Otiorhynchus (Zustalestus) rugosostriatus (Goeze, 1777)

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: 48-53

publication ID

http://doi.org/10.11646/zootaxa.4108.1.1

publication LSID

lsid:zoobank.org:pub:B802F2B1-944E-4B84-A856-8091E60D88FC

persistent identifier

http://treatment.plazi.org/id/03EB857D-FFD6-AD3E-0592-FA9242DB1300

treatment provided by

Plazi

scientific name

Otiorhynchus (Zustalestus) rugosostriatus (Goeze, 1777)
status

 

Otiorhynchus (Zustalestus) rugosostriatus (Goeze, 1777) 

Material examined: 7 larvae ( Figs. 219View FIGURES 211 – 219, 228View FIGURES 226 – 231). Larvae were obtained from a field with a large population at Wiesbaden-Schierstein ( Germany, South Hesse), where the ornamental grass Panicum virgatum  L. was grown ( Figs. 223, 225View FIGURES 220 – 225), and from two breeding attempts in the climate chamber of the JKI in Braunschweig. Despite the data on the pest status in strawberry fields, breeding in flowerpots with different plants proved to be difficult and revealed only one time a small number of mature larvae: JKI, breeding in flowerpots with Dendranthema  x grandiflorum, 3 ex. on 0 5.01. 2012, and 4 ex. were collected in the above-mentioned field in Wiesbaden on 28.04. 2011.

Remarks about breeding and development. The life-cycle of the “Rough Strawberry Root Weevil” is rather simple, and Wilcox et al. (1934) were the first who reported about it in detail. It is widely confirmed by current studies in Wiesbaden-Schierstein (see Sprick 2012, in Sprick & Stüben 2012). Wilcox et al. (1934) stated that this weevil emerges about 2 weeks later in the season than Otiorhynchus ovatus  and that oviposition is delayed until August and September. By this, it is the species with the latest egg-laying activity of all Otiorhynchus  species in which this has been studied. Wilcox et al. (1934) also report that some adults do overwinter, too, but that there are also sites without overwintering adults. In Wiesbaden-Schierstein overwintering adults and mature larvae were found in spring (larvae in April and May) and a few pupae and a newly hatched, white-colored adult on 31.05. 2014 (Sprick 2012, in Sprick & Stüben 2012) ( Fig. 230View FIGURES 226 – 231). Only one month later no more pupae or larvae could be found, despite of an intensive search at this locality with very high abundance of adult weevils. Young adults were found from June to mid-July and very rarely later in the season. Apparently there is a delay in egg deposition as Otiorhynchus  species usually do not need more than 3 weeks to start with oviposition after emerging on the soil surface.

Body part Setal code A B C D E F G H I J K L M N

Head capsule des (dοrsal epicranial) 4 4 4 4 4 4 4 4 4 4 4 4 4 4 fs (frοntal epicranial) 2 2 2 2 2 2 2 2 2 2 2 2 2 2 les (lateral epicranial) 2 2 2 2 2 2 2 2 2 2 2 2 2 2 ves (ventral epicranial) 1 1 1 1 1 0 1 1 1 1 1 2 2 1 pes (pοsteriοr epicranial) 0 0 1 0 0 0 0 0 0 0 0 0 0 1 lms (labral) 3 3 3 3 3 3 3 3 3 3 3 3 3 3 cls (clypeal) 0 2 2 2 2 1 1 2 2 2 2 1 1 2 mds (mandibular) 2 2 2 2 2 2 2 2 2 2 2 2 2 2

Epipharynx als (anterοlateral) 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ams (anterοmedial) 2 2 3 3 2 3 3 2 2 2 2 2 3 2 mes (medial) 2 1 2 2 2 2 2 2 2 2 2 2 2 2

Maxilla dms (dοrsal malar) 7 7 8 6 6 5 4 7 7 7 6 5 7 6 vms (ventral malar) 4 4 4 4 3 4 3 4 4 4 4 4 3 4 stps (stipital) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 pfs (palpiferal) 2 2 2 2 2 2 2 2 2 2 2 2 2 2 mbs (malar basiventral) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 mxps (maxillary palpal) 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Labium prms (premental) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ligs (ligular) 2 2 2 2 2 2 1 2 2 2 2 2 2 2 so (sensοry οrgan) 0 0 1 0 0 0 0 0 0 0 0 0 1 0 pms (pοstmental) 3 3 3 3 3 3 3 3 3 3 3 3 3 3

