taxonID	type	description	language	source
8D180C06FFB3786F43C3F936218F4469.taxon	description	(Figs 35 – 38)	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB3786F43C3F936218F4469.taxon	diagnosis	Diagnosis. MALE. Lateral portion of propodeum strongly striated, T 2 produced medially and reduced lamella in S 7 when compared to the other species in the group (Fig. 38). FEMALE. Unknown.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB3786F43C3F936218F4469.taxon	description	Description. MALE. Coloration. Black with the following yellow markings: clypeus; two lateral spots in intrantennal area; inner margin of compound eyes; submedian spot in gena; pronotum with subapical thin yellow bands; anterior and posterior inner margin on tegula; parategula, two submedians lateral spots on scutellum; submedian bands on metanotum; vertical thick bands on propodeum; ventral part of the midfemur and tibiae; T 1 with a subapical band projected slightly sideways. Sculpture. Parapsidal lines weakly marked on mesoscutum; axilla mesoescutelar elevated; intrantennal carina present and prominent; hypostomal and occipital carina presents and complete; mesoscutum with welts; adjacent area to tegula without punctation, appearing smooth and subtly elevated; propodeum striated in lateral view with sparse macropunctation (Fig. 38); petiole polished with macropuntate; T 2 projected apically toward the middle, exhibiting contiguous dense micropuntation for dorsal middle; subapical margin on T 2 medially angled and lamella is angled too (Fig. 37). Lamella on T 2 developed more laterally than medially and is not curved. Structure. Clypeus convex with a plain apical margin plain and weakly tridentate; metanotum with a weak tubercle which is produced medially; petiole presents a gradually elevated part; distal lamella of T 2 slightly longer medially than submedially; petiole highest after middle; T 2 projected medially; S 7 with a notch, but it is not wide and lamella is reduced (Fig. 38). Wing length 7.93 mm. Pilosity. In general, the pilosity is short and sparse, except for T 1. Genitalia. The new species exhibits a very reduced basal plate (Figs 58, 59). It presents a hump on dorsum of aedeagus, which has a straight part and ends at basal plate in a truncated shape. Ventral lobe is folded inwards with a lateral additional fold forming a ventrally projected semicircular flap. Gonostylus is sinuous and curved ventrally (Fig. 60). Gonostylus notch is practically of the same width throughout its extension. FEMALE. Unknown.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB3786F43C3F936218F4469.taxon	materials_examined	Material examined. Holotype, ♂, Bolivia, Santa Cruz de La Sierra, Jardín Botanica, 28. VIII. 1977, Porter & Stange [FSCA].	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB3786F43C3F936218F4469.taxon	distribution	Distribution. Bolivia (Santa Cruz).	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB3786F43C3F936218F4469.taxon	etymology	Etymology. The specific epithet lioneli is in memory of the third author of this study, Lionel A. Stange, who passed away in 2020.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBD786D43C3FA87210C44AC.taxon	description	(Figs 39 – 42)	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBD786D43C3FA87210C44AC.taxon	diagnosis	Diagnosis. FEMALE. Metanotum without a medium tubercle (Fig. 41). MALE. Unknown.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBD786D43C3FA87210C44AC.taxon	description	Description. FEMALE. Coloration. Black with yellow markings as follows: lateral on intrantennal carina; inner margin of compound eyes (Fig. 42); spots on gena; pronotum with subapical thin yellow bands; posterior margin on tegula; parategula; sublateral mark on scutellum; band on metanotum; propodeum; anterior and mid legs with yellowish markings on tibiae and femora; subapical band on all terga and sternites; apical band on T 1 projected laterally. Sculpture. Clypeus with macropunctation surrounded by short carinae (undoubtedly in the dorsal area) and micropunctation; the dorsal margin of clypeus is weakly emarginate showing the interantennal carina, this area without punctation; completely hypostomal and occipital carina. The interoceolar part is elevated (Fig. 40); front, vertex and gena with a strong macropunctation, again surrounding with carinae, scutum macropunctated, exhibiting a few punctations figure disruptions, likely smooth