Otiorhynchus

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: 26-29

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-FFE0-AD16-0592-F94F42DB11EC

treatment provided by

Plazi

scientific name

Otiorhynchus
status

 

Otiorhynchus  (s. str.) aurifer Boheman, 1843 

Material examined: 11 larvae ( Figs. 211View FIGURES 211 – 219, 226View FIGURES 226 – 231). JKI, Braunschweig, breeding with Ligustrum ovalifolium Hassk.  and Viburnum tinus  L. flowerpots ( Fig. 224View FIGURES 220 – 225), 0 5.01 .2012, 7 ex.; some pots were transferred then to Hannover, CURCI, for regular pupae search. 1 larva was taken out from a flowerpot with L. ovalifolium  on 16.01. 2012 and another ex. on 27.01. 2012. A second attempt with 80 first instar larvae was started on 24.08. 2012 with Ligustrum ovalifolium  and L. vulgare  (2 flowerpots each) in the JKI and revealed 2 ex. on 10.01. 2013.

Additional material: another 8 mature larvae (and 1 pupa) from the second breeding attempt had already been obtained on 14.12. 2012.

Remarks about breeding and development. Larvae were exclusively obtained from two breeding attempts in the climate chamber of the JKI in Braunschweig. In September and October a large number of eggs and some dozens of first instar larvae were released on 4 flowerpots with Ligustrum ovalifolium  (2 pots) and Viburnum tinus  (2 pots). The parents of these eggs were collected on 0 6.09. 2011 in Heilbronn, former south station, close to “Alter Kaiser”, from Viburnum tinus  and Ligustrum vulgare  at roadside plantations and front garden hedgerows. This occurrence was discovered a few months before by Klaus Schrameyer and the first record in Baden-Württemberg ( Schrameyer & Bernau 2011). The first mature larvae were obtained in the beginning of January 2012 (05.01.). In Germany, this species of Mediterranean origin is known to occur only in two regions (cities of Hamburg and Heilbronn).

Apparently there is no paper that deals with the life-cycle of this species. These data could be a first contribution on the bionomics of Otiorhynchus aurifer  . In 2011, breeding was started on 21.09., but only with 8 L l larvae, the majority of larvae, over 100, were released on the plants on 28.10. 2011. This is more exact than reported before in Gosik & Sprick (2012 a). 6 pupae were obtained on 27.01. 2012 and again 6 from 0 9.02. during February 2012. In 2012, breeding was started on 24.08. and revealed the first mature larvae and 1 pupa mid-December. Therefore, the time required to receive pupae from L l larvae was 3–4 months under controlled conditions in the lab, and—opposite to several other [Central European] species—no diapause or developmental delay was observed.

In Baden-Württemberg, this species was introduced with Laurus nobilis  L. very likely in 2003 to Heilbronn- Horkheim, and in 2008 it was found on wayside plantations and front garden hedgerows with Ligustrum vulgare  and Viburnum tinus  in the southern part of the city ( Schrameyer & Bernau 2011). The origin of the Laurus  plants was Italy. Yunakov & Nazarenko (2003) reported about the first record in Ukraine in the town of Sevastopol (Crimea) in 1951, and in Jalta this species was found on Laurus, Rosa  and in the botanical garden Nikita nearby on Olea  . Heijerman & Drost (2000) reported about the first finding in The Netherlands in 1999 on different bushes, and Crovetti (1971) about an occurrence as noxious species in Sardinia on Citrus  .

Description ( Figs. 67–77View FIGURES 67 – 72View FIGURES 73 – 77).

Coloration. Head dark yellow; all thoracic and abdominal segments from yellow to dark yellow.

Body elongated ( Fig. 67View FIGURES 67 – 72). Chaetotaxy: Setae different in length, relatively short, filiform. Thorax. Prothorax with 4 long and 5 medium long to short prns and 2 ps, different in length. Mesothorax with 1 short prs, 4 pds (ordered: 2 short and 2 long), 1 long as, 1 long eps and 1 long ps. Chaetotaxy of meso- and metathorax similar. Each pedal area of thoracic segments well isolated, with 4 pda, different in length. Each thoracic segment with 1 short eus ( Fig. 68View FIGURES 67 – 72). 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 microseta], 2 eps, different in length, 1 long and 1 very short ps, 1 long lsts and 2 eus ( Figs. 69, 71, 72View FIGURES 67 – 72). Abdominal segment IX with 3 ds, different in length, 2 ps, different in length and 2 sts, equal in length ( Figs. 70–72View FIGURES 67 – 72). Lateral lobes of abdominal segment X with 1–2 minute ts each.

Head subglobose, narrowed bilaterally ( Fig. 73View FIGURES 73 – 77). Head capsule with 4 medium long des, des 1 and des 2 placed on central part of epicranium, des 3 located on frontal suture, des 5 located anterolaterally; 2 medium long fs, fs 4 placed anteromedially, fs 5 located near to antenna; 2 medium long les; and 1 medium long ves. Stemmata (1 pair) feebly visible. Antennal segment membranous, bearing 1 conical sensorium and 3–4 filiform sensilla. Clypeus 3.3 times as wide as long with 1 short cls, placed posterolaterally ( Fig. 74View FIGURES 73 – 77). 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, all lms exceeding the outline of the labrum; the anterior margin of labrum almost rounded ( Fig. 74View FIGURES 73 – 77). Epipharynx with 3 finger-like als, different in length; 3 ams, different in length, one ams similar in shape to mes, but the position is more to ams; and 2 very short mes (see comments about ams and mes in Material and Methods); labral rods (lr) elongated, strong convergent ( Fig. 75View FIGURES 73 – 77). Mandible ( Fig. 76View FIGURES 73 – 77) bifid, teeth almost of equal height; with 2 mds, different in length; internal edge with a triangular tooth. Maxilla ( Fig. 77View FIGURES 73 – 77) with 1 very long stps and 2 very long pfs, placed ventrolaterally; without mbs. Mala with 4 dms, different in length and 3 straight vms, almost equal in length. Maxillary palpi with two palpomeres of almost equal length; basal palpomere with 1 mxps; distal palpomere with a group of 5 conical, cuticular processes apically; each palpomere with a sensillum. Praelabium heart-shaped ( Fig. 77View FIGURES 73 – 77), with 1 very short ligs and 1 very long prms. Labial palpi with two palpomeres, relatively elongated; both palpomeres almost equal in length. Praemental sclerite well visible. Postlabium with 3 pms, different in length; pms 2 very long, 5 times as long as pms 1 and pms 3 ( Fig. 77View FIGURES 73 – 77).

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