Ctonoxylon hirsutum Hagedorn, 2024

Jordal, Bjarte H., 2024, An integrated taxonomic revision of Ctonoxylon (Coleoptera, Curculionidae, Scolytinae) reveals new Malagasy species originating from multiple recent colonisations of the island, ZooKeys 1203, pp. 95-130 : 95-130

publication ID

https://doi.org/ 10.3897/zookeys.1203.123757

publication LSID

lsid:zoobank.org:pub:6FE93D4B-8104-45F4-850A-C1B78CA10A9D

DOI

https://doi.org/10.5281/zenodo.11373310

persistent identifier

https://treatment.plazi.org/id/B0D4CA0E-BC35-55C0-B267-5E466C7632BA

treatment provided by

ZooKeys by Pensoft (2024-05-28 19:19:19, last updated 2024-11-26 05:18:20)

scientific name

Ctonoxylon hirsutum Hagedorn
status

stat. nov.

Ctonoxylon hirsutum Hagedorn View in CoL stat. rev.

Figs 23 View Figures 21–29 , 26 View Figures 21–29 , 29 View Figures 21–29

Ctonoxylon camerunum hirsutum Hagedorn, 1910: 4. View in CoL

Ctonoxylon flavescens hirsutum Hagedorn View in CoL , transfer by Eggers 1920 and Schedl 1961.

Type material.

Syntype (metatype sensu Eggers): Kamerun, Conradt leg. [ NHMW] .

Diagnosis.

Body length 2.5–3.0 mm, 2.2–2.3 × as long as broad; colour pale brown. Male frons slightly flattened on lower half, very slightly shrivelled, surface finely rugose above, female frons smooth, vestiture in the frons of both sexes consisting of fine setae. Eye parts separated by the size of upper eye; antennal club sutures not clearly marked; anterior lateral margin of prothorax at middle with acute eye scraper; a sharp carina running from eye scraper to near procoxa; propleural pit absent; elytral vestiture on each interstriae consisting of two irregular rows of slightly curved bristle-like setae and scattered very fine hair-like setae; elytral suture straight; elytral apex slightly emarginated, a few small and sharp tubercles along the posterior margin. Metanepisternum with mixed short plumose and hair-like setae; metaventrite with simple hair-like setae; these sclerites on its anterior third glabrous, with a vertically curved swollen trace of mesotibia’s resting position.

Distribution.

Ghana, Cameroon, Democratic Republic of the Congo, Gabon.

New records.

Cameroon, Ekande, 5 km N Limbe [GIS: 4.081, 9.172], 1100 m alt., ex unknown liana, 18. XI. 2007, A. Breistøl, leg. [1, ZMUB] GoogleMaps ; Cameroon, Mbalmayo Forest Reserve, Eboufek [GIS: 3.499, 11.883], 28. 07. 1993, FIT [1, NHMUK] GoogleMaps ; Republic of the Congo, 40–60 km ESE of Bomassa [2.04, 16.59], 18. 04. 1993, D. H. Chadwick leg. [1, USNM] .

Biology.

All records are from lowland rainforest sites in the western parts of Africa. It was previously collected from latex rich lianas ( Schedl 1961). In the current study two further specimens were dissected from a dead liana together with specimens of C. pilosum sp. nov. One specimen was also collected in a flight intercept trap [ NHMUK].

Comments.

Very similar to C. flavescens , except the elytral interstriae have fine pubescent ground vestiture and the two teeth near the anterior margin of the pronotum are subcontiguous. Previously designated as a variety of C. flavescens , but with a type designated, a subspecies name given and published by Hagedorn (1910). Sufficient diagnostic features as detailed by Eggers (1920), and molecular data demonstrating deep divergence from C. flavescens (Table 4 View Table 4 ), strongly support species status for the name hirsutum . Records from Ghana and Gabon (see Schedl 1961) could not be verified but these seem likely given several validated records from nearby countries.

Eggers H (1920) 60 Neue Borkenkäfer (Ipidae) aus Afrika, nebst zehn neuen Gattungen, zwei Abarten. (Fortsetzung). Entomologische Blätter 16: 33–45.

Hagedorn JM (1910) Diagnosen bisher unbeschriebener Borkenkafer. Deutsche Entomologische Zeitschrift 1910 (1): 1 - 13. https: // doi. org / 10.1002 / mmnd. 4801910101

Hagedorn JM (1910) Diagnosen bisher unbeschriebener Borkenkäfer. Deutsche Entomologische Zeitschrift 1910 (1): 1–13. https://doi.org/10.1002/mmnd.4801910101

Schedl KE (1961) Scolytidae und Platypodidae Afrikas. Band I (part). Familie Scolytidae. Revista de Entomologia de Moçambique 4: 335–742.

Gallery Image

Figures 21–29. Dorsal, lateral, and front views of male 21, 24, 27 Ctonoxylon flavescens 22, 25, 28 Ctonoxylon bosqueiae holotype, and 23, 26, 29 Ctonoxylon hirsutum stat. rev.

NHMW

Naturhistorisches Museum, Wien

ZMUB

Museum of Zoology at the University of Bergen, Vertebrate collections

NHMUK

Natural History Museum, London

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Curculionidae

SubFamily

Scolytinae

Genus

Ctonoxylon