Premnobius ambitiosus (Schaufuss)

Atkinson, Thomas H., Flechtmann, Carlos A. H. & Petrov, Alexander V., 2023, Synopsis of the Neotropical Premnobiina (Coleoptera: Curculonidae: Scolytinae Ipini) with descriptions of new species, new synonymy and keys to species, Zootaxa 5249 (1), pp. 69-91 : 73-74

publication ID	https://doi.org/10.11646/zootaxa.5249.1.4
publication LSID	lsid:zoobank.org:pub:A19BA431-94FE-47A1-9C35-E4BB426ED4DE
DOI	https://doi.org/10.5281/zenodo.7685273
persistent identifier	https://treatment.plazi.org/id/038387B6-1A12-5C62-7D85-F949FC38FDE9
treatment provided by	Plazi (2023-02-28 08:01:51, last updated 2024-11-24 23:42:30)
scientific name	Premnobius ambitiosus (Schaufuss)
status

Treatment

Premnobius ambitiosus (Schaufuss) View in CoL View at ENA

Fig. 5 C,D View FIGURE 5

Xyleborus ambitiosus Schaufuss, 1897: 109 .

Premnobius ambitiosus (Schaufuss) View in CoL : Eggers 1922: 173.

Premnobius cavipennis spinosus Hagedorn, 1908: 376 View in CoL . Synonymy: Eggers 1922: 173.

Premnobius brasiliensis Nunberg, 1960: 490 View in CoL . Synonymy: Schedl 1960: 107.

Similar species. This is the largest and most robust species found in the Neotropical region. It most closely resembles P. cavipennis View in CoL , but is much larger.

Diagnosis. Length 3.0– 3.3 mm, 3.0 × as long as wide ( Wood 2007: 368). Color dark reddish brown, body covered with fine, short pubescence. Frons granulate-punctate, with a faint longitudinal carina extending to the epistoma. Anterior margin of pronotum rounded, without marginal teeth. Pronotal summit slightly before middle, anterior asperities small and irregular. Elytral disc with interstriae 4 × as wide as striae, striae not impressed. Vestiture of recumbent strial setae, with mostly uniseriate strial setae, these becoming longer and stouter posteriorly. Declivity occupying about 40% of elytral length, the basal portion of first interstriae depressed; raised posterolateral crest beginning on interstria 2 and continuing to apex. Declivital face weakly concave, with large confused strial and interstrial punctures, pubescence absent. Crest with irregular denticles throughout. Longest near middle, toothlike, slightly incurved; a much smaller tooth at base of declivity on interstria 3. Marginal teeth and denticles on crest shorter than surrounding pubescence.

Distribution: Introduced from the Afrotropical region. The earliest collection records in Colombia and Brazil are from 1958. Widely distributed in South America and Panama to south-central Brazil ( Fig. 12 B View FIGURE 12 ). This is a large and distinctive species and it is surprising that there are so few records.

References

Eggers, H. (1922) Neue Borkenkafer (Ipidae) aus Afrika. Entomologische Blatter, 18, 163 - 174.

Hagedorn, J. M. (1908) Diagnosen bisher unbesscriebener Borkenkafer (Col.). Deutsche Entomologische Zeitschrift, 3, 369 - 382. https: // doi. org / 10.1002 / mmnd. 48019080310

Schaufuss, C. F. C. (1897) Borkenkafer-Studien. Berliner Entomologische Zeitschrift, 42 (1 - 2), 101 - 102. https: // doi. org / 10.1002 / mmnd. 18970420109

Schedl, K. E. (1960) Zur Synonymie der Borkenkafer, V. 181. Beitrag zur Morphologie und Systematik der Scolytoidea. Entomologische Blatter, 56, 103 - 112.

Wood, S. L. (2007) Bark and ambrosia beetles of South America (Coleoptera: Scolytidae). Monte L. Bean Science Museum, Provo, Utah, 900 pp.

Figures

FIGURE 5. Dorsaland posterolateral views of declivities of Neotropicalspecies of Premnobius, part 2.A,B. P.browneiAtkinson & Flechtmann; C,D. P. ambitiosus (Schaufuss); E,F. P. cavipennis Eichhoff. Photographs by T.H. Atkinson.

FIGURE 12. Known localities for Neotropical species of Premnobiina. A. Premnobius cavipennis; B. Premnobius ambitiosus; C. Premnobius perezdelacrucei; D. Premnobius species.; E,F. Premnophilus species. Species are grouped only to avoid overlap of collection localities on maps. No ecological or systematic relationships are implied.