Syngenes medialis, Mansell, 2018

Mansell, Mervyn W., 2018, Antlions of southern Africa: Syngenes Kolbe, 1897, with descriptions of two new species and comments on extra-limital taxa (Neuroptera: Myrmeleontidae: Acanthaclisini), Zootaxa 4497 (3), pp. 346-380 : 355-362

publication ID

https://doi.org/10.11646/zootaxa.4497.3.2

publication LSID

lsid:zoobank.org:pub:F847993D-11E7-41A9-8E57-08C64450D1A3

DOI

https://doi.org/10.5281/zenodo.5997076

persistent identifier

https://treatment.plazi.org/id/43176C01-313A-FF94-EAA2-FA1257E3FED6

treatment provided by

Plazi

scientific name

Syngenes medialis
status

sp. nov.

Syngenes medialis sp. nov.

Figs 25–43 View FIGURES 25–26 View FIGURES 27–30 View FIGURES 31–33 View FIGURES 34–37 View FIGURES 38–40 View FIGURES 41–43 , 68 View FIGURES 66–68 , 70 View FIGURES 69–71 , 72 View FIGURE 72 .

Etymology. Derived from its geographic distribution between the populations of S. scholtzi n. sp. in the west and S. longicornis in the east of southern Africa and in the middle of the distribution of Syngenes species extending from West Africa to Madagascar.

Description. Based on holotype male, 14 male and 61 female paratypes.

Diagnosis. Distinguished from other Syngenes species by the absence of biaereolate cells in the costal area before Rs and usually beyond Rs2 ( Figs 27 View FIGURES 27–30 , 70 View FIGURES 69–71 ). Wings broad, variously marked, sometimes with distinct large spots at hind margin of forewing. Abdomen banded, no chevron pattern. Tibial spurs in forelegs slender, strongly bent but not right-angular with very narrow flange, not expanding apically as in S. longicornis , hind tibial spurs evenly curved, without flange, TA 1–4 uniformly black, T5 pale. Labial palp with short slit-shaped palpimacula ( Fig. 41 View FIGURES 41–43 ).

Head: wider than prothorax, vertex slightly raised, rounded. Frons and vertex black with short white recumbent setae; three large laterally-elongated embossed yellow marks present on upper frons, vertex with small irregular yellow spots, occiput with three distinct embossed orange patches. Face below antennae, clypeus, genae and labrum uniformly yellow, with long, sparse, pale setae. Antennae long, clavate, longer than twice head width, toruli less than scape diameter apart, scape almost touching eyes, scape and pedicel uniformly yellow, with sparse long white setae, flagellomeres short, annulated with black and yellow, covered in short black setae. Eyes large, greater than hemispherical, sparse ocular setae usually present. Maxillary and labial palps short, much less than head width, yellow, terminal labial palpomere spindle shaped with long acute apex, palpimacula short, slit shaped ( Fig. 41 View FIGURES 41–43 ).

Thorax: yellow with black markings, sparsely pilose. Prothorax slightly longer than wide, tapering anteriorly, lateral margins with two curved black streaks that merge anteriorly and posteriorly, central pronotum with single streak at anterior margin and two short parallel streaks posteriorly, with distinct black dots at setal bases. Sparse long white and black forwardly curved setae present laterally, short black bristles along anterior raised margin, posterior margin with long curved black setae. Mesothorax: mesoprescutum yellowish-brown, black anteriorly and laterally, with two yellow spots laterally, anterior margin with long curved black setae; mesoscutum yellowishbrown with three diffuse longitudinal black lines on either side above wing bases, with sparse black setae; mesoscutellum yellowish-brown with two curved black marks centrally, anterior and lateral margins narrowly black. Metathorax: metaprescutum black with pale midline, metanotum yellow with black V-shaped mark centrally, a black streak present laterally above wing bases, velvety spots not discernible, long curved white setae present laterally; metascutum black with three yellow spots, one centrally, two laterally. Pleurites below wings yellow with black streaks, sternites yellow, dense long white setae present on pleurites and sternites.

