Lanurgus jubatus Jordal, 2021

Jordal, Bjarte H., 2021, The mainly South African genus Lanurgus revised (Coleoptera, Scolytinae), Zootaxa 5027 (1), pp. 87-106 : 94

Lanurgus jubatus Jordal , sp. nov.

urn:lsid:zoobank.org:act:4FDEFAC6-F119-40CD-8ECB-1266AB2EFE62

( Figs 14, 17, 20, 21 )

Type material. Holotype female: South Africa, Western Cape, Knysna, Goudveld, Krisjan-se-Nek [GIS: -33.913, 22.948], B. Jordal, leg., 5.xi.2006 #5, ex Olea capensis . Allotype and paratypes: same data as holotype (4); West Cape, Hoekwil, Woodville [GIS: -33.933, 22.639], B. Jordal, leg., 1.xi.2006 #3, ex Olea capensis (8); Knysna, Gouna, Grootdrai [GIS: -33.946, 23.054], B. Jordal, leg., 6.xi.2006 #2, ex Olea capensis (2); Nature’s Valley [GIS: -33.965, 23.562], B. Jordal, leg., 8.xi.2006 #5, ex Olea capensis (4); East Cape: Hogsback [GIS: -32.587, 26.936], B. Jordal, leg., 16.xi.2006 #3, ex Olea capensis (1).

Other material: West Cape, Knysna, Diepwalle [GIS: -33.957, 23.152], B. Jordal, leg., 3.xi.2006 #1, ex Olea capensis ; Knysna, Goudveld, Krisjan-se-Nek [GIS: -33.913, 22.948], B. Jordal, leg., 5.xi.2006 #1, ex Olea capensis ; East Cape, Kologha Forest, W. Stutterheim [GIS: -32.535, 27.371], B. Jordal, leg., 18.xi.2006 #2, ex Olea capensis . Holotype, allotype and four paratypes deposited in SAMC, ten paratypes in ZMUB, four in NHMW.

Diagnosis. Female frons strongly concave, densely covered by short fine setae, from upper level of eyes along dorsal margin with a long protruding crest of setae; female scapus with dorsal spike, on its anterior face with long golden protruding setae as long as tarsus.

Distinguished from L. barbatus by the much shorter setae on declivity and the longer tuft of setae on the upper frons. Distinguished from L. beaveri sp. nov. by the triangular male scapus.

Description, female. Length 1.9–2.4 mm, 2.3–2.5 × as long as wide. Colour dark brown or black. Frons deeply concave between eye margins from epistoma to vertex, impressed area covered by dense short golden setae, setae longer near margins, along dorsal margin a very long and protruding mane. Antennal scapus with dorsal spike, on its anterior face with broad tuft of long setae which are longer than the tarsus; funiculus 6-segmented; antennal club with two procurved sutures, club segments lightly setose. Pronotum distinctly constricted on anterior third, anterior half with asperities which are subcontiguous near summit, separated by more than their size near anterior margin, posterior half lightly rugose, smooth towards lateral margins; vestiture consisting of short bristle-like setae, considerably longer just behind summit. Scutellum with narrow scale-like setae. Elytral interstriae with multiple confused rows of narrowly spatulate and bristle-like setae of different lengths; strial setae hair-like, recumbent, confused. Legs. Protibiae with five denticles placed in a curved row along the lateral and apical margin.

Male. Similar to female except frons much less concave, its upper margin at upper level of eyes marked by two small tubercles, impressed area densely set with equally short bristle-like setae; antennal scapus triangular, without dorsal spike, tuft of setae shorter than antennal club; anterior margin of pronotum with four densely placed teeth or granules.

Etymology. The Latin nominative adjective jubatus (iubatus) means crest or having a mane, referring to the long protruding tuft of setae on the dorsal margin of the impressed frons.

Distribution. South Africa.

Biology. A very common species breeding in twigs and branches of black ironwood ( Olea capensis ), ranging from 0.6 to 10 cm in diameter. Only occasionally the colonizing male was joined by more than one female, and in all cases the branches were in the upper size range. Females cut longitudinal egg tunnels while larvae cut transverse feeding tunnels. Broods per female ranged between 15– 30 larvae (n=7). The male was never present at the pupal stage and apparently leave at early larval stages.

Figures

FIGURES 13–22. Dorsal, lateral and frontal view of Lanurgus barbatus female (13, 16, 9), Lanurgus jubatus sp. nov. female holotype (4, 17, 20) and allotype male (21), Lanurgus pubescens male holotype (15, 18, 22).