Hemilistrona homoirregularis Ziegler, 1971


Sugerowana cytacja: Dzik 2015. Hemilistrona homoirregularis Ziegler 1971. Ikonoteka (http://ikonoteka.paleo.pan.pl/xwiki/bin/view/Species/Hemilistrona+homoirregularis+)

Diagnoza

Mature Pand Pelement with posterior platform tongue bent downward and ornamented with tubercles.

Porównanie

Except for the mature Pelements, there is a puzzling variability in virtually all aspects of the platform shape and ornamentation. This is probably the most variable population of polygnathids in the Famennian of the Holy Cross Mts. There is a transition to morphologies classified here as Hemilistrona margaritata, Polygnathus? experplexus and even Neopolygnathus communis. Until population and apparatus studies on much larger and taxonomically less diverse material are performed, this classification can be treated only as provisional. 

Autekologia

Występowanie geograficzne

Ostrówka, Miedzianka, Kowala and Jabłonna.

Zasięg czasowy

P. trachytera to L. jugosus Zones. 

Materiały muzealne

ZPAL: 810 specimens.

Literatura

Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359.

Specyfikacja

Królestwo
ANIMALIA 

Typ
CHORDATA 

Podtyp
CONODONTA

Gromada
CONODONTOPHORIDA

Podgromada
EUCONODONTA

Rząd
Ozarkodinida

Podrząd
Ozarkodinina

Rodzina
Polygnathidae

Rodzaj
Hemilistrona

Gatunek
Hemilistrona homoirregularis

Synonimy

Populacja typowa gatunku

Holotyp

Thomas 1949, p. 417, pl. 2:27 (Palmatolepis? irregularis) C. 830-5

Locus typicus

High Bridge locality, road cut southeast of Kolona in Iowa.

Stratum typicum

Maple Mill Shale.


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Created by Administrator on 2015/05/18 14:41

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