Wings: broad, forewings longer, broader than hind wings, apices sub-acute, forewings more rounded than hind wings, membrane largely hyaline, veins with alternating sections of yellow and black, bearing very short sparse black and yellow setae on correspondingly coloured areas. Forewings broad with slightly undulating posterior margin, a distinct curved mark present in distal third, frequently with one or two large spots at posterior margins (22 of 75 specimens). Axillary protuberance at base of forewing dark yellow with long dense white and black setae. Costal vein alternating yellow and black with tuft of short black bristles at base, costal area narrow at base, broadening then narrowing slightly towards pterostigma Proximal costal area veins bifurcate but mainly unbranched, with no biaereolate cells; cells only becoming irregularly biareolate beyond Rs and usually beyond Rs2 ( Fig. 27 View FIGURES 27–30 ). Pterostigma white. Apical margin of wing with densely arranged narrowly forked veins. Hypostigmatic cell elongate. Sc, R and proximal region of CuA with yellow and black chevron-like pattern. Membrane between Sc and R heavily marked with alternating yellow and black bands. Rs arises well beyond CuA fork, with Rs2 at or just beyond first fork of Rs, 8–10 presectoral veins present. Mp2 (oblique vein) arising beyond CuA fork, CuP arises at basal crossvein, bifurcating after short free base with upper branch linking with CuA and lower uniting with A1, A2 not parallel to A1, evenly curved. Membrane at posterior base with long soft white setae. Hind wings narrower than forewings, lanceolate, with faint marks usually discernible in distal half, axillary protuberance at base yellow with long dense white setae, C yellow and black, costal area uniareolate, veins unbranched until pterostigma, costal area narrow at base expanding into a bulge then narrowing and parallel to Sc. Pterostigma white, hardly discernible. Hypostigmatic cell long. Usually 5–6, presectoral crossveins, Rs arises beyond Mp2 fork, Cu fused with posterior branch of Mp2 fork, anterior banksian line visible in distal portion of wing. Pilula axillaris in males conspicuous, bearing densely packed short brown recumbent setae. Females with long white setae in this position.

Legs: forelegs strongly developed with short stout spines. Coxa, trochanter yellow with long white pubescence.

Femur yellow with diffuse brown marks dorsally, very stout, thickened at base tapering distally, two femoral sense hairs present near base, ventral surface with two rows of strong short black bristles accommodating the tibia on closure, long white setae occur laterally. Tibia slender, yellow with four black stripes at femoral articulation and two black annulations proximally; lateral surfaces with long white setae, black setae dorsally, with densely arranged short black setae ventrally that fit between two rows of black bristles on femur. A dense facial brush of short golden pubescence present on interior and ventral apical surfaces. Tibial spurs ( Figs 28, 29 View FIGURES 27–30 ) slender, strongly bent but not right-angular with slightly raised flange. Tarsus with Ta5 longer than Ta1–Ta4 combined, Ta1–Ta4 shiny black, covered in short black bristles, Ta5 long, yellow, black apically, covered with short black bristles, preapical claws dark reddish-brown, stout, strongly curved. Middle legs shorter, more slender than forelegs, entirely yellow. Coxa, trochanter shorter than in foreleg, yellow with long white pubescence. Femur yellow with one sensory seta proximally, two rows of black bristles ventrally as in foreleg, covered with long white setae and sparse patch of long black bristles dorso-apically. Tibia, tarsus as in forelegs, but spurs more evenly curved lacking raised flange. Hind legs long slender, yellow, lacking femoral sense hair. Coxa, trochanter as in middle leg. Femur with faint black diffuse black stripe laterally, dorsal surface with short black setae, laterally with long black curved setae, long white setae proximally, ventral surface with two rows of short black bristles, tibia yellow, slender with short coarse black setae, tibial spurs slender, gently curved.

