Zygadenia siniestri, 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 : 193

Zygadenia siniestri sp. nov.

Figs. 6D , 8A .

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: After the Latin sinister (left).

Material.— Holotype MCCM LH 23515 only the part. Very well preserved beetle lacking antennae and legs. Also from Las Hoyas fossil site, paratype MCCM LH 21291 , part and counterpart of a beetle slightly deformed without abdomen, and MCCM LH 15819 only the part of a specimen lacking head and pronotum. All specimens from Las Hoyas.

Diagnosis.—From species with similar relation between last and penultimate ventrite differs in bigger size. From Z. caudatus Ponomarenko, 1966 differs in the absence of puntuation in whole surface of ventrites and elytra without “tail” in apex.

Description.—Measurements: length 13.9 mm; width 6.6 mm; elytra length 10.1–10.9 mm. Body medium sized. Head transverse, strongly retracted in pronotum, about 1.9 times as wide as long without mandibles; cheeks and temples shorter than eyes, occiput sloped. Eyes comparatively large, nearly as long as mandibles. Neck−like constriction weak. Pronotum transverse, about 2.5 times as wide as long at medial length, widest in its medial length, and roundly narrowing anteriorly and posteriorly; anterior angles produced, its anterior margin incised; posterior angles rounded. Disc of pronotum with a large rectangular elevation divided by a longitudinal furrow. Procoxae rounded and contiguous. Mesosternum about 1.2 times shorter than metasternum. Mesocoxae oval and contiguous. Metasternum transverse, about 1.5 times as wide as long at posterior edge, metepisterna comparatively narrow. Metacoxae suboval, abruptly narrowed laterally. Abdomen with 5 visible ventrites with marked relief, their posterior edge strongly elevated above anterior edge. Last ventrite about three times as long as previous one. Elytra about 1.2 times as long as their combined width, with tapered apex. Epipleura comparatively wide, narrowing towards apex, and with a row of distinct cells. Cells of elytra rounded, elongated at posterior edge of elytra, approximately 25 cells form a row. Mesotibiae comparatively short. Abdomen rather covered with tubercles, larger in last sternite and in anterior edge of each ventrite.

Figures

Fig. 6. Barremian (Early Cretaceous) ommatins Brochocoleus (Brochocoleini) and Zygadenia (Notocupedini), and cupedins Priacma (Priacmini) and Anaglyphites (Mesocupedini) from Spain. A. Zygadenia diazromerali sp. nov. Holotype MCCM LH 12001a, part, Las Hoyas, Cuenca Province. B. Zygadenia martinclosas sp. nov. Holotype IEI LC 2663a, part, La Cabrúa, Lleida Province. C. Zygadenia longicoxa sp. nov. Holotype MCCM LH 908030a, part, Las Hoyas, Cuenca Province, Lower Cretaceous. D. Zygadenia siniestri sp. nov. Holotype MCCM LH 23515a, part, Las Hoyas, Cuenca Province. E. Priacma sanzii sp. nov. Holotype MCCM LH 24524, part, Las Hoyas, Cuenca Province. F. Anaglyphites zherikhini sp. nov. Holotype MCCM LH 15122a, part, Las Hoyas, Cuenca Province. G.?Anaglyphites pluricavus sp. nov. Holotype IEI LP 97Ga, part, La Pedrera, Lleida Province. Scale bars 2 mm.

Fig. 8. Camera lucida drawings of Barremian (Early Cretaceous) ommatin Zygadenia (Ommatini) and cupedin Priacma (Priacmini) from Las Hoyas, Cuenca Province, Spain. A. Zygadenia siniestri sp. nov. Holotype MCCM LH 23515a, part, dorsal (A1) and ventral (A2) aspects. B. Priacma sanzii sp. nov. Holotype MCCM LH 24524, part, dorsal (B1) and ventral (B2) aspects. Scale bars 2 mm.