Kojderus Magnien & Gierlasiński, 2024

Gierlasiński, Grzegorz, Magnien, Philippe, Kepel, Andrzej, Wiśniewski, Konrad & Lange, Aleksandra, 2024, Kojderus maximus, a new genus and species of Tessaratomidae (Hemiptera: Heteroptera), the first Natalicolinae from Madagascar, Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 64 (2), pp. 327-335 : 332-333

Key to the genera of Natalicolinae

This key is modified from the one given by KUMAR (1974), with the addition of Kojderus Magnien & Gierlasiński gen. nov., and correction of a problem concerning the genera Selenymenum Montandon, 1894 and Stevesonius Rider, 1998 (= Phyllocoris Jeannel, 1913 ), for which it would have given the opposite result. However, examination of Jeannel’s type of Stevesonius acutus Jeannel, 1913 and of his descriptive drawings ( JEANNEL 1913) clearly agrees with a narrow mesosternal carina. Validity of the distinguishing characters of Selenymenum and Stevesonius is uncertain and requires further study.

The key relies on the presence of at least the first three antennomeres of one antenna. If the studied specimen is completely missing its antennae, using Table 1 should reduce the possible choices to no more than two genera. Comparing the habitus of these genera using the online catalog ( MAGNIEN 2024) should allow for final identification.

1 Antennae pentamerous. ............................................ 2

– Antennae tetramerous. .............................................. 3

2 Antennomere II less than half as long as I. Africa. ..... .................................... Encosternum Spinola, 1850

– Antennomere II longer than I. India. ........................... ......................................... Empysarus Martin, 1904

3 Antennomere II about half as long as III. .................... ........... Kojderus Magnien & Gierlasiński gen. nov.

– Antennomere II about as long as or longer than III. ... 4

4 Antennomeres II and III subequal in length, abdomen ovoid. ........................................................................ 6

– Antennomere II about 1.5 times longer than III, abdomen broadly rounded. ............................................... 5

5 Antennae slender, long, ocelli close to each other (interocellar distance about 1/4 of head width), anterior margins of pronotum slightly concave, regularly tapering forwards. ....................... Cyclogastridea Reuter, 1884

– Antennae stouter, shorter, ocelli farther from each other, closer to the eyes (interocellar distance about 1/3 of head width), anterior margins of pronotum broadly concave, its anterior third almost perpendicular to body axis. ................. Natalicola Spinola, 1850

6 Corium dotted with small white calloused tubercles. .. ................................... Elisabetha Schoudeten, 1916

– Corium without small white calloused tubercles. .... 7

7 Metasternal carina broad, extending laterally between meso- and metacoxae. ... Haplosterna Westwood, 1837

– Metasternal carina thin, elevated, not extending between meso- and metacoxae. ................................ 8

8 Metasternal carina broader posteriorly. ....................... ............................. Selenymenum Montandon, 1894

– Metasternal carina narrow, tapering posteriorly. ......... ........................................... Stevesonius Rider, 1998