Tylodinus spiniventris, Luna-Cozar & Anderson & Jones & León-Cortés, 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 : 33

Tylodinus spiniventris species group

Recognition. The species of this group are distinguished from other Tylodinus by having in combination the body moderately robust, black, with the tubercles in front of the base of the elytral declivity similar in size, and median section of abdominal ventrites 1–2 glabrous.

Diagnosis. Body approximately 2.1x longer than wide, black. Head with punctures similar to punctures on rostrum, scales yellow to light brown; vertex with yellow scales, overlapping, uniformly distributed along vertex; frons moderately concave; rostrum moderately robust, surface moderately carinate, apical area puncticulate, eyes moderately convex. Pronotum in lateral view strongly convex, outline with anterior constriction and without posterior constriction ( Figure 10 ); in dorsal view with sides slightly divergent from base to midlength, then convergent to apex, constricted beyond the middle ( Figure 14 ); disc with longitudinal impression; surface with dense and deep punctures on flanks, becoming smaller and scattered towards middle, with yellow to light brown scales, very dense on lateral area and flanks, anterior area, forming a thick longitudinal fringe along middle and narrow strip that diverges from middle of base to flanks, and with dark scales on middle and posterior areas of disc; surface without granules. Elytra black, basal margin slightly sinuate ( Figure 3 ), surface without granules, striae 10 incomplete. Elytra with tubercles as follows: I2 with weak tubercle at base of elytral declivity, I3 with two tubercles, first subbasal and other on middle of elytral, I4 with two tubercles very weak, first tubercle between tubercles on I3 and other little in front on elytral declivity, not longer than tubercle on I2, I5 with two tubercles similar in size and position to tubercles on I3, I7 with only one sub basal and weak tubercle. Metasternum concave, median section glabrous, metasternal tooth absent. Male abdomen with ventrites 1–2 almost on same plane as ventrites 3–5; ventrite 1 concave, glabrous at median section; ventrite 2 concave to feebly concave, longer than ventrites 3–4 combined, glabrous at median section; ventrite 5 flat, as long or longer than ventrite 1, with an anterior medial impression, female with a spine-shaped projection on ventrite 5 (one species) or not. Legs narrow, femora armed, hind femora length not reaching the elytral apex, tibiae subparallel, premucro absent. Male genitalia ( Figures 111–112 ) with median lobe in lateral view moderately or strongly curved, stout or moderately stout; in ventral view as long as half-length or equal to apodeme length, lateral sides straight, subparallel, apex truncate or blunt; apical process in lateral view not curved, straight, very small (<0.17 as long as median lobe body), in ventral view not constricted beyond the median orifice, lateral sides convergent to apex. Female genitalia with tergite eight trapezoidal, apex slightly curved, apical margin smooth; sternite eight doliform, with the apex not constricted, median membranous area 1/3 as long as basal plate length, spermatheca shallowly curved, outer margin of corpus convex, ramus and nodulus indistinct.

Figures

FIGURES 1–11. 1–5. Dorsal outline: 1. Generalized Tylodinus, indicating terminology used in this study. Key: letters indicate areas of pronotum. A, anterior area; B, median area; C, posterior area; a, anterior of lateral area; b, median section of lateral area; c, median section of dorsal area; d, anterior section of dorsal area; e, posterior section of lateral area; f, posterior section of dorsal area. 2. Tylodinus variabilis, note elytra basal margin straight. 3. Tylodinus ixchel, note elytra basal margin slightly sinuate. 4. Tylodinus immundus, note elytral basal margin sinuate. 5. Tylodinus elongatus, note elytra basal margin very sinuate. 6–11. Lateral outline: 6. Tylodinus complicatus, male, note ventrites 3–5 in same plane as ventrites 1–2. 7. Tylodinus variabilis, male, note ventrites 3–5 not in same plane as ventrites 1–2. 8. Tylodinus coapillensis, female, note ventrites 1–2 strongly convex, ventrites 3–5 not in same plane as ventrites 1–2. 9. Tylodinus zilchi (schematic). 10. Tylodinus sepulturaensis (schematic) 11. Tylodinus rugosus (schematic).

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 110–119. Ventral and lateral habitus of median lobe: 110. Tylodinus sepulturaensis, 111. Tylodinus lum, 112. Tylodinus spiniventris, 113. Tylodinus mutabilis, 114. Tylodinus parvus, 115. Tylodinus pusillus, 116. Tylodinus porvenirensis, 117. Tylodinus elongatus, 118. Tylodinus complicatus, 119. Tylodinus rufus.