Neochlamisus bebbianae ( Brown, 1943 ) III, III

Chaboo, Caroline S., Brown, Christopher G. & Funk, Daniel J., 2008, Faecal case architecture in the gibbosus species group of Neochlamisus Karren, 1972 (Coleoptera: Chrysomelidae: Cryptocephalinae: Chlamisini), Zoological Journal of the Linnean Society 152 (2), pp. 315-351: 325-327

publication ID 10.1111/j.1096-3642.2007.00343.x

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Neochlamisus bebbianae ( Brown, 1943 ) III


Neochlamisus bebbianae ( Brown, 1943) III   :

Betula nigra host   form ( Figs 7 View Figure 7 , 8 View Figure 8 )

Egg case ( Fig. 7B–F View Figure 7 ): Size (N = 10): L, 0.89– 1.28 mm; W at roof, 0.79–0.84 mm. Colour: unevenly dark-brown/black. Shape: bell-like, symmetrical in lateral aspect; apex conical. Egg stalk: present basally, short, translucent, slender. Roof: transverse ( Fig. 7C View Figure 7 ) in lateral aspect, discoid, flattened, not convex; margin simple, not flanged. External surface: coarse with overlapping faecal plates ( Fig. 7E, F View Figure 7 ); plates most apparent apically, their margins exposed apically; short, discontinuous longitudinal ridges present, spanning two or three scales ( Fig. 7D View Figure 7 ). Internal surface: smoother than external surface; slight space between case wall and egg. Trichomes: present, simple, dense, deeply embedded in faecal matrix.

Larva-I case ( Fig. 8A View Figure 8 ): Size (N = 4): L, 1.53–1.89 mm; W at base opening, 1.51–2.89 mm. Colour: uneven brownish-black. Shape: asymmetrical in lateral view; egg case distinct, occupying two-thirds of the total case length; apex conical; egg stalk present or absent; base opening slightly transverse. Ventral surface: with suture extending subapically through egg case to basal margin; faecal rows, inserted adjacent to ventral suture, occupy triangular wedge; younger rows of medium brown colour. External surface: rough, faecal rows orientated longitudinally ventrad, transversely lateral, and dorsad. Internal surface: without plates or ridges; texture smoother and darker in larval section than egg section. Case walls: evenly thin, apex slightly thicker. Trichomes: present in larval section, sparse.

Larva-II case ( Fig. 8B, C View Figure 8 ): Size (N = 7): L, 3.84– 4.02 mm; W at base opening, 1.65–1.87 mm. Colour: uneven dark brown, larval sections appearing striate because of colour tone variation. Shape: tubular; asymmetrical in lateral view; ventral, lateral, and dorsal walls distinguishable by varying orientation of faecal rows; apex rounded. Egg case: apparent, shape distorted by ventral surface expansion. External surface: coarse, with larval faeces in rows. Ventral surface: with suture extending subapically to basal margin; adjacent triangular field occupying half of the ventral surface area. Base opening: oblique; ventral wall shorter than dorsal wall; margin simple. Internal surface: smooth, boundary between larval instars indistinct. Walls: slightly thicker apically than laterally. Trichomes: at medium density, some protuberant.

Larva-III case ( Fig. 8D View Figure 8 ): Size (N = 10): L, 5.12– 5.45 mm; W at base opening, 2.5–3.19 mm. Colour: unevenly brownish black with lighter brown striations. Shape: tubular, asymmetrical in lateral view with dorsal wall slightly longer than ventral wall, and egg case inclined ventrad. Egg case: distinguishable by position, surface texture, and colour; general shape distorted, split hemispherically by ventral suture and large ventral insertion of faeces. Ventral surface: with ventral suture extending from apex to base; adjacent longitudinal faecal rows slightly protuberant, occupying three-quarters of the ventral surface. Walls of larval sections: thicker than in egg case. Base opening: transverse, margin simple. Internal surface: smooth; plates, ridges, and rows, not apparent; larval sections not distinguishable. Trichomes: present, deeply embedded into matrix, with some protuberant.

Larva-IV case ( Fig. 8E View Figure 8 ): Size (N = 4): L, 4.85– 6.51 mm; W at base opening, 3.60–3.88 mm. Colour: uneven dark brownish black. Shape: barrel-like, asymmetrical with distinct ventral, lateral, and dorsal surfaces; egg case hemispherical, inclined ventrad, dissected by ventral suture; apex rounded. External surface: variable; densely covered with trichomes; trichome coat thick dorsally, thinner ventrally. Ventral suture: extending from apex to base; larval faecal insertion occupying most of ventral surface. Base opening: transverse, margin simple. Internal surface texture: smoothened; walls evenly thin, apex wall slightly thicker.

Pupal case ( Fig. 8F, G View Figure 8 ): Size (N = 4): L, 6.27– 7.54 mm; W at base opening, 5.25–6.02 mm. Shape: texture and colour as in late larval case IV; basal seal lacking trichome coat.