Rafał Gosik, Peter Sprick, Jiří Skuhrovec, Magdalena Deruś & Martin Hommes, 2016, Morphology and identification of the mature larvae of several species of the genus Otiorhynchus (Coleoptera, Curculionidae, Entiminae) from Central Europe with an update of the life history tr, Zootaxa 4108 (1), pp. 1-67: 36-37

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Otiorhynchus  (s. str.) tenebricosus (Herbst, 1784)  complex: Otiorhynchus fuscipes (Olivier, 1807) 

Material examined: 4 larvae ( Fig. 214View FIGURES 211 – 219). Ith Mountains, southwest of Hannover, in the district of Hameln, Niedersachsen, 350–400 m, 13.10 .2011, 2 ex.; dto., 0 1.09 .2012, 1 ex.; dto., 26.03 .2012, 1 ex.

Remarks about sampling and development. All larvae were received from field-sampling in a beech forest on limestone, at about 350–400 m above sea level in the submontane climate zone. The larvae were found between the roots of young Fraxinus excelsior  L. plants, growing intermixed with Allium ursinum  L., which can be recognized by their characteristic subterranean overwintering organs, the longitudinal bulbs. As we know there are no data on the life-cycle of this taxon including larval development.

Description ( Figs. 100–110View FIGURES 100 – 105View FIGURES 106 – 110).

Coloration. Head dark brown; all thoracic and abdominal segments from dark yellow to brownish; cuticle almost smooth.

Body moderately elongated ( Fig. 100View FIGURES 100 – 105). Chaetotaxy: Setae different in length, relatively long, filiform, brownish. Thorax. Prothorax with 4 long and 5 medium long to short prns; and 2 ps, different in length. Mesothorax with 1 medium long prs; 4 pds (ordered: 2 short and 2 long); 1 long and 1 very short as; 1 long eps; and 1 long ps. Chaetotaxy of meso- and metathorax similar. Each pedal area of thoracic segments well isolated, with 5 pda, different in length. Each thoracic segment with 1 short eus ( Fig. 101View FIGURES 100 – 105). Abdomen. Abdominal segments I –VIII with 1 short prs; 5 pds (ordered: 2 short, 1 long, 1 short and 1 long); 1 long and 1 very short sps [abd. seg. VIII only with 1 very short sps]; 2 eps almost equal in length; 1 long and 1 short ps; 1 long lsts; and 2 eus ( Figs. 102, 104, 105View FIGURES 100 – 105). Abdominal segment IX with 3 ds, different in length; 1 long and 1 very short ps; and 2 sts, equal in length ( Figs. 103–105View FIGURES 100 – 105). Lateral lobes of abdominal segment X with 2–3 minute ts each.

Head subglobose (slightly narrowed) ( Fig. 106View FIGURES 106 – 110). Head capsule with 4 long des, des 1 and des 2 placed on central part of epicranium, des 3 located on frontal suture, des 5 located anterolaterally; 2 long fs, fs 4 placed anteromedially, fs 5 located near to antenna; 2 long les; and 1 very short ves. Postepicranial area with a group of 5 pairs of sensilla, frons with 2 pairs of sensilla. Stemmata (2 pairs) feebly visible. Antennal segment membranous, bearing 1 conical sensorium and 3–4 filiform sensilla. Clypeus 2.1 times as wide as long with 2 cls, equal in length, placed posterolaterally ( Fig. 107View FIGURES 106 – 110). Labrum about 1.6 times as wide as long with 3 straight lms of different length, placed medially or mediolaterally; lms 1 shorter than other setae, all lms exceeding the outline of the labrum; the anterior margin of labrum almost rounded ( Fig. 107View FIGURES 106 – 110). Epipharynx with 3 finger-like als, different in length; 2 ams, different in length; and 2 very short mes; labral rods (lr) short, reniform, strong convergent ( Fig. 108View FIGURES 106 – 110). Mandible ( Fig. 109View FIGURES 106 – 110) bifid, teeth almost of equal height; with 1 short and 1 long mds; internal edge with a triangular tooth. Maxilla ( Fig. 110View FIGURES 106 – 110) with 1 very long stps and 2 very long pfs, placed ventrolaterally; 1 very short mbs, situated ventrally. Mala with 7 dms, different in length and 4 straight vms, different in length. Maxillary palpi with two palpomeres of almost equal length; basal palpomere with 1 mxps; distal palpomere with a group of 6 conical, cuticular processes apically; each palpomere with a sensillum. Praelabium heart-shaped ( Fig. 110View FIGURES 106 – 110), with 2 very short ligs and 1 long prms. Labial palpi with two palpomeres, relatively elongated; both palpomeres almost equal in length; praemental sclerite wide, well visible. Postlabium with 3 pms, different in length; pms 2 very long, 2 times as long as pms 1 and 3 times as long as pms 3 ( Fig. 110View FIGURES 106 – 110).

Differential diagnosis. See “Key to larvae of selected Otiorhynchus  species” and Tables 1, 2.