welts; inconspicuous parapsidal lines. Humeral region is slightly striated but is still noticeable yet; scutellum and metanotum macropunctated. Even in scutellum, subapical area is not punctate. Propodeum in dorsal view is diagonally striate and moderate macropunctation laterally, these are sparse on ventrally. T 1 is macropunctate; T 2 has dense micropunctation and subapical margin only has sparse macropunctations. T 2 – T 6 are micropunctate. Structure. Clypeus without teeth and has a straight margin; narrow pronotum; metanotum without a median tubercle; petiole expanding gradually in profile, with dorsum and lateral view showing a concavity. Sternite IV with moderate depression (Fig. 42). Wing length 8.73 mm. Pilosity. Following species of spinosus group, pilosity is present all over body, changing intensity in some areas. In clypeus, pilosity is short and is not dense, but laterally shows a long and very dense pilosity. Most bristles on body are short and sparse, except for following: propodeum; metanotum; T 1, which has a short, sparse, and bristling appearance; T 2 – T 6 and S 1 – S 6. MALE. Unknown.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBD786D43C3FA87210C44AC.taxon	materials_examined	Material examined. Holotype, ♀, Brazil, Rondônia, Ariquemes, 5 – 16. XI. 1996, W. J. Hanson [FSCA].	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBD786D43C3FA87210C44AC.taxon	distribution	Distribution. Brazil (Rondônia).	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBD786D43C3FA87210C44AC.taxon	etymology	Etymology. The choice of this species name refers to the absence of a median tubercle on the metanotum.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBD786D43C3FA87210C44AC.taxon	discussion	Observations. This species challenges the current delimitation for the Z. spinosus group since it does not present a median tubercle. Nevertheless, the sculpture of the clypeus along with the depression on T 6, which are unique to this species group, are also visible in Z. planinotus, ensuring its placement in this assemblage. A phylogenetic study could answer if the absence of the tubercle in this species indicates a basal placement or a derived reversion of the character.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBF786B43C3FF25235E4122.taxon	description	(Figs 43 – 45)	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBF786B43C3FF25235E4122.taxon	diagnosis	Diagnosis. FEMALE. Obsolete and very thin median tubercle on metanotum. Metanotum posteriorly flattened and a robust body, compared with other species in this group which have slender bodies (Fig. 45). MALE. Unknown.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBF786B43C3FF25235E4122.taxon	description	Description. FEMALE. Coloration. Most of the body is black and opaque except the petiole which is very shiny. With following yellow markings: intrantennal region; gena on submedian area; narrow transverse band on pronotum; tegula; parategula; marks on scutellum; submedian transverse band on metanotum; petiole with a band which extends laterally; subapical band on T 2 – T 6 and S 2 – S 6. Sculpture. Clypeus with macropunctations surrounded by short carinae and micropunctations; frons, vertex, gena, pronotum, mesoscutum and scutellum closely macropunctate. Intrantennal carina showing intersection area, which is without hypostomal and occipital carina present and complete; parapsidal lines in mesoscutum; axilla; scutellum slightly macropunctate on anterior portion and without punctures on posterior region. Propodeum strongly striate and macropuntate, in lateral view is it reticulated; T 1 is very macropunctate but without punctations posteriorly; T 2 with dense micropunctations and apical part with sparse macropunctations, same occurs in T 3 – T 5, in T 6 only micropunctations are visible. Structure. Clypeus with a concave apical margin without teeth; axillary mesoscutellar carina; tubercle on metanotum is very short, however, it is visible with a flattened form and an acute apex; petiole expanded abruptly, exhibiting highest part before middle of T 1; lamella on T 2 developed more laterally than medially and showing a subapical medial angle on T 2 and lamella too; S 6 has a subapical smooth depression. Wing length 10.79 mm. Pilosity. Bristles present throughout the body, being short and of sparse pilosity, except for: median area in clypeus and lateral margins; inner margin of compound eyes; gena; subhumeral area; tegula; parategula; in these parts pilosity is long and very dense. The bristles on T 2 form a tomentum. MALE. Unknown.