Dynamis borassi (Fabricius, 1801)

Vásquez-Ordóñez, Aymer Andrés, Löhr, Bernhard Leo & Marvaldi, Adriana Elena, 2020, Comparative morphology of the larvae of the palm weevils Dynamis borassi (Fabricius) and Rhynchophorus palmarum (Linnaeus) (Curculionidae: Dryophthorinae): Two major pests of peach palms in the Neotropics, Papéis Avulsos de Zoologia 60 (27), pp. 1-14 : 7-8

Dynamis borassi (Fabricius, 1801)

Mature larva: Figs. 1 A-C, 2A, C, 3B, 4A, C-D, G-H, 5A, C, E, 7A, 7C-E, G-I.

First instar larva: Figs. 8A , C-F, 9A-C.

Maximum dimensions: 52.9 × 23.6 mm, head width 10.5 mm. Chaetotaxy (see Table 1).

Frons ( Figs. 2A , 8C , 9A ) with two setae well developed (fs3 and fs5), fs4 minute (earlier instars) or short. Epipharynx ( Figs. 3B , 4A ): five (earlier instars) to eight anterolateral setae (als) on each side, none placed proximally near the limit with clypeus; median epipahryngeal setae 2 (mes2) thick, more widely separated than mes1, the latter smaller but well developed, distinct; mesal area of epipharynx (between labral rods) with asperities evenly distributed, not leaving a glabrous area; labral rods V-shaped, less widely separated towards their proximal junction than between their distal tips. Maxillae ( Figs. 5A, C, E ): with dorsal malar setae (dms) without pubescence at their bases; number of dms about 20 (earlier instars with fewer setae). Hypopharynx ( Fig. 5C ) more densely setose laterally than anteriorly. Abdominal posterior disc ( Fig. 7A ) with lateral margins inwardly curved, with seta-bearing lobes defined by sinuate posterior margin (weakly so in first instar).

Figures

Figure 1. Habitus of mature larva (lateral,ventral,dorsal).(A-C) Dynamisborassi (Fabricius);(D-F) Rhynchophoruspalmarum (Linnaeus).Scale bars:5 mm.

Figure 2. Head of larva, anterodorsal: (A) Dynamis borassi (Fabricius); (B) Rhynchophorus palmarum (Linnaeus). (C) D. borassi, postoccipital membrane showing cervical sclerites;(D) R.palmarum, antenna,apical.Scale bars:A and B = 2 mm, C = 0.4 mm,D = 0.1 mm.

Figure 3. Larval mouthparts.(A) Rhynchophorus palmarum (Linnaeus),clypeus and labrum;(B) Dynamisborassi (Fabricius),epipharynx;(C) R.palmarum, epipharynx.Scale bars:0.5 mm.

Figure 4. Larval mouthparts. Dynamis borassi (Fabricius):(A) epipharynx;(C-D,G-H) mandible in dorsal,outer,ventral and inner views.Rhynchophorus palmarum (Linnaeus):(B) epipharynx;(E-F,I-J) mandible in dorsal,outer,ventral and inner views.Scale bars:0.5mm.

Figure 5. Maxillae and labium of larva. Dynamisborassi (Fabricius):(A) ventral;(C) dorsal;(E) detail of mala,dorsal.Rhynchophorus palmarum (Linnaeus):(B) ventral; (D) dorsal; (F) detail of mala, dorsal; (G) detail of dorsal malar setae; (H) detail of ventral malar setae; (I) detail of maxillary palp. Scale bars: A-D = 1 mm, E and F = 0.2mm, G and I = 0.1mm,H = 0.2 mm.

Figure 7. Larval abdominal apex showing posterior disc, dorsal: (A) Dynamis borassi (Fabricius); (B) Rhynchophorus palmarum (Linnaeus). Spiracles of D. borassi (external view, not at same scale): (C) thoracic; (D) abdominal I; (E) abdominal IV. (F) Thoracic spiracle and trachea of R. palmarum, seen from inside of body. (G,H) Spiracles and tracheal system of D.borassi,seen from inside of body:thoracic,abdominal IV.Abdominal spiracleVIII:(I) D.borassi; (J)R.palmarum. Scale bars: A and B = 2 mm,C and F-H = 0.2 mm,D and E = 0.1mm,I and J = 0.5 mm.

Figure 8. First instar larva. (A) Dynamis borassi (Fabricius),habitus dorsolateral;(B) Rhynchophorus palmarum (Linnaeus), habitus lateral.D.borassi: (C) head and pronotum,dorsal;(D) abdominal segments IVtoVII, dorsal,showing egg bursters;(E) detail of egg burster;(F) terminal dorsal disc (abdominal tergitesVIII and IX). Scale bars:A and B = 0.5mm,D = 0.2 mm,E = 0.03 mm.

Figure 9. First instar larva of Dynamis borassi (Fabricius): (A) head capsule, dorsal; (B) detail of right antenna; (C) head capsule, ventral. Scale bars: A and C = 0.2 mm, B = 0.02 mm.