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Table 2 Shared and variable morphological characters of Nymphister species

From: Nymphister kronaueri von Beeren & Tishechkin sp. nov., an army ant-associated beetle species (Coleoptera: Histeridae: Haeteriinae) with an exceptional mechanism of phoresy

  N. mono. N. kron. N. rett. N. simp.
Shared synapomorphic characters     
 Prosternal lobe narrow, strap-like yes yes yes yes
 Recurrent arms of inner lateral metasternal striae present yes yes yes yes
 Male abdominal sternite 8: halves separated, strongly reduced yes yes yes yes
 Male abdominal sternite 8: pair of small velae present yes yes yes yes
 Male abdominal tergite 8: intra-TAS plate absent yes yes yes yes
 Male abdominal tergite 9: apical projections present, fused to tergite body yes yes yes yes
 Male abdominal tergite 9: apical projections present thick, sclerotized yes yes yes yes
 Male abdominal tergite 10: absent yes yes yes yes
 Female abdominal sternite 8: apical margin cut all the way to the base yes yes yes yes
 Female abdominal sternite 8: basal bridge with prominent angulate basal angles yes yes yes yes
 Female abdominal sternite 8: separarte median sclerite absent yes yes yes yes
 Female abdominal tergite 8: present as two separate sclerites yes yes yes yes
 Female coxites connected by dorsal ridge only yes yes yes yes
 Female abdominal tergite 8: present as a s single plate conneted by its base to coxites yes yes yes yes
 Female genitalic sclerites present separate, simple elongate yes yes yes yes
Shared plesiomorphic characters     
 Body shape globular, subspherical yes yes yes yes
 Trichomes present no no no no
 Tibia short, paddle-like yes yes yes yes
 Lateral prosternal striae present yes yes yes yes
 Preapical foveae present no no no no
 Outer lateral metasternal striae present yes yes yes yes
 Outer lateral metasternal striae continuous with their recurrent arms yes yes yes yes
 Longitudinal discal metasternal striae present yes yes yes yes
 Paired lateral striae of abdominal ventrite 1 present yes yes yes yes
Synapomorphic characters modified in one species     
 Medially interrupted discal stria of mesosternite present no yes yes yes
 Inner lateral metasternal striae present no yes yes yes
 Inner lateral metasternal striae continuous with their recurrent arms no a yes yes yes
 Body surface with dense background microsculpture no yes no no
 Body surface with abundant long setae no yes no no
 Pronotal punctation present no yes no no
Plesiomorphic characters modified in one species     
 Dorsal striae present no yes no no
 Carinal striae widely separated, parallel no yes yes yes
 Carinal striae united anteriorly no yes yes yes
  1. Abbreviations: N. mono. Nymphister monotonus, N. kron. Nymphister kronaueri, N. rett. Nymphister rettenmeyeri, N. simp. Nymphister simplicissimus
  2. astriae proper are absent, but recurrent arms of metasternal striae are present; bold letters highlight differences between species; note that the assignment of synapomorphies and plesiomorphies in Histeridae is difficult, because a solid phylogeny with good taxon sampling is hitherto not available for this beetle family including its lower subdivisions