Dolichosyne, Ponomarenko, 1969

Yan, Evgeny V., Beutel, Rolf G. & Ponomarenko, Alexander G., 2017, Ademosynidae (Insecta: Coleoptera): A new concept for a coleopteran key taxon and its phylogenetic affinities to the extant suborders, Palaeontologia Electronica 5 (8), pp. 1-22 : 5-6

Dolichosyne : Ponomarenko, 1969, p. 126

Type species. Dolichosyne confragosa Ponomarenko, 1969 ; by original designation.

Differential diagnosis. Protrochantins more or less rectangular, length and width equal; apex of prosternal intercoxal process with lateral protru-

TABLE 2. Genera of † Ademosynidae .

1. Prosternal intercoxal process parallel-sided, or widening apically, 2

often with lateral tongue-like projections at its apex; elongate-oval beetles, body length exceeds maximum width 2,5-3 times (except some Ademosyne )

- Intercoxal process acute, narrowing posteriorly; Cephalosyne Ponomarenko ,

transverse, stout beetles, body at most two times as long 1969

as maximum width. Mesocoxae widely separated by anterior process of metaventrite; metanepisterna with thick median longitudinal ridge

2. Anterior prosternal margin almost straight, very slightly concave; Gnathosyne Ponomarenko, 1977

metacoxae three times as wide as long, not narrowing laterally

- Anterior prosternal margin distinctly curved; metacoxae 3

narrowing laterally

3. Anterior margin of metanepisterna straight; anterior process of Petrosyne Ponomarenko, 1969

metaventrite elevated

- Outer angles of metanepisterna protruding forward; 4

anterior process of metaventrite not elevated

4. Head hypognathous, less than half as wide as posterior pronotal Sphaerosyne, Ponomarenko ,

margin. Body strongly convex, almost as long as wide 1969

- Head prognathous, less than twice as narrow as basal 5

margin of pronotum; body elongated

5. Protrochantins more or less rectangular, length and width equal; Dolichosyne Ponomarenko, 1969

apex of prosternal intercoxal process usually with lateral protrusions

(if not, then mandibles with distinctly curved apices and pronotum with median longitudinal depression); metacoxal width two times exceeding length, coxae with maximum length medially

- Protrochantins transverse, more than three times as wide Ademosyne Ponomarenko, 1969

as long; metacoxal width more than four times exceeding length, coxae weakly narrowing laterally sions (if not, then mandibles with distinctly curved apices and pronotum with median longitudinal depression); metacoxal width two times exceeding length, coxae with maximum length medially.

Revised description. Head prognathous, large, at least 0.3 shorter than pronotum, rectangular, with pronotum covering at least basal fourth; moderately retracted into prothorax; subocular sutures on ventral side present. Pronotum with lateral bead; pronotal disk strongly convex. Posterior pronotal margin strongly bisinuate, paranotalia triangular. Anterior prosternal margin located distinctly posterior to anterior margin of pronotum, distance about fourth of pronotal length. Prosternum as long as globular, widely separated procoxae. Prosternal process widened at apex, in some cases with pair of lateral protrusions. Scutellar shield small, ovoid. Species included. Dolichosyne confragosa ; D. rostrate ; D. sulcata .