Tychius (s. str.) parallelus (Panzer, 1794)

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 : 7

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

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Tychius (s. str.) parallelus (Panzer, 1794)


Tychius (s. str.) parallelus (Panzer, 1794) View in CoL

Caldara 1990: 85.

Material examined. 2 larvae from pods of Cytisus scoparius (L.) Link., collected 14.viii.1989 at Navacerrada , Sierra de Guadarrama, Madrid ( Spain), 1500 m, leg. A.J. Velázquez de Castro, determined by association with adults collected on the same plant .

Differential diagnosis. See Table.2 View TABLE 2 .

Description of mature larva. COLORATION. Head brown to dark yellow. All thoracic and abdominal segments light yellow.

HEAD CAPSULE AND MOUTH PARTS. Head width: 0.45–0.51 mm (see Table. 1 View TABLE 1 ). Endocarinal line present, reaching middle of frons. Des 1 located almost in central parts of epicranium; des 2 absent; des 3 located along frontal suture; des 4 absent; des 5 located laterally ( Fig. 1 View FIGURES 1–6 ). Fs 1 and fs 2 absent; fs 3 very short, located medially; fs 4 located anteromedially (along epistoma); fs 5 located anterolaterally (along epistoma), 3 to 4 times longer than fs 3 ( Fig. 1 View FIGURES 1–6 ). Both les almost as long as des 3; ves very short. Postepicranial area with 1 minute pes. Antennal segment membranous, bearing conical sensorium and 2 very short, conical, sensilla ( Fig. 4 View FIGURES 1–6 ).

Labrum ( Fig. 5 View FIGURES 1–6 ) approximately 2.5 times as wide as long; lms 1 slightly longer than lms 3, lms 2 distinctly longer than lms 1; anterior margin slightly sinuate. Clypeus ( Fig. 5 View FIGURES 1–6 ) 3.5 times as wide as long; with 2 pairs of short cls of same length, located posterolaterally; anterior margin slightly rounded inside. Epipharynx ( Fig. 6 View FIGURES 1–6 ) with 3 pairs of als, different in length; with 2 pairs of short ams, ams 2 distinctly shorter than ams 1; with 3 relatively short and finger-like mes; labral rods short, kidney-shaped, strongly converging posteriorly. Mandibles ( Fig. 3 View FIGURES 1–6 ) with 2 short mds, different in length. Maxilla ( Fig. 2 View FIGURES 1–6 ): stipes with 1 stps, and with 2 pfs of equal length; mala with 5 slightly curved dms, different in length; with 4 vms, moderately long and almost of equal length. Maxillary palpi: length ratio of basal and distal palpomeres 1:1.4; basal palpomera with 1 short mxps; distal palpomera with group of 3–4 conical, cuticular apical processes. Prementum ( Fig. 2 View FIGURES 1–6 ) almost rounded, with 1 prms; margin of ligula slightly curved inside; ligula with 2 lig; premental sclerite distinct. Postmentum ( Fig. 2 View FIGURES 1–6 ) with 3 pairs of pms different in length.

THORAX AND ABDOMEN. Body length 3.9–4.9 mm (see Table. 1 View TABLE 1 ), elongate. Abdominal segments I–VI almost equal in length ( Fig. 7 View FIGURES 7–10 ). Spiracles on abdomen in anteromedian parts of segments (abdominal segments I–VIII).

Chaetotaxy of body rather reduced. Setae moderately short or very short, and light yellow. Thorax. Prothorax ( Fig. 8 View FIGURES 7–10 ) with 8 prn, 7 macro- and 1 microsetae; 2 moderately long ps of same length; 1 eus. Meso- and metathorax ( Fig. 8 View FIGURES 7–10 ) with 1 prs; 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 5 pda, different in length (long, moderately long, short). Abdomen. Abdominal segments I–VII ( Fig. 9 View FIGURES 7–10 ) with 1 prs; 3 pds of different length; 1 ss; 2 eps of different length; 1 ps; and 2 short eus. Abdominal segment VIII ( Fig. 10 View FIGURES 7–10 ) with 1 prs; 3 pds; 1 ss; 1 ps; and 2 short eus. Abdominal segment IX ( Fig. 10 View FIGURES 7–10 ) with 1 ds; and 1 sts. Anal lobes on abdominal segment X ( Fig. 10 View FIGURES 7–10 ) without setae.

Biological observations. Larvae emerged in laboratory from pods collected a few days before (A.J. Velázquez de Castro, pers. comm.). No other information is available.

Remarks. Tychius parallelus lives on different species of Cytisus in central and southern Europe and in Algeria. Biological information on adults are reported by Caldara & Velázquez de Castro (1991).













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