Rodzaj Klapperilepis Dzik, 2002

Gatunek typowy
Palmatolepis triangularis Sannemann, 1955 from the early Famennian of Frankenwald.

Opis

Diagnosis. — P1 elements with raised tip of the dorsal process and underived appearance of the remaining elements of the apparatus.
Remarks. — Several new lineages emerged soon after the taxonomic diversity of the palmatolepidids was reduced to the single species, K. ultima.
This is proven by the occurrence of two distinct types of M elements in sample Pł-42: one of the primitive latest Frasnian morphology, the other of an appearance similar to that of K. quadrantinodosolobata. Other ramiform elements of the Klapperilepis apparatus do not form any discrete classes and are probably indistinguishable at the species level. It seems reasonable to assume that the P1 elements morphologically closest to K. ultima belong to the same apparatus as the associated primitive M elements. Platform elements of this kind show a relatively sinuous course of the blade. Juveniles may resemble Conditolepis tenuipunctata or Klapperilepis circularis. Somewhat arbitrarily this population is here considered to be the oldest K. triangularis.
Using the same line of reasoning one would expect that P1 elements resembling those of K. spathula in sample Pł-42 are conspecific with the advanced M elements. Although there is no apparent gap between the range of its morphologic variability and that of associated K. triangularis, such an interpretation is consistent with the apparatus reconstruction of K. schuelkei. The remaining morphotype of platform elements in sample Pł-42 is much more clearly delimited. In having a rhomboidal outline of the smooth platform with raised margins and a straight blade it closely resembles Tripodellus clarki and probably represents its early population. There is a gradual transition towards morphologies with a wide platform resembling K. delicatula.

Synonimy

Zasięg czasowy

Devonian: latest Frasnian-earliest Famennian

Literatura

Dzik, J. 2002. Emergence and collapse of the Frasnian conodont and ammonoid communities in the Holy Cross Mountains, Poland. Acta Palaeontologica Polonica 47, 565-650.

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
Palmatolepididae

Rodzaj
Klapperilepis


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Created by Jerzy Dzik on 2013/12/22 20:33

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