Paropsonema
| Paropsonema Temporal range:
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|---|---|
Scientific classification 
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| Kingdom: | Animalia |
| Clade: | Ambulacraria |
| Clade: | †Cambroernida |
| Class: | †Eldonioidea |
| Clade: | †Paropsonemida |
| Genus: | †Paropsonema Clarke 1900 |
| Type species | |
| †P. cryptophya Clarke 1900
| |
| Species[1][2] | |
| |
Paropsonema is an eldonioid known from the Devonian of upstate New York and (if P. mirabile is a species of Paropsonema rather than Discophyllum) the Silurian of southern Australia. It is the latest-surviving known member of the Eldonioidea and Cambroernida.[1]
A specimen described in 2018 may represent an additional species, but has been tentatively assigned to P. cryptohya;[3] it represents the youngest described paropsonemid.[4]
The species Discophyllum mirabile has been thought to be closer to Paropsonema than to the sole previously-described species of Discophyllum, D. peltata.[5] As a result, sources treat it as Paropsonema mirabile.[1] Conversely, at least one worker has treated P. cryptophya as a member of Discophyllum, D. cryptophya, although this has not been followed by later authors.[6] Regardless, Paropsonema and Discophyllum are grouped together informally as "paropsonemids."[6][1]
References
[edit | edit source]- ^ a b c d Schroeder, Paterson & Brock 2018, pp. 80–81
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Hagadorn & Allmon 2018, p. 213
- ^ Hagadorn & Allmon 2018, p. 208
- ^ Zhu, Zhao & Chen 2002, p. 180
- ^ a b Hagadorn & Allmon 2018, p. 212
Works cited
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