Tylodinus cavicrus, Champion, 1905

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 : 18

publication ID

https://doi.org/ 10.11646/zootaxa.3788.1

publication LSID

lsid:zoobank.org:pub:7484832A-025B-41FA-9696-DF7531C01AA4

DOI

https://doi.org/10.5281/zenodo.5080212

persistent identifier

https://treatment.plazi.org/id/C27E87FF-FF8A-611D-FF14-DBAA21A3F93C

treatment provided by

Felipe

scientific name

Tylodinus cavicrus
status

 

Tylodinus cavicrus View in CoL species group

Recognition. This species group is distinguished by the shape of the front and middle tibiae, which are bowed inwards at the apex, acutely dentate on the inner side beyond the middle, the space between this and the tip being very deeply excavate ( Figure 27 View FIGURES 20–27. 20–21 ); this form of the legs is more distinct in males than in females.

Diagnosis. Body 2.0–2.3x longer than wide, black, head and rostrum reddish in some specimens. Head with dark brown scales; with patch of overlapping scales on middle of vertex, whitish, yellow or light brown; frons moderately concave or concave (one species); rostrum moderately robust, rugulate (one species), moderately convex, punctures small and deep, moderately dense, size similar to punctures on head, apical area puncticulate; eyes moderately convex. Pronotum in lateral view moderately or strongly convex (one species), outline with anterior and posterior constriction, these constrictions moderately to strongly depressed ( Figure 11 View FIGURES 1–11. 1–5 ); in dorsal view with sides slightly divergent from base to midlength, then convergent to apex, constricted beyond the middle ( Figures 14 View FIGURES 12–19. 12 ), with longitudinal and moderately deep impression; surface granulate, moderately carinate and/or rugose (one species); punctures contiguous or dense on lateral sides, progressively more spaced, smaller and shallower to the median section, and less conspicuous to the anterior and posterior section ( Figure 15 View FIGURES 12–19. 12 ); with yellow or light brown scales very dense on lateral sides and flanks, anterior area forming a thick longitudinal fringe along the middle and a narrow strip that diverges from the middle base to the flanks, and with dark brown scales on the middle and posterior areas of the disc. Elytra black; with basal margin moderately to slightly sinuate (one species) ( Figures 3–4 View FIGURES 1–11. 1–5 ); surface granulate, denser on tubercles; striae 10 complete; elytral scales sparse to moderately dense, dense at base and half of the disc, becoming more separated towards flanks, very dense at intervals of 1–2 of the elytral declivity; tubercles in I2 on declivity smaller than tubercle in I 4 in same position or same size (one species). Metasternum with median section concave, smooth and glabrous; metasternal tooth present or absent (one species). Male abdomen with ventrites 1–2 not in the same plane as ventrites 2–5; ventrite 1 concave or moderately concave (one species), median section posteriorly smooth and glabrous; ventrite 2 longer than ventrites 3–4 combined, slightly concave, with two transverse lines of scales interrupted medially ( Figure 23 View FIGURES 20–27. 20–21 ); ventrite 5 as large as ventrite 1, convex or flat in middle (one species), with an impression at anterior middle. Legs with dense scales, femora armed, hind femur almost reaching the elytral apex, front and middle tibiae (especially of male) bent inwards apically, sharply toothed on inner margin beyond middle, the space between tooth and apex deeply excavate ( Figure 27 View FIGURES 20–27. 20–21 ); hind tibia with outer margin straight or with external tooth, premucro absent. Male genitalia ( Figures 101–103 View FIGURES 100–109 ) with median lobe in lateral view stout (one species) or moderately stout, weakly curved; in ventral view as long as half-length of apodemes (one species) or equal to apodeme length, lateral sides straight, subparallel, apex truncate or blunt ( Figures 98c View FIGURES 92–99. 92–99 , 103 View FIGURES 100–109 ); apical process in lateral view weakly curved, not curved downward, in ventral view constricted beyond the median orifice, sides subparallel; tergite eight longer than width; sternite eight elongate. Female genitalia with the apex of the tergite eight straight, trapezoidal, the margin of apex smooth and slightly curved; spermatheca very shallowly curved, outer margin not convex to slightly convex, ramus slender and short, nodulus slender.

Key to species of Tylodinus cavicrus View in CoL species group

1 Tubercle on interval 2 of elytral declivity with a distinct patch of yellow to light brown scales ( Figures 38–39 View FIGURES 36–43 ); hind tibia with an external tooth ( Figure 26 View FIGURES 20–27. 20–21 )............................................................ T. rugosus Luna-Cozar

- Elytra without patches of scales on tubercles on declivity; hind tibia without an external tooth......................... 2

2(1) Elytral declivity with the tubercle on interval 4 distinctly larger than the tubercle on interval 2 ( Figures 34–35 View FIGURES 28–35 )............................................................................................... T. cavicrus Champion View in CoL

- Elytral declivity with the tubercle on interval 4 slightly larger than the tubercle on interval 2 ( Figures 36–37 View FIGURES 36–43 )........................................................................................... T. pseudocavicrus Luna-Cozar

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Curculionidae

Genus

Tylodinus

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