The holothurian paraspecies Achistrum brevisMostler, 1971 from the Norian of Hernstein (Lower Austria), is a junior homonym of Achistrum brevisGutschick, 1959. A. brevisGutschick, 1959 is a significant element in the Lower Mississippian of northern Indiana, USA (Gutschick, 1959, 132). In consideration of this homonymy, it is proposed that Achistrum brevisMostler, 1971, is changed and designated as Achistrum hagdorni Mostler & Reich nom. nov.
Class HolothuroideaBlainville, 1834
Order ApodidaBrandt, 1835
Parafamily AchistridaeFrizzell & Exline, 1956
Paragenus AchistrumEtheridge, 1881 emend. Frizzell & Exline, 1956
Achistrum hagdorni nom. nov. (Fig....
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