Nannarrup Foddai, Bonato, Pereira & Minelli, 2003

Tsukamoto, Sho, Shimano, Satoshi & Eguchi, Katsuyuki, 2022, Two new species of the dwarf centipede genus Nannarrup Foddai, Bonato, Pereira & Minelli, 2003 (Chilopoda, Geophilomorpha, Mecistocephalidae) from Japan, ZooKeys 1115, pp. 117-150 : 117

Genus Nannarrup Foddai, Bonato, Pereira & Minelli, 2003

New Japanese name: Himejimukade-zoku Fig. 5

Nannarrup Foddai, Bonato, Pereira & Minelli, 2003: 1255-1256.

Type species.

Nannarrup hoffmani Foddai, Bonato, Pereira & Minelli, 2003

Diagnosis.

Partly modified from Foddai et al. (2003). Adult body length ca 10 mm (Fig. 5A ). Cephalic plate only slightly longer than wide, with frontal line absent or replaced by areolation. Two small clypeal plagulae covering ca one-sixth of the clypeus. Bucca without setae. Stilus present, relatively short. Spiculum absent. Side-pieces of labrum only incompletely subdivided into anterior and posterior alae by fragmented line very poorly marked. Mandible provided with four well-developed pectinate lamellae. Coxosternite of first maxillae medially divided. Coxosternite of second maxillae undivided, without suture or membranous isthmus. Metameric pore close to posterior margin of coxosternum of second maxillae, not to lateral ones. Claw of second maxillae only represented by terminal spine. Forcipular telopodites far behind anterior margin of head in the closed position. Forcipular trochanteroprefemur with pigmented single distal denticle; femur without teeth; tarsungulum with basal, well-developed denticle. Forcipular tergite without median sulcus. Sternal sulcus not anteriorly furcate. Last metasternite subtriangular. Ventral surface of each coxopleuron with numerous pores. Anal pore present. Forty-one pairs of legs.

Remarks.

The following characters included in the diagnosis sensu Foddai et al. (2003) are different among the three Nannarrup species: presence/absence of a pair of smooth or areolate areas along the posterior part of the paraclypeal sutures, presence/absence of a tubercle on the forcipular tibia, pigmentation of the denticle on the tarsungulum (Table 3 ). In total, 74 out of 88 collected specimens of Nannarrup (ca 84%) exhibited a leaning posture or even threw back their head when stored in ethanol (Fig. 5B ). Although such a "death pose" has not been quantitatively investigated in Geophilomorpha, in the authors’ experience, it is a unique phenomenon in Nannarrup that may be related to the internal morphological characteristics of the genus.

Figures

Figure 5. Nannarrup innuptus sp. nov., paratype (TS 20210503 - 02) A habitus (provided by Dr Namiki Kikuchi) B " death pose " with head capsule detached. Scale bars: 1 mm.