A new species of Cretevania Rasnitsyn, 1975 (Hymenoptera: Evaniidae) from the mid-Cretaceous Kachin amber Author ROSSE-GUILLEVIC, SIMON Author JOUAULT, CORENTIN text Palaeoentomology 2023 2023-06-14 6 3 242 249 http://dx.doi.org/10.11646/palaeoentomology.6.3.6 journal article 10.11646/palaeoentomology.6.3.6 2624-2834 8073076 63C918C3-778D-4D90-AA27-562D8F9A2902 Cretevania kachinensis sp. nov. ( Figs 1–3 ) urn:lsid:zoobank.org:act: 3C7621BE-F2E1-4F5C-8A47- E53C3746 CAD 8 Material. Holotype IGR .BU-075 (in an amber piece measuring 11 × 6 × 1 mm , with a few stellate hairs and a Thysanoptera), deposited in the amber collection of the Geological Department and Museum of the University of Rennes , France ( IGR ). Etymology. The species name refers to the state of the type locality of the amber piece. Diagnosis. Antennae with 10 flagellomeres; scape shorter than head length; pedicel very short, about as long as wide. Forewing with pterostigma elongate, longer than 2r-rs; pterostigma base basad of 2Rs middle; vein 1Rs about 0.25× as long as 1M and subvertical to R; 1+2r cell 1.4× as long as 3r cell; 2r-rs 2.25× as long as pterostigma width; 2Rs slightly longer than 3Rs; 1m-cu anteriad of 2Rs+M fork, angle between 1m-cu and 2Cu ca . 110°; 1mcu cell about 1.6× as long as wide; 2rm cell triangular, ca . 1.8× as long as 1mcu cell; 2r-m spectral (outlined by the absence of microtrichia); 1cu-a distinctly postfurcal; 2cua cell rectangular (1cu-a and 2cu-a complete, and A slightly overpassing 2cu-a); 2cu-a straight; 2m-cu absent; A not fused with 2cu-a. Locality and horizon. Noije Bum Hill, Hukawng Valley, Kachin State , Myanmar ; upper Albian to lower Cenomanian, mid-Cretaceous. Description. Male. Body mostly black (complicating the observation of mesosomal structures). Total length ca . 3.2 mm . Head ca . 0.38 mm long, 0.5 mm high (0.76× as long as high), covered with minute erected setae. Eyes kidneyshaped ca . 0.15 mm long, ca . 0.22 mm high (0.68× as long as high). Antennae with 12 antennomeres, ca . 1.12 mm long and ca . 0.05 mm wide; scape short and thick, shorter than head length; pedicel very short, about as long as wide; flagellomeres cylindrical, distinctly longer than wide, gradually and slightly thickening and shortening towards apex, except apical one (flagellomere I ca . 0.11 mm long, penultimate 0.07 mm long, and apical one 0.12 mm long); distal flagellomere acuminate. Clypeus short and lenticular, with a sigmoidal profile. Mandibles robust, bases apparently broader than clypeus length. Maxillary palpus with at least four palpomeres, length of measurable part 0.23 mm , apical palpomere acuminate. Labial palpus not visible. FIGURE 1. Cretevania kachinensis sp. nov. , holotype IGR.BU-075. A , Habitus in left lateral view. B , Habitus in right lateral view. Scale bars = 500 µm ( A ) and 750 µm ( B ). Mesosoma 0.98 mm long, 0.5 mm high covered with minute erected setae; long, white and erected setae present ventrolaterally (on mesopleuron and propleuron). Mesopleuron with anepisternum and katepisternum delineated by a conspicuous carina. Propodeum and metapleuron areolate-rugose. Mid and hind legs close together, distinctly separated from forelegs (distance between fore and mid coxae 0.04 mm ). Forelegs: coxa 0.24 mm long, 0.1 mm wide; trochanter 0.16 mm long, 0.08 mm wide; femur 0.38 mm long, 0.06 mm wide; tibia setulose 0.5 mm long, 0.03 mm wide; tarsus 0.48 mm , 0.03 mm wide, basitarsomere slightly shorter than remaining tarsomeres lengths combined, all others subequal in length. Mid-legs: coxa 0.37 mm long, 0.04 mm wide; trochanter 0.23 mm long, 0.04 mm wide; femur 0.53 mm long, 0.07 mm wide; tibia setulose 0.52 mm long, 0.04 mm wide; tarsus 0.51 mm long, 0.03 mm wide, basitarsomere about same length as tarsomeres II– IV, tarsomere V slightly longer than tarsomere IV. Hindlegs: coxa very robust (strongly enlarged) 0.39 mm long, 0.18 mm wide; trochanter 0.25 mm long, 0.09 mm wide; femur very robust (strongly enlarged) and setulose, 0.53 mm long, 0.18 mm wide; tibia widening after midlength, distinctly setulose along dorsal edge and punctate, 0.7 mm long, 0.1 mm wide; tarsus 0.75 mm long, 0.04 mm wide, basitarsomere slightly shorter than remaining tarsomeres