Temnocerus yucatensis, Hamilton, 2010

Hamilton, R. W., 2010, Central American Temnocerus Thunberg, 1815 (Coleoptera: Rhynchitidae), Insecta Mundi 2010 (128), pp. 1-42 : 40-41

Temnocerus yucatensis , new species

( Fig. 57, 58 , 86 , 94 )

Type locality. Mexico, Yucatan, 10 km SW Merida

Type depository. Charles W. O’Brien collection ( CWOB)

Type specimens. Holotype male (dissected) with the following data: Mexico, Yuc., 10 km SW Merida , vii-30-1990, CW & LB O’Brien . Allotype with same data as holotype except 10 km E Merida , viii-1-1990 ( CWOB) . Paratypes as follows: 1 female, Yucatan, 2.1 mi. E Chichen Itza, 100’ Dry trop. Seas. For., 19- 20-vii-83, R. Anderson / W. Maddison ; 1 female, Yucatan, Uxmal Ruins , 50 m, 21-vii-1983, roadside sweep, R. S. Anderson ( CMNC). 1 female, Yuc., 3 mi E Chichen Itza, Aug. 6, 1974, CW & L O’Brien & Marshall ( CWOB) .

Description. Color and pubescence: Body black with a faint brassy luster to pronotum and a faint bluish luster to the elytra. Pubescence composed of very short inconspicuous reclinate brownish setae. Size: Male (n = 1) 1.8 × 0.8 mm; Female (n= 4) 1.6 × 0.6 mm to 1.7 × 0.7 mm. Head quadrate, as long as wide, moderately punctured, punctures coarse, round, moderately impressed; interspaces minutely granulose; eyes large, oval, strongly protuberant. Rostrum short, slightly longer than head, gradually widened beyond antennal insertions, moderately to densely punctured, slightly arcuate, slightly flattened apically, with basi-dorsal median channel extending from rostral base to middle of rostrum; channel minutely granulose. Antenna distinctly longer than rostrum, inserted near basal 1/3 of rostrum; scape and funicular segment 1 ovoglobose, subequal in length; funicular segment 1 more robust; funicular segments 2-4 narrow, oval; 3 and 4 subequal; segment 2 slightly longer than 3 or 4; segments 5-7 short bead-like, 6 and 7 slightly more robust than 5; club abrupt; basal and middle segment subequal in length; basal segment narrowed at base; middle segment rectangular, wider than long; terminal segment slightly longer than basal or middle segment, bluntly acuminate. Pronotum as wide as long, widest just behind middle, densely punctured; interspaces minutely granulose. Scutellum subquadrate, about as long as wide, minutely granulose. Elytra about as long as pronotum, widest near apical 1/3; humeri simple; striae moderately impressed becoming slightly smaller beyond middle; intervals weakly raised, with single row of setigerous punctures; strial interspaces with single setigerous puncture. Thoracic pleura and sterna with moderate to dense coarse setigerous punctures. Abdominal ventrites with sparse small punctures; lateral interspaces minutely granulate.

Distribution. All specimens of the type material were collected in the Mexican state of Yucatan ( Fig. 94 ).

Etymology. The specific epithet is derived from the Mexican state of Yucatan.

Comments. The adults of this species are very similar to T. chiapensis and T. herediensis but can be distinguished by the narrowly pointed aedeagal pedon. The aedeagus ( Fig. 86 ) has a short and basally wide median lobe that narrows abruptly to a pointed pedon apex. The tectum is spatulate. The tegminal cap piece is finger-like with subparallel sides and a small pigmented apex bearing a cluster of very small setae. Endophallic bands are short, linear and weakly defined.

Plant association. Unknown.

Figures

Figure 47-58. Heads of Temnocerus species, frontal view, male left and female right. 47-48) T. rostralis n.sp., holotype and allotype. 49-50) T. rugosus n.sp., holotype and allotype. 51-52) T. salvensis n.sp., holotype and allotype; 53-54) T. tamaulipensis n.sp., holotype and allotype. 55-56) T. thesaurus (Sharp). 57-58) T. yucatensis n.sp., holotype and allotype.

Figure 59-86. Aedeagal tegmen and median lobe of Temnocerus species, dorsal view, 64X. 59) T. abdominalis (Voss). 60) T. chiapensis n. sp. 61) T. chiriquensis (Sharp). 62) T. confertus (Sharp). 63) T. cyaneus n. sp. 64) T. ellus n. sp. 65) T. giganteus n. sp.; 66) T. guatemalenus (Sharp). 67) T. guerrerensis n. sp. 68) T. herediensis n. sp. 69) T. mexicanus n. sp. 70) T. michoacensis n. sp. 71) T. minutus n. sp. 72) T. niger n. sp. 73) T. oaxacensis n. sp. 74) T. obrieni n. sp. 75) T. oculatus (Sharp). 76) T. potosi n. sp. 77) T. pseudaeratus n. sp. 78) T. pueblensis n. sp. 79) T. pusillus (Sharp). 80) T. regularis (Sharp). 81) T. rostralis n. sp. 82) T. rugosus n. sp. 83) T. salvensis n. sp. 84) T. tamaulipensis n. sp. 85) T. thesaurus (Sharp) 86) T. yucatensis n. sp.

Figure 91-94. Distribution of Temnocerus species. 91) T. rugosus, red; T. obrieni, black; T. oaxacensis, blue; T. niger, green. 92) T. pseudaeratus, black; T. potosi, blue; T. cyaneus, green; T. oculatus, red. 93) T. pueblensis, red; T. pusillus, blue; T. regularis, black; T. salvensis, green. 94) T. tamaulipensis, red; T. thesaurus, blue; T. yucatensis, black.