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Weeksina unispina (Walcott, 1916)
Characteristics of this trilobite are the backward directed spine on the 8th of 10 segment of the articulated middle part of the body (or thorax), and the second pair of furrows from the back on the raised central part of the headshield (or cephalon) called glabella, which curve from inward to fully backward, almost isolating a pair of lobes, just in front of the occipital ring, that is defined by a furrow that crosses the entire width of the glabella. Weeksina is known only from the Weeks Formation at North Canyon, House Range, Millard County, Utah.
Weeks Upper Middle Cambrian, Cenomanian Stage USAywang21
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Undescribed vachonisiids
An possible acercostracan marrellomorph from the Ordovician Beecher’s Trilobite. Similar features are also found in Xylokorys chledophilia from the Silurian of England, and Vachonisia rogeri from the Devonian of Germany, indicating acercostracan affinities for this new species. This taxon is characterised by the possession of a cordiform dorsal carapace with at least two pairs of marginal spines that covering the posterior body. The head comprises two stalked eyes. The trunk possesses more than 25 pairs of delicate, almost filamentous appendages.
Beecher's Trilobite Bed 2019 460 Mya oldywang21
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Undescribed polychaete
The creature has two antennaes with lots of setae. Family,Order,Genus remain unknown. The first picture is overlapped of positive and negative side.
Beecher's Trilobite Bed 2022 460 Mya oldywang21
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Undescribed Marrellid Marrellomorph
A very enigmatic marrellid arthropod that discovered from the BTB site. The overall exoskeleton shape looks quite similar to Furca bohemica from Letna Fm and Furca sp. from Fezouata Fm. Unfortunately there are no more soft-tissues preserved in this fossil.
Beecher's Trilobite Bed 2020 460 Mya oldywang21
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Undescribed frontal appendages of Caryosyntrips sp.
Caryosyntrips ("nutcracker") is an extinct genus of radiodont which existed in Canada and the United States during the middle Cambrian. Caryosyntrips is known only from a handful of 14-segmented frontal appendages, which resemble nutcrackers, recovered from the Burgess Shale Formation. It was first named by Allison C. Daley, Graham E. Budd in 2010 and the type species is Caryosyntrips serratus. The specimen showing here is probably the first Ordovician Caryosyntrips ever found globally.
Beecher's Trilobite Bed 2019 460 Mya oldywang21
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Undescribed frontal appendage
This is a very rare frontal appendage from an unknown arthropod. It might belongs to a great-appendage one or a radiodontant.
Beecher's Trilobite Bed 2019 460 Mya oldywang21
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Perspicaris dilatus (Robison & Richards, 1981)
Perspicaris is a fossil arthropod from the Cambrian period. It was 2–3 centimetres (0.8–1.2 in) long and bivalved. The valves, encasing the thorax, were joined together by a dorsal hinge. It is difficult to establish the lifestyle of Perspicaris. Its large eyes and other parts would suggest a swimming animal, yet it lacks claws, which seems to suggest a bottom feeder. Two species of Perspicaris are found in the famous Burgess Shale in British Columbia, Canada. 202 specimens of Perspicaris are known from the Greater Phyllopod bed, where they comprise 0.38% of the community. Perspicaris has been identified as an arthropod that is a member of a clade close to the crown-group of Euarthropoda, which includes myriapods, chelicerates, insects and crustaceans.
Wheeler Shale Miaolingian USAywang21
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Palaeothea devonica (Bergstrom, Sturmer & Winter, 1980)
Unique specimen of the pycnogonid Palaeothea devonica (the white section) in association with Botrvocrinus(Bathericrinus) hvstrix. Lower Devonian, Lower Emsian, Hunsrück Slate of Bundenbach, Rhein- Hunsrück district, Rhineland- Palatinate, Germany.
洪斯吕克板岩 下埃姆阶 德国ywang21
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Palaeoisopus problematicus (Broili, 1928)
Palaios = old. Isos = podus = with the same legs (isopod). Problema = problem. Palaeoisopus is the largest sea spider or the Hunsruck Slate. Body length is 40-142mm. The first limb span reaches up to 320mm
Hunsrück Slate 408–400 Mya old GERMANYywang21
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Olenoides vali (Robison & Babcock, 2011)
Diagnosis.—Olenoides with weak anterior expansion of glabella. Posterior cephalic border having tiny intergenal spines, with posterior cephalic margins between intergenal and genal spines deflected forward. Genal spines long, terminating approximately opposite front of pygidium. Occipital spine exceptionally long, arching strongly upward and rearward, terminating just in front of thoracic-pygidial boundary. Medial thoracic spines projecting upward with minor rear curvature and with length progressively increasing rearward from short to quite long beneath arching occipital spine; medial spine on eighth thoracic segment approximately same length as pygidial axis. Paired marginal spines on thorax and pygidium progressively increase in length rearward, with length of posterior pygidial pair similar to that of genal spines. Pygidium having three pairs of marginal spines and axis with four rings and terminal piece. Etymology.—After Val G. Gunther, for his many contributions to knowledge of Cambrian fossils (e.g., Gunther and Gunther, 1981). Holotype.—Exoskeleton, UU 10051.18 Discussion.—Olenoides vali n. sp. and O. trispinosus Rasetti (1946) are the only species of Olenoides known to have three pairs of marginal spines on the pygidium. However, the pygidial spines of O. vali markedly increase in length toward the rear, whereas those of O. trispinosus decrease in length toward the rear. Also, the pygidial axis of O. vali has four rings and a terminal piece, whereas O. trispinosus has five rings and a terminal piece. Olenoides vali further differs from all other species of Olenoides by exceptional elongation of the occipital spine and greater rearward elongation of medial spines on the thorax. White (1973), in an unpublished thesis, described a poorly preserved exoskeleton and a few small, disarticulated sclerites, here assigned to Olenoides trispinosus. Comparison of specimens known to the present authors shows a minor ontogenetic increase in lateral expansion of the anterior glabella. In some specimens, that expansion was further increased by taphonomic compression. Olenoides rooksi Bonino and Kier (2009) is an unavailable name because it fails to meet criteria of Article 13 of the International Code of Zoological Nomenclature. Occurrence.—Olenoides vali has an observed stratigraphic range through approximately the upper 110 m of the Wheeler Formation in the Drum Mountains, as defined herein. Some collectors have referred specimens from the upper part of this interval to either the Marjum or Pierson Cove formations.
