Tetrastemma
Tetrastemma is a genus of nemerteans belonging to the family Tetrastemmatidae.
The genus has cosmopolitan distribution.
Species
Species:Tetrastemma aberrans Coe, 1901Tetrastemma aequicolor Chernyshev, 2024Tetrastemma albomaculatum Chernyshev, 2016Tetrastemma album Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023Tetrastemma ambiguum Riches, 1893Tetrastemma amphiporoides Bürger, 1893Tetrastemma angulatus Senz, 1993Tetrastemma antarcticum Bürger, 1893Tetrastemma appendiculatum Chernyshev, 1998Tetrastemma aseptata Tetrastemma assimile Örsted, 1844Tetrastemma bacescui Müller, 1962Tetrastemma baculus Tetrastemma basinum Corrêa, 1957Tetrastemma beaumonti Tetrastemma benedeni Czerniavsky, 1880Tetrastemma bicolor Coe, 1901Tetrastemma bilineatum Coe, 1904Tetrastemma bioculatum Örsted, 1843Tetrastemma bistriatum Tetrastemma brunneum Tetrastemma buxeum Bürger, 1895Tetrastemma candidum Tetrastemma carneum Hookabe, Oya, Tsuchida, Fujiwara & Ueshima, 2023Tetrastemma cerasinum Bürger, 1895Tetrastemma cincum Corrêa, 1957Tetrastemma coronatum Tetrastemma cruciatum Bürger, 1895Tetrastemma cupido Hookabe, Kohtsuka & Kajihara, 2021Tetrastemma diadema Hubrecht, 1879Tetrastemma dubium Örsted, 1845Tetrastemma duboisi Bürger, 1893Tetrastemma dutoiti Tetrastemma elegans Tetrastemma elongatum Tetrastemma enteroplecta Tetrastemma falsum Bürger, 1895Tetrastemma flavidum Ehrenberg, 1828Tetrastemma fozense Gibson & Junoy, 1991Tetrastemma freyae Chernyshev, Polyakova, Vignesh, Jain, Sanjeevi, Norenburg & Rajesh, 2020Tetrastemma fulvum Kirsteuer, 1963Tetrastemma georgianum Bürger, 1893Tetrastemma glanduliferum Bürger, 1895Tetrastemma hansi Bürger, 1893Tetrastemma hermaphroditicum Tetrastemma herouardi Tetrastemma herthae Corrêa, 1963Tetrastemma humile Tetrastemma incisum Stimpson, 1855Tetrastemma insolens Iwata, 1952Tetrastemma interruptumTetrastemma jeani McCaul, 1963Tetrastemma kangauzi Chernyshev, 2003Tetrastemma kefersteinii Tetrastemma kirsteueri Senz, 1995Tetrastemma knochii Tetrastemma laminariae Ushakov, 1928Tetrastemma leonillae Tetrastemma lilianae Corrêa, 1958Tetrastemma longissimum Bürger, 1895Tetrastemma longistriatum Wheeler, 1934Tetrastemma lophoheliae Bergendal, 1903Tetrastemma maculatum Tetrastemma maivikenensis Wheeler, 1934Tetrastemma marionis Joubin, 1890Tetrastemma melanocephalum Tetrastemma merula Tetrastemma microocelli Tetrastemma mixtum Tetrastemma montagui Senz, 2001Tetrastemma nanum Corrêa, 1957Tetrastemma nigrifrons Coe, 1904Tetrastemma nigrolineatum Wheeler, 1934Tetrastemma nimbatum Bürger, 1895Tetrastemma oerstedi Senz, 2001Tetrastemma olgarum Chernyshev, 1998Tetrastemma omicron Joubin, 1902Tetrastemma parallelos Abato, Yoshida & Kajihara, 2022Tetrastemma persona Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023Tetrastemma phaeobasisae Kulikova, 1987Tetrastemma pimaculatum Chernyshev, 1998Tetrastemma pinnatum Iwata, 1954Tetrastemma piolinum Corrêa, 1957Tetrastemma polyakovae Sagorny, von Döhren, Rouse & Tilic, 2022Tetrastemma portus Bürger, 1895Tetrastemma primum Corrêa, 1954Tetrastemma pseudocoronatum Chernyshev, 1998Tetrastemma quadrilineatum Coe, 1904Tetrastemma quadristriatum Langerhans, 1880Tetrastemma quadristriatum Grube, 1869Tetrastemma quatrefagesi Tetrastemma reticulatum Coe, 1904Tetrastemma robertianae McIntosh, 1874Tetrastemma rollandi Joubin, 1905Tetrastemma roseocephalum Tetrastemma roseum Verrill, 1892Tetrastemma schultzei Czerniavsky, 1880Tetrastemma scutelliferum Bürger, 1895Tetrastemma sexlineatum Coe, 1940Tetrastemma shohoense Hookabe, Kohtsuka, Fujiwara, Tsuchida & Ueshima, 2023Tetrastemma signifer Coe, 1904Tetrastemma simplex Tetrastemma stanleyi Wheeler, 1934Tetrastemma stimpsoni Chernyshev, 1992Tetrastemma strandae Sagorny, von Döhren, Rouse & Tilic, 2022Tetrastemma subpellucidum Örsted, 1843Tetrastemma suhmi Tetrastemma sundbergi Sagorny, von Döhren, Rouse & Tilic, 2022Tetrastemma tanikelyensis Kirsteuer, 1965Tetrastemma tristibruna Sundberg & Gibson, 1995Tetrastemma turdum Corrêa, 1957Tetrastemma tutus Tetrastemma unicolor Tetrastemma vastum Bürger, 1895Tetrastemma verinigrum Iwata, 1954Tetrastemma vermiculus Tetrastemma verrilli Tetrastemma viera Tetrastemma viperula Tetrastemma virgatum Kirsteuer, 1963Tetrastemma vittigerum Tetrastemma weddelli Wheeler, 1934Tetrastemma wilsoni Coe, 1943Tetrastemma worki Corrêa, 1961