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By Shanchi Peng; Richard A Robison

Many trilobite species of the order Agnostida have brief stratigraphic levels and international distribution in open-marine deposits. they're such a lot plentiful and so much assorted from concerning the center center Cambrian to the center top Cambrian the place they're proving to be very good biostratigraphic indices. We describe strangely wealthy agnostoid faunas of that age from thick, well-exposed sections, one close to Paibi and one close to Wangcun, in northwestern Hunan Province, China. All collections are from the Huaqiao Formation, the definition of that's revised and its stratigraphic content material is increased. many of the fossils are good preserved in darkish, laminated, argillaceous carbonates that have been deposited in reduce slope environments. those are assigned to seventy six species and 33 genera. New species defined are Agnostus? babcocki, Ammagnostus? cryptus, Ammagnostus histus, Ammagnostus hunanensis, Ammagnostus wangcunensis, Baltagnostus? ambonus, Linguagnostus stenus, Lisogoragnostus hybus, Lisogoragnostus mictus, and Utagnostus songae. Species reassigned in a brand new conventional mix are Ammagnostus laiwuensis (Lorenz, 1906), Glaberagnostus? cicer (Tullberg, 1880), Kormagnostus minutus (Schrank, 1975), and Pseudophalacroma scanense (Westergård, 1946). The subfamily Ammagnostinae Öpik, 1967, is increased to relatives rank.  Read more...

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Extra resources for AGNOSTOID BIOSTRATIGRAPHY ACROSS THE MIDDLE-UPPER CAMBRIAN BOUNDARY IN HUNAN, CHINA

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Sect. ). SPRGL. (Cat. , II, 254). An lebenden Rinden von der tr. bis zur tp. , 800-3400 m. : Auf Vernonia volkameriaefolia bei Schuidien zwischen Möngdse und Manhao (6032). Auf Ternstroemia japonica auf dem Hsi-schan bei Yünnanfu (5724). Auf Rhododendron persicinum unter dem Passe Dsuningkou ober Dieuso zwischen Dali (Talifu) und Hodjing (6550). Im E auf Schoepfia jasminodora bei Djindjischan nächst Loping (10170). : Auf Rosa Roxburghii bei Hwangtsaoba (10248). Auf Crataegus cuneata zwischen Badschai und Maotsaoping (10771, fragliches Exemplar).

Medullathalli alba, KHO non reagens. a) Apothecia magna, usque 7 mm lata, crasse thallino-vestita 4. speciosum. b) Apothecia distincte minora. I. Apothecia crasse thallino-vestita, vertice excipuli punctiformi 2. fraternale. II. Apothecia nuda, excipulum semiglobosum, demum liberum 1. libricolum. 1. *A. EE) MüLL. Arg. (Cat. , I, 463). : Gu-schan bei Fudschou, an Baumrinden (CHUNG 596 a). 2. ** A. fraternale A. ZAHLBR. Thallus epiphloeodes, crustaceus, uniformis, expansus, substrato adhaerens, tenuis, 0,1--0,2 mm crassus, albido-glaucescens, subnitens, KHO flavidus, demum fulvescens, CaCl 2 0 2- , continuus, laevigatus, sorediis et isidiis non praeditus, in margine passim linea tenui nigricante circumdatus, strato corticali subchondroideo, decolore obductus; gonidia ad Trentepohliam pertinentia.

Thallus pro maxima parte endophloeodes, pars epiphloeodes macula suffusa indicata, argenteo-albida, nitidula, KHO-, CaCl 2 0 2- , continua, laevis, sorediis et isidiis destituta, in margine linea tenui, obscure cinerea cincta; gonidia incre bra, ad Trentepohliam pertinentia; hyphae thalli non amyloideae. Apothecia lirellina, sessilia, simplicia, recta, subrecta vel leviter flexuosa, usque 3 mm longa et ad 0,5 mm lata, lateraliter a thallo non obducta, ad apices acutata vel rotundata, nigra, fere opaca; discus rimiformis, niger, epruinosus; excipulum fuligineum, crassum, dimidiatum, labiis integris, arcuato-inflexis, ad basin subtriangularibus et inferne planatis; hymenium in sectione transversali rotundatum, superne anguste obscuratum, caeterum decolor et purum, usque 70 f1, altum, J lutescenti-cuprescens; paraphyses filiformes, strictae, simplices, eseptatae, ad apices non latiores, modice conglutinatae; hypothecium angustum, decolor; asci oblongo-clavati, superne rotundati et membrana incrassata cincti, bispori; sporae decolores, fusiformes, utrinque rotundatae, subrectae, 20 loculares, loculis lentiformibus, halone non cinctae, J violascentes, 82-90 f1, longae et 12-14 f1, latae.

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AGNOSTOID BIOSTRATIGRAPHY ACROSS THE MIDDLE-UPPER CAMBRIAN BOUNDARY IN HUNAN, CHINA by Shanchi Peng; Richard A Robison


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