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Order of molluscs
Pteropoda (common name pteropods, from Ancient Greek πτερόν (pterón), meaning "wing", and πούς (poús), meaning "foot") are specialized free-swimming pelagic
Pteropoda
Suborder of molluscs
known as holoplanktonic opisthobranch gastropod mollusks, in the order Pteropoda (also included within the informal group Opisthobranchia). Most pteropods
Sea_butterfly
Genus of flowering plants
plants belonging to the family Asteraceae. The only species is Ananthura pteropoda. Its native range is Kenya to Southern Tropical Africa. "Ananthura H.Rob
Ananthura_pteropoda
Species of flowering plant
Pitcairnia pteropoda is a plant species in the genus Pitcairnia. This species is endemic to Mexico. Espejo-Serna, Adolfo; López-Ferrari, Ana Rosa; Ramírez-morillo
Pitcairnia_pteropoda
Clade of gastropods
include both Thecosomata and Gymnosomata as separate branches of the order Pteropoda, whereas others list them as distinct orders within the subclass Heterobranchia
Sea_angel
Species of fly
Empis pteropoda is a species of fly in the family Empididae. It is included in the subgenus Leptempis. It is found in the Palearctic. Chandler, Peter
Empis_pteropoda
Taxon of gastropod molluscs
Euopisthobranchia consist of the following taxa: Umbraculoidea Anaspidea Runcinacea Pteropoda Cephalaspidea s.s. Previous studies discussed the gizzard (i.e. a muscular
Euopisthobranchia
Order Cephalaspidea Order Runcinida Order Aplysiida (Anaspidea) Order Pteropoda Suborder Euthecosomata Suborder Pseudothecosomata Suborder Gymnosomata
Gastropod_classification
Species of mollusc
Peracle reticulata is a species of Pteropoda, a form of sea snail. The species lives in deep waters, approximately 900 meters below sea level. It lives
Peracle_reticulata
Clade of gastropods
Pleurobranchomorpha Nudibranchia Euopisthobranchia Umbraculoidea Runcinacea Anaspidea Pteropoda Cephalaspidea s.s. Panpulmonata Siphonarioidea Sacoglossa Glacidorboidea
Heterobranchia
Clade of gastropods
Pleurobranchomorpha Nudibranchia Euopisthobranchia Umbraculoidea Runcinacea Anaspidea Pteropoda Cephalaspidea s.s. Panpulmonata Siphonarioidea Sacoglossa Glacidorboidea
Nudipleura
Suborder of molluscs
taxonomic unit used to classify sea snails. It is a suborder of the order Pteropoda. Cavolinioidea Gray, 1850 (1815) Limacinoidea Gray, 1840 MolluscaBase
Euthecosomata
Species of sea angel
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Clionidae Genus: Clione Species: C. okhotensis Binomial name Clione
Clione_okhotensis
Genus of gastropods
Development of Aberrant Stages in Clio Pyramidata Linnaeus, 1767 (Gastropoda, Pteropoda)". Bijdragen tot de Dierkunde. 43 (2): 202–216. doi:10.1163/26660644-04302004
Clio_(gastropod)
Family of gastropods
Notobranchaea bleekerae n. sp., a species new to science (Gastropoda, Pteropoda)". Basteria. 49: 29–36. Burridge, Alice; Hörnlein, Christine; Janssen
Notobranchaeidae
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Limacinidae Genus: Limacina Species: L. trochiformis Binomial
Limacina_trochiformis
Organisms living in water or air that drift in the current or wind
Tunicata); Cephalopoda; Amphipoda Macroplankton 2→20 cm metazoans; e.g. Pteropoda; Chaetognaths; Medusae; ctenophores; salps, doliolids and pyrosomes (pelagic
Plankton
Extinct species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Peraclidae Genus: Peracle Species: P. charlotteae Binomial name
Peracle_charlotteae
Genus of plants
Eupatorium L. 1753 not Bubani 1899 (Rosaceae) Synonyms Eupatorium sect. Pteropoda DC. Eupatorium sect. Subimbricata Hoffm. Viereckia R.M.King & H.Rob. Chrone
Eupatorium
Genus of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Clionidae Subfamily: Clioninae Genus: Fowlerina Pelseneer, 1906
Fowlerina
Family of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Superfamily: Limacinoidea Family: Limacinidae Gray, 1840 Genera See text
Limacinidae
Species of gastropod
"Euthecosomata, a group with remarkable developmental stages (Gastropoda, Pteropoda)". J. Noorduyn and Zn, Gorinchem, 375 pp. Bouchet, P.; Gofas, S. (2011)
Limacina_helicina
