Carinostigmus triangularis Bashir & Ma, 2021

Bashir, Nawaz Haider, Li, Qiang & Ma, Li, 2021, Four new species of the genus Carinostigmus Tsuneki (Hymenoptera, Apoidea, Crabronidae) from Oriental China, with an updated key to the Chinese species, Journal of Hymenoptera Research 81, pp. 87-107 : 87

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Carinostigmus triangularis Bashir & Ma

sp. nov.

Carinostigmus triangularis Bashir & Ma sp. nov.

Figs 5 View Figure 5 , 6F View Figure 6

Type material.

Holotype: ♀, China: Yunnan: Jinghong: Menghai: Bulang Mountain, 21°56'N, 100°26'E, 20.VI.2018-20.VII.2018, No. 2019000381, coll. Malaise trap (YNAU); Paratypes: 3♀, same locality as holotype, No. 2019000378, 17.V.2018-20.VI.2018, No. 2019000151, 25.IV.2018-17.V.2018, No. 20190329.


Differs from Chinese species of Carinostigmus by the following features: flagellomeres I-II fulvous; legs largely black; labrum distinctly constricted subapically; free margin of clypeus slightly turnup apically; inter-antennal tubercle longer than midocellus diameter, slightly broadened at apex; lower gena rugose; pronotal collar with transverse striations medially; metanotum with striations medially; petiole dorsal carinate basally and medially; pygidial area elongate. The new species resembles C. costatus Krombein 1984, but can be distinguished it by the following characters (characters of C. costatus in brackets): labrum distinctly triangular, broader than C. costatus (labrum pentagonal, narrower than new species); clypeus moderately convex (clypeus slightly convex); median and lower frons with transverse, irregular rugae medially and laterally (median and lower frons without rugae); inter-antennal tubercle longer than midocellus diameter, without T-shape projection (inter-antennal tubercle shorter than midocellus diameter, with T-shape projection); upper frons longitudinal carina without groove before anterior ocellus (upper frons with a weak groove before anterior ocellus); vertex behind ocelli impunctate (vertex behind ocelli punctate); lower gena with dense rugae near midventral line (lower gena without rugae near midventral line); pronotal collar lateral angles projected (pronotal collar lateral angles blunt); notaulus shallowly grooved, extending to one third of scutum length (notaulus deeply grooved, extending to half of scutum length); parapsidal line distinct (parapsidal line weakly impressed); metanotum with transverse striations medially (metanotum without striations medially); propodeal enclosure without triangular impression (propodeal enclosure with triangular impression); propodeum laterally with densely rugose (propodeum laterally sparsely rugose); petiole sub quadrate dorsally (petiole cylindrical) and pygidial area very elongate (pygidial area not elongate as new species).


Female (Figs 5 View Figure 5 , 6F View Figure 6 ): length of body 5.5 [5.2-5.7] mm.


Body black and shiny, except for the following: mandible ivory to fulvous (black basally and apically); labrum ivory with dark brown sides; palpi, scape, pedicel and flagellomeres I-II (remainder dark brown) fulvous; pronotal lobe white; tegula and forewing veins dark brown; legs black (fore tibia, fore and mid tarsus fulvous, mid tibia and hind tarsus reddish brown); setae on margin of clypeus and mandible yellowish.

