Plusiocampa (Pentachaetocampa), Sendra & Weber, 2018

Sendra, Alberto & Weber, Dieter, 2018, An unexpected discovery of a new subgenus and a species of Plusiocampa (Campodeidae, Diplura) alongside an overview of Central European subterranean campodeids, European Journal of Taxonomy 428, pp. 1-21 : 3-4

Pentachaetocampa subgen. nov.

urn:lsid:zoobank.org:act:40D4FFE0-74AE-4E70-A171-489291D8C85E

Type species

Plusiocampa (Pentachaetocampa) inopinata subgen. et sp. nov.

Diagnosis

Mesothoracic and metathoracic femur having five dorsal macrosetae ( Fig. 12 ), up to 3 on prothoracic femur; presence of a narrow field of g 1 -glandular setae in adult females ( Figs 6 , 15–16 ). In addition to these unique features, there are other characters in common with Plusiocampa species, such as: notal macrosetal formula (1+1 ma, 4+4 la 1,2,3,4, 2+2 lp 2,3 pronotum, 1+1 ma, 3+3 la 1, 2, 3, 2+2 lp 2, 3, 1+1 mp mesonotum, and 1+1 ma, 1+1 la 1, 2+2 lp 2,3, 1+1 mp metanotum) ( Fig. 3 ); 2–3 ventral macrosetae on tibia ( Fig. 12 ); slightly unequal elbow-like claws with short extension at the basal end of the posterior claw; lateral crests well developed ( Figs 13–14 ); urotergal macrosetal formula (1+1 post 1 on I–II; 1+1 post 1, 1+1 la on III; 2+2–3+3 post 1,2,3, 1+1 la on IV; 5+5 post 1–5, 1+1 la on V–VII, 6+6–5+5 post on VIII; 8+8 post on IX) ( Fig. 4 ); urosternal macrosetal formula (7+7 on I; 5+5 on II–VII; 2+2 on VIII urosternites); female and male urosternite I with a narrow posterior field of g 1 -glandular setae and subcylindrical appendages having a field of a 1 -glandular setae ( Figs 5-6 ).

Etymology

Penta in addition to chaetae (chaeta –), both from the Greek words which means five setae in reference to the noticeable five dorsal macrosetae on the femur.

Phyletic affinities of the subgenera of Plusiocampa

Recently, weak support was found for the classification of Campodeidae ( Sendra et al. 2017) , specifically within Plusiocampinae Paclt, 1957 , based on the sparse number of solid characters and the high intraspecific and interspecific variation of many of them. This makes the taxonomy of the Plusiocampinae a delicate subject, with only a few synapomorphic features that can be used to put some order into the problematic subfamily proposed by Paclt (1957). All Plusiocampinae have at least 1+1 ma, 1+1 la and 2+2 lp 2,3 on its pronotum, known in all the ten previously described genera ( Sendra et al. 2017). Among them, Plusiocampa with 57 species distributed around the Mediterranean Basin ( Condé 1956) is the most diversified. The exceptions are the two Chinese species Plusiocampa (Dydimocampa) sinensis Silvestri, 1931 and Plusiocampa (Didymocampa) lipsae Condé, 1993 , although both should be removed from Plusiocampa due to the macrosetal formula on urosternites II to VIII. Furthermore, a laminar telotarsal process is present in the case of P. lipsae . As a consequence, a new diagnosis of Plusiocampa is proposed: telotarsus with lateral crests and smooth-setiform lateral processes; pronotal formula with 1+1 ma and 2+2 lp macrosetae and from 2+2 to 4+4 la macrosetae; no less than 3+3 post macrosetae on urotergites VI–VII; no less than 5+5 macrosetae on urosternites II–VII and 2+2 macrosetae on urosternite VIII; and sensillum of antennomere III in a ventral position.

The genus Plusiocampa was divided into four subgenera based on two features, the dorsal macrosetae on the femur ( Paclt 1957) and the ventral macrosetae on the tibia. Using these two synapomorphic features and additional ones, the following taxonomic key is proposed for the current five subgenera, Pentachaetocampa subgen. nov. included.

Figures

Figs 7-12. Plusiocampa (Pentachaetocampa) inopinata subgen. et sp. nov. 7–8. Metanotum. 7. Macrosetae la1,2,3 and mp. 8. Detail of surface. 9. Cupuliform organ of last antennomere. 10. Sensillum of cupuliform organ. 11. Gouge sensilla. 12. Metathoracic leg. Scale bars in µm.

Figs 5–6. Plusiocampa (Pentachaetocampa) inopinata subgen. et sp. nov. Urosternite I. 5. Male. 6. Female. a1 = a1-glandular setae, g1 = g1-glandular setae. Scale bars: = 0.1 mm.

Figs 13–17. Plusiocampa (Pentachaetocampa) inopinata subgen. et sp. nov. 13. Tarsal end of metathoracic leg. 14. Detail of telotarsal claw. 15. Urosternites I-II of a female. 16. g1-glandular setae of urosternite I of a female. 17. Stylus of urosternite VII. Scale bars in µm.

Figs 3–4. Plusiocampa (Pentachaetocampa) inopinata subgen. et sp. nov., holotype, ♀. 3. Pro-, meso- and metanotum, left side. 4. Urotergites I–IX, left side. Scale bars = 0.2 mm.