Only species in the gastropod family Hydromylidae
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Hydromylidae Genus: Hydromyles Gistel, 1848 Species: H. globulosus
Hydromyles_globulosus
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Clionidae Genus: Clione Species: C. antarctica Binomial name Clione
Clione_antarctica
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cliidae Genus: Clio Species: C. pyramidata Binomial name Clio
Clio_pyramidata
Family of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Superfamily: Hydromyloidea Family: Laginiopsidae (Pruvot-Fol, 1922) Genera
Laginiopsidae
Species of plant
Rhaphidophora montana Rhaphidophora nobile Rhaphidophora obliquata Rhaphidophora pteropoda Rhaphidophora sylvestris Rhaphidophora tetrasperma "Rhaphidophora hayi"
Rhaphidophora_hayi
Superfamily of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Suborder: Gymnosomata Superfamily: Clionoidea Families See text
Clionoidea
Italian malacologist and entomologist
basin. In 1888 he published the five parts dealing with Cephalopoda, Pteropoda and the first families of Gastropoda. In 1889 his student Prof. Federico
Luigi_Bellardi
Family of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Superfamily: Cavolinioidea Family: Cliidae Jeffreys, 1869 Synonyms Tripteridae
Cliidae
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cliidae Genus: Clio Species: C. cuspidata Binomial name Clio cuspidata
Clio_cuspidata
Genus of flowering plants
Colombia, Ecuador Montanoa pittieri Rob. & Greenm. - Costa Rica Montanoa pteropoda S.F.Blake - Guatemala Montanoa quadrangularis Sch.Bip. - Colombia, Venezuela
Montanoa
Species of Gastropoda
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cavoliniidae Genus: Cavolinia Species: C. pachysoma Binomial name
Cavolinia_pachysoma
Superfamily of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Suborder: Gymnosomata Superfamily: Hydromyloidea Species Hydromyles globulosus
Hydromyloidea
Species of gastropod
shelled pteropods of the northeast Pacific Ocean (Mollusca: Heterobranchia, Pteropoda)". Zoosymposia. 13 (1): 305–346. doi:10.11646/ZOOSYMPOSIA.13.1.22. Welch
Cavolinia_tridentata
Species of gastropod
zur kenntnis der Molluskenfauna des Beringsmeres. II. Gastropods und Pteropoda". Archiv für Naturgeschichte. 51 (1): 281. Retrieved 23 November 2025
Propebela_luetkeana
Genus of gastropods
terreni terziarii del Piemonte e della Liguria. Parte I. Cephalopoda, Pteropoda, Heteropoda. Gasteropoda (Muricidae et Tritonidae). Stamperia Reale, Torino
Pisanianura
Species of gastropod
biodiversitylibrary.org/page/14707119 page(s): 207, pl. 14, fig. 41 Report on the Pteropoda collected by H. M. S. Challenger during the years 1873-76. Part II. -
Limacina_antarctica
Species of mollusc
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Limacinidae Genus: Limacina Species: L. retroversa Binomial name
Limacina_retroversa
Family of gastropods
Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Superfamily: Clionoidea Family: Cliopsidae (Costa, 1873)
Cliopsidae
Species of flowering plant
schinifolium Siebold & Zucc. Synonyms Fagara mantchurica (Benn.) Honda Fagara pteropoda (Hayata) Y.C. Liu Fagara schinifolia (Siebold & Zucc.) Engl. nom. illeg
Zanthoxylum_schinifolium
Genus of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Clionidae Subfamily: Clioninae Genus: Clione Pallas, 1774 Synonyms
Clione
Genus of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cavoliniidae Subfamily: Cavoliniinae Genus: Cavolinia Abildgaard
Cavolinia_(gastropod)
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Clionidae Genus: Clione Species: C. limacina Binomial name Clione
Clione_limacina
Superfamily of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Suborder: Thecosomata Superfamily: Cymbulioidea Gray, 1840 Families See
Cymbulioidea
Genus of gastropods
classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Creseidae Genus: Styliola Gray, 1847
Styliola
Species of flowering plant
Australasian Virtual Herbarium Synonyms Boronia heterophylla F.Muell. var. heterophylla Boronia pteropoda Turcz. Boronia heterophylla var. brevipes Hook.f.
