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......Astaenosiagum Martínez, 1957

Melolonthinae Tribes
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Astaenosiagum longipes (F. Philippi): Homotype male.
Photo by Kerry Katovich.
Distribution of Astaenosiagum longipes.

Distribution: Astaenosiagum longipes: Chile


Generic Diagnosis: This genus is identified by its elongate body, small size, body appearing flattened in lateral profile, quadrate prementum, with ventral surface medially grooved (Fig. 1); oblong pronotum, lateral margins serrate; (Fig. 2); elytra with vestiture of long, whitish setae; large, subtriangular pygidium.(Fig. 3).

Fig. 1 Prementum,
ventral view
Fig. 2 Pronotum,
dorsal view
Fig. 3 Pygidium,
caudal view

Generic and species Diagnosis:
: Prothorax at widest point 3.8 mm, elytra at widest point 6.0 mm, length 10.5 mm.

Color and vestiture: Body reddish brown, with vestiture consisting of long whitish setae.

Head: Clypeus coplaner with frons; frons angled at 30°; labrum in frontal profile narrow, ovate, weakly emarginate; labium with prementum quadrate, ventral surface with a broad, shallow medial groove; antennae 9-segmented, segments 7-9 forming an elongate club, the length of which equal to combined length of segments 2-6.

Prothorax: Pronotum oblong, transverse, widest medially, anterior angles obtuse, lateral margins convex, serrate, posterior angles obtuse, posterior margin straight, medially lobed; coxae transverse, tibia with dorsal margin bidentate; pretarsus with claws divergent, equal in length, claws widely split.

Mesothorax: Scutellum subtriangular; elytra longer than wide, widest medially, elytral epipleuron narrow, flattened, dorsal surface with weak striae, interstrial regions slightly raised, surface with short, white setae, anterior umbone well developed, posterior umbone absent; pretarsus similar to prothoracic pretarsus.

Metathorax: Metathoracic leg with coxae narrowly separated; femur narrow, widest medially; tibia vase shaped, widest medially, narrowed in proximal 1/4, posteroventral margin lacking spurs, posterior margin with a shallow, U-shaped groove; pretarsus with claws similar to those of prothoracic legs.

Abdomen: Ventrites 1-3 equal in length, 4th ventrite (= propygidium) equal in length to ventrites 2-3 combined, posterior margin membranous, ventrite and sternite of 4th abdominal segment not separated by a distinct suture; 5th ventrite equal in length to that of ventrite 2; pygidium large, subtriangular, width subequal to length.


Astaenosiagum is monotypic.
Astaenosiagum longipes (F. Philippi), 1861 (type species by designation)
Type location: Holotype located at the MNNC



Philippi F. H. 1861. Observaciones sobre los Lamelicornios de Chile, descriptos en la obra del Senor Gay, con descripcion de algunas especies nuevas. Anales de la Universidad Chile 18: 735-742.

Martinez, A. 1957. Nuevos Generos Y Especies De Macrodactylini (Col. Scarab. Melolonthinae). Scarabaeoidea Neotropica V. 3: 47-51.

Notes: The distinctive serrate pronotum and elytra with vestiture of long, whitish setae will separate this genus. This genus appears to be more flattened in lateral view than other macrodactylines. This beetle was originally described in the genus Schizochelus by Philippi and later designated as a distinct genus by Martinez.


Larvae: Unknown


Astaenosiagum longipes (F. Philippi) 1861: 738
This species is characterized by its oblong pronotum, with lateral margins finely serrate; elytra with vestiture of long, whitish setae; and large, subtriangular pygidium.


Astaenosiagum longipes (F. Philippi): Homotype male.
Photo by Kerry Katovich.
Caudal view
Lateral view
Dorsal view
Genitalia male.
.... Entomology Home Research UNSM Entomology Database Scarab Workers

Author: Kerry Katovich
Generated on: 15/SEP/2005
..... Last modified: 20/FEB/2007
UNL State Museum - Division of Entomology