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Taxonomy according to fossilworks.org. Diagnosis for the genus according to Bartram, 1977 (p. 140, excerpts): "Large, elongate macrosemiid fishes; skull roof free from ganoine; supratemporals greatly reduced; cephalic division of main lateral line and supratemporal commisure exposed by fenestrae; vomers bearing a transverse row of stout pointed teeth and a pair of large blunt teeth; ventral parts of anterior three infraorbitals expanded and overlapping the maxilla; gape very small, the quadrate articulation lying in front of the orbit ... dorsal fin single, extending from the occiput to the base of caudal fin, with between 32 and 39 rays each bearing denticles, leading ray proceeded by two basal fulcra, fringing fulcra absent; region immediately on either side of dorsal fin devoid of scales; scales rhomboid, secondary transverse rows intervening between primary rows above the lateral line, scales below lateral line forming a pattern of rectangles." Line drawing from Bartram, 1977, p. 141. Identified by oilshale using Bartram, 1977. Macrosemius is easily recognized among the fishes of Solnhofen by the continuous dorsal fin. References: Agassiz, L. (1843): Recherches Sur Les Poissons Fossiles. Tome I (livr. 18). Imprimerie de Petitpierre, Neuchatel xxxii-188. Bartram, A. W. H. (1977): The Macrosemiidae, a Mesozoic family of holostean fishes. Bulletin of the British Museum (Natural History), Geology Series 29:137–234. Ebert, M., Lane, Jennifer A. & Kölbl-Ebert, Martina (2016): Palaeomacrosemius thiollieri, gen. et sp. nov., a new Macrosemiidae (Neopterygii) from the Upper Jurassic of the Solnhofen Archipelago (Germany) and Cerin (France), with a revision of the genus Macrosemius. Journal of Vertebrate Paleontology, DOI: 10.1080/02724634.2016.1196081.
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The first pereiopod is strongly elongated, was used to catch prey, and was more calcified than the rest of the body. Mecochirus was probably a bottom-dwelling reef inhabitant. On the plate are also several specimens of the swimming crinoid Saccocoma tenella GOLDFUSS, 1831. Line drawing: References: C. E. Schweitzer, R. M. Feldmann, A. Garassino, H. Karasawa, and G. Schweigert. 2010. Systematic list of fossil decapod crustacean species. Crustaceana Monographs 10:1-222
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From the album: Invertebrates
Mecochirus longimanatus Schlotheim, 1820 Late Jurassic Tithonian Langenaltheim Obere Haardt Bavaria Germany