( Fig. 3)
STUDIED MATERIAL. — Charbonnier & Garassino (2012) mentioned six specimens: three specimens from Solnhofen (MNHN.F. A33519, A33548, R03502); two specimens from Eichstätt ( MNHN.F. A33504, B13465) and one specimen from an unknown locality ( MNHN. GG.2004/8086). Collections Boué, de Roissy, Hoffstetter, Manchester Museum, d’Orbigny.
COMMENTS
Specimen MNHN.F. A33504 ( Fig.3 A-C) shows a well-preserved rostrum and a well-marked hepatic spine, while specimen A33519 ( Fig.3G, H) shows evidence of preserved muscle fibres near somites 1 and 2 (see also Briggs et al. 2005). For comparison, specimens from the Carnegie Museum of Natural History (CM-33420; from Robalino et al. 2016; Fig. 3D, E) and from the private collection of Roger Frattigiani (Laichingen, Germany; figured in Schweigert 2015: fig. 568 and Fig. 3F) are also illustrated.
Antrimpos undenarius Schweigert, 2001 ( Figs 4; 5)
TRANSLATION OF THE DIAGNOSIS (from Schweigert 2001). — Largesized species of the genus Antrimpos, rostrum with 11 dorsal spines, the posterior one [= hepatical spine] being separated from the others, and one ventral spine located just before the foremost dorsal spine. Long propodite on P3.
STUDIED MATERIAL. — Charbonnier & Garassino (2012) did not mention this species. Nine specimens MNHN.F. A06834, A49608, A49609, A49610, A49615, A49616, A49622, A49623 and A49624 from Nusplingen were re-discovered in the Collection d’Orbigny. All these specimens are labelled “Nusplingen, Mr Béroldingen, 13 e ” ( Fig. 4A). The family von Beroldingen is an old family of nobles originating from Switzerland; Baron Franz Coelestin von Beroldingen ( 1740-1798) was known as a mineral and fossil collector and after his death, his nephew, Count Joseph Ignace von Beroldingen (1780-?), sold his mineral collection to the London museum ( British Museum of Natural History 1904). In our case, “Mr Béroldingen” refers to Paul Ignaz Josef Graf von Beroldingen ( 1804-1875), another nephew of Baron von Beroldingen, who offered the Antrimpos specimens from Nusplingen to Alcide d’Orbigny. von Beroldingen probably got them by exchanging fossils with Oscar Fraas ( 1824-1897) as the two of them knew each other. Indeed, in a letter from 1863, “Mr Béroldingen” mentioned several fossils from the Tertiary of Swabia, including the Jurassic taxon Squatina acanthoderma from Nusplingen, which was described by Oscar Fraas in 1855 ( Mayer 1976). Number “13 e ” refers to the thirteenth geological stage of d’Orbigny, which is the Oxfordian. Additional specimens of A. undenarius coming from the SMNS collection are presented in Fig. 5 for comparison.
COMMENTS
According to Schweigert (2017), Antrimpos undenarius is the most abundant prawn of the Nusplingen Plattenkalk. The d’Orbigny specimens are characteristically preserved by a coating made of iron oxides ( Figs 4B, D, E, H; 5 A-E) and embedded in relatively coarse lithographic limestones. The orientation of the corpses (pleon in lateral view and carapace in dorso-ventral view, as in Figs 4H; 5 A-C, E) is also characteristic of the fossil prawns from Nusplingen. Thus, the preservation in complete dorsal view, as for A49610 ( Fig. 4D) and SMNS 66122 ( Fig. 5F) is rather rare. Furthermore, the preservation in 3D of the rostrum is particularly remarkable on specimens SMNS 80482 and SMNS 66122 ( Fig. 5C, F). On specimens housed at the MNHN, the diagnostic anatomical characters of the species are poorly preserved and observed alternatively in several specimens ( Fig. 4C, E, G). For instance, the rostrum with numerous dorsal teeth ( Fig. 4G), the strong hepatic spine, the hepatic ridge, the median lateral processes on s1-s3 are typical of Antrimpos. The large size of the specimens is compatible with A. undenarius.
Infraorder ASTACIDEA Latreille, 1802 Superfamily ERYMOIDEA Van Straelen, 1925