Zygadenia viridis, Soriano & Delclòs, 2006

Soriano, Carmen & Delclòs, Xavier, 2006, New cupedid beetles from the Lower Cretaceous of Spain and the palaeogeography of the family, Acta Palaeontologica Polonica 51 (1), pp. 185-200 : 189

Zygadenia viridis sp. nov.

Figs. 2E , 4A .

Type locality: Las Hoyas fossil site, La Cierva, Serranía de Cuenca , Cuenca Province, Spain .

Stratigraphic horizon: Second lithosome of finely laminated limestones of La Huérguina Formation, Barremian, Lower Cretaceous (Fregenal−Martínez and Meléndez 2000).

Derivation of the name: Named after Latin viridis (young, new).

Material.— Holotype MCCM LH 1805 part and counterpart.

Diagnosis.—Differs from other species with similar size in the strongly notched, saw−like aspect of the pronotum and epipleura edges.

Description.—Measurements: length 7.9 mm, width 4.0 mm; length of abdomen 5.1 mm; elytra length 5.3 mm. Quite small, wide and flattened body. Head with mandibles about 1.5 times as long as wide, narrowing slightly forward; genae and temples longer than eyes; vertex with two longitudinal keels that bear pointed tubercles above eyes and behind their posterior edges. Mandibles quite long, its length about 1/3 of total length of head. Antennae filiform, scape two times longer than pedicel, and four times longer than antennomeres 3–11. Neck−like constriction clear, narrower than head in its wider part. Pronotum transverse, somewhat longer than head with mandibles, narrowed anteriorly; anterior angles drawn out, posterior edges obtuse; exterior margins strongly notched. Disc of pronotum with a medial elevation divided by a longitudinal groove. Prosternum transverse, about 1.6 times as wide as long, and somewhat longer than mesosternum and shorter than metasternum. Mesosternum transverse, nearly 2.2 times as wide as long. Metasternum rather wide and transverse, about two times as wide as long at posterior edge. Abdomen with 5 visible ventrites with marked relief, their posterior half elevated above anterior half; last ventrite about 2.6 times as long as previous one. Elytra 2.5 times as long as wide, apex drawn out into “tail”. Epipleura comparatively wide, with no distinct cells and exterior edges strongly notched. Cells of elytra rounded, approximately 25 cells form a row. Pro− and mesofemora somewhat shorter than pronotum in its shorter part, almost 3.2 times as long as wide. Protibiae quite shorter than profemora, and about six times as long as wide. Abdomen with no apparently puntuation.

Figures

Fig. 2. Barremian (Early Cretaceous) ommatins Tetraphalerus, Cionocoleus (both Ommatini), Brochocoleus (Brochocoleini), and Zygadenia (Notocupedini) from Spain. A. Tetraphalerus ponomarenkoi sp. nov. Holotype MCCM LH 78a, part, Las Hoyas, Cuenca Province. B. Tetraphalerus penalveri sp. nov. Holotype DEPGM LP 0058b, counterpart, La Pedrera, Lleida Province. C. Cionocoleus longicapitis sp. nov. Holotype IEI LP 0164G, La Pedrera, Lleida Province. D. Brochocoleus indibili sp. nov. Holotype IEI LC 4636a, part, La Cabrúa, Lleida Province. E. Zygadenia viridis sp. nov. Holotype MCCM LH 1805a, part, Las Hoyas, Cuenca Province. F. Zygadenia oculata sp. nov. Holotype IEI LC 3675a, part, La Cabrúa, Lleida Province. Scale bars 2 mm.

Fig. 4. Camera lucida drawings of Barremian (Early Cretaceous) ommatin Zygadenia from Spain. A. Zygadenia viridis sp. nov. Holotype MCCM LH 1805a, part, Las Hoyas, Cuenca Province, dorsal (A1) and ventral (A2) aspects. B. Zygadenia oculata sp. nov. Holotype IEI LC 3675a, part, La Cabrúa, Lleida Province, dorsal (B1) and ventral (B2) aspects. Scale bars 2 mm.