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Hystrichosphaeridium recurvatum ssp. recurvatum
Hystrichosphaeridium recurvatum subsp. recurvatum. Autonym. Holotype: White, 1842, pl.4, fig.12.
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Original description White, 1842:
The eleventh and last species of the genus Xanthidium, and the third of the Tubifera, I have named Tubiferum recurvatum or palmaforme, the curved or palm-formed Tubiferum ; it differs from the two preceding in having the tentacula decorated at their terminations with a cluster of smaller curved processes, diverging from the orifice of each tentaculum, and inclining back in the form of a cluster of palm-leaves, from four to six in number. Next to Tubiferwm simplex this is the most rare of all the species : the average of their diameter, measuring as before from the ends of the opposite tentacula, is from 1/330 to 1/280 of an inch.
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Original description White, 1842:
The eleventh and last species of the genus Xanthidium, and the third of the Tubifera, I have named Tubiferum recurvatum or palmaforme, the curved or palm-formed Tubiferum ; it differs from the two preceding in having the tentacula decorated at their terminations with a cluster of smaller curved processes, diverging from the orifice of each tentaculum, and inclining back in the form of a cluster of palm-leaves, from four to six in number. Next to Tubiferwm simplex this is the most rare of all the species : the average of their diameter, measuring as before from the ends of the opposite tentacula, is from 1/330 to 1/280 of an inch.