Remains of the alimentary tract in the Late Ordovician trilobite Dalmanitina (Prague Basin, Barrandian area, Czech Republic)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F24%3A00583081" target="_blank" >RIV/67985831:_____/24:00583081 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/24:10492188

Výsledek na webu

<a href="https://riviste.unimi.it/index.php/RIPS/article/view/20845/20128" target="_blank" >https://riviste.unimi.it/index.php/RIPS/article/view/20845/20128</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.54103/2039-4942/20845" target="_blank" >10.54103/2039-4942/20845</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Remains of the alimentary tract in the Late Ordovician trilobite Dalmanitina (Prague Basin, Barrandian area, Czech Republic)

Popis výsledku v původním jazyce

Preservation of digestive structures in trilobites is generally rare, remains of the alimentary tract have been documented in about eighty of more than twenty thousand described species. Several tens of specimens belonging to five Cambrian and nine Ordovician species from the Barrandian area, Czech Republic, have markedly contributed to the knowledge of the trilobite digestive system. Here, we describe seven exceptionally preserved late holaspid trilobite specimens of species of the genus Dalmanitina collected from Upper Ordovician strata of the Barrandian area. All studied specimens are preserved as internal moulds and exhibit a narrow strip-like structure that runs sagitally or sub-sagitally under the axial lobe of the thoracopygon. These strip-like structures are markedly different from scavenger burrows and are interpreted as remains of the alimentary canal. A slightly expanded anterior-most part of the digestive system is preserved in the cephalic shield of six specimens and is interpreted as a remainder of the anterior midgut. A dark area is seen in the glabellar lobes of three specimens. These dark areas do not represent pyrite concentrations in the hypostome–glabellar cavity, because they contain only small amounts of Fe and S. These areas are interpreted as the remainder of cephalic digestive midgut diverticula, or the “perigastric organ”. Quantitative chemical analyses show that in species of Dalmanitina the digestive system is preserved as dark matter containing partly digested food particles and most probably also a higher amount of clay minerals. The described specimens constitute the first well-documented example of digestive structures in the subfamily Dalmanitininae.

Název v anglickém jazyce

Remains of the alimentary tract in the Late Ordovician trilobite Dalmanitina (Prague Basin, Barrandian area, Czech Republic)

Popis výsledku anglicky

Preservation of digestive structures in trilobites is generally rare, remains of the alimentary tract have been documented in about eighty of more than twenty thousand described species. Several tens of specimens belonging to five Cambrian and nine Ordovician species from the Barrandian area, Czech Republic, have markedly contributed to the knowledge of the trilobite digestive system. Here, we describe seven exceptionally preserved late holaspid trilobite specimens of species of the genus Dalmanitina collected from Upper Ordovician strata of the Barrandian area. All studied specimens are preserved as internal moulds and exhibit a narrow strip-like structure that runs sagitally or sub-sagitally under the axial lobe of the thoracopygon. These strip-like structures are markedly different from scavenger burrows and are interpreted as remains of the alimentary canal. A slightly expanded anterior-most part of the digestive system is preserved in the cephalic shield of six specimens and is interpreted as a remainder of the anterior midgut. A dark area is seen in the glabellar lobes of three specimens. These dark areas do not represent pyrite concentrations in the hypostome–glabellar cavity, because they contain only small amounts of Fe and S. These areas are interpreted as the remainder of cephalic digestive midgut diverticula, or the “perigastric organ”. Quantitative chemical analyses show that in species of Dalmanitina the digestive system is preserved as dark matter containing partly digested food particles and most probably also a higher amount of clay minerals. The described specimens constitute the first well-documented example of digestive structures in the subfamily Dalmanitininae.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10506 - Paleontology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Rivista Italiana di Paleontologia e Stratigrafia

ISSN

0035-6883

e-ISSN

2039-4942

Svazek periodika

130

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

20

Strana od-do

47-65

Kód UT WoS článku

001194970300008

EID výsledku v databázi Scopus

2-s2.0-85193210479