Pteruchus africanus
Pteruchus africanus is a pollen organ of a seed fern (Pteridospermatophyta). It was first described by Hamshaw Thomas [1] from the Umkomaas locality of South Africa.
Umkomasia macleani reconstruction of whole plant including leaves (Dicroidium odontopteroides, pollen organs (Pteruchus africanus based largely on material from the Umkomaas locality of South Africa[2]
| Pteruchus africanus | |
|---|---|
 | |
| Pteruchus africanus fossil pollen organ, Late Triassic, Molteno Formation, Umkomaas, South Africa. | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Division: | †Pteridospermatophyta |
| Order: | †Peltaspermales |
| Family: | †Corystospermaceae |
| Genus: | †Pteruchus |
| Species: | †P. africanus |
| Binomial name | |
| †Pteruchus africanus Thomas[1] | |
Description
The pollen organs Pteruchus africanus differ from other species of Pteruchus in small size, and equant blade supporting the pollen sacs.
Whole plant reconstructions
Pteruchus africanus may have been produced by the same plant as Umkomasia macleanii (ovulate organs) and Dicroidium odontopteroides (leaves), based on cuticular similarities between these leaves and reproductive structures at the Umkomaas locality of South Africa.[1]
gollark: +>addtag apioforms-class-υ.
gollark: ```sqliteWITH RECURSIVE xaxis(x) AS (VALUES(-2.0) UNION ALL SELECT x+0.05 FROM xaxis WHERE x<1.2), yaxis(y) AS (VALUES(-1.0) UNION ALL SELECT y+0.1 FROM yaxis WHERE y<1.0), m(iter, cx, cy, x, y) AS ( SELECT 0, x, y, 0.0, 0.0 FROM xaxis, yaxis UNION ALL SELECT iter+1, cx, cy, x*x-y*y + cx, 2.0*x*y + cy FROM m WHERE (x*x + y*y) < 4.0 AND iter<28 ), m2(iter, cx, cy) AS ( SELECT max(iter), cx, cy FROM m GROUP BY cx, cy ), a(t) AS ( SELECT group_concat( substr(' .+*#', 1+min(iter/7,4), 1), '') FROM m2 GROUP BY cy )SELECT '`' || '`' || '`' || group_concat(rtrim(t),x'0a') || '`' || '`' || '`' FROM a;```
gollark: ++supported_langs sql
gollark: Maybe make epicbot respond to virtual messages in virtual channels?
gollark: They do not in #apionet. However, they're considered to be from a bot.
References
- Thomas, .H. (1933). "On some pteridospermous plants from the Mesozoic rocks of South Africa". Philosophical Transactions of the Royal Society B. 222: 193–265. doi:10.1098/rstb.1932.0016.
- Retallack, G.J. & Dilcher, D.L (1988). "Reconstructions of selected seed ferns". Annals of the Missouri Botanical Garden. 75: 1010–1057. doi:10.2307/2399379.
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