Tychius (s. str.) caldarai Dieckmann, 1986

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 : 16

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

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Tychius (s. str.) caldarai Dieckmann, 1986


Tychius (s. str.) caldarai Dieckmann, 1986 View in CoL

Caldara, 1990: 168.

Material examined. 9 larvae obtained from pods of Dorycnium pentaphyllum Scop. collected 15.vi.1992 at Parodi Ligure , Alessandria province, Piemonte (northern Italy), leg. R. Caldara, and 7 pupae obtained from larvae collected contemporaneously together with 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 to dark yellow. All thoracic and abdominal segments light yellow.

HEAD CAPSULE AND MOUTH PARTS. Head width: 0.36–0.40 mm (see Table. 1 View TABLE 1 ). Endocarinal line present, exceeding middle of frons. Des 1, des 2, des 3 and des 4 located very near frontal suture; des 5 located laterally; des 2 and des 4 4 times shorter than others (des 1, des 3, des 5) ( Fig. 99 View FIGURES 99–104 ). Fs 1–3 absent; fs 4 located anteromedially (along epistoma); fs 5 located anterolaterally (along epistoma) ( Fig. 99 View FIGURES 99–104 ). Les almost equal in length 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. 102 View FIGURES 99–104 ).

Labrum ( Fig. 103 View FIGURES 99–104 ) approximately 3 times as wide as long; lms 1 slightly longer than lms 3, lms 2 almost of same length as lms 1; anterior margin slightly curved inside. Clypeus ( Fig. 103 View FIGURES 99–104 ) 3.5 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. Epipharynx ( Fig. 104 View FIGURES 99–104 ) with 2 pairs of als, almost of equal length; with 2 pairs of short ams, ams 1 distinctly shorter than ams 2; with 2 long finger-like and 1 short mes; labral rods short, kidney-shaped, strongly converging posteriorly. Mandibles ( Fig. 101 View FIGURES 99–104 ) with 2 short mds. Maxilla ( Fig. 100 View FIGURES 99–104 ): stipes with 1 stps, and 2 pfs of equal length; mala with 4 straight dms, different in length; with 3 vms, short and almost of equal length. Maxillary palpi: length ratio of basal and distal palpomeres 1:1.3; basal palpomera with 1 short mpxs; distal palpomera with group of 3–4 conical, cuticular apical processes. Prementum ( Fig. 100 View FIGURES 99–104 ) almost rounded, with 1 prms; margin of ligula slightly curved inside; ligula with 3 lig; premental sclerite distinct. Postmentum ( Fig. 100 View FIGURES 99–104 ) with 3 pairs of pms, different in length.

THORAX AND ABDOMEN. Body length 1.9–2.3 mm (see Table. 1 View TABLE 1 ), elongate. Spiracles on abdomen in anteromedian parts of segments (abdominal seg. I–VIII).

Chaetotaxy of body reduced. Setae moderately short or very short and light yellow. Thorax. Prothorax ( Fig. 106 View FIGURES 105–108 ) with 8 prn, 6 macro- and 2 microsetae; 2 moderately long ps of same length; 1 eus. Meso- and metathorax ( Fig. 106 View FIGURES 105–108 ) 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 3 pda, different in length (long, moderately long, short). Abdomen. Abdominal segments I–VII ( Fig. 107 View FIGURES 105–108 ) with 1 prs; 1 pds; 1 ss; 1 eps; 1 ps; and 2 short eus. Abdominal segment VIII ( Fig. 108 View FIGURES 105–108 ) with 1 pds; 1 eps; 1 ps; and 2 short eus. Abdominal segment IX ( Fig. 108 View FIGURES 105–108 ) with 1 ds; 1 ps; and 1 sts. Anal lobes on abdominal segment X ( Fig. 108 View FIGURES 105–108 ) with 1 very short, feebly visible seta.

Description of pupa. COLORATION. Body whitish yellow.

MORPHOLOGY ( Figs. 109–111 View FIGURES 109–111 ). Body length 2.6–2.8 mm; widest part 0.9–1.1 mm (see Table. 1 View TABLE 1 ). Body elongate. Rostrum long, approximately 6 times as long as wide, reaching mesocoxae. Pronotum 1.5 times as wide as long.

CHAETOTAXY ( Figs. 109–111 View FIGURES 109–111 ). Setae distinct, moderately long, unequal in length, light brown; on pronotum and head placed on small 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 with 1 fes. Setae on abdominal segments I–VIII placed medially and laterally; all abdominal setae located on small, conical protuberances. Pseudocerci slender, slightly curved inside.

Biological observations. Pupae were found in their cells after 8 days from the introduction of larvae into the soil. The pupal stage lasted 10 days. Adults were observed first in pupal cells after another 12 days. No adult left its cell during the following 30 days, and then they were removed artificially.

Remarks. This species is monophagous on Dorycnium pentaphyllum and known from south-western Europe. It is very similar to and vicariant with T. cinnamomeus Kiesenwetter, 1852 from southern Spain, southern France and northwestern Italy living on the same plant.


Departamento de Geologia, Universidad de Chile













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