Neanaperiallus Gibson, 2009

Gibson, Gary A. P. & Fusu, Lucian, 2023, Leptoomidae, a new family of Eocene fossil Chalcidoidea (Hymenoptera), and family classification of Eocene fossil genera originally described in Neanastatinae (Eupelmidae), Zootaxa 5318 (2), pp. 195-216 : 209

Neanaperiallus Gibson

( Figs 1A , 2B , 4 , 5 )

Neanaperiallus Gibson, 2009: 200‒203 .

Included species. Neanaperiallus janzeni Gibson and Neanaperiallus defunctus Fusu sp. nov.

Diagnosis. Head and mesosoma non-metallic, brown. Head with inner margins of eyes apparently not divergent ventrally or at least not conspicuously divergent (not visible in N. janzeni and direct frontal view not possible for N. defunctus , Fig. 5E ); clypeal area concave and labrum perpendicular to clypeus (i. e. not visible in direct frontal view of clypeus, cf. Fig. 5E and inset in 5E); occipital carina ∩ -shaped ( Fig. 5F ; Gibson 2009, fig. 59). Mandible not visible in N. janzeni but apparently tridentate in N. defunctus . Antenna with lower margin of torulus in line with or slightly ventral to lower margin of eyes; 13-segmented (1:1:8:3) with 8 slightly transverse to slightly elongate funiculars and with mps on fu 3 ‒fu 8 ( Figs 4B, C, F ; Gibson 2009, fig. 58); clava elongate-ovoid, more than twice as long as wide, and apical clavomere with minute micropilose sensory region apically, appearing as rounded terminal button ( Fig. 4C : tb). Mesoscutellar-axillar complex with axillae equilateral to somewhat elongate-triangular, with their inner angles slightly separated and mesoscutellum truncate basally when mesonotum not flexed ( Figs 4G, H ) (flexed condition unknown); mesoscutellum with sculpture along apical margin aligned, differentiating a thin carina ( Figs 4E, 4H , 5H : smc) separating lunate, down-sloped region apically. Metanotum with dorsellum an oblique band projecting over apex of mesoscutellum ( Fig. 5H ) but the two sclerites separated by a narrow gap ( Fig. 5H : double arrow in inset). Prepectus flat ( Fig. 4F : pre). Acropleuron enlarged posteriorly to metapleuron and posteroventrally to dorsolateral level of mesocoxa, with crenulate acropleural sulcus directed obliquely toward posterodorsal angle of prepectus over most of length ( Fig. 1A ) or only over about anterior one-third ( Fig. 5A ) but differentiating acropleuron from comparatively large mesepisternal region ventral to acropleural suture ( Figs 1A , 5A ). Mesopectus in ventral view with posterior margin abutting base of mesocoxa ( Fig. 2B ) though mesocoxa with triangular basolateral cavity opposite angle formed between acropleuron and mesopectus ( Fig. 2B ; Gibson 2009, fig. 61). Fore wing disc with bare band beyond basal fold separated from parastigma by region of setae ( Figs 5G, H ; Gibson 2009, fig. 62), parastigma not separated from marginal vein by hyaline break though apparently slightly less pigmented distally ( Figs 5G, H ). Protibia apparently without dorsal spicules but with dorsoapical spicules ( Fig. 5A , inset); mesotibia with spine-like pegs apically ( Fig. 5C ).

Remarks. The extended generic diagnosis given above for Neanaperiallus is to supplement the description in Gibson (2009) after the discovery of a second fossil that represents a second species in the genus, and to have a comparative description with Leptoomus . As noted above, the state of preservation and the inability to examine the two available inclusions equally from all angles prevents directly comparable, accurate description of all parts of the two species so the generic diagnosis and/or species descriptions may be inaccurate in some respects for one or both species. Additional inclusions are necessary to further clarify apparent similarities and differences between Neanaperiallus and Leptoomus and between N. defunctus and N. masneri .

Figures

FIGURE 1. Lateral view of mesosoma: A, Neanaperiallus masneri; B, Leptoomus janzeni; C, Tanaostigmodes sp.; D, Cynipencyrtus ishii; E, Eopelma gibsoni; F, Savzdargia sp.; G, Neanastatus sp.; H, Lambdobregma sp.; I, Brevivulva electroma. Insets in H and I are dorsal views of apex of mesoscutellum to propodeum; green arrows on images indicate the intersection of base of tegula with dorsal margin of prepectus, white arrows indicate posterior margin of prepectus; see ‘Material and methods’ for abbreviations.

FIGURE 2. A, Cynipencyrtus ishii, mesosoma, ventrolateral view. B, Neanaperiallus masneri, mesosoma, ventral view. C‒E, Leptoomus janzeni: C, mesosoma, ventrolateral view; D, posterior of mesopectus and mesocoxa, posterior view; E, mesopectus and mesocoxae, posteroventral view. F, Tanaostigmodes sp., mesosoma, ventral view. G & H, Leptoomus janzeni: G, head and antenna, frontal view; H, head and mesosoma, dorsolateral view. See ‘Material and methods’ for abbreviations.

FIGURE 4. A‒C & E‒G, Neanaperiallus defunctus sp. nov., holotype ♀: A, habitus with amber piece containing the fossil as an inset; B, head and outer view of antenna; C, antenna in dorsal view; E‒G, head and mesosoma with arrow in G indicating the posteriorly dilated part of the propodeal carina. D & H, Neanaperiallus masneri: D, fore and hind wings; H, mesosoma in dorsal view. See ‘Material and methods’ for abbreviations.

FIGURE 5. Neanaperiallus defunctus sp. nov., holotype ♀: A, head and mesosoma in ventral view, protibia as an inset with arrow indicating dorsoapical pegs; B, apex of mesotibia and mesotarsus in dorsal (posterior) view; C, apex of mesotibia and mesotarsus in ventral (anterior) view; D, distal part of gaster in ventral view; E, head in ventral view with the inset showing the clypeus, labrum and mandibles and arrows indicating the mandibular teeth; F, head in posterior view; G, fore wing; H, fore wing base and, as inset, mesoscutellar-axillar complex, apex of mesoscutellum and dorsellum with double-headed arrow within gap between the two sclerites and single arrow indicating the subvertical mesoscutellar apex. See ‘Material and methods’ for abbreviations.