Boronia_heterophylla
Species of gastropod
Julia. The molluscan fauna of the Alum Bluff group of Florida, Part VI, Pteropoda, Opisthobranchia, and Ctenobranchia. No. 142-F. 1937. v t e v t e
Vexillum_ctenotum
Genus of gastropods
collection of the swedish state museum (riksmuseum). III. Opisthobranchia and pteropoda.. Kungliga Svenska Vetenskaps-Akademiens Handlingar 41: 1-118 MolluscaBase
Cumanotus
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Clionidae Genus: Clione Species: C. elegantissima Binomial name
Clione_elegantissima
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cymbuliidae Genus: Corolla Species: C. spectabilis Binomial name
Corolla_spectabilis
Species of gastropod
Opisthobranchiata. III. Gastropoda Polyplacophora. 2. Scaphopoda - 3. Pteropoda - 4. Cephalopoda. Abhandlungen zur geologischen Specialkarte von Preussen
Zebinella_cochlearina
Querétaro, Veracruz) D. parvibracteata Saar & Sørensen Mexico ( Jalisco) D. pteropoda Sherff 2n = 64 Mexico ( Puebla, Oaxaca) D. purpusii Brandg. Mexico (Chiapas)
List_of_Dahlia_species
Species of gastropod
collection of the Swedish state museum (riksmuseum). III. Opisthobranchia and pteropoda. Kungliga Svenska Vetenskaps-Akademiens Handlingar 41: 1-118 MolluscaBase
Doris_nobilis
Species of gastropod
French). 62 (6): 345-400 pl. 15-16. Massy, A.L. (1917). "The Gymnosomatous Pteropoda of the coast of Ireland". The Scientific Proceedings of the Royal Dublin
Pneumodermopsis_canephora
Species of mollusc
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Creseidae Genus: Creseis Species: C. acicula Binomial name Creseis
Creseis_acicula
Genus of molluscs
classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cavoliniidae Genus: Diacria Gray, 1840
Diacria_(gastropod)
Extinct family of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Superfamily: Cavolinioidea Family: †Sphaerocinidae A. Janssen & Maxwell
Sphaerocinidae
Species of Gastropoda
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cavoliniidae Genus: Cavolinia Species: C. uncinata Binomial name
Cavolinia_uncinata
Species of gastropod
zur kenntnis der Molluskenfauna des Beringsmeres. II. Gastropods und Pteropoda. Archiv für Naturgeschichte. 51(1): 256-302, pls 16-18, page 296, Tab
Onchidoris_tschuktschica
Species of Gastropoda
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cymbuliidae Genus: Corolla Species: C. ovata Binomial name Corolla
Corolla_ovata
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Clionidae Genus: Thalassopterus Kwietniewski, 1910 Species: T
Thalassopterus
Genus of molluscs
classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Hyalocylidae Genus: Hyalocylis Fol, 1875
Hyalocylis
Extinct species of gastropod
(1937). The molluscan fauna of the Alum Bluff Group of Florida. Part VI. Pteropoda, Opisthobranchia and Ctenobranchia (in part). United States Geological
Knefastia_waltonia
Extinct species of gastropod
(1937). The molluscan fauna of the Alum Bluff Group of Florida. Part VI. Pteropoda, Opisthobranchia and Ctenobranchia (in part). United States Geological
Carinodrillia_elocata
Genus of plants
California Pluchea polygonata (DC.) Gagnep. - India, Indochina Pluchea pteropoda Hemsl. ex Hemsl - China, Indochina Pluchea rosea R.K.Godfrey - Mexico
Pluchea
Species of gastropod
Opisthobranchiata. III. Gastropoda Polyplacophora. 2. Scaphopoda - 3. Pteropoda - 4. Cephalopoda. Abhandlungen zur geologischen Specialkarte von Preussen
Zebinella_geikiei
