Adaptive radiation of monograptids after the Late Wenlock crisis

• Autorzy: Koren T N , Urbanek A
• Języki publikacji: EN

Abstrakty

EN

Succession of late Wenlock graptolites in the Kursala Formation, Tien Shan (Kirghizia), documents of the early recovery phase after the global C. lundgreni Event. Pristiograptus dubius was the only survivor among monograptids. After displaying a mass occurrence and an increased variation, the P. dubius stem lineage splits into two main trends: line A, represented by Pristiograptus idoneus and line B, represented by Colonograptus? praedeubeli. The former leads to Lobograptus? sherrardae, a generalized forerunner of such diverse trends as linograptids, cucullograptids and possibly also neocucullograptids (via Bohemograptus). The latter initiates the Colonograptus-Saetograptus line. The P. idoneus - L.? sherrardae lineage shows distinct gracilization, an apomorphic feature, while the other one preserves ancestral robustness, a plesiomorphic character. Hence, the bulk of the later monograptids of Gorstian and Ludfordian age may be derived from the P. dubius stem lineage. In respect of this conservative lineage a non-cladistic approach is prefered, because its morphological spectrum and evolutionary potential, and as we believe its specific identity, were preserved, in spite of numerous speciation events, until the early Pridoli.

PL

Współczesne badania nad kryzysem biotycznym jaki dotknął monograptidy w późnym wenloku (tzw. zdarzenie C. lundgreni), pozwalają ocenić zarówno skalę masowego wymierania (przeżywa tylko jeden gatunek, Pristiograptus dubius), jak i przebieg procesów składających się na wczesny etap odradzania fauny graptoloidowej. Duże znaczenie dla poznania tych ostatnich miało zbadanie obfitej fauny z formacji Kursala, w górach Tien Szań (Kyrgystan). Różnicowanie się szczepu Pristiograptus dubius było poprzedzone jego masowym występowaniem i zwiększoną zmiennoscią. Następnie doszło do oddzielenia się dwu głównych linii ewolucyjnych: linii A, reprezentowanej przez P. idoneus oraz linii B, którą wyznacza pojawienie się Colonograptus? praedeubeli. Pierwszy gatunek dał początek Lobograptus? sherrardae, stanowiącemu wspólnego przodka tak rozbieżnych trendów ewolucyjnych jak linograptidy (Neodiversograptus nilssoni), kukullograptidy (Lobograptus progenitor), a prawdopodobnie także neokukullograptidy (za pośrednictwem Bohemograptus). Natomiast C.? praedeubeli, przedstawiciel lini B, zapoczątkowuje rozwój charakterystycznych dla wczesnego ludlowu monograptidów "kolczastych" (Colonograptus, Saetograptus). Rozejście się wspomnianych linii ewolucyjnych określone jak "wczesna schizma", wyznacza zarazem główne kierunki ewolucji monograptidów ludlowu.

Słowa kluczowe

PL

sylur; fauna graptoloidowa; Pristiograptus dubius; ewolucja; wymieranie gatunkow; skamienialosci; monograptidy; ludlow; paleontologia; wenlok

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1994
• Tom: 39
• Numer: 2
• Opis fizyczny: s.137-167,fot.,rys.,bibliogr.

Twórcy

autor

Koren T N

autor

Urbanek A

• Instytut Paleobiologii PAN, Aleja Żwirki i Wigury 93, 02-089 Warszawa, Poland.

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