Adicophasma hafniensis Perkovsky & Storozhenko, 2024

Perkovsky, Evgeny E. & Vasilenko, Dmitry V., 2024, New and little-known Mantophasmatidae (Insecta: Mantophasmatodea) from European amber, Zootaxa 5446 (4), pp. 553-563 : 557-558

Adicophasma hafniensis Perkovsky & Storozhenko , sp. nov.

Figs 9–23

Etymology. The species name is after Universitas Hafniensis (Københavns Universitet), the oldest university in Denmark, where the type was found at NHMD (the former Zoological Museum of Copenhagen University, ZMUC).

Type material. Holotype ZMUC-901825, with old label ‘Phasmoidea 1825 C. V. Henningsen 1-2-1969 ’, Danish amber, late Eocene. Nymph, probably mid instar. The sex unknown, because of in the nymphs of extant Mantophasmatodea the apical abdominal sternites and cerci are not strongly modified such as in adult specimens. Syninclusions: stellate hairs.

Diagnosis. New species is most similar to Adicophasma grylloblattoides but differs from the latter by enlarged pedicel and chaetotaxy of abdomen (in A. grylloblattoides , pedicel as long as wide and sternites with scattered, simple setae). In A. spinosum pedicel elongated, at least 3 times longer than wide, scapus shorter than elongated pedicel, anterior side of procoxa with 3 long bristles, and sternites with numerous sparse setae of moderated length. The features separated A. groehni from new species are follow: the posterior margin of pro-, meso- and metatorax with 6 long bristles and the posterior margin of sternites with a row of up to 8 bristles.

Description. Head hypognathous; the compound eyes large and protrude slightly above the head; vertical diameter of the eye significantly exceeds the height of the cheeks. Frontoclipeal suture broadly rounded; clipeus triangular; labrum narrow triangular with acutely rounded apex. Antennae 16-segmented; scapus cylindrical, 1.5 times as long as wide, about equal in size to pedicel; pedicel 1.5 times as long as wide; third antennomere (first flagellomere) elongated, 3.5 times as long as wide and 1.4 times as long as scapus. Maxillary palpus 5-segmented, second and fifth palpomeres longest, other palpomeres short. Labial palpus 3-segmented.

Thorax. Pronotum distinctly shorter than head, almost as long as meso- and metanotum, with almost straight posterior margin armed by four bristles. Dorsal side of pro-, meso- and metatorax with numerous, mostly irregularly situated, spine-like bristles. Thoracic tergites distinctly marginated laterally and posteriorly; posterior margin of mesothorax straight and with a row of six bristles. Metatorax narrower than mesothorax, with a few irregularly situated bristles.

Legs. Pro- and metafemora slightly broadened and longer than more slender mesofemora. Ventral side of proand mesofemora with two rows of spine-like bristles. Protibia with numerous hair-like setae, inner side apically bearing 3-4 setae with cuticular thickenings at base. Mesotibia not visible. Coxae elongate, anterior side of procoxa with a long bristle. Tarsi 5-segmented, basitarsus as long as second tarsomere; third segments slightly longer than second; fourth tarsomere as long as third; third and fourth tarsomere with wide distal process in the middle; fifth segment elongate; arolium large, with typical for the Mantophasmatodea preapical row of setae.

Abdomen. Abdominal tergites transverse, with a few irregularly situated very long setae; anal plate trangular. Abdomem below with visible four apical sternites and subgenital plate. Hind margin of 8-th and 9-th sternites with two strong bristles; apex of subgenital plate with deep excision; paraprocts considerably extending beyond apex of subgenital plate; cerci simple. Lateral sides of sternites and cerci with very long, thin and densely arranged setae.

Lengths (mm): Total: 3.2; head: 0,56; antennae: 3.35; pronotum: 0,43; mesonotum: 0,41; metanotum: 0,4; profemora: 0,75; protibiae: 0.82; protarsi: 0,65; mesofemora: 0,76; cerci 0,15.

Remarks. This is first record of the genus Adicophasma from late Eocene Danish amber.

Figures

FIGURES 9–12. Adicophasma hafniensis sp. nov. 9. Thoracic and abdominal tergites, dorsal view; 10. Fifth tarsal segment and arolium, dorsal view; 11. Anterior half of body, lateral view; 12. Head and profemur, frontal view.

FIGURES 13–16. Adicophasma hafniensis sp. nov. 13. Body, fronto-ventral view; 14. Apex of abdomen, ventral view; 15. Mesofemur from inner side, lateral view; 16. Fore leg from inner side, lateral view.

FIGURES 17–23. Adicophasma hafniensis sp. nov. 17. Head, basal segments of antennae, thoracic segments and coxae, lateral view; 18. Head, frontal view; 19. Fore leg, lateral view; 20. Metafemur, lateral view; 21. Thoracic and abdominal tergites; 22. Apex of abdomen, ventral view; 23. Fifth tarsal segment and arolium, dorsal view.