Superfamily of gastropods
collection of the Swedish State Museum (Riksmuseum). III. Opisthobranchia and Pteropoda". Kungliga Svenska Vetenskaps-Akademiens Handlingar. 41 (4): 1–118 – via
Cumanotoidea
Genus of yams
pseudorajanioides R.Knuth Dioscorea pseudotomentosa Prain & Burkill Dioscorea pteropoda Boivin ex H.Perrier Dioscorea pubera Blume Dioscorea pubescens Poir. Dioscorea
Dioscorea
Informal group of gastropods
Acteonimorpha, Ringipleura, Umbraculida, Cephalaspidea, Runcinida, Aplysiida, Pteropoda and Sacoglossa. Order Opisthobranchia Milne-Edwards, 1848 – sea slugs
Opisthobranchia
Pétersburg 7(2):97-214. Lindström G. 1884. On the Silurian Gastropoda and Pteropoda of Gotland. Stockholm, 250 pp. Page 59, plate 19, figure 3-4. (in Latin)
Pilina
Species of gastropod
(1937). The molluscan fauna of the Alum Bluff Group of Florida. Part VI. Pteropoda, Opisthobranchia and Ctenobranchia (in part). United States Geological
Compsodrillia_eucosmia
Superfamily of gastropods
Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Suborder: Thecosomata Superfamily: Limacinoidea Gray, 1840
Limacinoidea
Genus of flowering plants
Griff. Dillenia pentagyna Roxb. Dillenia philippinensis Rolfe Dillenia pteropoda (Miq.) Hoogland Dillenia pulchella (Jack) Gilg Dillenia quercifolia (C
Dillenia
Species of Gastropoda
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cavoliniidae Genus: Cavolinia Species: C. labiata Binomial name
Cavolinia_labiata
Family of gastropods
Creseidae is a family of gastropods belonging to the order Pteropoda. Genera: Boasia Dall, 1889 † Bovicornu Meyer, 1886 † Bowdenatheca R. L. Collins,
Creseidae
Extinct genus of molluscs
(1921). "The Cambrian Horizons of Comley (Shropshire) & their Brachiopoda, Pteropoda, Gasteropoda". The Quarterly Journal of the Geological Society of London
Latouchella
Species of gastropod
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cymbuliidae Genus: Cymbulia Species: C. peronii Binomial name
Cymbulia_peronii
Genus of gastropods
original on 2011-07-24. Retrieved 2010-08-20. Tesch J. J. (1908). "The Pteropoda of the Leyden museum". Notes from the Leyden Museum 29: 181-203. Stoch
Protatlanta
Swedish paleontologist (1829–1901)
Wallin (Holmiae), 60 pp. Lindström G. 1884. On the Silurian Gastropoda and Pteropoda of Gotland. Stockholm. Lindström G. 1899. Remarks on the Heliolitidae
Gustaf_Lindström
Species of gastropod
of the Eulimidae and other families of Gastropoda, as well as of the Pteropoda, procured in the Valorous expedition. Annals and Magazine of Natural History
Colus_jeffreysianus
Species of mollusc
waters between 55° N to 45° S. They are filter feeders as is typical among Pteropoda. Their diet consists of marine snow–organic matter that is suspended in
Cavolinia_inflexa
Species of mollusc
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Pneumodermatidae Genus: Pneumoderma Species: P. violaceum Binomial
Pneumoderma_violaceum
Family of gastropods
Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Superfamily: Clionoidea Family: Clionidae Rafinesque, 1815
Clionidae
Family of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Suborder: Euthecosomata Superfamily: Cavolinioidea Family: Cavoliniidae
Cavoliniidae
Species of flowering plant
environments. Montanoa atriplicifolia is most closely related to Montanoa pteropoda, of Mexico's southernmost state of Chiapas and southern Guatemala; also
Montanoa_atriplicifolia
Species of gastropod
