Semiacontiodus cornuformis (Sergeeva, 1963)


Sugerowana cytacja: Moczyński 2017. Semiacontiodus cornuformis (Sergeeva, 1963) Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/view/Species/Semiacontiodus+cornuformis)

Diagnoza

The symmetrical element tr bears lateral furrows, which separate wide lateral ribs continuously connecting the base with the tip of the cusp. The medial inner rib with a deep medial furrow at its base.

Porównanie

The main element types of the apparatus were identified by DZIK ( 1976); The most characteristic feature of the species is the robustly alate appearance of the tr element, which has a regularly triangular contour in medial view. Identifications of other element types are highly tentative because of their morphologic simplicity and the great population variability.

Autekologia

Występowanie geograficzne

Mójcza

Zasięg czasowy

Occurs only below the discontinuity surface in M6jcza (the oldest undoubted
specimens found 0.8 m below of it) while in the Baltic region it is a long ranging species . Its upper range is difficult to determine in the Baltic sections because it is very rare above the Llanvirn and the
diagnostic symmetrical elements are rarely reported .

Materiały muzealne

Literatura

Dzik, J. 1994a Conodonts of the Mójcza Limestone. In: J. Dzik, E. Olempska, & A. Pisera. Ordovician carbonate platform of the Holy Cross Mountains. Palaeontologia Polonica 53, 43-128. 

Specyfikacja

Królestwo
ANIMALIA 

Typ
CHORDATA 

Podtyp
CONODONTA

Gromada
CONODONTOPHORIDA

Podgromada
EUCONODONTA

Rząd
Protopanderodontida

Rodzina
Protopanderodontidae

Rodzaj
Semiacontiodus

Gatunek
Semiacontiodus cornuformis

Synonimy
Scolopodus cornuformis sp. n.; SERGEEVA, 1963; cf. Scandodus polonicus sp. nov.; SPASSOV and TELLER, 1963; Scolopodus cordis n. sp. HAMAR, 1966; Semiacontiodus cornuformis (SERGEEVA); DZIK, 1976

Populacja typowa gatunku

Holotyp

Locus typicus

Simonkovo, right bank of th e Volchov River, Ingria (St. Petersburg district ), northern Russia.

Stratum typicum

Kundan (Arenig/Llanvirn boundary)


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Utworzone 2017/09/27 12:47 przez Administrator

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