Antrimpos speciosus Münster, 1839

Odin, Giliane P., Charbonnier, Sylvain, Devillez, Julien & Schweigert, Günter, 2019, On unreported historical specimens of marine arthropods from the Solnhofen and Nusplingen Lithographic Limestones (Late Jurassic, Germany) housed at the Muséum national d’Histoire naturelle, Paris, Geodiversitas 41 (17), pp. 643-662 : 648-652

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

Figures

FIG. 3. — Antrimpos speciosus Münster, 1839: A-C, specimen MNHN.F.A33504 from Eichstätt: A, visible light; B, UV light; C, line drawing of the specimen; D, E, specimen CM-33420 likely coming from Solnhofen (Robalino et al. 2016); D, visible light; E, interpretation of the carapace; F, specimen from Solnhofen (illustrated in Schweigert 2015: fig. 568; private collection of Roger Frattigiani); G, H, specimen MNHN.F.A33519 from Solnhofen; G, full view of the specimen; H, close-up of muscle fibers.Abbreviations:a, branchiocardiac groove; a2, antenna; b, antennal groove; b1, hepatic groove; e1e, cervical groove; egs, epigastric spine; hs, hepatic spine; r, rostrum; rs, rostral spines; sc, scaphocerite; ss, supraorbital spine; Grey line of drawing, hypothesized delimitation. Photographs: L. Cazes (except D: M. McNaugher and F: G. Schweigert). Line drawings: G.P. Odin. Scale bars: A-C, F, G: 2 cm; D, E, H, 1 cm.

FIG. 4. — Antrimpos undenarius Münster, 1839 from Nusplingen, housed at the MNHN: A, picture of the old label; B, C, specimen MNHN.F.A49615; B, natural light picture; C, line-drawing of the grooves; D, specimen MNHN.F.A49610; E, specimen MNHN.F.A49622; F, G, specimen MNHN.F.A49608; F, UV picture; G, line-drawing of the rostrum; H, specimen MNHN.F.A49624. Abbreviations: b, antennal groove; b1, hepatic groove; ct, cephalothorax; e1e, cervical groove; hs, hepatic spine; r, rostrum; rs, rostral spines; s1-s5, pleonal somites; ss, supraorbital spine. Scale bars: B-F, H, 1 cm; G, 2 cm. Photographs: L. Cazes (except A: G. P. Odin). Line drawing: G. P. Odin.

FIG. 5. — Antrimpos undenarius Münster,1839 from Nusplingen,housed at the SMNS:A, specimen SMNS 80480;B, specimen SMNS 80481;C, specimen SMNS 80482; D, specimen SMNS 80483; E, specimen SMNS 24228; F, specimen SMNS 66122. Scale bars: A-F, 2 cm. Photographs: G. Schweigert.