Jacobsonina erebis, Wu, Keliang, Yue, Qiaoyun, Qiu, Deyi & Liu, Dexing, 2014

Wu, Keliang, Yue, Qiaoyun, Qiu, Deyi & Liu, Dexing, 2014, One new species in the cockroach genus Jacobsonina Hebard 1929 (Blattodea, Ectobiidae, Blattellinae) from Mainland China, Zootaxa 3847 (2), pp. 275-282 : 277-281

Jacobsonina erebis sp. nov.

( Figs. 1–17 )

Description. Holotype length, male, pronotum length×width, 2.3×3.2mm; tegmen length, 7.5mm; overall length, 10.0mm.

Paratypes length, male, pronotum length×width, 2.1–2.5×2.8–3.2mm; tegmen length, 7.5–8.0 mm; overall length, 9.0–10.0mm; female, pronotum length×width, 1.7–2.5×2.8–3.2mm; tegmen length, 7.0–7.5 mm; overall length, 9.0–9.5 mm.

Body black ( Figs. 1–4 ). Head black and eyes black ( Figs. 2, 4 ). Ocellus red ( Figs. 2, 4 ). Clypeus and labrum yellow ( Figs. 2, 4 ). Antenna and maxillary palps brown ( Figs. 2, 4 ). Pronotum black with yellow lateral margin ( Figs. 1, 3 ). Tegmina black with yellowish semihyaline lateral margin ( Figs. 1, 3 ). Leg yellow, coxa and femur margin brownish black ( Figs. 2, 4 ). Abdomen brownish black ( Figs. 2, 4 ). Cercus brownish black ( Figs. 2, 4 ).

Interocular space equal to the distance between antennal sockets, maxillary palps with segments 4 and 5 about the same length, but slightly shorter than the third ( Figs. 2, 4 ). Pronotum subelliptical, widest portion is behind the middle, posterior margin slightly protruding ( Figs. 1, 3 ). Tegmina and wings fully developed extending well beyond the end of abdomen ( Figs. 1–4 ). Front femur Type B3 ( Figs. 2, 4 ). Tarsal claws symmetrical, unspecialized.

Male abdomen with genitalia. Abdominal tergum unspecialized. Supra-anal plate symmetrical, with hind margin arched ( Fig. 5 ). Paraprocts dissimilar, left one with thick protrusion bending to dorsal, right one rounded with strong spinule on the surface ( Fig. 5 ). Hypandrium asymmetrical, middle part of hind margin protruding with margin straight and oblique to the left, bearing some strong spicules on each corner of ventral surface ( Fig. 6 ). Arched and deeply concave in left margin, and shallow on right ( Fig. 6 ). Styles absent ( Fig. 6 ). Hook of left phallomere (l.h.s.) with sclerotized portion occupied 2/3 of its length, with V-shaped incision on terminus ( Fig. 7 ). Appendage sclerite of left phallomere (l.a.s.) slender, both ends expanded, left portion bent ( Fig. 7 ); median phallomere curved at middle, with a narrowed apex bending to dorsal ( Fig. 8 ). Appendage sclerite of median phallomere composed of three sclerites. Left sclerite (m.a.l.s.) brush-shaped, bearing many long setae on one side; middle sclerite (m.a.m.s.) slender, one terminal expanded, the other side tapered; right sclerite (m.a.r.s.) twisted, right side bent ( Fig. 9 ); right phallomere composed of three sclerites, anterior sclerite (r.a.s.) slender, “Y” shaped; middle sclerite (r.m.s.) sheeted; posterior sclerite (r.p.s.) incrassate, strawberry shaped ( Fig. 10 ).

Female abdomen with genitalia. Supra-anal plate symmetrical, hind margin nearly triangular ( Fig. 14 ). Right and left paraproct broad and similar ( Fig. 14 ). Hypandrium symmetrical, broad, hind margin arched, shorter than supra-anal plate ( Fig. 4 ). First valvifer arm (vlf.Ia) broad, right one with some strong spinules on ventral surface, left one smooth ( Fig. 15 ). Paratergites (pt.) slender and bend to upside, connecting supra-anal plate with first valvifer arm ( Fig. 15 ). Laterosternite IX (ltst.IX) short and nearly close to paratergites ( Fig. 15 ). Valvule located between paratergites. First valvule (VI) bent, connected with first valvifer arm and paratergites at the base ( Fig. 15 ). Third valvule (VIII) located near the dorsal part of first valvule, the left one and the right one connect by anterior arch (a.a.) ( Fig. 17 ). Intercalary sclerite (intc.s.) located at the dorsum of third valvule, sheeted, terminus slightly acute, base slightly expanded ( Fig. 17 ). Posterior lobes of valvifer II (p.l.) spanning the third valvule, terminus broader and middle narrowed ( Fig. 17 ). Oviporus sclerite (o.s.) triangular, with a triangular oviporus in the middle; a pair of transparent sclerites located in the middle, toward to posterior; a pair of articular fossa located at the basal part of transparent sclerite ( Fig. 17 ). Second valvule (VII) located between third valvule, connecting to oviporus sclerite by a pair of articulatio spheroidea ( Fig. 16 ). Laterosternal shelf (ltst.sh.) located beneath first valvifer arm, broad, rectangular, with two sharp protrusions toward posterior side ( Fig. 13 ). Vestibular sclerite (vst.s.) small, approximate oval; two symmetrical sclerites located on each side of vestibular sclerite, with stem slender, basal part bent, near terminus expanded, extreme apex pointed to side ( Fig. 13 ). Basivalvula (bsv) located in front of laterosternal shelf. Anterior border cambered, middle vacuous, posterior part separate from dorsal sclerite and ventral sclerite. Dorsal sclerite separates into asymmetrical left portion and right portion, posterior part with a finger-like protrusion, left one stronger than the right one, both having some strong spines on interior surface; a slender sclerite located on the left of finger-like protrusion, toward to posterior; ventral sclerite anterior surface smooth, with two pointed protrusions on both lateral margins, left smooth and right one with some strong spines; there are two sheetlike sclerites toward posterior with some spines on interior surface, lateral part gradually turning into membrane, interior margin with strong sclerite, distally bending to interior and expanding to approximate triangle, both sides connect in the middle with a translucent furcation sclerite located on it, toward the anterior, two branches are symmetrical and curving, with ventral surface grooved ( Figs. 11, 12 ). Spermathecal plate(sp.pl.) comb-shaped, pellucid, weakly ossified, nearly membranous ( Figs. 11, 12 ).