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBF786B43C3FF25235E4122.taxon	materials_examined	Material examined. Holotype, ♀, Bolivia, Província del Sara, J. Steinbach [FSCA].	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBF786B43C3FF25235E4122.taxon	distribution	Distribution. Bolívia (Santa Cruz).	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFBF786B43C3FF25235E4122.taxon	etymology	Etymology. The epithet refers to the flattened metanotum.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB8786A43C3FDED223541F6.taxon	description	(Figs 46 – 51)	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB8786A43C3FDED223541F6.taxon	diagnosis	Diagnosis. MALE. T 1 in dorsal view is extremely thin; S 7 with peculiar half-moon-shaped notch (Fig. 50). FEMALE. Unknown.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB8786A43C3FDED223541F6.taxon	description	Description. MALE. Coloration. Body is matte black with a shiny petiole and following yellow markings: clypeus, two lateral small spots on interantennal carina, a spot inside ocular sinus; lateral spots on gena; posterior margin on tegula; anterior and mid legs with a longitudinal ventral part of midfemur and tibiae; small vertical submedian band on propodeum; subapical band on T 1, not extending laterally; subapical band on T 2, T 3; subapical stripes on S 2 – S 7. Sculpture. Body is strong and roughly punctate (Fig. 48). Clypeus with moderate macropunctates; frons, vertex, gena, pronotum, mesopleura, mesoscutum, scutum and metanotum with a dense macropunctation; posterolateral area of mesoscutum and anterolateral area of mesoscutelum with interspaces. Propodeum with different sculptures in some areas: on posterior part it presents strongly obliquely striae in lateral view form a crenulated lateral carina and is showing macropunctations and is lightly striate and finally, in ventral view exhibit shallow and sparse macropunctations. T 2 stem without punctation, however towards T 2 appears densely and strongly macropuntations; T 2 has micropunctation and a few sparse macropunctation; S 1 – S 7 micropunctate. Structure. Clypeus with a plain and weakly tridentate apical margin; interocellar area with a slightly elevated area adjacent to lateral ocelli forming an inverted “ Y ” depression; well-developed straight pronotal lamella. Metanotum with a median strong and acute tubercle (Fig. 51); in this case, tubercle is very prominent, so it is easily recognizable. Petiole is thin and expands abruptly, with the highest point before half length of expansion and with dorsal part flat (Fig. 49). Distal lamella of T 2 is longer medially than submedially; S 7 has a wide half-moon-shaped notch and a translucent lamella. Wing length 7.77 mm (in holotype). Pilosity. Long and sparse pilosity present all over the body, especially on the stem of T 1 and it is not tangled. Pilosity on T 2 is short and sparse, giving an opaque appearance to T 2. FEMALE. Unknown.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB8786A43C3FDED223541F6.taxon	materials_examined	Material examined. Holotype, ♂, Brazil, Acre Cruzeiro do Sul, Alvarenga, 02.63 [II. 1963] [FSCA]. Paratype, 1 ♂, Brasil, Pará, XII. 1907, Ducke [MPEG].	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB8786A43C3FDED223541F6.taxon	distribution	Distribution. Brazil (Pará, Acre)	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB8786A43C3FDED223541F6.taxon	etymology	Etymology. The suggested species name references the half-moon shape of the male notch in S 7.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB8786A43C3FDED223541F6.taxon	discussion	Observations. Both specimens examined were old and extremely fragile. While the one from MPEG was already broken. We attempted genitalia extraction from the FSCA specimen, however, it was partly broken upon removal and unviable for description.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB9786843C3FCAC2472460A.taxon	description	(Figs 52 – 57)	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB9786843C3FCAC2472460A.taxon	diagnosis	Diagnosis. FEMALE and MALE. Obsolescent metanotal tubercle is present. Petiole with expanded part is abruptly raised, and is highest well before middle of expanded part in profile. MALE. Sternite VII is broad, transverse without notch (Fig. 57).	