Abdomen: yellow with medially divided black bands at distal half of each segment ( Fig. 30 View FIGURES 27–30 ), tergites with sparse short black setae, sternites yellow with sparse short white setae but sternites 1–2 with long soft dense white pubescence, sternite 8 black proximally, sternite 9 black. Males with black hair pencils between segments 6 and 7 ( Fig. 32 View FIGURES 31–33 ). Male ( Figs 31–37 View FIGURES 31–33 View FIGURES 34–37 ): T9 yellow divided dorsally; S9 black, short, rounded with pale central stripe and long black posteriorly directed setae ( Fig. 33 View FIGURES 31–33 ). Ectoprocts yellow with long postventral lobe, dorsal margin with black stripe ( Figs 31, 32 View FIGURES 31–33 ), postventral lobes with long anteriorly curved white and black setae becoming longer posteriorly ( Figs 31–33 View FIGURES 31–33 ). Gonarcus ( Figs 34–37 View FIGURES 34–37 bears a prominent beak-shaped Mu; Pa ( Figs 34–37 View FIGURES 34–37 ) sclerotized, articulating with Gs, terminating in upwardly curved sharply pointed extremities. Female ( Figs 38–40 View FIGURES 38–40 , 42 View FIGURES 41–43 ): T9 divided dorsally, Ga digitiform with long pale setae; Gl clavate bearing very long stout, slightly curved brown spines, Epr rounded, bearing slender, slightly curved setae. Spermatheca ( Fig. 42 View FIGURES 41–43 ) very long relative to other taxa, sclerotized, broad proximally becoming slender, with long convoluted, coiled distal portions bearing fine setae along distal extremity.

Larva. Very similar to that of S. longicornis , being white with the characteristic black markings. Unfortunately, the four specimens received in the larval stage pupated before photographs or measurements could be obtained. They were collected in the sand of a dry riverbed.

Distribution ( Fig. 72 View FIGURE 72 ). This species is widespread in the eastern and northern provinces of South Africa: Limpopo, Mpumalanga, KwaZulu-Natal, extending south to the Eastern Cape. Also northwards into Botswana, Mozambique, Zimbabwe, northern Namibia, Malawi, Congo and Tanzania.

Comments. Syngenes medialis resembles both S. inquinatus from West Africa and S. maritimus from Aldabra Island and Madagascar, and it was uncertain as to which of these two taxa this common and widespread species should be assigned. Examination of 76 specimens, extending over a wide area from Brazzaville ( Congo) to South Africa has however, revealed a consistent feature in which the costal veins of S. medialis are either simple or forked, without any biaereolate cells before the origin of Rs, and usually also beyond Rs2. By contrast, S. inquinatus and S. maritimus have a variable number of crossveins before Rs and biaereolate cells after Rs before Rs2. It was consequently decided to allocate separate specific status to avoid an incorrect association with either. It is clear that these three morphologically similar taxa constitute a species complex, with S. inquinatus occurring in West Africa, S.maritimus inhabiting Madagascar and Aldabra Island while S. medialis occupies a large area in between, in southern, eastern and central Africa. A specimen in MRAC labeled as Cotype of S. dolichocercus by Navás (1925) is S. medialis .

