Nodoprosopon ornatum (von Meyer, 1857)

Klompmaker, Adiël A., Starzyk, Natalia, Fraaije, René H. B. & Schweigert, Günter, 2020, Systematics and convergent evolution of multiple reef-associated Jurassic and Cretaceous crabs (Decapoda, Brachyura), Palaeontologia Electronica (a 32) 23 (2), pp. 1-54 : 13-15

Nodoprosopon ornatum (von Meyer, 1857)

Figure 6

1857 Prosopon ornatum von Meyer , p. 556.

1858 Prosopon spinosum von Meyer ; Quenstedt, p.

779, pl. 95.37.

1860 Prosopon ornatum von Meyer ; von Meyer, p.

212, pl. 23.25-23.26.

1867 Prosopon pustulatum Quenstedt , p. 315, pl.

26.13.

1889 Prosopon ornatum von Meyer ; Moericke, p. 60, pl. 6.15.

1966 Nodoprosopon ornatum carpaticum Patrulius , p. 507, fig. 5, pl. 30.8.

1969 Nodoprosopon ornatum (von Meyer) ; Glaessner, R484, fig. 294.3.

1985 Nodoprosopon circinatum Collins in Collins and Wierzbowski, p. 76, pl. 1.1.

1988 Nodoprosopon ornatum (von Meyer) ; Wehner, p. 47, fig. 14, pl. 3.3-3.5.

2000 Nodoprosopon ornatum (von Meyer) ; Müller et al., p. 52, figs. 6, 17G.

2007a Nodoprosopon ornatum (von Meyer) ; Schweitzer et al., p. 104, fig. 2.1-2.2.

2007a Nodoprosopon circinatum Collins in Collins and Wierzbowski; Schweitzer et al., fig. 2.6 (non 2.9).

2009d Nodoprosopon ornatum (von Meyer) ; Schweitzer and Feldmann, p. 116, fig. 10.

2012b Nodoprosopon ornatum (von Meyer) ; Schweitzer et al., p. 24, fig. 15.2.

2018 Nodoprosopon ornatum (von Meyer) ; Schweitzer et al., fig. 18.6.

2018 Nodoprosopon ornatum (von Meyer) ; Schweigert and Kuschel, fig. 19.

Diagnosis. See Schweitzer and Feldmann (2009d,

p. 116).

Material studied. NHMW 1990/0041/0061, 1990/

0041/0063, 1990/0041/0342, 1990/0041/0520,

1990/0041/2967, 1990/0041/3160, 1990/0041/

3475, 1990/0041/3513, 1990/0041/4064,

2007z0149/0010, 2014/0194/0046, 2014/0194/

0070, 2014/0194/1007, all from the coral reef

Ernstbrunn Limestone of the Ernstbrunn quarries

(Google Earth coordinates: 48.54, 16.35), Austria,

Late Jurassic (Tithonian) (Schweitzer and Feldmann, 2009d; Schneider et al., 2013); MAB k3613-

3615, from the sponge-microbial limestones of the

Plettenberg quarry near Schömberg (Google Earth coordinates: 48.21, 8.81), SW Germany, Late

Jurassic (late Oxfordian-early Kimmeridgian); MAB

k3616-3621, from the sponge-microbial limestones of the Am Saufang quarry near Geisingen (Google

Earth coordinates: 47.93, 8.67), SW Germany,

Late Jurassic (late Kimmeridgian); SMNS 70490/1-

3 from the bedded sponge-microbial limestones of

Bad Überkingen-Oberböhringen (Google Earth coordinates: 48.61, 9.79), SW Germany, Late Jurassic (late Kimmeridgian); 1332-I-F/ MP /1332/ 1508/08 and 1535-I-F/ MP /1535/1509/08 from the sponge-microbial limestones of Bzów (Google Earth coordinates: 50.28, 19.31), Poland, Late Jurassic (Oxfordian); 6281-I-F/ MP /6281/1599/12 from the sponge-microbial limestones of Ogrodzieniec (Google Earth coordinates: 50.27, 19.31), Poland, Late Jurassic (Oxfordian).

Occurrence. Late Jurassic (Oxfordian-Tithonian) of Central Europe ( Austria, Czech Republic, Germany, Poland).

