...

*''

Mesoperipatus tholloni ''Mesoperipatus'' is a monospecific genus of velvet worm in the Peripatidae family, containing a single species ''Mesoperipatus tholloni''. It is found in Gabon, making it the only known species of velvet worm in the tropics of Africa, and the on ...

Molluscs Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estim ...

There are 1988 mollusc species and 40 mollusc subspecies assessed as data deficient.

Gastropods The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. The ...

There are 1526 gastropod species and 37 gastropod subspecies assessed as data deficient.

Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouchet ...

*'' Teinostoma fernandesi'' *'' Teinostoma funiculatum''

Stylommatophora

Stylommatophora includes the majority of land snails and slugs. There are 392 species and 32 subspecies in the order Stylommatophora assessed as data deficient.

= Partulids

= Subulinids

= Species Subspecies *'' Opeas nothapalinus crenatum'' *'' Pseudoglessula leroyi fasciata''

= Achatinellids

= Endodontids

= Charopids

= Helicarionids

= Orthalicids

= Euconulids

= Rhytidids

= Streptaxids

= Species Subspecies

= Zonitids

= Pupillids

= Polygyrids

= Species Subspecies

= Helminthoglyptids

= Species * Shasta sideband (''Monadenia troglodytes'') Subspecies

= Camaenids

= Lauriids

= Vertiginids

= Bradybaenids

= Species Subspecies *'' Euhadra scaevola mikawa''

= Helicids

= Hygromiids

= Enids

=Other Stylommatophora

= Species Subspecies * Idaho banded mountain snail (''Oreohelix idahoensis idahoensis'') * Carinated striate banded mountain snail (''Oreohelix strigosa goniogyra'')

Littorinimorpha Littorinimorpha is a large order of snails, gastropods, consisting primarily of sea snails (marine species), but also including some freshwater snails ( aquatic species) and land snails ( terrestrial species).Bouchet P. & Rocroi J.-P. (Ed.); Frý ...

There are 565 species and one subspecies in the order Littorinimorpha assessed as data deficient.

= Strombids

= *'' Ophioglossolambis violacea''

= Pomatiids

= Hydrobiids

= Cochliopids

= Bithyniids

= Species Subspecies *'' Gabbiella humerosa tanganyicensis''

= Moitessieriids

= Assimineids

= Pomatiopsids

= Lithoglyphids

= Amnicolids

= Stenothyrids

= Iravadiids

= Truncatellids

Sorbeoconcha Sorbeoconcha is a taxonomic clade of snails, i.e. gastropods, mainly marine species with gills and opercula, within the clade Caenogastropoda. The taxon Sorbeoconcha was named by Winston Ponder and David R. Lindberg in 1997. Taxonomy 1 ...

There are 97 species and one subspecies in the order Sorbeoconcha assessed as data deficient.

= Batillarids

= *''

Batillaria mutata ''Batillaria mutata'' is a species of small mudflat saltwater snail, a marine gastropod mollusk in the family Batillariidae, the horn snails. Distribution This species is endemic to Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ...

= Pleurocerids

= Melanopsids

= Semisulcospirids

= * Oasis juga (''Juga laurae'')

= Thiarids

= Pachychilids

= Paludomids

= Species Subspecies *'' Cleopatra bulimoides pauli''

Architaenioglossa

There are 106 species and one subspecies in the order Architaenioglossa assessed as data deficient.

= Neocyclotids

= Cyclophorids

= Species Subspecies *'' Chamalychaeus itonis nakashimai''

= Pupinids

= Diplommatinids

= Aciculids

= Viviparids

= Ampullariids

Lower Heterobranchia Lower Heterobranchia, also known as the Allogastropoda, is a group of rather specialized, highly evolved sea slugs and sea snails, ( marine gastropod mollusks) within the subclass Heterobranchia. WoRMS (2020). "Lower Heterobranchia". Accessed at ...
species

Cycloneritimorpha

There are 30 species and two subspecies in the order Cycloneritimorpha assessed as data deficient.

= Helicinids

= Species Subspecies *'' Pleuropoma zigzac ponapense'' *'' Pleuropoma zigzac zigzac''

= Hydrocenids

= Neritids

Hygrophila species

There are 197 Hygrophila species assessed as data deficient.

= Physids

= Acroloxids

= Planorbids

= Lymnaeids

= Chilinids

= Latiids

= *'' Latia lateralis''

Neogastropoda

There are 113 species in the order Neogastropoda assessed as data deficient.

= Turrids

= Marginellids

= Buccinids

= Muricids

= Conids

Eupulmonata Eupulmonata is a taxonomic clade of air-breathing snails. The great majority of this group are land snails and slugs, but some are marine and some are saltmarsh snails that can tolerate salty conditions. Linnean taxonomy *Suborder Eupulmonat ...