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB9786843C3FCAC2472460A.taxon	description	Description. FEMALE. Coloration. Black and polished with yellow markings as follows: interantennal carina; inner margin of compound eyes (or ocular sinus); gena with small spots; submedian complete stripes over pronotal carina; anterior and posterior marks on tegula; parategula; discoid puncture; scutellum side view with yellow marks; transverse lateral metanotum stripes; vertical stripes on angles of propodeum; stripe on fore and mid tibiae, band on femora; subapical band on T 1 laterally projecting forward for half of petiole length; subapical bands on T 2 – T 6 and S 2 – S 5. Wings are amber. Sculpture. Generally, whole body is strongly punctuated. Dense punctation presents on clypeus, head, vertex, gena, pronotum, mesopleura, mesoscutum, scutellum, metanotum. It is interesting to point out the punctuation on metanotum forms a horizontal anterior band and other areas are unpunctate; discoid puncture present; propodeum lateral view slightly striate and macropunctares on anterolateral. Strong and dense macropunctures on T 1 and T 2 densely micropunctate, stem of T 2 present a polished band with sparse macropunctures. S 1, S 2 with sparse punctures and the others sternites show discreetly micropunctates. Structure. Convex clypeus with narrow and tridentate apex; interantennal carina present; occipital carina present; hypostomal carina present and contiguous; both in lateral and dorsal view, it is possible to see very well the developed pronotal lamella; rounded pronotum in dorsal and lateral view (Fig. 56); present pre-tegular carina; epicnemial carina present, however it is medially interrupted; mesoscutum with parapsidal lines; blunt lateral carinas on scutellum; metanotum exhibit a weak tubercle (Fig. 55); posterior face of metanotum in dorsal view flat and in lateral view visible as gradually sloping down propodeal cavity nearly flat. Petiole highest well before middle; T 2 with well-developed straight lamella, larger medially than laterally. S 6 reveals a moderate median depression. Wing length 7.93 mm. Pilosity. Body shows very short and sparse pilosity, except: laterally on clypeus with long bristles; propodeum with a long and sparse pilosity. Nevertheless, T 2 exhibits a very dense pilosity that forms tomentum and gives a rather dull appearance. MALE. Clypeal apex has a half-moon yellow mark, different from female's clypeus, and exhibits light macropunctures; intersection area on intrantennal carina is prominent and almost without punctures; it does not have a discoid puncture; there is a weak tubercle on metanotum. T 2 is striatopunctate with a developed lamella; however, it’s not same as female's. S 7 is broadly transverse, without a notch, and slightly filled with a translucent membrane. Genitalia. Basal plate of aedeagus is absent (Figs 61, 62); apodemes are curved outwards with a very large triangular apophysis; ventral lobe has a lateral fold making its tip directed inwards, and is nearly unseen laterally; head is oblong and ventrally flattened, making lateral ridges evident. Gonocoxite is wide (Fig. 63), with a bilobate apex. Gonostylus is directed posteriorly and very reduced, with a sinuosity marked as two lumps. The volsellar crest is wide. The digitus has a square flat root, with conules concentrated on apex of distal lobe, which is rounded, and basal lobe is trapezoid with a concave apex. Cuspis has a digitiform root and a large basal lobe curving behind its main body, which appears as a tall trapezoid.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB9786843C3FCAC2472460A.taxon	materials_examined	Examined material. Holotype, ♀, Argentina, Misiones, dos de Mayo, 12.89 [XII. 1889], Foerster [AMNH]. Paratype, 1 ♂, same label as in holotype [AMNH].	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB9786843C3FCAC2472460A.taxon	distribution	Distribution. Argentina (Misiones).	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
8D180C06FFB9786843C3FCAC2472460A.taxon	etymology	Etymology. The epithet refers to the almost plain metanotum and the weak tubercle.	en	Cruciol, Ana Helena, Noll, Fernando Barbosa, Stange, Lionel A., Lopes, Rogério Botion (2026): Five new species of the Zethus spinosus species group (Hymenoptera, Vespidae, Eumeninae, Zethus). Zootaxa 5748 (1): 56-72, DOI: 10.11646/zootaxa.5748.1.2, URL: https://doi.org/10.11646/zootaxa.5748.1.2
