Kana isu tichitaura nezvekwakabva zvirimwa, zita rinogara richiuya: Cooksonia. Icho chirimwa chakaonekwa pakati penguva yeSilurian, ndiko kuti, pakati pemakore mazana mana nemakumi mana nemakumi mana nematatu emakore apfuura.
Kubva mairi zvizhinji zvezvirimwa zvatinoziva nhasi zvinogona kugadzirwa, kubva pamiti mikuru kusvika kumaruva. Asi, Zvanga zviri sei?
Hunhu hweCooksonia
Yedu protagonist yaive chirimwa chaigara kumatunhu ese epasi: Ireland, Wales, England, Bolivia, United States, Great Britain, Australia. Aive asingasvike masendimita gumi pakureba, asi zvinonakidza kwazvo kuiziva sezvo yaive imwe yemiti yekutanga yepasi inogara Pasi.
Yakanga isina mashizha, asi madzinde ayo, aive akafanana neY, aigona kugadzira chlorophyll uye, nekudaro, photosynthesis uye kukura. Yakanga isinawo midzi sekuziva kwedu nhasi, asi yakanga yakasungirirwa pasi kuburikidza neiyo yakatenderera rhizome. Maitiro ayo ekuwedzeredza aive kuburikidza nema spores akaumbwa kumagumo kwega rega, sporangia, kunyangwe zvisati zvajeka.
Mhando
Parizvino, marudzi manomwe akasiyana akawanikwa:
- C.pertoni, muna 1937
- C. hemisphaerica, muna 1937
- C. cambrensis, muna 1979
- C.paranensis, muna 2001
- bohemian c., muna 1980
- C. banksii, muna 2002
Kunyangwe iyo isingatariswe sedare fosi, iri yaive yekushanduka degree reiyo yekutanga genus. Muchokwadi, mhando ina dzakasiyana dzezvipuka zvemarudzi akasiyana siyana dzakawanikwa mu sporangia yeimwe yemhando yeCooksonia.
Miti iyi yakatsanangurwa neBritish William Henry Lang muna 1937, akaitumidza mazita mukukudza Isabel Cookson, mukadzi akaunganidza zviumbwa zveimwe yemhando makore matatu apfuura paPerton Quarry.
Wakafungei nezveichi chirimwa chakatsakatika?