Archaeopulmonata

*'' Salinator sanchezi'' *'' Salinator swatowensis''

Bivalvia Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, biva ...

There are 171 species and three subspecies in the class Bivalvia assessed as data deficient.

Pectinida Pectinida is a taxonomic order of large and medium-sized saltwater clams, marine bivalve molluscs, commonly known as scallops and their allies. It is believed that they began evolutionarily in the late Middle Ordovician epoch; many species, of ...

*''

Nodipecten magnificus ''Nodipecten magnificus'' is a species of bivalve in the family Pectinidae. It is endemic to Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ''Ecuador'' or ''Ekuatur''), officially the Republic of Ecuador ( es, República del Ecuad ...

Unionida Unionida is a monophyletic order of freshwater mussels, aquatic bivalve molluscs.Bieler R., Carter J.G. & Coan E.V. (2010). ''Classification of Bivalve families''. pp. 113–133, in: Bouchet P. & Rocroi J.-P. (2010), ''Nomenclator of Bivalve Fa ...

There are 95 species in the order Unionoida assessed as data deficient.

= Margaritiferids

= *'' Margaritifera dahurica'' *'' Margaritifera laevis''

= Unionids

= Hyriids

= Iridinids

= Mycetopodids

= *'' Anodontites elongatus'' *'' Anodontites trigonus''

Veneroida

There are 74 species and three subspecies in the order Veneroida assessed as data deficient.

= Donacids

= Solecurtids

= *'' Novaculina siamensis''

Mytilida

*'' Sinomytilus morrisoni''

Cephalopods

There are 291 cephalopod species assessed as data deficient.

Idiosepiida

Octopuses An octopus ( : octopuses or octopodes, see below for variants) is a soft-bodied, eight- limbed mollusc of the order Octopoda (, ). The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, ...

There are 34 octopus species assessed as data deficient.

= Umbrella octopuses

= Argonautids

= *'' Argonauta cornuta''

= Cirroteuthids

=
Grimpoteuthis ''Grimpoteuthis'' is a genus of pelagic umbrella octopuses known as the dumbo octopuses. The name "dumbo" originates from their resemblance to the title character of Disney's 1941 film ''Dumbo'', having a prominent ear-like fin which extends from ...
species

Sepioloida

There are 142 species in Sepioloida assessed as data deficient.

= Sepiids

= Sepiolids

= Sepiadariids

Oegopsina species

There are 104 Oegopsina species assessed as data deficient.

= Mastigoteuthidae

= Enoploteuthids

= Hooked squids

= Chiroteuthids

= Cranchiids

= Octopoteuthids

=Other Oegopsina species

Bathyteuthida

Cnidaria Cnidaria () is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter. Their distinguishing feature is cnidocytes, specialized cells that ...

There are 166 species in the phylum Cnidaria assessed as data deficient.

Hydrozoa Hydrozoa (hydrozoans; ) are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specialize ...

*'' Millepora braziliensis'' *'' Millepora nitida''

Anthozoa

There are 164 species in the class Anthozoa assessed as data deficient.

Tube-dwelling anemones

*'' Arachnanthus oligopodus''

Zoanthinaria

Actinaria Sea anemones are a group of predatory marine invertebrates of the order Actiniaria. Because of their colourful appearance, they are named after the ''Anemone'', a terrestrial flowering plant. Sea anemones are classified in the phylum Cnidaria, ...

Alcyonacea Alcyonacea, or soft corals, are an order of corals. In addition to the fleshy soft corals, the order Alcyonacea now contains all species previously known as "gorgonian corals", that produce a more or less hard skeleton, though quite different f ...

Scleractinia Scleractinia, also called stony corals or hard corals, are marine animals in the phylum Cnidaria that build themselves a hard skeleton. The individual animals are known as polyps and have a cylindrical body crowned by an oral disc in which a ...

There are 145 species in the order Scleractinia assessed as data deficient.

= Acroporids

= Oculinids

= Poritids

= Mussids

= Pectiniids

= Siderastreids

=Other Scleractinia species

Arthropods

There are 2875 arthropod species and 17 arthropod subspecies assessed as data deficient.

Arachnids

Branchiopoda Branchiopoda is a class of crustaceans. It comprises fairy shrimp, clam shrimp, Diplostraca (or Cladocera), Notostraca and the Devonian ''Lepidocaris''. They are mostly small, freshwater animals that feed on plankton and detritus. Description ...