Materials examined. Holotype ♂, China, Tibet Autonomous Region, Motuo, E95°18′ 5.27″, N29°19′ 32.34″, 7, Sep., 2013, Coll. Ke-Liang Wu, De-Xing Liu. Paratypes: 7♂ 2♀, China, Tibet Autonomous Region, Motuo, E95°18′ 5.27″, N29°19′ 32.34″, 7, Sep., 2013, Coll. Ke-Liang Wu, De-Xing Liu.

Remarks. The species is similar to J. platysoma ( Walker, 1868) but can be distinguished by the following characteristics: 1) The new species hypandrium hind margin protrudes obliquely to left; but is transverse in the later; 2) The strong spicules exist only on each corner of the protrusion, while in the later one they exist along the whole margin; 3) Appendage sclerite of median phallomere has a brush-shaped sclerite, the later one lacks this sclerite; and 4) Left phallomere with a slender appendage sclerite, the later lacks this sclerite.

This new species is nocturnal, usually walking on wide foliage at night searching for food or mating; its dark color can protect it well from being captured by the predator. It hides in cracks, crevices or the litter layer under the decaying vegetation during daytime.

Etymology. The specific epithet is derived from the name of Greek god “ Erebos ” which means “dark”, referring to the black color of this new species.

Distribution. China (Tibet Autonomous Region)

FIGURES 18–35. Characteristics used in key. 18. J. parva Bey-Bienko, 1970 , hypandrium, ventral view (after Bey-Bienko, 1970); 19, 20. J. platysoma ( Walker, 1868) , hypandrium, ventral view (after Roth, 1993); 21. J. tortuosa Wang, Jiang & Che, 2009 , hypandrium, dorsal view (after Wang, Jiang & Che, 2009); 22. J. tricaudata ( Hebard, 1929) , hypandrium, dorsal view (after Roth, 1993); 23. J. aliena (Brunner von Wattenwyl, 1893), hypandrium, ventral view (after Roth, 1993); 24. J. chiangmaiensis Roth, 1999 , supra-anal plate and hypandrium, dorsal view (after Roth, 1999); 25. J. chiangmaiensis Roth, 1999 , median phallomere, dorsal view (after Roth, 1999); 26. J. excavata Roth, 1999 , supra-anal plate and hypandrium, dorsal view (after Roth, 1999); 27. J. excavata Roth, 1999 , median phallomere, dorsal view (After Roth, 1999); 28. J. simplex Hebard, 1929 , 7th abdominal segment (after Roth, 1993); 29. J. albomarginata ( Hanitsch, 1935) and J. myitkyina Roth, 1999 , gland on 1th abdominal tergum (after Roth, 1999); 30. J. albomarginata ( Hanitsch, 1935) , male genitalia, dorsal view (after Roth, 1999); 31. J. myitkyina Roth, 1999 , male genitalia, dorsal view (after Roth, 1999); 32. J. spinifera ( Princis, 1963) , supra-anal plate, dorsal view (after Roth, 1993); 33. J. spinifera ( Princis, 1963) , median phallomere and accessory median phallomere, dorsal view (after Roth, 1993); 34. J. arca Wang, Jiang & Che, 2009 , supra-anal plate, ventral view (after Wang, Jiang & Che, 2009); 35. J. arca Wang, Jiang & Che, 2009 , median phallomere and accessory median phallomere, dorsal view (after Wang, Jiang & Che, 2009).

Figures

FIGURES 1 – 4. Jacobsonina erebis sp. nov. 1. male, dorsal view; 2. male, ventral view. 3. female, dorsal view; 4. female, ventral view.

FIGURES 5 – 10. Jacobsonina erebis sp. nov. male genitalia. 5. supra-anal plate, ventral view; 6. hypandrium, ventral view; 7. left phallomere and appendage sclerite of left phallomere, dorsal view; 8. median phallomere, dorsal view; 9. appendage sclerite of median phallomere, dorsal view; 10. right phallomere, dorsal view.

FIGURES 11 – 17. Jacobsonina erebis sp. nov. female genitalia. 11. bsv, sp. pl., ventral view; 12. bsv, sp. pl., dorsal view; 13. ltst. sh., vst. s., ventral view; 14. supra-anal plate, ventral view; 15. vlf. Ia, pt., VI, ltst. IX, ventral view; 16. VII, ventral view; 17. a. a, o. s., p. l., intc. s., VIII, ventral view.