Salcedia lukulua, Balkenohl, 2020

Balkenohl, Michael, 2020, A genus in disguise. Revision of the genus Salcedia Fairmaire, 1899 with descriptions of nine new species (Coleoptera, Carabidae, Scaritinae, Salcediini), ZooKeys 901, pp. 1-81 : 1

publication ID	https://dx.doi.org/10.3897/zookeys.901.39432
persistent identifier	https://treatment.plazi.org/id/E32A2623-2DE7-59B0-8FA3-D4C69DFCF1B7
treatment provided by	ZooKeys by Pensoft
scientific name	Salcedia lukulua
status	sp. nov.

Treatment

Salcedia lukulua sp. nov. Figs 4 View Figures 3, 4 , 5 View Figure 5 , 21 View Figures 20–25 , 39 View Figures 36–43 , 80 View Figures 77–83 , 84 View Figure 84

Type material.

Holotype: ♀, with labels and data: white, black printed, "I.R.S.A.C.-MUS. CONGO Katanga: Galerie forest, de la Lukulu, terr. Manono X-1958" / "Mission Z. Bacq N. Leleup" (MRACT). Paratype: 1 ♀, same data as holotype (CBB).

Remark.

In the paratype two terminal antennomeres of the left antennae are missing.

Diagnosis.

A small sized species, with elongate oval outline of the elytra with maximum width at middle and the pronotum with three additional carinae with the inner lateral carina isolated. The pseudohumerus is obtuse angled and not dentate. The antennomeres are sub-elongate. Distinguished most clearly from the similar species S. perrieri by the distinctly convex outline of the elytra without tooth at the pseudohumerus, and the pronotum with the posterior lateral part of the base distinctly wing-like produced posteriorly with distinct notch between wing and central part of base, slightly emarginated posteriorly.

Description.

Measurements in Table 1 View Table 1 .

Colour and surface: Piceous to slightly fuscous, shiny, top of carinae on head, pronotum and elytra opaque; mandibles, antennae, palpi and legs fuscous, antennae with scapus piceous.

Head (Fig. 5 View Figure 5 ): Three-quarters of pronotum width. Outline campanulate. Clypeus wide, straight anteriorly, separated from convex clypeal wings by indistinct obtuse notches, clypeal wings separated from supra-antennal plates by distinct notches, with raised oval field at middle, separated from frons by deep transverse furrow. Frons with two raised paramedian carinae, joining V-like anteriorly with minute tubercle, with two small obtuse teeth bilaterally anterior to central carinae, with two parallel carinae paralaterally near base; frons and clypeus separated from supra-antennal and supraorbital plates by deep broad furrows, each furrow with deep circular pit between supra-antennal plate and clypeus; supra-antennal and supraorbital plates distinctly margined, margin raised, carina-like, smooth, supra-antennal plates vaulted. Base distinctly emarginated bilaterally towards middle, obtuse angled laterally (angle 137°). Eyes convex, genae moderately convex, both of them partly visible from above, with triangle-like shape in lateral view, posteriorly emarginated. Antenna with segments five to ten sub-elongate (L/W 1.16), densely pubescent, segments two to four scarcely pubescent, scapus with longitudinal reticulation. Labrum obtuse angled anteriorly. Mandible moderately short, wide, slightly arcuate at apex. Mentum small, nearly circular, epilobes wide, projecting, nearly right-angled anteriorly, completely margined, surface with regular pits.

Pronotum (Fig. 39 View Figures 36–43 ): Outline rectangular, transverse, a third wider than long. Lateral margin convex, maximum width at end of second third, crenulated, more distinct posteriorly, with 12 (-13) tubercles, with distinct emargination at posterior angles. Base posteriorly wing-like produced, with distinct notch between wing and central part of base, slightly emarginated posteriorly, flat keel at middle broad, indistinct. Disc flattened (lateral view), with two raised paramedian carinae parallel to median line and slightly diverging posteriorly, with median line small, long, ending in pits anteriorly and posteriorly, with three additional shorter carinae bilaterally, the paralateral ones joining with the paramedian carinae at base and forming tooth-like tubercles pointing posteriorly, extended anteriorly as less raised paralateral carinae. With well-developed outer lateral carinae, with isolated short and less raised inner lateral carinae. All carinae sub-crenulate. Lateral margin and space between lateral margin and paralateral carina wing-like bent up, with six large transverse pits, each pit consisting of two deep circular and connected pits.

Elytron: Flattened in anterior two thirds (lateral view), convex in frontal view. Elongate, margin long-convex, maximum width at middle. Pseudohumerus appearing nearly rectangular but is obtuse (angle 108°), not dentate. Apex rounded, with small acute tooth at suture. Disc with interneur six sub-crenulate, more distinct apically, interneur two running up to apex as slightly convex line, distinctly raised, conspicuously raised at base; interneur four running in parallel to interneur six, not reaching base, distinctly shortened at apex. Interneur five and six with two rows of serial pits, the latter ones distinctly merged transversally.

Hind wings: Fully developed.

Lower surface: Antennal channel of pronotum with isodiametric reticulation. Pseudoepipleura with two rows of pits, lateral pits larger; lateral margin of elytron smooth. Metasternum with numerous irregularly situated larger and smaller pits, last five abdominal sternites with small pits and irregular reticulation, four to six distinctly sulcate, last visible sternum with longitudinal carina at middle and three flat oval impressions apically.

Legs: Profemora indistinctly reticulated. Protibia laterally with three larger teeth and with a smaller one basally, dorsally with one and ventrally with two carinae. Metafemora with transverse flat rugae at ventral surface.

External sexual dimorphism: Not observed.

Male genitalia: Unknown.

Female genitalia (Fig. 80 View Figures 77–83 ): Coxostylus broad at base, distinctly curved, moderately broad in apical third, at end of basal third with one shorter strong and five slender nematiform setae laterally, with one long slender nematiform seta ventrally, SSO with two microtrichia.

Variation: The slight separation of the clypeus from the clypeal wings is more distinct in the paratype.

Etymology.

The name refers to the river Lukulu where the two specimens were found.

Distribution.

(Fig. 84 View Figure 84 ). Known from the type locality at the River Lukulu (gallery forest) in Katanga, south-east of the Democratic Republic of the Congo.