Dimensions. (In mm) NHMW 1990/0041/0061: max. length excl. rostrum (L)=~2.9, max. width (W)=2.2; 1990/0041/0063: L=-, W=~4.2; 1990/ 0041/0342: L=~8.1, W=-; 1990/0041/0520: L=-, W=5.8; 1990/0041/2967: L=-, W=-; 1990/0041/ 3160: L=-, W=~3.9; 1990/0041/3475: L=> 9.6, W=7.8; 1990/0041/3513: L=-, W=~3.7; 1990/0041/ 4064: L=~4.0, W=3.3; 2007z0149/0010: L=-, W=~4.9; 2014/0194/0046: L=-, W=-; 2014/0194/ 0070: L=~9.1, W=-; 2014/0194/1007: L=~5.4, W=4.3; MAB k3613: L=5.5, W=-; k3614: L=-, W=5.0; k3615: L=5.7, W=4.5; k3616: L=-, W=5.2; k3617: L=5.2, W=3.5; k3618: L=4.9, W=3.3; k3619: L=-, W=5.0; k3620: L=5.9, W=4.8; k3621: L=-, W=8.0; 1332-I-F/MP/1332/1508/08: L=-, W=4.1; 1535-I-F/MP/1535/1509/08: L=~2.9, W=2.2; 6281-I-F/MP/6281/1599/12: L=-, W=3.4; SMNS 70490/1: L=8.0, W=5.7; 70490/2: L=5.7, W=4.3; 70490/3: L=7.7, W=5.9.

Description. Reference is made to von Meyer (1860, p. 212), translated to English by Schweitzer et al. (2007a, p. 104), and supplemental information in Wehner (1988, p. 48-49). Additionally: orbits poorly known, small portion right orbit preserved ( Figure 6F ), suggesting rather shallow orbit with rim and without fissures.

Remarks. The entire rostrum consisting of three spines as described by Wehner (1988, p. 48) is incomplete in all specimens ( Figure 6 ). The anterolaterally oriented spines at the outer orbital angle were drawn previously (Wehner, 1988, figure 14), but are photographed here for the first time. The subhepatic swelling may be less protruding in larger specimens in dorsal view, and the uro-/metagastric regions are variably expressed. Two Ernstbrunn specimens (1990/0041/4064, 2014/0194/ 0070) lack the two tubercles at the base of the mesogastric region.

Wehner (1988) declared Nodoprosopon circinatum Collins in Collins and Wierzbowski, 1985, a junior synonym of N. ornatum after comparing the actual specimens. Schweitzer et al. (2007a) noted several differences of N. circinatum compared to Nodoprosopon s.s. (including N. ornatum ), but we were not able to verify these differences after studying intraspecific variation within 13 specimens from Ernstbrunn. Thus, we agree and maintain the synonymy proposed by Wehner (1988) here.

Patrulius (1966) erected a new subspecies ( Nodoprosopon ornatum carpaticum ) and noted some small differences between N. ornatum and this taxon, including a greater number of tubercles in the anterior carapace, a smaller number of tubercles in the middle part, and the presence of tubercles on the cardiac region. Our study cannot confirm these differences. Although tubercles are usually present on the middle part of the carapace, we have also observed some specimens (NHMW 1990/0041/3475; Figure 6E ) that do not carry clear tubercles there, but otherwise, appear identical to all other specimens. Thus, we do not elevate this subspecies to the species-level.

Figures

FIGURE 6. Specimens of the crab Nodoprosopon ornatum (von Meyer, 1857) from the Late Jurassic of Central Europe. Specimens originate from the late Kimmeridgian of the Am Saufang quarry near Geisingen, SW Germany (A, C, J); the late Kimmeridgian of Bad Überkingen-Oberböhringen, SW Germany (B); the Tithonian of Ernstbrunn, eastern Austria (D-G); and the Oxfordian of Bzów (H) and Ogrodzieniec (I, K), Poland. A, B, D, E, H, I, dorsal views of carapaces (MAB k3620, SMNS 70490/3, NHMW 2014/0194/1007, 1990/0041/3475, 1535-I-F/MP/1535/1509/08, 6281-I- F/MP/6281/1599/12, resp.). Note central rostral spine in A, C, and H. C, F frontal views of carapaces (NHMW 1990/ 0041/3475, MAB k3620, resp.). G, J, K, left-lateral views (NHMW 1990/0041/3475, MAB k3620, 6281-I-F/MP/6281/ 1599/12, resp.). Scale bar width equals 2.0 mm.