Prothorax prns (prοnοtal) 7 10 10 9 8 8 9 9 8 9 9 10 7 8 prns 1 (macrοsetae) 4 + 3 5 + 5 4 + 6 3 + 6 4 + 4 4 + 4 4 + 5 4 + 5 4 + 4 4 + 5 4 + 5 4 + 6 6 + 1 4 + 4 prns 2 (micrοsetae) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ps (pleural) 2 2 2 2 2 2 2 2 2 2 2 2 2 2 eus (eusternal) 1 1 1 1 1 1 1 1 1 1 1 1 1 1 pda (pedal area) 5 5 6 5 5 4 4 4 5 5 5 5 6 4 ......continued on the next page Description ( Figs. 144–154View FIGURES 144 – 149View FIGURES 150 – 154).

Coloration. Head light brown; all thoracic and abdominal segments from dirty yellow to brown.

Body elongated ( Fig. 144View FIGURES 144 – 149). Chaetotaxy: Setae different in length, relatively long, filiform, bicolored (basal part brownish, apical white). Thorax. Prothorax with 4 long and 4 medium long to short prns; and 2 ps, different in length. Mesothorax with 1 medium long prs; 4 pds (ordered: 2 medium long, 1 long and 1 medium long); 1 medium long as; 1 medium long eps; and 1 long ps. Chaetotaxy of meso- and metathorax similar, except pds (ordered: 1 medium long, 1 long and 2 medium long). Each pedal area of thoracic segments well isolated, with 5 pda, different in length. Each thoracic segment with 1 short eus ( Fig. 145View FIGURES 144 – 149). 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 minute sps [abd. seg. VIII only with 1 minute sps and 4 pds (1 long, 1 very short, 1 long, and 1 medium long)]; 2 eps, different in length; 1 long and 1 minute ps; 1 medium long lsts; and 2 eus ( Figs. 146, 148, 149View FIGURES 144 – 149). Abdominal segment IX with 3 ds, different in length; 1 ps very long; and 2 sts, equal in length ( Figs. 147–149View FIGURES 144 – 149). Lateral lobes of abdominal segment X with 2–3 minute ts each.

Head subglobose, slightly narrowed bilaterally ( Fig. 150View FIGURES 150 – 154). 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; 1 short ves; and 1 minute pes; all des, les and fs equal in length. Stemmata (2 pairs) well visible. Antennal segment membranous, bearing 1 conical sensorium and 2–3 filiform sensilla. Clypeus 3.7 times as wide as long with 2 cls, placed anterolaterally ( Fig. 151View FIGURES 150 – 154). Labrum about 2 times as wide as long with 3 straight lms of different length, placed medially or mediolaterally; lms 2 distinctly longer than other setae, lms 1 and lms 3 only a little exceeding the outline of the labrum; the anterior margin of labrum double sinuate ( Fig. 151View FIGURES 150 – 154). Epipharynx with 3 finger-like als, different in length; 2 ams, different in length; and 2 very short mes, labral rods (lr) elongated, almost parallel; surface of epipharynx densely covered by triangular, cuticular processes ( Fig. 152View FIGURES 150 – 154). Mandible ( Fig. 153View FIGURES 150 – 154) feebly bifid, teeth almost of equal height; with 2 mds, different in length; internal edge with a small triangular tooth. Maxilla ( Fig. 154View FIGURES 150 – 154) with 1 very long stps and 2 very long pfs, placed ventrolaterally; 1 very short mbs, situated ventrally. Mala with 6 dms, different in length and 4 vms, straight, almost equal in length. Maxillary palpi with two palpomeres; basal palpomere a little larger than distal; basal palpomere with 1 mxps; distal palpomere with a group of 7 conical, cuticular processes apically; each palpomere with a sensillum. Praelabium heart-shaped ( Fig. 154View FIGURES 150 – 154), with 2 very short ligs and 1 long prms. Labial palpi with two palpomeres, relatively elongated; basal palpomere longer than distal; praemental sclerite well visible. Postlabium with 3 pms, different in length; pms 2 very long, at least 5 to 6 times as long as pms 1 and pms 3 ( Fig. 154View FIGURES 150 – 154).

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