Deiphon forbesi, from here.

Belongs within: Cheirurinae.
Contains: Sphaerocoryphe.

The Deiphoninae are a group of trilobites known from the Upper Lower Ordovician to the Upper Silurian. They were commonly paedomorphic relative to related taxa, and may have been part of the vagrant benthos or nektobenthos (Přibyl et al. 1985).

Characters (from Přibyl et al. 1985): Glabella swollen; genae and thorax reduced; tenth thoracic segment often not separating from pygidium during ontogeny.

    |--Ovalocephalus Koroleva 1959PVP85
    |    |--*O. kelleri Koroleva 1959PVP85
    |    `--O. globosus Abdullaev 1972PVP85
       |--Onycopyge Woodward 1880PVP85
       |    |--*O. liversidgei Woodward 1880PVP85
       |    `--O. clarkei (Koninck 1877)PVP85
       `--Deiphon Barrande 1850PVP85
            |--*D. forbesi Barrande 1850PVP85
            |--D. americanum Weller 1907PVP85
            |--D. angelini Warburg 1925PVP85
            |--D. barrandei Whittard 1934PVP85
            |--D. braybrooki Perry & Chatterton 1979PVP85
            |    |--D. b. braybrookiPVP85
            |    `--D. b. bainsi Chatterton & Perry 1984PVP85
            |--D. brevispina Ramsköld 1983PVP85
            |--D. dikellum Whittard 1934PVP85
            |--D. ellipticum Ramsköld 1983PVP85
            |--D. fleur Šnajdr 1980PVP85
            |--D. globifrons Angelin 1854PVP85
            |--D. grovesi Chatterton & Perry 1984PVP85
            |--D. longifrons Whittard 1934PVP85
            |--D. pisum Foerste 1894PVP85
            |--D. pospisili Přibyl & Vaněk 1984PVP85
            |--D. salmoni Chatterton & Perry 1984PVP85
            |--D. snodensis Ramsköld 1983PVP85
            `--D. sphaericum Ramsköld 1983PVP85

*Type species of generic name indicated


[PVP85] Přibyl, A., J. Vaněk & I. Pek. 1985. Phylogeny and taxonomy of family Cheiruridae (Trilobita). Acta Universitatis Palackianae Olomucensis Facultas Rerum Naturalium Geographica-Geologica XXIV 83: 107–193.

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