Baltocar, SUCCINICUS (VOSS)

Riedel, Alexander, Rolo, Tomy Dos Santos, Cecilia, Angelica & Kamp, Thomas Van De, 2012, Sayrevilleinae Legalov, a newly recognised subfamily of fossil weevils (Coleoptera, Curculionoidea, Attelabidae) and the use of synchrotron microtomography to examine inclusions in amber, Zoological Journal of the Linnean Society 165 (4), pp. 773-794 : 779-780

BALTOCAR SUCCINICUS (VOSS) ( FIGS 11–15 )

Car succinicus Voss, 1953: 125–126 , fig. 4. Baltocar succinicus (Voss) , Kuschel, 1992: 197.

Differential diagnosis: Pronotum ( Fig. 13 ) elongate, 1.4 ¥ longer than wide; sides weakly sinuate, subparallel; disc coarsely punctate, reticulate; setae usually raised above integument, somewhat widened, anteriorly scale-like. Tarsi with onychium subequal in length to tarsomere 1.

Holotype: Figures 11–15 . The amber piece ( Fig. 11 ) is dull except for one smooth surface close to the specimen. Thus the specimen can only be viewed from one side. A number of cracks and milky occlusions cover large parts of the specimen and further impede observation. A bubble (partly exposed) hangs over the basal left side of the pronotum, the scutellum, and the left elytral humerus.

Redescription: Total length from elytral apex to base of rostrum c. 2.0 mm. Head including rostrum 0.89 mm long. Eyes lateral, large, protruding, coarsely facetted, the ommatidia distinctly convex. Eyes medially well separated by c. 0.7 ¥ minimum width of rostrum. Rostrum subcylindrical, in dorsal view subapically about 1.5 ¥ wider than in front of antennal insertion; weakly curved, length subequal to pronotum (in lateral aspect 0.59 mm); in apical 1/4 ventrally with one erect, stout seta. Mouthparts in apical 0.18 of rostrum. Mandibles fully opened, with three teeth on outer edge each, none on inner edge. Antenna. Total length 0.82 mm, length of club 0.28 mm. Insertion laterally in basal 1/5 of rostrum, 0.096 mm from base; nongeniculate; scape elongate, extending to anterior 1/4 of eye; article 1 of funicle swollen, thicker, and shorter than scape (0.7 ¥); article 2 of funicle more slender, c. 2 ¥ longer than wide; articles 3–7 of funicle decreasing in length and slightly increasing in width, article 7 globiform. Antennal club distinct, somewhat loose, about 2 ¥ wider than funicle. Terminal article of club 1.5 ¥ longer than wide. Prothorax ( Fig. 13 ) relatively narrow, length 0.58 mm, apically and basally width subequal, 0.36 mm, maximum width 0.41 mm; side nearly straight; without subapical or sub-basal constriction; pronotum coarsely punctate; vestiture of apicad directed setae coarse, somewhat raised above integument; notosternal suture distinct, closed. Procoxa subconical, prominent. Elytra. Length 1.4 mm; maximal width 0.96 mm; between distinct humeri width 0.80 mm; coarsely striate; erect sensory hairs sparse, short, fine; vestiture partly raised, coarse. Legs. Tibiae straight, slender; protibia (0.50 mm) slightly longer than profemur (0.49 mm); left mesotibia apically with two spurs. Tarsi. Tarsomere 1 of protarsus 0.15 mm, c. 3 ¥ longer than wide; tarsomere 2 of protarsus 0.13 mm long, apically truncate and not deeply excised; tarsomere 3 of protarsus c. 0.10 mm long; onychium of protarsus 0.16 mm long; claws divaricate, simple. Abdomen. Ventrites 1–3 visible, sutures distinct.

BALTOCAR GROEHNI RIEDEL SP. NOV. ( FIGS 16–22 ,

Figures

Figures 11–15. Baltocar succinicus, holotype: 11, amber, arrow marking inclusion; 12, labels; 13, pronotum; 14, habitus in anterolateral aspect; 15, head; arrow marking left exodont mandible.

Figures 16–22. Baltocar groehni Riedel sp. nov., holotype: 16, habitus; right side; 17, mouthparts in lateroapical aspect; mandibles are marked with arrows; note axis slanting ventrad; 18, mouthparts in apical aspect; 19, habitus; dorsal aspect; 20, detail of Figure 19; note scutellary strioles; 21, pronotum; dorsal aspect; 22, amber, arrow marking inclusion. Abbreviations: L, labial palps; M, maxillary palps.