Konidromites gibbus (Reuss, 1858)

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 : 36-37

Konidromites gibbus (Reuss, 1858)

Figure 20

1858 Oxythyreus gibbus Reuss , p. 12.

1859 Oxythyreus gibbus Reuss ; Reuss, p. 75, pls 23.6, 24.8.

1869 Oxythyreus gibbus Reuss ; Gemmellaro, p. 18.

1895 Oxythyreus gibbus Reuss ; Remeš, p. 6, pl. 1.5. 1895 Oxythyreus minor Remeš , p. 6, pl. 1.6.

1929 Oxythyreus gibbus Reuss ; Lőrenthey and Beurlen, p. 96, pl. 4.3.

1969 Oxythyreus gibbus Reuss ; Glaessner, R489, fig. 301.2.

2006 Oxythyreus gibbus Reuss ; Shirk, p. 95, fig. 26.

2010a Konidromites gibbus (Reuss) ; Schweitzer and Feldmann, p. 365, fig. 1.

2012b Konidromites gibbus (Reuss) ; Schweitzer et al., p. 20, fig. 12.1.

2016 Konidromites gibbus (Reuss) ; Hyžný and Zorn, p. 129, pl. 1.4, 1.5a-d.

2018 Konidromites gibbus (Reuss) ; Schweitzer et al., p. 331, fig. 15.

Diagnosis. See Schweitzer and Feldmann (2010, p. 364).

Material studied. NHMW 1990/0041/5082, 1990/ 0041/5104, 2014/0194/0669: Late Jurassic (Tithonian) specimens from the coral reef Ernstbrunn Limestone of the Ernstbrunn quarries (Google Earth coordinates: 48.54, 16.35), Austria (Schweitzer and Feldmann, 2009d; Schneider et al., 2013).

Occurrence. Late Jurassic (Tithonian) of Europe ( Austria, Czech Republic, Italy, and Romania).

Dimensions. (In mm) NHMW 1990/0041/5082: max. length excl. rostrum (L)=12.5, max. width excl. projections (W)=10.0; 1990/0041/5104: L=6.0, W=4.8; 2014/0194/0669: L=2.4, W=1.8; 1990/0041/3475: L=12.2, W=10.0.

Description. Referral is made to Schweitzer and Feldmann (2010a, 366-367). Additionally: small and a larger specimen with fairly continuous orbital rim with indent laterally. Orbital cavity narrow. Rostrum downturned and triangular, reaches height of lower orbital rim in frontal view, with median groove. For larger specimens, fronto-orbital width relative to maximum width relatively small (0.49 vs 0.56) and less convex transversely ( Figure 20 ).

Remarks. This species has been figured many times (see synonymy list), but frontal and orbital views have never been provided thus far. Ontogenetic change appears limited, with only the transverse convexity of the dorsal carapace being a bit more pronounced in the small relative to the large specimen.

Figures

FIGURE 20. A large and small specimen of the crab Konidromites gibbus (Reuss, 1858) from the Late Jurassic (Tithonian) of Ernstbrunn, eastern Austria. A, C, E, dorsal, left-lateral, and frontal views, resp. (NHMW 2014/0194/0669). B, D, F, G, dorsal, left-lateral, frontal, and left-orbital views (NHMW 1990/0041/5104). Scale bar width equals 2.0 mm.