Antrimpos speciosus Münster, 1839

(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