Type material examined. SOUTH AFRICA , Limpopo Province: Holotype ♂, Makhutsi Camp, Lekgalameetse Nature Reserve, 24°11’57”S 30°20’22”E, 1200m, 9.i.1997, hand-netted, M.W.Mansell, NEUR09562 GoogleMaps . Paratypes: 2♂ 3♀, same data as holotype GoogleMaps ; 1♀, Nylstroom , 24°42’S 28°20’E, 15.iii.1978, S.J.van Tonder, NEUR11818 GoogleMaps ; 1♀, 10 km N Wyllies Poort , 22°53’S 29°52’E, 30.xii.1978, L.R.Minter, NEUR09075 GoogleMaps ; 1♂ 1♀, Mogol Nature Reserve , 23°58’S 27°45’E, 20.i.1983, M.W.Mansell, NEUR00118 GoogleMaps ; 1♀, D’Nyala Nature Reserve , 23°45’03”S 27°49’32”E, 893m, 8.xii.1989, M.W.Mansell, H.&U.Aspöck, NEUR01314 GoogleMaps ; 1♀, same locality, 13.i.1991, E.Grobbelaar, NEUR10482 GoogleMaps ; 1♀, Lapalala Nature Reserve School , 23°54’06”S 28°17’31”E, 1158m, 18.ii.1994, R.G.Oberprieler, NEUR11868 GoogleMaps ; 1♀, Natuurpraal Resort, Melkrivier, 24°00’S 28°25’E, 1100m, 20.ii.1995, M.W.Mansell, H.&U.Aspöck, NEUR02038; 1 ♀, Messina , 22°19’41”S 30°01’37”E, 525m, 22.xi.1996, C.Peyper, NEUR10178 GoogleMaps ; 1♀, Ben Lavin Nature Reserve , 23°09’S 29°57’E, 19.i.1998, M.D.Picker, NEUR09583 GoogleMaps ; 1♀, Alldays , 22°40’S 29°06’E, 8.iii.2000, R.D.Stephen, NEUR05580 GoogleMaps ; 1♀, Mapungubwe , 22°12’09”S 29°21’50”E, 518m, 22.xii.2009, No collector name, NEUR11867 GoogleMaps ; 1 ♂, Dongola Ranch , 22°13’57”S 29° 41’19”E, 630m, 23.xii.2009, No collector name, NEUR11866 GoogleMaps ; 1♀, Northwich Game Farm , 22°53’21”S 29°52’25”E, 836m, 19.i.2014, D.K.Bakkes, NEUR11922 GoogleMaps ; 1♀, Bievack 14 Farm , 22°28’20”S 28°55’14”E, 636m, 22.iii.2014, D.Kamffer, NEUR11900 GoogleMaps ; 1♀, Zuurfontein Farm , 23°48’29”S 27°46’27”E, 835m, 28.iii.2014, N.J.Parry, NEUR11885 GoogleMaps ; 1♂, Gnu Ranch , 24°01’44”S 27°29’13”E, 998m, 19.iv.2014, R.W.Mansell, NEUR11878 GoogleMaps . Mpumalanga Province: 1♀, Louws Creek , 25°37’S 31°16’E, 15.iii.1920, A.Rob, TMSA00889 View Materials , ( TMSA) GoogleMaps ; 1♂ 3♀, Ngweti River , 25°31’S 31°42’E, 8.xi.2001, G.Nelson, NEUR05752 GoogleMaps .

KwaZulu-Natal: 1♀, Lake Sibaya , 27°22’04”S 32°42’56”E, 50m, 15.xii.1968, J.L.Minshull, NEUR11854 GoogleMaps ; 1♀, Empangeni , 28°44’S 31°53’E, 22.xi.1989, P.E.Reavell, NEUR11901 GoogleMaps .

