Aeger tipularius (Schlotheim, 1822) (Fig. 1 A-C)

DIAGNOSIS (from Schweigert et al. 2016). — Very short smooth rostrum; Mxp3 extremely long, with movable spines; chelate P1-P3; P1-P2 bearing long movable spines; P3 with spiny chelae; achelate P4-P5 and spineless; P3 slightly larger than P1-P2; well-developed pleopods; uropodal exopod with rounded diaresis.

STUDIED MATERIAL. — Charbonnier & Garassino (2012) listed seven specimens. Careful examination leads us to re-identify some of them. Three specimens, MNHN.F.A33509 (Solnhofen), B13443 (Eichstätt), MNHN.GG.2004/8072 (unknown locality), are maintained as A. tipularius, while four others are attributed to Aeger spinipes (Desmarest, 1817), A. insignis (Oppel, 1862), and Acanthochirana cordata (Münster, 1839) .

COMMENTS

Our assignation is based on the very short and smooth rostrum. The carapace groove pattern typical of Aeger – with a cervical groove steeply inclined, not joined to the dorsal margin but joined to the antennal groove; an oblique and sinuous branchiocardiac groove crossing all the carapace from the posterior margin to the hepatic region; and a hepatic groove joined anteriorly to the cervical groove and posteriorly to the branchiocardiac groove (see diagnosis in Charbonnier et al. 2017: 36) – is particularly visible on specimen A33509 (Fig. 1A, B).