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 traits, Zootaxa 4108 (1), pp. 1-67 : 53-54

Key to larvae of selected Otiorhynchus species

In this key, we included all species described in this paper and all species hitherto described, if chaetotaxy was considered sufficiently: Otiorhynchus ligustici , O. porcatus , O. salicicola (see Gosik & Sprick 2012 a), O. nodosus (see Willis 1964) and O. cribricollis (see Grandi 1913), Lockwood & Keifer (1930) and Rosenstiel (1987). Further comments are reported in the following chapter.

1. Prs and pds 1, 2, 4 on abdominal segment I short, filiform, and pds 3,5 long or very long ( Figs. 156–171).................... 2

- Prs and pds 1, 2, 4 on abdominal segment I thorn-like, dark brown, and pds 3,5, filiform, medium long ( Fig. 155)............................................................................ O. (Cryphiphorus) ligustici (Linnaeus) ( Fig. 205)

2. Postdorsum on metathorax with 5 pds ( Figs. 172–174)........................................................ 3

- Postdorsum on metathorax with 4 pds ( Figs. 175–186)....................................................... 6

3. Pds 3 on metathorax 2 times shorter than pds 2 ( Fig. 172). Pds 1 on abdominal segment I almost as long as pds 2 and pds 4 ( Fig. 156). Ds 2 on abdominal segment IX distinctly longer than ds 1 and ds 3 ( Fig. 188). Postlabium covered by cuticular processes..................................................................................................... 4

- Pds 3 on metathorax visibly longer than pds 2 ( Figs. 173, 174). Pds 1 on abdominal segment I 2–3 times as long as pds 2 and pds 4 ( Figs. 157, 158). Ds 2 on abdominal segment. IX shorter than ds 1 and ds 3 ( Figs. 189, 190). Postlabium smooth, covered by cuticular processes....................................................................................... 5

4. Pronotum with 7 prns, each thoracic segment with 5 pda, setae fine, rather short ( Fig. 2)................................................................................... Otiorhynchus (Arammichnus) indefinitus Reitter ( Fig. 203)

- Pronotum with 9 prns, each thoracic segment with 7 pda, setae well visible, relatively massive............................................................................................. O. (Arammichnus) cribricollis Gyllenhal

5. Pds 1 and pds 2 on metathorax equal in length ( Fig. 173). Meso- and metathorax with 2 as. Body greyish to brown, cuticle espe- cially on dorsal part covered with triangular cuticular processes and more pigmented than on lateral and ventral parts. Head dark brown, almost rounded. Surfaces of labrum densely covered by thorn-like cuticular processes...................................................................................... O. (Choilisanus) raucus (Fabricius) ( Fig. 204)

- Pds 1 on metathorax 3 times longer than pds 2 ( Fig. 174). Meso- and metathorax with 1 as. Body white to yellowish, cuticular processes very fine. Head light yellow, distinctly narrowed bilaterally. Surface of labrum smooth........................................................................................ O. (Pendragon) ovatus (Linnaeus) ( Fig. 217)

6. Meso- and metathorax with 4 pds, identical in length ( Figs. 175–183; 175 a– 183 a)................................... 7

- Meso- and metathorax with 4 pds, different in length ( Figs. 184–187; 184 a– 187 a).................................. 15

7. Meso- and metathoracic pds 1 and pds 2 equal in length (or almost equal length), both distinctly shorter than pds 3 ( Figs. 176–183)........................................................................................... 8

- Meso- and metathoracic pds 1 as long as pds 3, both distinctly longer than pds 2 ( Fig. 175)............................................................................................... O. (Pocodalemes) crataegi Germar ( Fig. 218)

8. Abdominal segment VIII with 5 pds (3 short and 2 long)...................................................... 9

- Abdominal segment VIII with 4 pds (2 short and 2 long) (Fig. 199).. O. (Metopiorrhynchus) singularis (Linnaeus) ( Fig. 208)

9. Abdominal segments I–VII with only 1 long sps (Figs. 191, 192)............................................... 10

- Abdominal segments I–VII with 1 long and 1 minute sps (Figs. 193–197)....................................... 11

10. Head light yellow. Body slender, milk-white. Clypeus with 1 cls ( Fig. 63).... O. (Otiorhynchus) armadillo (Rossi) ( Fig. 210)

- Head dark yellow. Body rather massive, yellowish. Clypeus with 2 cls ....... O. (Otiorhynchus) salicicola Stierlin ( Fig. 216)

11. Lms 2 slightly longer (maximum 1.33 times) than lms 1 and lms 3 ( Figs. 85, 96, 107, 118).............................. 12

- Lms 2 distinctly longer (2 times) than lms 1 and lms 3 ( Fig. 74)................. O. (Otiorhynchus) aurifer Boheman ( Fig. 211)

12. Setae of abdomen fine, transparent............................... O. (Otiorhynchus) meridionalis Gyllenhal ( Fig. 212)

- Setae of abdomen rather massive, brown or dark yellow.................... O. (Otiorhynchus) tenebricosus complex. 13

13. Eps 2 on abdominal segment I–VIII distinctly longer than eps 1 (at least 2 times, usually 3 times or more) (Fig. 197). Pms 3 dis- tinctly shorter than pms 1 and pms 2 ( Fig. 121)..................................... O. lugdunensis (Herbst) ( Fig. 215)

- Eps 2 on abdominal segment I–VIII slightly longer than eps 1 (no more than 2 times, usually 1.33 times or less) (Figs. 195, 196). Pms 3 slightly shorter or of the same length as pms 1 ( Figs. 99, 110)............................................. 14

14. Pms 3 as long as pms 1 ( Fig. 99). Pronotum with 4 long and 4 medium long prns ( Fig. 90)... O. clavipes (Bonsdorff) ( Fig. 213)

- Pms 3 slightly shorter than pms 1 ( Fig. 101). Pronotum with 4 long and 5 medium long prns ( Fig. 110)............................................................................................... O. fuscipes (Olivier) ( Fig. 214)

15. Abdominal segment VIII with 4 (2 long and 2 short) pds (Figs. 197, 199)........................................ 16

- Abdominal segment VIII with 5 (2 long and 3 short) pds ( Fig. 28).............................................. 17

16. Labral rods short, reniform ( Fig. 53). Epipharynx with nodular cuticular processes. Clypeus with 2 very short, poorly visible cls ( Fig. 53)...................................................... O. (Nehrodistus) armatus Boheman ( Fig. 209)

- Labral rods elongated ( Fig. 152). Epipharynx covered by thorn-like cuticular processes. Clypeus with 2 medium long cls ( Fig. 152)......................................................... O. (Zustalestus) rugosostriatus (Goeze) ( Fig. 219)

17. Setae on body elongated, fine, transparent. Body elongated. Abdominal segment IX mostly with 4 ds (Fig. 201)......... 18

- Setae on body relatively massive, yellow or brownish. Body moderately elongated. Abdominal segment IX with 3 ds (Fig. 202).......................................................... .. O. (Dorymerus) sulcatus (Fabricius) ( Fig. 206)

18. Clypeus with 1 medium long seta and 1 sensillum............................. O. (Postaremus) nodosus ( O.F. Müller)

- Clypeus with 2 setae and 1 sensillum................................... O. (Lolatismus) porcatus (Herbst) ( Fig. 207)