Tyloderma neomorbillosum Wibmer, 1981
Family: Curculionidae
Tyloderma neomorbillosum image
Michael Jansen  
3. Tyloderma neomorbillosum Wibmer, new species Holotype male.-Body oval, strongly convex; cuticle matte, antennae dark brown; with short, moderately broad to broad, whitish to yellowish, recumbent scales, mostly as small spots. Rostrum with punctures in longitudinal to oblique rows on basal 3/5. Head with frontal sulcus medium sized; punctures large, deep, unevenly moderately dense above and between eyes, much smaller, shallower and sparser toward vertex. Prothorax ca. 1/20 wider than long, moderately constricted on flanks, not constricted dorsally near apex, sides diverging strongly in basal 2/5, converging strongly to constriction, then moderately toward apex; pronotal disc with scales on each side primarily as 1 spot ca. 2/5 from base, and 1 ca. 3/5 from base, closer to midline; impunctate median line very distinct on basal 4/5; punctures unevenly dense, generally separated by 1/2 their own diameters or less on disc, more irregular on flanks. mytra 1.37 times as long as wide, 1.97 times as long as prothorax, humeri rounded, moderately prominent, sides diverging weakly in ca. basal l/2, then converging toward apex; scales on each elytron primarily as spot on side Of scutellum, spot on stria 5 ca. 1/6 from base, spot on interval 4 ca. 1/4 from base, and narrow band across declivity not reaching suture; strial punctures on basal 1/2 very irregularly shaped, much larger than pronotal punctures, generally separated by 1/2 their own diameters or less, both size and depth decreasing rapidly toward apex; strial grooves subobsolete; intervals sinuate on basal 3/5 (strongly so on basal 1/6), moderately convex. Mesosternum with lateral processes ca. 2/3 from anterior margin, distinct, posterior margin moderately wide; surface with punctures primarily along midline and anterior margin, medium sized, moderately deep, dense, each with medium sized, moderately coarse seta, subrecumbent along anterior margin, suberect on remaining areas. Metasternum weakly concave along midline; punctures smaller, shallower on lateral areas. Abdomen with sternum 1 weakly concave along midline; punctures medium to large, deep, unevenly moderately dense on sterna 1 &: 2. Legs with femur densely covered with short to medium, fine to moderately coarse, subrecumbent setae; tibia with surface strongly rugosely striate, densely covered with short to medium, fine to moderately coarse, subrecumbent to suberect setae; praemucro medium sized on pro- and mesotibiae, minute on metatibiae, ca. 1/8 from apex, more or less perpendicular to axis of tibia. Genitalia: fig. 71. Length (pronotum + elytra): 4.45 mm. (1.50 + 2.95). Allotype female.-Metasternum nearly fiat on median area, abdominal sternum 1 weakly convex; praemucro large. Genitalia: fig. 100. Length (pronotum + elytra): 4.90 mm. (1.60 + 3.30). Intraspecific variation.-The rostrum is 1.62-1.82 times as long as its width at the apex. The punctures on the head above and between the eyes are sometimes moderately deep and moderately sparse. The prothorax has a ratio (length/width) of 0.94-1.12 (1.02 ± 0.04), widest between nearly 2/5 from the base and the middle. Sometimes the spots of scales on each side of the disc are closer to each other as an oblique band. The impunctate median line may be only moderately distinct. The punctures on the disc are sparser or denser. The elytra are 1.28-1.41 (1.34 ± 0.04) times as long as wide, and 1.67-1.97 (1.78 ± 0.08) times as long as the prothorax, their widest point located between about 3/10 and 3/5 from the base. The strial punctures may be more regularly shaped, and then the intervals are less sinuate, and the strial grooves may be more or less evident on the apical 1/2. The posterior end of the mesosternum is very protuberant in 1 specimen. In some females the praemucro is weakly oblique to the axis of the tibia and directed toward the uncus. Length, pronotum + elytra: 3.60-5.65 mm. (4.51 ± 0.40). Remarks and comparative notes.-This species can be separated from all others in the Foveolatum group by its more robust, strongly convex body (especially with its relatively short elytra), and by its limited scale pattern. Compare also the known distributions of the 5 species (figs. 128 &: 129). All the specimens of Tyloderma from the Pacific Northwest that I have examined belong to this species, including some from the Van Dyke collection (CASC). Although I have not seen any of the specimens studied by Hatch, I assume a misidentification on his part also, as morbillosum is presently known only from San Francisco, California. Hatch's illustration is clearly neomorbillosum. Etymology. I have selected this name to indicate the fact that this species has been confused with morbillosum. Type-1008iity.-U.S.A., Washington, Thurston County, Grand Mound.