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| Keywords: Agnostus pisiformis fossil trilobites (Alum Shale Formation, upper Middle Cambrian; Hallevad, Billingen, Vastergotland, Sweden) (15077604408).jpg of the species Agnostus pisiformis see Bromell 1729 1740 Bromell described these fossils as minimorum vermiculorum vaginipennium small beetle-like worms Agnostoids differ from ordinary trilobites polymeroids by having the following characeristics two-segmented thorax; blind no eyes ; isopygous the heads tails are equal-sized Agnostoids are usually quite small Many modern arthropod phylogenetic studies conclude that agnostoids should be excluded from the trilobites Classification Animalia Arthropoda Trilobita Agnostida Agnostidae Stratigraphy Alum Shale Formation near-uppermost Middle Cambrian -------------- References cited Bromell M 1729 Lithographiæ Svecanæ specimen II sectio II De animalibus fossilibus illorumque variis partibus petrificatis caput primum de lapidibus insectiferis tubulis vermicularibus articulus primus de lapidibus insectifieris Scanicis Gothicis Acta Literaria Sveciæ 2 493-497 524-533 Bromell M 1740 Mineralogia et Lithographica Svecana Stockholm and Leipzig G Kiesewetter 148 pp https //www flickr com/photos/jsjgeology/15077604408/ Agnostus pisiformis fossil trilobites Alum Shale Formation upper Middle Cambrian; Hallevad Billingen Vastergotland Sweden 2014-09-16 23 28 https //www flickr com/people/47445767 N05 James St John cc-by-2 0 jsj1771 http //flickr com/photos/47445767 N05/15077604408 2015-05-06 20 12 52 cc-by-2 0 PD-old-70-1923 Files from James St John Flickr stream Agnostus pisiformis | ||||
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