Mustekalojen suuri sukukunta

Kuva I

Merillä on näkynyt omituisia merieläimiä aina, kun ihminen on siellä purjehtinut. Ja syvän meren tutkijat sitten ovat löytäneet erilaisia mustekaloj, joiden koko on ollut uskomaton. Kolossikalmari sekä humboldtin kalmari (Kuva I), jonka pyyntilonkerot ovat suhtettoman lyhyet, ovat todella suurikokoisia, ja todella oudon näköisiä eliöitä, joista jälkimnäinen voi kasvaa jopa 14 metrin mittaiseksi.

Kuva Ii

Kolossikalmarin (Kuva II) voi helposti sekoittaa humboldtin kalmariin, ja jälkimmäisellä niistä on kutenkin pidemmät lonkerot. Ja kolossikalmari kääntää nuo pitkät pyyntilonkeronsa yleensä taakse kun se alkaa uida suuremalla nopeudella. Noiden mustekalojen tunnistaminen on melko vaikeaa, ja kuvissa niitä on merkitty ristiin. Mutta nuo pidemmät lonkerot ovat kuitenkin hyvä tunniste, jolla nuo merieläimet voi erottaa toisistaan. Kuvassa kolme (Kuva III) on sen sijaan "Spagettimustekalana" tunnettu eläin, jonka lonkerot muistuttavat spagettia. Tuo mustekala ilmeisesti on sukua seepioille, koska sillä on niin paljon lonkeroita. Seepiat (Kuva IV)ovat kolmas pääryhmä noille nilviäisille , tai sitten kyseessä voi olla myös jonkinlainen eläinyhdyskunta. Toki nuo seepiat ovat erittäin alkukantaisia mustekaloja.

Kuva III

Joten kyseessä voi olla joku erittäin alkeellinen mustekala tai sitten jonkinlainen medusa.Eli olisiko kyseessä jokin puuttuva rengas mustekalojen ja medusoiden välistä. Mustekalojen esi-isien eli ammoniittien epäillään kehittyneen suoraan medusoista, jotka ovat taas kehittyneet suoraan noista yhdyskuntaeläimistä, joita ovat esimerkiksi portugalin sotalaivan kaltaiset maneettiryhmät. Seepiat ovat siis oikeastaan trias-kauden ammoniittien jälkeläisiä suoraan alenevassa polvessa.

Kuva IV

Comments

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