Eastern Cape Province: 1♀, Kei Bridge, 32°30’23”S 27°58’45”E, 3.iv.1990, N.J.Duke, NEUR11832 . Kruger National Park GoogleMaps : 1♀, Satara Camp, 24°23’40”S 31°46’40”E, 269m, 1.iii.1968, A.C.Kemp, NEUR11852; 1♀, same locality and collector, 9.ii.1969, NEUR11851 GoogleMaps ; 1♀, same locality and collector, 15.ii.1969, NEUR11850 GoogleMaps ; 1♀, same locality and collector, 11.iii.1969, NEUR11849 GoogleMaps ; 1♀, same locality, 26.iv.1969, J.H.Potgieter, A.Strydom, TMSA00890 View Materials ( TMSA) GoogleMaps ; 1♀, same locality, 1.ii.1987, A.J.van Rensburg, NEUR11872 GoogleMaps ; 1♀, same locality, 5.ii.1988, M.D.Picker, NEUR11831 GoogleMaps ; 1♀, Crocodile Bridge, 25°21’S 31°54’E, 12.iv.1969, A.Braack, NEUR11848; 1♀, Skukuza, 24°59’41”S 31°36’49”E, 17.xii. 1970, 300m, A.Braack, NEUR11846; 1♀, same locality and collector, 7.i.1972, NEUR11855 GoogleMaps ; 1♀, same locality and collector, 9.iii.1972, NEUR11856 GoogleMaps ; 1♀, same locality, 14.i.1985, M.W.Mansell, NEUR11817 GoogleMaps ; 1♀, same locality, 4.iv.1990, L.E.O.Braack, NEUR05636 GoogleMaps ; 1♀, same locality, 26.xi.1993, M.Krüger, TMSA00891 View Materials ( TMSA) GoogleMaps ; 1♀, same locality, 7.iv.1999, H.Stapelberg, NEUR11871 GoogleMaps ; 5♂ 3♀, Sabi-Sand Rivers Junction, 24°57’28”S 31°42’30”E, 238m, 20.i.1984, hand-netted, M.W.Mansell, NEUR00409; 1♀, Shirombe Pan, 22°44’S 31°24’E, 19.xii.1970, A.&H.Braack, NEUR11859; 1♀, Pumbe Picket, 22°37’S 31°16’E, 7.iv.1972, A.Braack, NEUR11857; 1♀, Pafuri, 22°25’52”S 31°12’45”E, 216m, 20.xi.1973, J.van Reenen, TMSA00888 (TMSA); 1♀, same locality, 15.i.1982, R.M.Miller, NEUR11838 GoogleMaps ; 1♂, same locality, 27.xii.1983, L.E.O.Braack, NEUR00320 GoogleMaps ; 1♀, same locality and collector, 25.iv.1984, NEUR00327 GoogleMaps ; 1♀, Nyandu Sandveld, 22°39’S 31°21’E, 25.xi.1973, A.&H. Braack, NEUR11845; 1♀, Bobomene, 22°25’45”S 31°12’31”E, 124m, 17.iii.1974, A.Braack, NEUR11847; 1♀, same locality, 29.i.1984, M.W.Mansell, NEUR00267 GoogleMaps ; 1♀, Magaludzo, 22°30’45”S 31°05’09”E, 317m, 25.xi.1969, A.Braack, NEUR11858; 1♀, same locality, 1.i.1970, A.&H.Braack, NEUR11844 GoogleMaps ; 1♀, Tambotie Camp, 24°27’16”S 31°24’21”E, 426m, 20.iv.2017, H. de Klerk, NEUR12444.

BOTSWANA: 1♀, Chobe Safari Lodge , 17°48’21”S 25°08’46”E, 940m, 1.iv.1988, A.Kvist, NEUR11843 GoogleMaps ; 1♂ 1♀, Moremi Gorge , 22°37’S 27°26’E, 23.xii.2000, A.J.Gardiner, NEUR08976 GoogleMaps .

CONGO: 1♀, Brazzaville , 04°16’S 15°17’E, 15.iii.1965, L.Detaille, NEUR11903 . GoogleMaps

NAMIBIA: 1♀, Buffalo Camp , 18°07’06”S 21°40’43”E, 29.ii.1992, R.G.Oberprieler, NEUR11819 GoogleMaps ; 1♂, Katima Mulilo , 17°30’13”S 24°16’30”E, 950m, 20.xii.2002, H.Bodenstein, NEUR06068 GoogleMaps .

TANZANIA: 1♀, Moba , 07°02’22”S 29°45’58”E, 782m, 15.iv.1954, H.Bomans, NEUR11902 . GoogleMaps

ZIMBABWE: 1♀, Kariba Campsite , 16°31’S 28°50’E, 27.xii.1975, M.W.Mansell, NEUR11853 GoogleMaps ; 1♀, Tashinga Camp , 16°48’48”S 28°26’26”E, 8.iv.1988, A.J.Gardiner, NEUR01298 GoogleMaps ; 1♀, Matsheumhlope , Bulawayo, 20°10’S 28°43’E, 11.ii.2000, A.J.Gardiner, NEUR05775 GoogleMaps . (All in SANC except where otherwise indicated).

MRAC

Mus�e Royal de l�Afrique Centrale

TMSA

Transvaal Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Neuroptera

Family

Myrmeleontidae

Genus

Syngenes