Ankyloleon caroluspetrus, Haug & Haug, 2023

Haug, Joachim T. & Haug, Carolin, 2023, New details of the enigmatic 100 million years old antlion-like larvae of Ankyloleon (Myrmeleontiformia, Neuroptera), European Journal of Taxonomy 908, pp. 135-154 : 145-147

Ankyloleon caroluspetrus sp. nov.

urn:lsid:zoobank.org:act:BF9BEF17-6347-4CB7-85DD-F70B6442B52A

Figs 4–6 , 7J

Diagnosis

Lacewing of the group Ankyloleon . Posterior region of the abdomen shorter than anterior part of abdomen. Most posterior region simply rounded. Head and prothorax with prominent socketed dolichaster-like setae.

Etymology

In honour of the late Karl-Peter Haug, important supporter of our research.

Type material

Holotype MYANMAR • PED 2038 . Locality and horizon Northern Myanmar, Kachin region, Late Cretaceous (Cenomanian).

Differential diagnosis

The new species differs in several relative lengths from A. caudatus . The head of the new species is wider, as is the anterior part of the abdomen. The posterior tail-like region of the abdomen is shorter than in A. caudatus . Also the setation differs: the new species has strongly socketed dolichaster-like setae; the setae in A. caudatus also have sockets, but not reaching that far distally. Setae in A. caudatus are prominent but simple, tapering distally, not being dolichoaster-like. At the posterior abdomen, A. caudatus has very long and prominent setae; the new species has rather short setae in this region.

Figures

Fig. 4. Late stage larva of Ankyloleon caroluspetrus sp. nov., holotype, PED 2038. A. Dorsal view B. Colour-marked version of A. C. Ventral view. Abbreviations: aa = anterior abdomen; hc = head capsule; pa = posterior abdomen; pt = prothorax; sy = stylet; te = trunk end.

Fig. 5. Late stage larva of Ankyloleon caroluspetrus sp. nov., holotype, PED 2038, continued. A. Closeup of head. B. Close-up of distal part of stylets. C. Close-up on inner edges of stylets with serrations. D. Close-up on possible antenna and dolichaster-like setae with prominent sockets. Abbreviations: at? = possible antenna; se = seta; so = socket. A, D are images under reflected light; B–C are inverted images under transmitted light.

Fig. 6. Late stage larva of Ankyloleon caroluspetrus sp. nov., holotype, PED 2038, and modern larva for comparison. A–C. Legs of PED 2038. A. Close-up on first pair of walking legs. B. Colour-marked version of right leg of larva. C. Colour-marked version of left leg of larva. D–E. Modern larva of an owllion (“Ascalaphidae”; for terminology issues, see Haug et al. 2022c), ZMH 62877. D. Overview in ventral view. E. Close-up on legs. Abbreviations: cx = coxa; fe = femur; ta = tarsus; ti = tibia; tr = trochanter.

Fig. 7. All known specimens of Ankyloleon Badano, Haug & Cerretti, 2021 as simplified restorations, all to the same scale. A–C. Specimens of Ankyloleon caudatus Badano, Haug & Cerretti, 2021. D–I. Specimens of unclear species. J. Holotype (PED 2038) of A. caroluspetrus sp. nov. C–F and I based on Badano et al. (2021).