Undetermined chelae

Ossó, Àlex & Gagnaison, Cyril, 2019, An appraisal of the Middle-Late Miocene fossil decapod crustaceans of the ‘ Faluns’ (Anjou-Touraine, France), Geodiversitas 41 (9), pp. 367-383 : 378

Undetermined chelae ( Fig. 5 J-M)

MATERIAL EXAMINED AND MEASUREMENTS (in mm). — Left chela palm, ULB-SO-14: L = 14.5, W = 17. — Right chela palm: ULB- SO-13: L = 14, W = 20.

LOCALITY AND HORIZON. — ‘La Sonneterie’ quarry, Meigné-le- Vicomte (Maine-et-Loire). ‘Savignean facies’, Langhian-Serravallian (Middle Miocene).

DESCRIPTION

Propodi with massive palm slightly subtrapezoidal, stout, higher distally; outer and inner surface convex, completely smooth. Upper and lower margin rounded, smooth. Pollex broken, appears short, with flattened molariform teeth. Carpus rounded, smooth; blunt tooth at upper inner angle.

REMARKS

Due to their incompleteness and the lack of dactyli, or carapaces to they may be related, a generic or familial assignation is not clear. However, in view of the features displayed, they could belong to Carpilioidea or Xanthoidea but even to other superfamilies as well.

Figures

FIG. 5. — A, B, Liocarcinus sp., MS2012 0 172b: A, dorsal view; B, frontal view; C, D, Necronectes michelini (A. Milne-Edwards, 1861): C, ULB-SO-9, right dactylus; D, ULB-SO-10, left dactylus; E, Paguristes gagnaisoni Gagnaison, 2012, MS2006 FS 134b, right chela; F-I, Xantho cf. moldavicus (Yanakevich, 1977): F, ULB-SO-11, left chela, inner lateral view; G, outer lateral view; H, ULB-SO-12, left chela, outer lateral view; I, frontolateral view; J-M, undetermined chelae: J, ULB-SO-13, lateral view of right chela; K, frontal view; L, ULB-SO-14, lateral view of left chela; M, close-up showing an encrusted colony of bryozoans. Scale bars: A, B, 5 mm; C-M, 10 mm. Photographs by À. Ossó.