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Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

The Journal of Latvian Academy of Sciences

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Volume 62, Issue 1-2 (Jan 2008)

Issues

A New Tristichopterid (Pisces, Sarcopterygii) from the Devonian of Latvia

Ivars Zupiņš
Published Online: 2008-08-14 | DOI: https://doi.org/10.2478/v10046-008-0007-0

A New Tristichopterid (Pisces, Sarcopterygii) from the Devonian of Latvia

A new species of tristichopterid sarcopterygians, Eusthenopteron kurshi, sp. nov., the earliest representative of the family reported to this date from the territory known as the Main Devonian Field, is described from the well-known fossil locality of Latvia, the Lode clay quarry (Upper Givetian/Lower Frasnian). One complete skeleton and several disarticulated bone elements of the head and shoulder girdle have been found. The material reveals some morphologic features like a relatively short parietal shield in the cranial roof and rather asymmetric caudal fin. Characteristic features for the species are a front end of the squamosal extending comparatively far anteriorly and opercular being twice as high as the subopercular.

Aprakstīta jauna tristihopterīdu suga Eusthenopteron kurshi sp. nov., kas ir senākais līdz šim konstatētais dzimtas pārstāvis Galvenā devona lauka teritorijā. Fosilijas atrastas Latvijā, Lodes mālu karjerā, vēlā Živetas/agrā Franas laikmeta nogulumos. Iegūts viens vesels skelets un vairāki atsevišķi galvas un plecu joslas skeleta kauli. Salīdzinoši nelielais parietālā vairoga garums smadzeņu kapsulas pārsegā un visai asimetriskā astes spura ir pazīmes, kuras tiek uzskatītas par tristihopterīdu primitīvāko pārstāvju raksturīgākajām iezīmēm. Zvīņas kaula (squamosum) visai tālu uz priekšu izvirzītais priekšējais stūris un vāka kauls (operculum), kas ir divreiz augstāks par zemvāka kaulu (suboperculum), ir dažas no aprakstītajai sugai tipiskajām pazīmēm.

Keywords: vertebrates; Givetian; Frasnian; morphology

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About the article


Published Online: 2008-08-14

Published in Print: 2008-01-01


Citation Information: Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences., ISSN (Print) 1407-009X, DOI: https://doi.org/10.2478/v10046-008-0007-0.

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