Grantia és un gènere d'esponja calcària de la familia Grantiidae. Aquest gènere va ser descrit per primera vegada per Fleming el 1828.Fleming, J. (1828). A history of British animals, exhibiting the descriptive characters and systematical arrangement of the genera and species of quadrupeds, birds, reptiles, fishes, Mollusca, and Radiata of the United Kingdom; including the indigenous, extirpated, and extinct kinds, together with periodical and occasional visitants. Edinburgh, Bell & Bradfute / London, James Duncan. Pp. i-xxii, 1-565. corrigenda., available online at http://www.biodiversitylibrary.org/item/18569Van Soest, R.W.M.; Boury-Esnault, N.; Hooper, J.N.A.; Rützler, K.; de Voogd, N.J.; Alvarez, B.; Hajdu, E.; Pisera, A.B.; Manconi, R.; Schönberg, C.; Klautau, M.; Kelly, M.; Vacelet, J.; Dohrmann, M.; Díaz, M.-C.; Cárdenas, P.; Carballo, J.L.; Ríos, P.; Downey, R.; Morrow, C.C. (2021). World Porifera Database. Grantia Fleming, 1828. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=131703 on 2021-04-21
Taxonomia El gènere inclou diverses espècies,
Grantia aculeata (Urban, 1908) Grantia arctica (Haeckel, 1872) Grantia atlantica (Ridley, 1881) Grantia beringiana (Hôzawa, 1918) Grantia canadensis (Lambe, 1896) Grantia capillosa (Schmidt, 1862) Grantia comoxensis (Lambe, 1893) Grantia compressa (Fabricius, 1780) Grantia cupula (Haeckel, 1872) Grantia extusarticulata (Carter, 1886) Grantia fistulata (Carter, 1886) Grantia foliacea (Breitfuss, 1898) Grantia genuina (Row & Hôzawa, 1931) Grantia glabra (Hôzawa, 1933) Grantia harai (Hôzawa, 1929) Grantia hirsuta (Topsent, 1907) Grantia indica (Dendy, 1913) Grantia infrequens (Carter, 1886) Grantia intermedia (Thacker, 1908) Grantia invenusta (Lambe, 1900) Grantia kempfi (Borojevic & Peixinho, 1976) Grantia kujiensis (Hôzawa, 1933) Grantia laevigata ((Haeckel, 1872) Grantia mexico (Hôzawa, 1940) Grantia mirabilis ((Fristedt, 1887) Grantia monstruosa (Breitfuss, 1898) Grantia nipponica (Hôzawa, 1918) Grantia phillipsi (Lambe, 1900) Grantia primitiva (Brøndsted, 1927) Grantia ramulosa (Dendy, 1924) Grantia singularis ((Breitfuss, 1898) Grantia socialis (Borojevic, 1967) Grantia strobilus (Haeckel, 1872) Grantia stylata (Hôzawa, 1929) Grantia tenuis (Urban, 1908) Grantia transgrediens (Brøndsted, 1931) Grantia tuberosa (Poléjaeff, 1883) Grantia uchidai (Hôzawa & Tanita, 1941) Grantia vosmaeri (Dendy, 1893)
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