Eminepygia myanmarensis, Chen & Zhang, 2021

Chen, Xin-Yu & Zhang, Hua-Chuan, 2021, Eminepygia myanmarensis sp. nov., a new Earwig (Dermaptera) Nymph in Burmese Amber, Zootaxa 4952 (3), pp. 571-579 : 573-574

publication ID	https://doi.org/ 10.11646/zootaxa.4952.3.9
publication LSID	lsid:zoobank.org:pub:F498351B-FA1A-4610-8108-6BA8F9B316B4
DOI	https://doi.org/10.5281/zenodo.4690724
persistent identifier	https://treatment.plazi.org/id/A17D401D-FF8C-C333-FF26-B6B1FC07FAE0
treatment provided by	Plazi
scientific name	Eminepygia myanmarensis
status	sp. nov.

Treatment

Eminepygia myanmarensis View in CoL sp. nov.

( Figs. 1‒5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 )

Etymology. The specific name is the Latinized Burmese word “ Myanmar ” referring to the country from which the material originates.

Type material. Holotype, CSCLRCAB100190, well-preserved; deposited at the Cores and Samples Center of Land & Resources ( CSCLR), Sanhe, Hebei, China.

Locality and horizon. Hukawng Valley, Kachin State, Northern Myanmar; lowermost Cenomanian, mid-Cretaceous.

Diagnosis. As for the genus.

Description. Holotype: third-instar nymph. Medium-sized earwig, 5.5 mm in length (excluding antennae and cercal forceps) ( Fig. 1 View FIGURE 1 ); head 0.80 mm long, 0.83 mm wide. Integument (as preserved) brown to light brown; strongly imbricate with shallow, weak, coarse punctures and sparse long setae.

Head ( Fig. 2 View FIGURE 2 ) prognathous, with medial length from clypeal to posterior border 0.69 mm, maximum width across compound eyes 1.17 mm; surface not tumid; ecdysial cleavage scar clearly “Y”-shaped ( Fig. 2 View FIGURE 2 ; ec), postocular ridge present albeit weak; temple corners acute with series of stiff, erect setae, such setae extending along posterior margin of head, length of head behind compound eye 0.83 mm; clypeus ( Fig. 2 View FIGURE 2 ; c) with scattered, relatively long setae; maxillary palpus ( Fig. 2 View FIGURE 2 ; mp) visible but not clear, with short sub-appressed setae; lacinia ( Fig. 2 View FIGURE 2 ; l) slender, with two apical teeth; galea ( Fig. 2 View FIGURE 2 ; g) highly sclerotized with one dagger-shaped tooth.

Compound eyes 0.21‒0.23 mm ( Fig. 2 View FIGURE 2 ; e), ellipsoid, medium-sized, prominent and exophthalmic, interocular distance 0.93 mm; ocelli absent; ventral cervical sclerites ( Fig. 2 View FIGURE 2 ; vcs) of equal size.

Antenna 1.84–1.93 mm ( Fig. 2 View FIGURE 2 ; a), with at least 11 antennomeres; scape relatively robust, length 0.31–0.33 mm; pedicel short, about one-fourth as long as the scape; meriston 0.28 – 0.30 mm long, length approximately three times the width, slightly thinner than scape; the subsequent flagellomere about as long as wide, remaining flagellomeres longer than width.

Pronotum ( Fig. 3 View FIGURE 3 ; prn) subrectangular, 1.13 mm wide, 0.92 mm long, with elongate, prominent, stiff setae at anterolateral corners and 2-3 short, stiff prominent setae near or at posterolateral angles; scutellum not present. Mesonotum ( Fig. 3 View FIGURE 3 ; msn) wider than long, 1.08 mm wide, 0.85 mm long, posterior border faintly and broadly convex, anterior margin covered by posterior margin of pronotum; metanotum ( Fig. 3 View FIGURE 3 ; mtn) 0.62 mm long, 1.19 mm wide, posterolateral angles broadly rounded, anterior margin covered by posterior margin of mesonotum.

Legs ( Fig. 4 View FIGURE 4 ) short, with spines or bristle-like setae on dorsal surface of femora; tarsi trimerous; forecoxae close but separated; fore femur thick and short, 0.63 mm long, 0.14 mm wide; middle femur 0.68 mm long, 0.18 mm wide; hind femur ( Fig. 4 View FIGURE 4 ; hf) 0.87 mm long, 0.19 mm wide; hind femur more swollen than other femora; tibia slightly longer than tarsi combined; pretarsal claws simple, arolium absent; tarsomere I ( Fig. 4 View FIGURE 4 ; t 1 View FIGURE 1 ) elongate, with dense setae along ventral surface; tarsomere II ( Fig. 4 View FIGURE 4 ; t 2 View FIGURE 2 ) blunt apically, not extending beneath the distalmost tarsomere; tarsomere III ( Fig. 4 View FIGURE 4 ; t 3 View FIGURE 3 ) elongate, slightly shorter than tarsomere I; pretarsal claws long, simple; arolium absent.

Abdominal length 3.77 mm (excluding cerci), all ten transverse segments visible ( Fig. 5 View FIGURE 5 ), first five segments and last five segments nearly equal in length; lateral abdominal margins gently convex; terminal tergum 0.28 mm long, 0.72 mm wide, as long as tergite IX, with straight peg-like tubercle ( Fig. 5 View FIGURE 5 ; st) on posterior border; prominent bulges ( Fig. 5 View FIGURE 5 ; b) present, rising from lateral margins of tergite VIII, extending onto the lateral margins of tergite IX triangularly, and slightly extending past anterior border of tergite X.

Cercal forceps short, symmetrical, apices acute, curved and unsegmented, length 0.54 mm, separation between bases 0.32 mm; the inner edges appearing gradually arching; pygidium ( Fig. 5 View FIGURE 5 ; p) simple, segmented and basally subtriangular, without ornamentation, visible only on ventral view; paraproct ( Fig. 5 View FIGURE 5 ; pr) obvious.

Comments. In early instars the flagellomeres are poorly differentiated ( Ren et al., 2018). The greatly elongated meriston and the reduced number of total flagellomeres are suggestive of an early instar ( Brindle, 1987). The weakly swollen, paler lobes of the metanotal posterolateral area and the elongate meriston demonstrate some degree of development, thus suggesting that the specimen is likely a third instar.