Catalogue of the Mollusca in the collection of the British Museum, 2. Pteropoda. British Museum and E. Newman, London: iv + 45 pp. (in French) Souleyet
Atlanta_lesueurii
Extinct species of sea snail
(1937). The molluscan fauna of the Alum Bluff Group of Florida. Part VI. Pteropoda, Opisthobranchia and Ctenobranchia (in part). United States Geological
Lioglyphostoma_rusum
Species of gastropod
S. Challenger (1873-1876), Zoology, part LVIII (1887) : Report on the Pteropoda by Paul Pelseneer WoRMS : Cliopsis krohnii Gofas, S.; Le Renard, J.; Bouchet
Cliopsis
Family of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Superfamily: Clionoidea Family: Pneumodermatidae (Latreille, 1825) Genera
Pneumodermatidae
Species of mollusc
Retrieved 2023-11-17. Di Geronimo I. (1974). Hyalocylis obtusa n. sp. (Pteropoda, Thecosomata) in sedimenti abissali recenti dello Jonio. Conchiglie 10
Hyalocylis_striata
Species of pteropod
zoogeographic interpretation of the Diacria quadritentata group (Mollusca, Pteropoda). Bulletin, Zoologisch Museum, Universiteit van Amsterdam. 8(13): 101-119
Telodiacria_danae
Species of gastropod
of the Eulimidae and other families of Gastropoda, as well as of the Pteropoda, procured in the Valorous expedition. Annals and Magazine of Natural History
Troschelia_berniciensis
Species of gastropod
interpretation of colour patterns and description of D. rubecula n. sp.(Pteropoda)" (PDF). Bulletin Zoölogisch Museum. 16 (11): 1–3 – via Naturalis Institutional
Diacria_trispinosa
Species of Gastropoda
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Cavoliniidae Genus: Cavolinia Species: C. globulosa Binomial name
Cavolinia_globulosa
Extinct species of gastropod
(1937). The molluscan fauna of the Alum Bluff Group of Florida. Part VI. Pteropoda, Opisthobranchia and Ctenobranchia (in part). United States Geological
Lioglyphostoma_tyro
Pipoly Ardisia psychotriiphylla Pit. Ardisia pterocaulis Miq. Ardisia pteropoda Miq. Ardisia puberula H.R.Fletcher Ardisia pubicalyx Miq. Ardisia pubivenula
List_of_Ardisia_species
Species of mollusc
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Pneumodermatidae Genus: Pneumodermopsis Species: P. spoeli Binomial
Pneumodermopsis_spoeli
Belgian zoologist (1863-1945)
S. Challenger (1873-1876), Zoology, part LVIII (1887): Report on the Pteropoda by Paul Pelseneer another portrait of Paul Pelseneer portrait of Paul
Paul_Pelseneer
Genus of gastropods
Animalia Phylum: Mollusca Class: Gastropoda Clade: Euopisthobranchia Order: Pteropoda Family: Limacinidae Genus: Limacina Bosc, 1817 Type species Clio helicina
Limacina
PTEROPODA
PTEROPODA
PTEROPODA
PTEROPODA
PTEROPODA
PTEROPODA
PTEROPODA
PTEROPODA
PTEROPODA
n.
The middle portion of the foot in the Gastropoda and Pteropoda.
n. pl.
One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and Lamellibranchiata, or Conchifera. These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve.
n. pl.
A class of Mollusca in which the anterior lobes of the foot are developed in the form of broad, thin, winglike organs, with which they swim at near the surface of the sea.
n.
The posterior division of the foot in the Gastropoda and Pteropoda.
n.
One of the Pteropoda.
n.
A pteroid of the genus Cavolina. See Pteropoda, and Illustration in Appendix.
n. pl.
One of the orders of Pteropoda. They have no shell.
a.
Of or pertaining to the Pteropoda.
n. pl.
An order of Pteropoda comprising those species which have a shell. See Pteropoda.