Bucculentum, Schweitzer & Feldmann, 2009

Krzemińska, Ewa, Starzyk, Natalia, Fraaije, René H. B., Schweigert, Günter & Lukeneder, Alexander, 2021, Jurassic brachyurans of the genus Bucculentum, Zootaxa 5032 (3), pp. 395-410 : 406

Genus Bucculentum , key to the species

1. Metabranchial region nearly as wide as hepatic region; epibranchial region only c. 1/3 as wide as hepatic region........................................................................................ B. plettenbergense , n. sp.

- metabranchial region narrower than hepatic region......................................................... 2.

2. Augenrest vertical to long body axis or almost so (dorsal view)............................................... 3.

- augenrest oblique, aligned with proximal portions of hepatic regions.......................... B. horstkuscheli , n. sp.

3. Suborbital spur divided; in frontal view augenrest is close to dorsal side of carapace ( Fig. 1D ) and flanked with several small tubercles................................................................................ B. bachmayeri .

- suborbital spur undivided; in frontal view augenrest is close to ventral side of carapace ( Fig. 1B ) and flanked laterally with one elongated protuberance.................................................................... B. bucculentum .

Figures

FIGURE 1. Nomenclature of carapace and ground plans of species of Bucculentum: A, B, Bucculentum bucculentum (dorsal and frontal view, respectively); C, D, Bucculentum bachmayeri (dorsal and frontal view, resp.); E, F, Bucculentum horstkuscheli, n. sp. (dorsal and frontal view, resp.); G, Bucculentum plettenbergense, n. sp., dorsal view (a, augenrest; ag, augenrest groove; bcg, branchio-cardiac groove; c, cardiac region; cg, cervical groove; h, hepatic region; ebr, epibranchial region; mbr, metabranchial region; mg, mesogastric region; msbr, mesobranchial region; pcg, postcervical groove; s, suborbital spine).