Spatial organization of tubercles and terrace lines in Paradoxides forchhammeri - evidence of lateral inhibition

• Autorzy: Hammer O

Warianty tytułu

PL

Organizacja przestrzenna guzkow i linii pancerza trylobita Paradoxides forchhammeri swiadczy o inhibicji bocznej

• Języki publikacji: EN

Abstrakty

EN

Spatial statistics on the positions of trilobite tubercles indicate the existence of a developmental spacing mechanism. Similar spacing between sensory bristles, due to lateral inhibition, is well known in insects, and the genetic basis for these patterns has been thoroughly studied. Tubercles (granules) in the Middle Cambrian trilobite Paradoxides forchhammeri are spaced out, but otherwise randomly positioned. Assuming that similar genetic principles are in operation for the positioning of peripheral neuronal elements in all arthropods, it can even be speculated that genes with functions similar to Delta, Notch, achaete and scute were active in trilobite cuticular patterning. Also, in P. forchhammeri, terrace lines (ridges) seem to display transitions into granulation, indicating that these two types of structure share an underlying pattern formation mechanism.

PL

Analiza statystyczna rozmieszczenia guzków trylobita świadczy o istnieniu mechanizmu rozwojowego odpowiadającego za ich układ. Znany jest mechanizm inhibicji bocznej u owadów, odpowiedzialny za podobne odstępy szczecinek czuciowych, poznano takie jego podłoże genetyczne. Guzki (granule) środkowokambryjskiego trylobita Paradoxides forchhammeri są rozmieszczone losowo, ale z zachowaniem podobnych odstępów. Zakładając, że rozmieszczenie obwodowych elementów nerwowych u wszystkich stawonogów opierało się na podobnym podłożu genetycznym, można pokusić się o przypuszczenie, że w ornamentacji pancerza trylobitów uczestniczyły geny o funkcjach zbliżonych do owadzich genów Delta, Notch, achaete i scute. U P. forchhammeri można takie zaobserwować przejście między liniarni tarasowymi (grzebieniami) a granulacją, co wskazywałoby na wspólny mechanizm determinacji tych struktur.

Słowa kluczowe

PL

ewolucja; kambr; Paradoxides forchhammeri; pancerze; inhibicja boczna; szczecinki czuciowe; trylobity; paleontologia; stawonogi

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2000
• Tom: 45
• Numer: 3
• Opis fizyczny: s.251-270,rys.,fot.,bibliogr.

Twórcy

autor

Hammer O

• Paleontological Museum, University of Oslo, Sars gt.1, 0562 Oslo, Norway

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