Tylodinus elongatus 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 : 43

24. Tylodinus elongatus Luna-Cozar , sp. nov.

( Figures 5 , 19 , 22 , 72-73 , 98a , 117 , 132 )

Diagnosis. Length male, 10.0- 10.1 mm, female, 10.0 mm. Width male, 3.4-3.5 mm, female 3.5 mm. Body approximately 2.7x longer than wide, black. Head with dark brown scales; vertex with patch of yellow scales on middle, scales overlapping; frons moderately concave; rostrum moderately robust, moderately carinate, apical area puncticulate; eyes 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 middle; disc a 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 thick longitudinal fringe along middle and narrow strip that diverges from middle base to flanks, and with dark scales on middle and posterior areas of disc ( Figure 14 ); surface without granules. Elytra with basal margin strongly sinuate ( Figure 5 ), surface with shallow punctures, small and sparse; intervals more convex as follows: I3 at declivity near the apex, I7 at middle of elytra near the tubercle in this interval, I8 at middle of elytra and I9 at apical 2/3; tubercle distribution as follows: tubercle on I 2 in front of the declivity, I3 with two tubercles, first tubercle sub basal and second tubercle on middle of elytra, I4 with tubercle at base of elytra, smaller than tubercle on I2, I5 with two tubercles in same position as tubercles on I3 but smaller in size, I6 with swelling on declivity, I7 with callous on humerus and subbasal tubercle, I9 with subbasal swelling. Metasternum moderately concave, median section glabrous, metasternal tooth present ( Figure 19 ). Abdomen very large, longer than length from head to metasternum on anterior area, male with ventrite 1 moderately concave, glabrous in median section; ventrite 2 as long as 3-4 combined, convex, glabrous in median section; ventrite 5 longer than 1, convex in middle area, almost glabrous, scales dense on ventrite 5, female with two acute projections at apex ( Figure 22 ). Legs very elongate, clothed with dark brown scales, light brown on apical 1/3 on dorsal area and along inside of femora, with patch of light brown to yellow scales on femoral tooth, hind femur almost reaching elytral apex, front tibia subparallel, excavated on apical ½ on internal margin, middle and hind tibiae subparallel, internal margin slightly sinuate, premucro absent. Male genitalia ( Figure 98a , 117 ) with median lobe in lateral view weakly curved, very slender; in ventral view longer than apodemes, lateral sides straight, convergent, apex blunt; apical process in lateral view moderately large (0.26-0.34 as long as median lobe), moderately curved downward and then abruptly curved upward ( Figure 117 ); in ventral view constricted beyond median orifice, lateral sides subparallel Female genitalia with tergite eight trapezoidal, apex slightly curved, apical margin smooth; sternite eight doliform, with apex not constricted, length of median membranous area 1/3 as long as basal plate, spermatheca very shallowly curved, outer margin of the corpus convex, ramus and nodulus indistinct.

Comments. This species resembles members of the T. spiniventris species group but is distinguished by having a very elongate body, abdomen longer than the length from head to metasternum.

Geographic distribution. México (Chiapas).

Habitat and elevation. The three specimens of this odd species were collected on dead tree limbs at night; they were observed to run rapidly along the branches. The habitat was a high elevation cloud forest between 2000- 2100 m.

Derivation of specific name. Name derived from the Latin word elongates = prolong, protract.

Material examined. Total 2 males, 1 female. Holotype male ( CMNC): México: Chiapas, Ángel Albino Corzo, Reserva El Triunfo, Polígono 1, elev. 2050 m (15°39'25.56''N, 92°48'32.4''W), 16-21.xi.2002, coll. R . S. Anderson. Paratype: México: Chiapas, Ángel Albino Corzo , El Triunfo Polygono #1, elev. 2100 m (15°39.33'N, 92°48.44'W), 18.xi.2001, coll. R . Jones — 1 female ( UAQM); Reserva El Triunfo, Polígono 1, elev. 2050 m (15°39'25.56''N, 92°48'32.4''W), 16-21.xi.2002, coll. R . S. Anderson — 1 male ( CMNC) .

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 20–27. 20–21. Tylodinus spiniventris: 20. meso- and metathorax (male) 21. ventrite 5 (female), 22. Tylodinus elongatus ventrite 5 (female), 23. Tylodinus triumforium, ventrite 2 (male). 24. Tylodinus complicatus, ventrite 2 (female). 25. Tylodinus complicatus, ventrite 2 (male), 26. Hind tibia of Tylodinus triumforium, 27. Front tibia of Tylodinus rugosus.

FIGURES 68–75. Dorsal and lateral habitus: 68–69. Tylodinus pusillus, 70–71. Tylodinus porvenirensis, 72–73. Tylodinus elongatus, 74–75. Tylodinus complicatus.

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 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.

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.