Palaeastacus rothgaengerae Schweigert & Röper, 2001

Devillez, Julien & Charbonnier, Sylvain, 2021, Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda), Geodiversitas 43 (2), pp. 25-73 : 49-50

Palaeastacus rothgaengerae Schweigert & Röper, 2001

( Fig. 12A, B )

Palaeastacus rothgaengerae Schweigert & Röper, 2001: 4 , fig. 2. — Garassino & Schweigert 2006: 11. — Schweitzer et al. 2010: 25.

TYPE MATERIAL. — Holotype BSPG 1993 XVIII-200 . TYPE LOCALITY. — Quarry near Brunn , Bavaria, Germany. TYPE AGE. — Kimmeridgian .

DESCRIPTION

Thoracic appendages

Chelate P1; P1 propodus subrectangular; wide P1 fingers, straight, equal in length, as long as propodus; P1 carpus short, subtriangular; P1 merus short, subrectangular.

Ornamentation

P1 propodus covered by small tubercles; inner margin with a row of strong spines directed forward; fingers without ornamentation; P1 carpus covered by small tubercles and with strong spines directed forward on inner margin; P1 merus with strong spines directed forward on dorsal margin.

DISCUSSION

Palaeastacus rothgaengerae is known by a very few isolated P1 with chelae characteristic of Palaeastacus : short and subrectangular propodus, short and wide fingers, and strongly spiny ornamentation.

P. rothgaengerae is clearly distinct among the other species of Palaeastacus by the particular shape of P1 fingers, which gives its characteristic appearance to the chelae. Indeed, the fingers are very wide with strongly rounded inner margin of dactylus and outer margin of index.

Figures

FIG. 12. —Palaeastacus rothgaengerae Schweigert & Röper,2001 and Palaeastacus fuciformis (Schlotheim, 1822) from Germany:A, B, holotype BSPG 1993 XXVIII 200 of P. rothgaengerae from the Kimmeridgian of Brunn quarry: general view (A), schema (B); C, D, holotype MFN 2236 P1383/8 MB.A.0251 of P. fuciformis from the Tithonian of Solnhofen:general view (C), schema of the carapace (D); E, specimen MFN 2236 P1383/7 MB.A.2985 from the Tithonian of Eichstätt;F-G, specimen MFN 2236 P1383/7 MB.A.2992 from the Tithonian of Solnhofen:general view (F), schema (G). Abbreviations:a, branchiocardiac groove;a1, antennulae;a2, antenna; b, antennal groove; b1, hepatic groove; c, postcervical groove; d, gastro-orbital groove; di, diaeresis;e, eye; e1e, cervical groove; i, inferior groove; ip, intercalated plate; Mxp3, third maxilliped; pl, pleopod; PoA, postorbital area. Photographs: C, E, F, J. Devillez; A, G. Schweigert. Line drawings: J. Devillez. Scale bars: 1 cm.