Head (Fig. 5A-D View Figure 5 ). Mandible tridentate apically; setae on mandible sparse and long; labrum triangular, round at apex, distinctly constricted subapically; clypeus moderately convex, with sparse, coarse punctures; setae on margin of clypeus sparse and long; free margin of clypeus truncate medially, slightly turnup apically (Fig. 5A View Figure 5 ); median and lower frons distinctly coriaceous, with transverse, irregular rugae medially and laterally, and with a sturdy frontal median longitudinal carina; inter-antennal tubercle longer than midocellus diameter, slightly broadened at apex; upper frons with sparse, fine punctures, longitudinal carina distinct anteriorly, not reaching anterior ocellus (Fig. 5A View Figure 5 ); ocellar triangle nearly flat, half mat, with fine, sparse punctures; vertex behind ocelli half mat, nearly impunctate (Fig. 5B View Figure 5 ); gena with several, sturdy, oblique, transverse rugae medially (Fig. 5D View Figure 5 ); lower gena with dense, sturdy, regular rugae (Fig. 5C View Figure 5 ); occipital carina narrow, inconspicuously foveolate (Fig. 5B View Figure 5 ); inner orbital furrow narrow, with inner marginal carina distinct, inconspicuously foveolate (Fig. 5A View Figure 5 ); outer orbital furrow narrow, hind marginal carina distinct, inconspicuously foveolate (Fig. 5D View Figure 5 ); length of scape: length of pedicel: length of flagellomere I: width of flagellomere I = 23: 7: 7: 4; maximum head width, dorsally: distance from upper margin of the frons to occipital carina in middle: distance from vertex to clypeal margin in middle = 75: 48: 56; maximum eye length, laterally: maximum eye width, laterally: maximum eye width, frontal view = 47: 21: 18; inner-orbital width, medially: outer-orbital width, medially: occipital carina width, dorsally = 3: 2: 1; maximum width of gena, laterally: distance between antennal sockets, frontal view = 28: 14; distance between inner margins of hind ocelli: distance between outer margin of hind ocellus and nearest inner eye margin: distance between posterior margin of hind ocellus and occipital carina, dorsally = 7: 14: 24.

Mesosoma (Fig. 5E, H, I View Figure 5 ). Pronotal collar strongly elevated medially, with transverse striations medially, anterior pronotal ridge strong, lateral angles sharp and projected (Fig. 5E View Figure 5 ); width of collar in middle: length of collar in middle = 11: 36; mesoscutum with coarse punctures, sparsely distributed, posterior area with dense, strong parallel ridges; admedian line weakly impressed, extending to anterior ¼ of scutum length; notaulus shallowly grooved and foveolate, extending to one third of scutum length; parapsidal line distinct; scutellum with coarse, sparse punctures; metanotum with sparse, sturdy longitudinal rugae laterally, and dense transverse striations medially (Fig. 5E View Figure 5 ); mesopleuron with fine, sparsed punctures, hypoepimeral area with dense, irregular weak striations, posterior area with contiguous, long rugae; omaulus broadened, 1.2 × pedicel length; hypersternaulus broadened anteriorly, 1.3 × pedicel length, narrow apically, 0.5 × pedicel length, distinctly foveolate; scrobal suture long, complete (Fig. 5H View Figure 5 ); propodeal enclosure deeply impressed, sub triangular, with sturdy, longitudinal rugae anteriorly, reticulate medially; propodeum posterior with sturdy, irregular reticulation (Fig. 5I View Figure 5 ); propodeum laterally with sparse, sturdy, oblique, longitudinal rugae anteriorly, and irregular reticulation posteriorly (Fig. 5H View Figure 5 ).

Metasoma (Fig. 5F, G, J, K View Figure 5 ). Petiole dorsal sub quadrate (not cylindrical), carinate basally and medially, basal width of petiole narrower to its apical width (Fig. 5F View Figure 5 ), petiole laterally with few weak carinae (Fig. 5G View Figure 5 ); maximum width of petiole, dorsally: length of petiole, laterally: maximum length of metasomal tergum I, dorsally: maximum width of metasomal tergum I, dorsally = 8: 54: 24: 30; metasoma half mat, with fine, sparse punctures (Fig. 5J View Figure 5 ); pygidial area smooth, very elongate, 1.8 × pedicel length (Fig. 5K View Figure 5 ).

Male. Unknown


China (Yunnan).


The name, Carinostigmus triangularis , is derived from the Latin word triangulus (= triangle), referring to the triangular shape of the labrum.