lengths combined, all others subequal in length. Tibial spurs formula 1-2-2; tarsal claws simple; arolium present. Forewing hyaline, covered with microsetae, 1.7 mm long and 0.67 mm wide; costal area at most as broad as pterostigma; pterostigma fully sclerotized, infuscate, darker basally; 1Rs extremely short, strongly angled with 1M; 1Rs+M longer than 2r-rs, 0.4× as long as 2Rs; 2Rs long and curved; 2r-rs reaching Rs slightly anteriad 2rm; 3Rs slightly curved reaching wing margin well before apex; R continuing along wing margin distad cell 3r apex; M+Cu basal half spectral; cell 1mcu trapezoidal, longer than wide, with sides 1Rs+M and 2Cu subparallel (both veins straight); M geniculate, angle between 2M and 3M ca . 160°; 2M curved; 3M slightly sigmoidal, longer than 2M; A straight; 1Cu slightly longer than 1Rs, slightly angled with 2Cu; 2Cu shorter than 1Rs+M; 3Cu long, distal third curved towards posterior wing margin; cell 2cua shorter and thinner than cell 1mcu; Rs, M and Cu distal abscissae reaching wing margin. Hind wing small (apex nearly aligned with 2Rs+M), hyaline, covered with microsetae; R with three(?) hamuli. Metasoma 2.11 mm long, 0.55 mm wide; petiole swelled ventrally in distal third, 0.75× as long as rest of metasoma, 0.8× as long as mesosoma; second metasomal segment sub-triangular (in lateral view), 0.44× as long as petiole. Parameres exerted and lobe-shaped. Remarks. Cretevania kachinensis sp. nov. differs from the two other species close to where it keys out because of wing venation characters. The new species differs notably from C . vesca in having 2rm cell ca . 1.8× as long as 1mcu cell, 1Rs 0.25× as long as 1M and subvertical to the latter, pterostigma base basad midpoint of 2Rs, 2r-rs 2.25× as long as pterostigma width, 1+2r cell 1.4× as long as 3r cell, 2Rs slightly longer than 3Rs, 1m-cu located basad 2Rs+M fork, angle between 1m-cu and 2Cu of ca . 110°, 1mcu cell about 1.6× as long as wide, 1cu-a postfurcal, 2cua cell closed (1cu-a and 2cu-a complete, and A slightly overpassing 2cu-a). FIGURE 2. Cretevania kachinensis sp. nov. , holotype IGR.BU-075. A , Head in right laterofrontal view (arrows pointing to the flagellomeres). B , Detailed lateral left view of mesosoma (arrows point to the limit between anepisternum and katepisternum). C , Detailed lateral left view of legs (arrows pointing respectively to mid and hind tibial spurs). D , Detailed lateral left view of metasoma (arrow pointing to swollen petiole). Scale bars = 250 µm ( A , D ), 100 µm ( B ), 500 µm ( C ). Cretevania kachinensis sp. nov. differs from C . alcalai because of the presence of the vein r-m (spectral, vs . absent? in C . alcalai ), the 2cu-a and A distinct with 2cu-a straight ( vs . fused to form a broadly curved vein), and the vein 1Rs subvertical (strongly inclined towards wing base in C . alcalai ). The new species differs from the two other species known from the mid-Cretaceous Burmese amber ( C . tenuis and C . bechlyi ) because of its unique combination of wing venation characters but also owing to its antennae and eye shape. Cretevania kachinensis sp. nov. differs from C . tenuis in having 2r-rs much shorter than its distance to pterostigma base (about as long as its distance to pterostigma base in C . tenuis ), i . e ., in having a much longer pterostigma. C . tenuis also has bigger and rounder eyes, 2Rs+M longer, and a thinner and longer 3r cell. It is worth noting that Cretevania kachinensis sp. nov. is also, with C . bechlyi , the only other member of the genus bearing 10 flagellomeres ( i . e ., 11 in other Cretevania species ). However, the scape and pedicel relative sizes are clearly different between the two species (scape very long and pedicel very short in C . bechlyi , more homogenous in size in Cretevania kachinensis sp. nov. ). C . bechlyi also has a 2cu-a subequal in length to 1m-cu (smaller than 1m-cu in Cretevania kachinensis sp. nov. ), and a petiole 0.5× as long as mesosoma (0.8× as long as mesosoma in Cretevania kachinensis sp. nov. ). C . bechlyi also has a distinctly spatulate wing shape, i . e ., area under 3Cu wide and expanded (the wing is more slender in Cretevania kachinensis sp. nov. , i . e ., not expanded under 3Cu).