extinct genus ants genus tribe subfamily fossils single identified species known middle cretaceous north_america genus ants described new_jersey initially placed subfamily transferred subfamily distinguished ants unusual like morphological features makes unique small measuring millimetres present specimens collected morphology suggest high level feeding history classification known adult fossils specimen number collected described time genus description type specimens residing new_york_city described specimens worker adult females preserved transparent new_jersey amber amber specimens recovered deposits formation new_jersey amber dated approximately placing late cretaceous analysis amber composition indicates originated deposited salt water marshes cretaceous eastern species described new_jersey amber type fossils studied team type description new genus species published journal genus coined honoring described cretaceous genus species specific epithet chosen reference distinctive antennae seen workers carpenter placed new genus extant subfamily tribal assignment based slight noted features shared ants group workers spurs lower edge area small compound eyes workers narrow long genera placement unchanged revision subfamily published paper subfamily shown grouping included genera moved separate including unique combination morphological features found erected new subfamily genus notes like lack teeth usual ants associated slave making behavior extant genera contrast stem group ants workers elongated like crown group ants phylogenetic examination notes possibility crown group genus placed subfamily informal grouping description worker worker complete fully preserved positions extended worker incomplete amber highly likely partly polished rock causing exposed portions head left antenna mid legs hind legs right antennae gone exposure allowed interior cavity fossil examined scanning electron microscope coated layer gold overall body length approximately millimetres finely scattered parts head large small rounded compound eyes comprised clearly present absent clearly absent specimen shaped teeth present interior sides length head cross near mid length oral surfaces bear approximately thirty short needle like short wide crossing width head perpendicular run upper margin specimen distinct tooth like structure lower sides antennae distinct having definite tip feature seen described cretaceous ants segment nearly twice width segments sixth segments shortest second slightly swollen raised small projecting notably raised having ridge leading degree obscured bubbles escaped soon worker forms pointed apex instead rounded dome covering fine hairs pair small situated near apex narrow attachment area rear large attachment small plate developed shows rear edge small distinct second segments specimens fully preserved tip showing extended sting missing tip area unusual morphology scientists suggested high level feeding
Brownimecia