*'' Streptocephalus kargesi''

Millipedes Millipedes are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name derived from this feature. Each double-legged segment is a resu ...

Maxillopoda Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can ...

Maxillopoda includes barnacles, copepods and a number of related animals. There are 22 species in the class Maxillopoda assessed as data deficient.

Sessilia

*'' Armatobalanus nefrens'' *''

Balanus aquila ''Menesiniella aquila'' is a species of acorn barnacle in the family Balanidae. It is found off the California coast from San Francisco to San Diego from the bottom of the intertidal zone down to depths of 18 m. It is preyed upon by fish, ...

Calanoida

There are 19 species in the order Calanoida assessed as data deficient.

= Diaptomids

= Temorids

= *'' Epischura massachusettsensis''

Harpacticoida Harpacticoida is an order of copepods, in the subphylum Crustacea. This order comprises 463 genera and about 3,000 species; its members are benthic copepods found throughout the world in the marine environment (most families) and in fresh water ( ...

*'' Thermomesochra reducta''

Xiphosura Xiphosura () is an order of arthropods related to arachnids. They are more commonly known as horseshoe crabs (a name applied more specifically to the only extant family, Limulidae). They first appeared in the Hirnantian ( Late Ordovician). Curr ...

Malacostracans

Malacostraca includes crabs, lobsters, crayfish, shrimp, krill, woodlice, and many others. There are 1130 malacostracan species and 17 malacostracan subspecies assessed as data deficient.

Isopods Isopoda is an order of crustaceans that includes woodlice and their relatives. Isopods live in the sea, in fresh water, or on land. All have rigid, segmented exoskeletons, two pairs of antennae, seven pairs of jointed limbs on the thorax, and ...

*'' Echinodillo cavaticus'' *'' Styloniscus sp. nov.''

Decapods The Decapoda or decapods (literally "ten-footed") are an order (biology), order of crustaceans within the class Malacostraca, including many familiar groups, such as crabs, lobsters, crayfish, Caridea, shrimp and Dendrobranchiata, prawns. Most ...

There are 1128 decapod species and 17 decapod subspecies assessed as data deficient.

= Parastacids

= Gecarcinucids

= Atyids

= Species Subspecies

= Cambarids

= Potamonautids

= Pseudothelphusids

= Potamids

= Palaemonids

= Species Subspecies

= Trichodactylids

= Spiny lobsters

=
Lobsters Lobsters are a family (Nephropidae, synonym Homaridae) of marine crustaceans. They have long bodies with muscular tails and live in crevices or burrows on the sea floor. Three of their five pairs of legs have claws, including the first pair, ...

= Slipper lobsters

= Reef lobsters

=Other decapod species

Insects Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of j ...

There are 1702 insect species assessed as data deficient.

Blattodea Blattodea is an order of insects that contains cockroaches and termites. Formerly, termites were considered a separate order, Isoptera, but genetic and molecular evidence suggests they evolved from within the cockroach lineage, cladistically ...

*'' Miriamrothschildia zonatus''

Orthoptera

There are 50 species in the order Orthoptera assessed as data deficient.

= Acridids

= Tettigoniids

= Phaneropterids

=Other Orthoptera species

Hymenoptera

There are 316 species in the order Hymenoptera assessed as data deficient.

= Colletids

= Melittids

= Apids

= Halictids

= Andrenids

= Megachilids

Mantises Mantises are an order (Mantodea) of insects that contains over 2,400 species in about 460 genera in 33 families. The largest family is the Mantidae ("mantids"). Mantises are distributed worldwide in temperate and tropical habitats. They hav ...

Lepidoptera

Lepidoptera comprises moths and butterflies. There are 87 species in the order Lepidoptera assessed as data deficient.

= Pyralids

= Swallowtail butterflies

= Lycaenids

= Nymphalids

= Skippers

=Other Lepidoptera species

Beetles

There are 377 beetle species assessed as data deficient.

= Geotrupids

=
Longhorn beetles The longhorn beetles (Cerambycidae), also known as long-horned or longicorns, are a large family of beetles, with over 35,000 species described. Most species are characterized by extremely long antennae, which are often as long as or longer than ...

= Click beetles

= Erotylids

= Scarabaeids

=Other beetle species

Odonata Odonata is an order of flying insects that includes the dragonflies and damselflies. Members of the group first appeared during the Triassic, though members of their total group, Odonatoptera, first appeared in Late Carboniferous. The two com ...

Odonata includes dragonflies and damselflies. There are 868 species in the order Odonata assessed as data deficient.

