Tylodinus immundus 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 : 52-53

32. Tylodinus immundus Luna-Cozar , sp. nov.

( Figures 88–89 , 125 , 131 )

Diagnosis. Length male 2.5–3.3 mm, female, 2.9–3.2 mm. Width male 1.2–1.7 mm, female, 1.4–1.6 mm. Body 2.1x longer than wide, black. Head clothed with yellow scales, punctures similar to those of rostrum; vertex with dense to contiguous scales, uniformly distributed along vertex, similar in color and tonality as scales on head; frons moderately concave; rostrum moderately robust, surface moderately carinate, apical area puncticulate. Pronotum in lateral view strongly convex, outline with anterior and posterior constriction ( Figure 11 , 89 ), in dorsal view with sides slightly divergent from base to midlength, then convergent to apex, constricted beyond middle; disc longitudinally hollowed, punctures dense to contiguous at base and progressively more widely spaced, smaller and shallower towards apex; disc clothed with yellow scales, very dense on lateral sides and flanks, anterior area forming thick longitudinal fringe along middle and narrow strip that diverges from middle base to flanks, and with dark brown or black scales on middle and posterior areas of disc ( Figures 14 , 88 ), surface with small punctures and without granules. Elytra black, sometimes with dark red coloration along interval 1–2, basal margin sinuate ( Figure 4 ), surface granulate; tubercle distribution as follows: I2 with small round tubercle on elytral declivity base, I3 with two tubercles, first tubercle subbasal, second on middle of elytral declivity, I4 with two small tubercles, first between tubercles on I3, second on base of elytral declivity and same size as tubercle on I2, I5 with two small tubercles in same position as tubercles on I3, I6 with very small tubercle between tubercles on I5, tubercles on I3 longer than other tubercles. Metasternum flat, glabrous, metasternal tooth absent. Male abdomen with ventrites 3–5 not in same plane as 1–2, ventrite 1 weakly concave, with scattered scales, ventrite 2 as long as 3–4, feebly concave, completely squamous, ventrite 5 as long as ventrite 5, convex at middle, with an anterior impression. Femora armed, hind femur reaching elytral apex, middle and hind tibiae subparallel, premucro absent. Male genitalia ( Figure 125 ) with median lobe in lateral view weakly curved, very slender; in ventral view as long as apodemes, lateral sides convex beyond 0.27 length from base, convergent, apex acute; apical process in lateral view moderately large (0.26–0.34 as long as median lobe body), sinuate, moderately curved downward; in ventral view constricted beyond median orifice, lateral sides convergent. Female with sternite eight doliform, apex not constricted, median membranous area as long as the basal plate, ramus short, slender, nodulus slender.

Geographic distribution. México (Chiapas).

Habitat and elevation. Specimens were collected from leaf litter in high elevation cloud forest between 2400–2760 m.

Derivation of specific name. Name derived from the Latin word immudus = dirty, filthy, slovenly.

Material examined. Total 7 males, 12 females. Holotype male: ( CMNC): México: Chiapas, San Cristóbal de las Casas Cerro Huitepec , ca. 5 km W San Cristóbal, elev. 2650 m (92° 41'38.4"W, 16° 44'33"N), 17.ix.1991. R . Anderson, 91–106. Paratypes: México: Chiapas, San Cristóbal de las Casas, Cerro Huitepec (pico) 5 km W San Cristóbal, elev. 2750 m (16°44'33''N, 92°41'38.4''W), 15.ix.1991, coll. R . S. Anderson — 1 males 1 female ( CMNC); same locality, 18.ix.1991, coll. R . S. Anderson — 1 male ( CMNC); Cerro Huitepec ca. 5 km W San Cristóbal, elev. 2760 m (16°44'33''N, 92°41'38.4''W), 14.ix.1992, coll. R . S. Anderson — 1 male, 2 females ( CMNC); same locality, elev. 2650 m, 17.ix.1991, coll. R . S. Anderson — 2 males, 8 females ( BMNH, CMNC, CWOB, ECOS); same locality, 14–25.ix.1992 — 1 female ( CMNC); Reserva Huitepec , elev. 2400 m (16°44'47.76''N, 16°45'0''E), 11.viii.2007, coll. R . S. Anderson — 1 male ( CMNC) .

Figures

FIGURES 84–91. Dorsal and lateral habitus: 84–85. Tylodinus pappi, 86–87. Tylodinus branstetteri, 88–89. Tylodinus immundus, 90–91. Tylodinus intzin.

FIGURES 120–129. Ventral and lateral habitus of median lobe: 120. Tylodinus dominicus, 121. Tylodinus noctis, 122. Tylodinus kuscheli, 123. Tylodinus pappi, 124. Tylodinus branstetteri, 125. Tylodinus immundus, 126. Tylodinus intzin, 127. Tylodinus gibbosus, 128. Tylodinus kissingeri, 129. Tylodinus pinguis.

FIGURES 130–131. Map showing collecting sites. 130. Occurrences in México (Chiapas) and Central America of: Tylodinus zilchi (El Salvador, Honduras); Tylodinus andersoni (México), Tylodinus canaliculatus (México, Guatemala), Tylodinus triumforium (México), Tylodinus sepulturaensis (México), Tylodinus cavicrus (Guatemala), Tylodinus pseudocavicrus (México); 131. Occurrences in Chiapas, México of: Tylodinus complicatus, Tylodinus ixchel, Tylodinus dominicus, Tylodinus immundus, Tylodinus porvenirensis, Tylodinus branstetteri.

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.