Wheeler Shale Miaolingian USAywang21
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Olenoides pugio (Walcott, 1908)
Etymology-from Olenus, in Greek mythology a man who, along with his wife Lethaea, was turned to stone. Olenus was used for a trilobite genus name in 1827; the suffix -oides(“resembling”) was added later. Synonyms-Olenoides was formerly known as Neolenus. Species of Kootenia are no longer considered different enough from those in Olenoides to warrant placement in a separate genus. Olenoides is an average size trilobite (up to 9 cm long), broadly oval in outline. Its cephalon is semi-circular. The glabella is parallel-sided, rounded at its front and almost reaches the anterior border. Narrow occular ridges curve backwards from the front of the glabella to the small, outwardly-bowed eyes. The librigenae narrow backward into straight, slender genal spines that reach as far as the third thorax segment. Thorax consists of seven segments that end in needle-like spines. pygidium) has six axial rings that decrease in size backwards and four or five pairs of rearward pointing marginal spines. Cephalon, thorax and pygidium are of approximately equal length.
Marjum Formation Miaolingian USAywang21
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Olenoides nevadensis (Meek, 1870)
Olenoides is an average size trilobite (up to 9 cm long), broadly oval in outline. Its cephalon is semi-circular. The glabella is parallel-sided, rounded at its front and almost reaches the anterior border. Narrow occular ridges curve backwards from the front of the glabella to the small, outwardly-bowed eyes. The librigenae narrow backward into straight, slender genal spines that reach as far as the third thorax segment. Thorax consists of seven segments that end in needle-like spines. pygidium) has six axial rings that decrease in size backwards and four or five pairs of rearward pointing marginal spines. Cephalon, thorax and pygidium are of approximately equal length.
Wheeler Shale Miaolingian USAywang21
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Norwoodia boninoi (Robison & Babcock, 2011)
Diagnosis Norwoodia with wide anterior and lateral cephalic border furrow. Glabella short, slightly tapered, diminishing in relative length through ontogeny; lateral furrows weak to effaced. Occipital furrow weak to effaced. Occipital ring, with medial node, merging rearward into long, stout, variably flattened occipital spine. Palpebral lobes about half as long as glabella, opposite anterior glabella. Anterior sections of facial suture weakly divergent, posterior sections diverge laterally and slightly forward to border furrow and then gently curve rearward to lateral cephalic margin. Genal spines long and stout, similar in length to occipital spine, all three approximately reaching an imaginary transverse line near thoracic-pygidial boundary. Cephalic doublure with small anterior rostellum and posterior median suture. Thorax containing nine segments; unusually narrow and subcircular in outline, being slightly more than half as wide as maximum width of cephalon. Fourth thoracic segment having exceptionally long, slender, posteriorly directed, medial spine, its length greater than exoskeleton without spine. Pygidium tiny, short, and alate; width more than three times length; axis with two rings. Etymology After Enrico Bonino, for promoting knowledge of trilobites. Discussion Norwoodia boninoi is a macrocephalic trilobite that has a general morphology reminiscent of, and probably convergent with, some mid-Paleozoic bellinurid xiphosurans.
Weeks Upper Middle Cambrian, Cenomanian Stage USAywang21
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Naraoia cf. compacta
Naraoia is almost flat (dorso-ventrally). The upper (or dorsal) side of the body consists of a non-calcified transversely oval or semi-circular headshield (cephalon), and a tailshield (pygidium) longer than the cephalon, without any body segments in between. The body is narrowed at the articulation between cephalon and pygidium. The long many-segmented antennas are directed sideways. There are no eyes. The gut has a relatively large diameter (14-18% of the width of the body), and next to four pairs of large digestive sacs (or caeca). The cephalon has branched diverticula occupying most of the cephalon (unlike in Misszhouia). Naraoia had appendages with two branches on a common basis, like Misszhouia and trilobites. At least the anterior trunk limbs have exopods with large, paddle-shaped distal lobes and short flattened side branches (setae) on the shaft. The endopod (known only in N. compacta) is composed of six podomeres.
Wheeler Shale Miaolingian USAywang21
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Nahecaris stuertzi (Jaekel, 1921)
Nahe = tributary of the Rhine River. Caris = shrimp The most common non-trilobite arthropod. The large bivalved shield covers the head, thorax, and anterior segments of the abdomen. Body length is up to 150-200mm. Once again, this specimen is a true museum quality one, so I am gonna give it 5-star rarity.
Hunsrück Slate 2018 408–400 Mya oldywang21