Tylodinus exiguus Luna-Cozar, 2014

Luna-Cozar, Jesús, Anderson, Robert S., Jones, Robert W. & León-Cortés, Jorge L., 2014, A taxonomic monograph of the genus Tylodinus Champion (Coleoptera: Curculionidae: Cryptorhynchinae: Tylodina) of Chiapas, Mexico, Zootaxa 3788 (1), pp. 1-63 : 23

8. Tylodinus exiguus Luna-Cozar , sp. nov.

( Figures 16 , 42–43 , 98b , 104 , 132 )

Diagnosis. Length male, 2.1 mm. Width male, 1.0 mm. As for T. buchanani , with the following exceptions: head with the frons moderately concave, rostrum with apical area puncticulate. Pronotum in lateral view moderately convex; disc with large punctures, scales yellow with intermixed whitish scales. Tubercles on I 2 in front of elytral declivity smaller than tubercle on I4 at same position, I6 with very small tubercle between tubercles on I5, without tubercles on I7; surface with large punctures; striae 10 complete. Metasternal tooth absent. Male abdomen with ventrites 3–5 not in same plane as ventrite 1–2, ventrite 1 feebly concave, glabrous, as long as 3–4 combined, ventrite 2 with a transverse line of scales, feebly concave, ventrite 5 convex along median line, as long as ventrite 1 without impressions. Femora armed, hind femora length reaching elytral apex, front tibiae with apical ¼ curved, middle and hid tibia subparallel and slightly curved. Male genitalia ( Figure 104 ) in lateral view stout, as long as half apodeme length; in ventral view with lateral sides straight, convergent; apical process weakly curved. Female unknown.

Geographic distribution. México (Chiapas).

Habitat and elevation. The holotype was collected from leaf litter in high elevation cloud forest at 2000 m.

Derivation of specific name. Name derived from Latin word exiguus = small, scanty, short.

Material examined. Total 1 male. Holotype male ( CMNC): México: Chiapas, Motozintla , 7 km SSW Motozintla de Mendoza, elev. 2000 m (15°19'40.8''N, 92°16'34.7''W), 17.ix.1992, coll. R. S. Anderson.

Figures

FIGURES 12–19. 12. Tylodinus pusillus head a) male, b) female. 13–14. Dorsal habitus of pronotum showing the lateral side of pronotum 13. Tylodinus andersoni, 14. Tylodinus porvenirensis. 15–17. Dorsal habitus: 15. Tylodinus rugosus, 16. Tylodinus exiguus, 17. Tylodinus jonesi. 18. Tylodinus coapillensis note tubercle on elytra declivity base, 19. Tylodinus elongatus showing metasternal tooth.

FIGURES 36–43. Dorsal and lateral habitus: 36–37. Tylodinus pseudocavicrus, 38–39. Tylodinus rugosus. 40–41. Tylodinus buchanani. 42–43. Tylodinus exiguus.

FIGURES 92–99. 92–99. Dorsal and lateral habitus: 92–93. Tylodinus gibbosus, 94–95. Tylodinus kissingeri, 96–97. Tylodinus pinguis. 98. Median lobe apex of: a) Tylodinus elongatus, b) Tylodinus exiguus, c) Tylodinus pseudocavicrus, d) Tylodinus rufus, e) Tylodinus rufus (squashed), 99. Tylodinus zilchi, ventral and lateral habitus of median lobe.

FIGURES 100–109. Ventral and lateral habitus of median lobe: 100. Tylodinus andersoni, 101. Tylodinus cavicrus, 102. Tylodinus pseudocavicrus, 103. Tylodinus rugosus, 104. Tylodinus exiguus, 105. Tylodinus ixchel, 106. Tylodinus jonesi, 107. Tylodinus variabilis, 108). Tylodinus leoncortesi, 109. Tylodinus triumforium.

FIGURES 132–133. Maps showing collecting sites. 132. Occurrences in Chiapas, México of: Tylodinus intzin, Tylodinus variabilis, Tylodinus exiguus, Tylodinus mutabilis, Tylodinus wibmeri, Tylodinus elongatus; 133. Occurrences in Chiapas, México of: Tylodinus leoncortesi, Tylodinus buchanani, Tylodinus pusillus, Tylodinus gibbosus, Tylodinus kissingeri, Tylodinus parvus.