Tychius (s. str.) schneideri (Herbst, 1795)

Skuhrovec, Jiří, Gosik, Rafał & Caldara, Roberto, 2014, Immatures of Palaearctic species of the weevil genus Tychius (Coleoptera, Curculionidae): new descriptions and new bionomic data with an evaluation of their value in a phylogenetic reconstruction of the genus, Zootaxa 3839 (1), pp. 1-83 : 13-14

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https://doi.org/ 10.11646/zootaxa.3839.1.1

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Tychius (s. str.) schneideri (Herbst, 1795)


Tychius (s. str.) schneideri (Herbst, 1795) View in CoL

Caldara, 1990: 158.

Material examined. 13 larvae from pods of Anthyllis vulneraria polyphilla (DC.) Nyman collected 25.vi.1981 at Bobbio , Piacenza province , Emilia (northern Italy), leg. R. Caldara, and 14 pupae obtained from larvae collected similarly to the others, all determined by association with reared adults.

Differential diagnosis. See Tables 2 View TABLE 2 and 3 View TABLE 3 .

Description of mature larva. COLORATION. Head brown. All thoracic and abdominal segments white to whitish yellow.

HEAD CAPSULE AND MOUTH PARTS. Head width: 0.40–0.46 mm (see Table. 1 View TABLE 1 ). Endocarinal line present, reaching middle of frons. Des 1 located almost in central parts of epicarnium; des 2 located very near frontal suture, near des 3; des 3 located along frontal suture; des 4 absent; des 5 located anterolaterally; des 2 4 times shorter than others (des 1, des 3, des 5) ( Fig. 73 View FIGURES 73–78 ). Fs 1 and fs 2 absent; fs 3 short, located posteromedially; fs 4 located anteromedially (along epistoma); fs 5 located anterolaterally (along epistoma), 3 to 4 times longer than fs 3 ( Fig. 73 View FIGURES 73–78 ). Les distinctly shorter than des 3. Ves 1–2 very short. Post-epicranial area with 1 minute pes. Antennal segment membranous, bearing conical sensorium and 5 very short, conical, sensilla ( Fig. 76 View FIGURES 73–78 ).

Labrum ( Fig. 77 View FIGURES 73–78 ) approximately 3 times as wide as long; lms 1 2 times longer than lms 3, lms 2 some shorter than lms 1; anterior margin rounded. Clypeus ( Fig. 77 View FIGURES 73–78 ) 2.4 times as wide as long. with 2 pairs of very short cls of same length, and 1 sensillum, all located posterolaterally; anterior margin slightly rounded inside. Epipharynx ( Fig. 78 View FIGURES 73–78 ) with 2 pairs of als, different in length; with 2 pairs of short and triangular ams; with 2 moderately long finger-like and 1 short mes; labral rods short, kidney-shaped, almost parallel. Mandibles ( Fig. 75 View FIGURES 73–78 ) with 2 short mds, almost of equal length. Maxilla ( Fig. 74 View FIGURES 73–78 ): stipes with 1 stps, and with 2 pfs of different length; with 4 slightly curved dms, different in length; with 2 vms, short and almost of equal length. Maxillary palpi: length ratio of basal and distal palpomeres 1:0.7; basal palpomera with 1 short mpxs; distal palpomera with group of 2–3 conical, cuticular apical processes. Prementum ( Fig. 74 View FIGURES 73–78 ) heart-shaped, with 1 prms; margin of ligula rounded; ligula with 1 lig; premental sclerite distinct. Postmentum ( Fig. 74 View FIGURES 73–78 ) with 3 pairs of pms, different in length.

THORAX AND ABDOMEN. Body length 2.3–3.2 mm (see Table. 1 View TABLE 1 ), elongate ( Fig. 79 View FIGURES 79–82 ). Abdominal segments I–V almost equal in length, slightly larger than abdominal segment VI and VII ( Fig. 79 View FIGURES 79–82 ). Spiracles on abdomen in median parts of segments (abdominal seg. I–VIII).

Chaetotaxy of body rather reduced. Setae moderately long or short and light yellow. Thorax. Prothorax ( Fig. 80 View FIGURES 79–82 ) with 8 prn, 7 macro- and 1 microsetae; 2 moderately long ps of same length; 1 eus. Meso- and metathorax ( Fig. 80 View FIGURES 79–82 ) with 2 prs, different in length; 3 pds, different in length; alar area with 1 very short as; 1 very short ss; 1 eps; 1 ps; and 1 short eus. Each pedal area of thoracic segments well-separated and with 2 pda. Abdomen. Abdominal segments I–VII ( Fig. 81 View FIGURES 79–82 ) with 1 prs; 3 pds of different length; 2 ss of different length; 1 eps; 2 ps of different length; 1 lsts; and 2 eus. Abdominal segment VIII ( Fig. 82 View FIGURES 79–82 ) with 2 pds of different length; 2 ss of different length; 1 eps; 2 ps of different length; 1 lsts; and 2 moderately long eus. Abdominal segment IX ( Fig. 82 View FIGURES 79–82 ) with 2 ds of different length; 1 ps; and 1 sts. Anal lobes on abdominal segment X ( Fig. 82 View FIGURES 79–82 ) with 2 very short, feebly visible setae.

Description of pupa. COLORATION. Body whitish yellow.

MORPHOLOGY ( Figs. 83–85 View FIGURES 83–85 ). Body length 2.0– 2.7 mm; widest part 1.2–1.5 mm (see Table. 1 View TABLE 1 ). Body elongate. Rostrum long, approximately 4.5 times as long as wide, reaching mesocoxae. Pronotum 1.9 times as wide as long.

CHAETOTAXY ( Figs. 83–85 View FIGURES 83–85 ). Setae distinct, moderately long, unequal in length, light brown; on pronotum and head placed on conical protuberances. Head capsule including 1 vs, 1 os, and 1 pas. Rostrum with 1 rs located medially. Vs and os as long as setae on pronotum, distinctly longer than pas and rs. Pronotum with 2 as, 2 ls, 2 ds, and 1 pls; ds as long as other setae on pronotum. Dorsal parts of meso- and metathorax with 1 seta. Each apex of femora without seta. Setae on abdominal segments I–VIII placed posteromedially and posterolaterally; all abdominal setae located on small, conical protuberances. Pseudocerci short, slightly curved inside.

Biological observations. Pupation was observed 15 days after the introduction of the larvae in the soil. The duration of the pupal stage was about 12 days. Adults began to emerge from the cells 7 days later.

Remarks. Tychius schneideri is monophagous on Anthyllis vulneraria L. s. l. and is widely distributed in Europe. The larva was described, although incompletely, by Karasyov (1991) on specimens collected at Minsk ( Bielorussia).


Departamento de Geologia, Universidad de Chile













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