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An unusual new lepidopleurid polyplacophoran (Mollusca) from the Germanic Muschelkalk (Triassic) (1990)

Geyer, Gerd ; Kukla, Peter A.

Paleontological Society

In: Journal of Paleontology. 1990; 64(2): 222-228. Published 1990 Mar 01. doi: 10.1017/s0022336000018382.

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Publication Date: 1990-03-01

Description: A fragmentary and probably immature polyplacophoran shell from the Middle Triassic Germanic Muschelkalk is presented. Morphological peculiarities of the specimen are a stiff connection of the head valve to the adjoining intermediate valve and the presence of a yet undescribed brim-like shell constituent, informally called border-plate herein. The unusually well-preserved shell structure is discussed in detail comprising tegmentum, crossed-lamellar p. hypostracum and the (articulamental?) border-plate. Characteristics indicate a systematic position within the order Lepidopleurina.

Print ISSN: 0022-3360

Electronic ISSN: 1937-2337

Topics: Geosciences

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Cambrian corynexochid trilobites from Morocco (1994)

Geyer, Gerd

Paleontological Society

In: Journal of Paleontology. 1994; 68(6): 1306-1320. Published 1994 Nov 01. doi: 10.1017/s0022336000034296.

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Publication Date: 1994-11-01

Description: Corynexochid trilobites of the Cambrian of Morocco are described and the subfamily Acontheinae is revised. With Kootenia beethoveni n. sp., Kootenia spp. indet., Strettonia sp. A, Clavigellus annulus n. gen. and sp., and gen. et sp. incert., the Moroccan Corynexochida comprise only a few forms that are almost exclusively restricted to the High Atlas Mountains. Biogeographical relationships are weak; strong relationships may exist with the faunas of the Shropshire area as already exemplified by some eodiscid and ellipsocephalid taxa.

Print ISSN: 0022-3360

Electronic ISSN: 1937-2337

Topics: Geosciences

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A new obolellid brachiopod from the Lower Cambrian of Morocco (1994)

Geyer, Gerd

Paleontological Society

In: Journal of Paleontology. 1994; 68(5): 995-1002. Published 1994 Sep 01. doi: 10.1017/s0022336000026603.

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Publication Date: 1994-09-01

Description: A new genus and species of obolellid brachiopod, Brevipelta chouberti, is described from the Early Cambrian of Morocco. It is a useful index fossil for the upper Choubertella Zone and the Daguinaspis Zone in Morocco. Additionally discussed are taphonomic aspects that lead to the question whether the shell may have been weakly calcified compared to other obolellid brachiopods and the calcareous part may have been composed of aragonite crystallites, or whether the preservation of Brevipelta is due to facile solubility of a calcitic shell substance. Brevipelta chouberti represents not only the oldest described Early Cambrian brachiopod from Africa, but one of the oldest obolellid brachiopods known worldwide.

Print ISSN: 0022-3360

Electronic ISSN: 1937-2337

Topics: Geosciences

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An enigmatic bilateral fossil from the Lower Cambrian of Morocco (1994)

Geyer, Gerd

Paleontological Society

In: Journal of Paleontology. 1994; 68(4): 710-716. Published 1994 Jul 01. doi: 10.1017/s0022336000026147.

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Publication Date: 1994-07-01

Description: Disklike, firm, bilaterally symmetrical fossils recovered from the middle Lower Cambrian Amouslek Formation of the Moroccan Anti-Atlas are described under the name Microschedia amphitrite n. gen. and sp. Their systematic affinity, particularly to brachiopods and cnidarians, and resemblance to existing taxa are discussed. Although interpretation as a brachiopod appears to be more convincing, their morphology does not permit a precise determination of systematic position.

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Electronic ISSN: 1937-2337

Topics: Geosciences

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