Macrogyrus, REGIMBART, 1882

GENUS MACROGYRUS RÉGIMBART, 1882

( FIGS 2 View Figure 2 , 4B, 4D, 4E View Figure 4 , 5A, B View Figure 5 , 6B View Figure 6 , 7F View Figure 7 , 8A, 8D View Figure 8 , 9A–C View Figure 9 , 10 View Figure 10 , 12A–E View Figure 12 , 13E View Figure 13 )

Type species: Macrogyrus howittii ( Clark, 1866) .

Diagnosis: Within the tribe Dineutini , Macrogyrus can be diagnosed by the following combination of characters: (1) antennae with 9 flagellomeres ( Fig. 5A–B View Figure 5 ), (2) frons with lateral bead ( Fig. 4B, D, E View Figure 4 ), (3) pronotal transverse impressed line present, (4) scutellar shield visible with elytra closed, (5) protibia laterally expanded apically ( Fig. 8A View Figure 8 ), (6) protarsus of male broad, discus present ventrally on protarsomere I (described below) ( Fig. 9A–C View Figure 9 ), (7) metacoxal process bordered posterolaterally ( Fig. 6B View Figure 6 ) and (8) female RT without vaginal shield, gonocoxae elongate ( Fig. 13B View Figure 13 ).

Taxonomy: There are now 54 species of Macrogyrus with the inclusion of the former genus Andogyrus . This genus has never received a comprehensive revision.

Distribution: Found in South America, Australia, New Caledonia, New Guinea and surrounding islands, and Lesser Sunda Islands ( Fig. 14D View Figure 14 ) ( Ochs, 1949, 1953, 1955; Brinck, 1976, 1977; Watts & Hamon, 2010).

Discussion: This genus exhibits a distinct autapomorphy: the male protarsus has protarsomere I with a recessed pit possessing adhesive setae with a different suction cup morphology than the remaining adhesive setae ( Fig. 9A–C View Figure 9 , di). This character was first described by Régimbart (1882a: 433) and dubbed the discus. This feature is a synapomorphy uniting all the Macrogyrus species ( Fig. S9 View Figure 9 ).