# Sycon

Sycon is a genus of calcareous sponges belonging to the family Sycettidae. These sponges are small, growing up to 7.5 cm with a length from 2.5 to 7.5 cm, and are tube-shaped and often white to cream in colour. They are known to aquarium hobbyists as "Pineapple" or "Q-Tip" sponges, and are frequent "hitchhikers" accidentally brought in.

## Species

The following species are recognised in the genus Sycon:
* Sycon abyssale Borojevic & raat-Kleeton, 1965
* Sycon acanthoxea (Little, 1963)
* Sycon album Tanita, 1942
* Sycon ampulla (Haeckel, 1870)
* Sycon antarcticum (Jenkin, 1908)
* Sycon arcticum (Haeckel, 1870)
* Sycon australe (Jenkin, 1908)
* Sycon avus Chagas & Cavalcanti, 2017
* Sycon barbadense (Schuffner, 1877)
* Sycon bellum Chagas & Cavalcanti, 2017
* Sycon boreale (Schuffner, 1877)
* Sycon brasiliense Borojevic, 1971
* Sycon calcaravis Hozawa, 1929
* Sycon caminatum Thacker, 1908
* Sycon capricorn Wörheide & Hooper, 2003
* Sycon carteri Dendy, 1893
* Sycon ciliatum (Fabricius, 1780)
* Sycon coactum (Urban, 1906)
* Sycon compactum Lambe, 1893
* Sycon conulosum Cóndor-Luján, Louzada, Hajdu & Klautau, 2018
* Sycon cylindricum Tanita, 1942
* Sycon defendens Borojevic, 1967
* Sycon digitiforme Hozawa, 1929
* Sycon dunstervillia (Haeckel, 1872)
* Sycon eglintonense Lambe, 1900
* Sycon elegans (Bowerbank, 1845)
* Sycon ensiferum Dendy, 1893
* Sycon escanabense Duplessis & Reiswig, 2000
* Sycon faulkneri Ilan, Gugel, Galil & Janussen, 2003
* Sycon formosum (Haeckel, 1870)
* Sycon frustulosum Borojevic & Peixinho, 1976
* Sycon gelatinosum (Blainville, 1834)
* Sycon giganteum Dendy, 1893
* Sycon globulatum Hozawa, 1929
* Sycon grantioides Dendy, 1916
* Sycon helleri (Lendenfeld, 1891)
* Sycon hozawai Breitfuss, 1932
* Sycon huinayense Azevedo, Hajdu, Willenz & Klautau, 2009
* Sycon humboldti Risso, 1826 type species
* Sycon inconspicuum (Lendenfeld, 1885)
* Sycon incrustans Breitfuss, 1898
* Sycon karajakense Breitfuss, 1897
* Sycon kerguelense Urban, 1908
* Sycon lambei Dendy & Row, 1913
* Sycon lendenfeldi Row & Hozawa, 1932
* Sycon lingua (Haeckel, 1870)
* Sycon lunulatum (Haeckel, 1872)
* Sycon luteolum Tanita, 1942
* Sycon magnapicale Cóndor-Luján, Louzada, Hajdu & Klautau, 2018
* Sycon matsushimense Tanita, 1940
* Sycon mexico Hozawa, 1940
* Sycon minutum Dendy, 1893
* Sycon misakiense Hozawa, 1929
* Sycon mundulum Lambe, 1900
* Sycon munitum Jenkin, 1908
* Sycon natalense Borojevic, 1967
* Sycon okadai Hozawa, 1929
* Sycon ornatum Kirk, 1898
* Sycon oscari Van Soest & De Voogd, 2018
* Sycon parvulum (Preiwisch, 1904)
* Sycon pedicellatum Kirk, 1911
* Sycon pentactinalis Rossi, Farina, Borojevic & Klautau, 2006
* Sycon plumosum Tanita, 1943
* Sycon proboscideum Breitfuss, 1898
* Sycon proboscideum (Haeckel, 1870)
* Sycon protectum Lambe, 1896
* Sycon pulchrum Tanita, 1943
* Sycon quadrangulatum (Schmidt, 1868)
* Sycon ramsayi (Lendenfeld, 1885)
* Sycon raphanus Schmidt, 1862
* Sycon rotundum Tanita, 1941
* Sycon satsumense Hozawa, 1929
* Sycon scaldiense (Van Koolwijk, 1982)
* Sycon schmidti (Haeckel, 1872)
* Sycon schuffneri Dendy & Row, 1913
* Sycon setosum Schmidt, 1862
* Sycon simushirense Hozawa, 1918
* Sycon stauriferum (Preiwisch, 1904)
* Sycon subhispidum (Carter, 1886)
* Sycon sycandra (Lendenfeld, 1895)
* Sycon tuba Lendenfeld, 1891
* Sycon urugamii Tanita, 1940
* Sycon verum Row & Hozawa, 1931
* Sycon vigilans Sarà & Gaino, 1971
* Sycon villosum (Haeckel, 1870)
* Sycon yatsui Hozawa, 1929