= Isostictids

= Platycnemidids

= Megapodagrionids

= Gomphids

= Cordulegastrids

= Corduliids

= Calopterygids

= Coenagrionids

= Euphaeids

= Macromiids

= Lestids

= Aeshnids

= Libellulids

= Polythorids

=Other Odonata species

Echinoderms

There are 244 echinoderm species assessed as data deficient.

Sea cucumbers Sea cucumbers are echinoderms from the class Holothuroidea (). They are marine animals with a leathery skin and an elongated body containing a single, branched gonad. Sea cucumbers are found on the sea floor worldwide. The number of holothurian ...

References

*Invertebrates Data deficient invertebrates {{bots, deny=BG19bot,Yobot

Nemertea Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of 1300 known species. Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many h ... species

Annelids The annelids (Annelida , from Latin ', "little ring"), also known as the segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecolog ...

Onychophora Onychophora (from grc, ονυχής, , "claws"; and , , "to carry"), commonly known as velvet worms (due to their velvety texture and somewhat wormlike appearance) or more ambiguously as peripatus (after the first described genus, '' Peripatus ...

Molluscs Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estim ...

Gastropods The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. The ...

Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouchet ...

= Partulids

= Subulinids

= Achatinellids

= Endodontids

= Charopids

= Helicarionids

= Orthalicids

= Euconulids

= Rhytidids

= Streptaxids

= Zonitids

= Pupillids

= Polygyrids

= Helminthoglyptids

= Camaenids

= Lauriids

= Vertiginids

= Bradybaenids

= Helicids

= Hygromiids

= Enids

=Other Stylommatophora

Littorinimorpha Littorinimorpha is a large order of snails, gastropods, consisting primarily of sea snails (marine species), but also including some freshwater snails ( aquatic species) and land snails ( terrestrial species).Bouchet P. & Rocroi J.-P. (Ed.); Frý ...

= Strombids

= Pomatiids

= Hydrobiids

= Cochliopids

= Bithyniids

= Moitessieriids

= Assimineids

= Pomatiopsids

= Lithoglyphids

= Amnicolids

= Stenothyrids

= Iravadiids

= Truncatellids

Sorbeoconcha Sorbeoconcha is a taxonomic clade of snails, i.e. gastropods, mainly marine species with gills and opercula, within the clade Caenogastropoda. The taxon Sorbeoconcha was named by Winston Ponder and David R. Lindberg in 1997. Taxonomy 1 ...

= Batillarids

= Pleurocerids

= Melanopsids

= Semisulcospirids

= Thiarids

= Pachychilids

= Paludomids

= Neocyclotids

= Cyclophorids

= Pupinids

= Diplommatinids

= Aciculids

= Viviparids

= Ampullariids

Lower Heterobranchia Lower Heterobranchia, also known as the Allogastropoda, is a group of rather specialized, highly evolved sea slugs and sea snails, ( marine gastropod mollusks) within the subclass Heterobranchia. WoRMS (2020). "Lower Heterobranchia". Accessed at ... species

= Helicinids

= Hydrocenids

= Neritids

Hygrophila species

= Physids

= Acroloxids

= Planorbids

= Lymnaeids

= Chilinids

= Latiids

= Turrids

= Marginellids

= Buccinids

= Muricids

= Conids

Eupulmonata Eupulmonata is a taxonomic clade of air-breathing snails. The great majority of this group are land snails and slugs, but some are marine and some are saltmarsh snails that can tolerate salty conditions. Linnean taxonomy *Suborder Eupulmonat ...

Bivalvia Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, biva ...

Pectinida Pectinida is a taxonomic order of large and medium-sized saltwater clams, marine bivalve molluscs, commonly known as scallops and their allies. It is believed that they began evolutionarily in the late Middle Ordovician epoch; many species, of ...

Unionida Unionida is a monophyletic order of freshwater mussels, aquatic bivalve molluscs.Bieler R., Carter J.G. & Coan E.V. (2010). ''Classification of Bivalve families''. pp. 113–133, in: Bouchet P. & Rocroi J.-P. (2010), ''Nomenclator of Bivalve Fa ...

= Margaritiferids

= Unionids

= Hyriids

Nemertea Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of 1300 known species. Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many h ...
species

Lower Heterobranchia Lower Heterobranchia, also known as the Allogastropoda, is a group of rather specialized, highly evolved sea slugs and sea snails, ( marine gastropod mollusks) within the subclass Heterobranchia. WoRMS (2020). "Lower Heterobranchia". Accessed at ...
species

=
Grimpoteuthis ''Grimpoteuthis'' is a genus of pelagic umbrella octopuses known as the dumbo octopuses. The name "dumbo" originates from their resemblance to the title character of Disney's 1941 film ''Dumbo'', having a prominent ear-like fin which extends from ...
species