Anomonyx Saylor, 1940

Katovich, Kerry, 2008, A generic-level phylogenetic review of the Macrodactylini (Coleoptera: Scarabaeidae: Melolonthinae), Insecta Mundi 2008 (23), pp. 1-78 : 19-21

Anomonyx Saylor, 1940

( Figure 17-21 )

Anomonyx Saylor, 1940: 46 . Type species Anomolonyx uruguayensis Moser, 1921 , by monotypy.

Taxonomic Notes

The following generic diagnosis is based on a single dissected paratype of the generic type species A.

uruguayensis (ZMHB) .

Generic diagnosis

This genus is characterized by its rotund body and rounded elytral shape; long labial palpi, ventral surface of the quadrate prementum with a raised U-shape surface, and the antennae with 8 antennomeres, with antennomeres 6-8 forming the elongate club, club length equal to length of antennomeres 2-5 combined.

Generic redescription

Measurements: Prothorax at widest point 6.0 mm, elytra at widest point 8.0 mm, length 14.2 mm.

Color and vestiture: Body reddish brown, vestiture consisting of golden setae dorsally and ventrally,

strongly setose ventrally.

Head: Clypeus not coplanar with frons; frons angled at 60 o; labrum in frontal view ovate, medially with a deep emargination, labrum not coplanar with clypeus; labium with prementum quadrate, ventral surface forming a raised, U-shaped transverse ridge ( Fig. 19 ); mandibles in dorsal view semicircular, scissorial area bluntly produced, medially with a slight emargination, posterior margin of scissorial area produced into a blunt point, molar area lobed, weakly sclerotized; maxillary palpi with apical palpus ovate, equal to segments 2-3, apically blunt, surface flattened on adoral margin; antennae 8-segmented, segments 6-8 forming the club, equal to length to segments 2-5 combined ( Fig. 20 ).

Prothorax: Pronotum oblong, transverse, widest in posterior 1/3, anterior angle obtuse, lateral margin convex, posterior angle obtuse, posterior margin straight, medially lobed, dorsal surface rounded; prothoracic legs with coxa transverse; tibia dentate, pretarsus with claws slightly divergent, equal in length, both claws narrowly split, upper and lower lobes of each claw narrow, base of claw weakly toothed.

Mesothorax: Scutellum narrowly subtriangular; elytra longer than wide, width fairly uniform ( Fig. 21 ), elytral epipleuron flattened, weakly grooved, dorsal surface lacking striae, anterior umbone weakly produced, posterior umbone absent; pretarsus similar to prothoracic pretarsus.

Metathorax: Coxa narrowly separated; femur ovate, widest in proximal 1/4; tibia triangular, narrow in proximal 1/4, widest medially, posteroventral margin with a single long spur, spur arising at same level as tarsal articulation joint, posterior margin with a deep, U-shaped groove; pretarsus with claws similar to prothoracic claws.

Abdomen: Ventrites 2-4 equal in length, sutures distinct, 5 th ventrite (= propygidium) equal to length of ventrites 1-4 combined, posterior margin membranous, ventrite and sternite of 5 th abdominal segment lacking suture, spiracle in posterior 1/4, situated at apex of triangular groove, 6 th ventrite 1/2 length of 5 th ventrite length, slight membranous margin on posterior margin; pygidium subtriangular, wider than long, posterior margin rounded.

Diversity and Geographic distribution The monotypic Anomonyx ( A. uruguayensis ) is recorded only from Uruguay.

Figures

Figure 17-21. Anomolonyx uruguayensis Moser (male). 17) Dorsal habitus. 18) Left lateral view. 19) Prementum, ligula and labial palpi, ventral view. 20) Antenna. 21) Elytra, dorsal view.