Pterostichus ( Morphohaptoderus ) xuanzhang, Wu & Chen & Shi, 2025
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publication ID |
https://doi.org/10.3897/dez.72.159716 |
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publication LSID |
lsid:zoobank.org:pub:4E7218B5-5027-4D89-BB17-6E60CEF7FE7E |
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DOI |
https://doi.org/10.5281/zenodo.17804956 |
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persistent identifier |
https://treatment.plazi.org/id/AC79F1DA-4BC8-57CD-8200-130F086496D7 |
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treatment provided by |
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scientific name |
Pterostichus ( Morphohaptoderus ) xuanzhang |
| status |
sp. nov. |
[12] Pterostichus ( Morphohaptoderus) xuanzhang sp. nov.
Figs 4 F View Figure 4 , 5 H View Figure 5 , 24 View Figure 24
Type material.
Holotype: Hubei • ♂, labeled “ Shennongjia, Badongya , 2700 m, 1980. VII. 23, Peiyu Yu leg. ” [in Chinese] ( IZAS) . Paratypes (a total of 1 ♂ and 3 ♀): Hubei • 1 ♂, 1 ♀, the same data as holotype ( IZAS) ; • 1 ♀, labeled “ Jinhouling , Shennongjia, Hubei prov. 4. VIII. 2002, Li & Tang leg. ” ( IZAS) ; • 1 ♀, labeled “ Hubei, Shennongjia, Jiuhuping , 1800–1950 m, N 31.5085, E 110.3485, 2025. IV. 5, Yifan Wang lgt. ” ( CBFU) GoogleMaps .
Diagnosis.
Medium-small-sized species for the subgenus ( BL = 7.7–8.3 mm); elytra with linear microsculpture in both sexes; antennomere 3 without accessory seta; pronotum nearly quadrate, lateral margins subparalleled behind middle; outer sulcus of pronotal basal fovea verticle to posterior margin of pronotum; elytral interval 3 with three setigerous pores, the basal one adjacent to stria 3, the other two adjacent to stria 2; fifth tarsomeres with 2–3 pairs of setae ventrally; male sternites simple; apical lamella of aedeagus small, slightly capitate, apex rounded in lateral view.
Comparisons.
The new species is only similar to P. toledanoi for their specific elytral chaetotaxy. These two species are very difficult distinguished by external characters but have distinct differences on the male genitalia. Their differences are explicated as follows: (1) In P. xuanzhang sp. nov., the outer sulcus of pronotal basal fovea nearly vertical to the posterior margin of pronotum, forming a right angle to posterior margin (Fig. 4 F View Figure 4 ); whereas in P. toledanoi , the outer sulcus distinctly oblique to the posterior margin of pronotum, forming an acute angle at about 75 ° to posterior margin (Fig. 4 E View Figure 4 ). (2) In P. xuanzhang sp. nov., the pronotum posterior margin generally slightly less concaved at middle than in P. toledanoi . (3) In the aedeagus of P. xuanzhang sp. nov., the ventral surface of median lobe with two short ridges that interlaced with each other near middle portion (Fig. 24 B View Figure 24 ); conversely, in P. toledanoi , the ventral surface with one straight long ridge extended from aedeagal base to nearly apex of apical lamella (Fig. 23 B View Figure 23 ). (4) The apical lamella of P. xuanzhang sp. nov. much less capitate with apex small and rounded in lateral view (Fig. 24 A View Figure 24 ); but in P. toledanoi , the apical lamella strongly capitate with apex large and truncated in lateral view (Fig. 23 A View Figure 23 ).
Description.
BL = 7.7–8.3 mm, BW = 3.0– 3.2 mm; dorsal surface dark brown to black, appendages brown; elytra with linear microsculpture in both sexes (Fig. 24 E, F View Figure 24 ).
Head slightly thickened, HW / PW = 0.57–0.58; frons without puncture; frontal sulci short and shallow; antennae reaching elytral basal sixth, antennomere 3 without accessory seta; eyes relatively large, tempora swollen behind eyes, about one-third length of eyes, eyL / tpL = 3.10–3.50; submentum with one seta on each side.
Pronotum subquadrate, wider than length, PW / PL = 1.37–1.40, widest near middle; posterior margin wide and moderately concaved at middle, slightly narrower than greatest width, PBW / PW = 0.81–0.82. Anterior margin slightly concaved at middle, distinctly narrower than posterior margin, PAW / PBW = 0.74–0.76; anterior angles broadly rounded, weakly projecting; lateral margins slightly arched along anterior two-thirds, nearly straight along basal third, very faintly sinuate before posterior angles, posterior angles nearly right-angled, without projecting denticle. Basal foveae (Fig. 4 F View Figure 4 ) usually without puncture, at most sporadically punctate along inner sulcus; inner and outer sulci both with well-defined boundaries; inner sulcus straight; outer sulcus a little more than half length of inner sulcus, nearly vertical to posterior margin of pronotum, forming a right angle to posterior margin; intersulcate area weakly convex; area between lateral margin and outer sulcus shallowly convex; lateral channels very narrow, without puncture. Pronotal disc without wrinkles aside median line; median line shallow; basal median area without puncture.
Elytra oblong and flat, lateral sides nearly parallel, faintly expanded near middle, BW / EL = 0.65–0.70. Elytral basal border nearly straight, slightly curved near shoulder, forming a distinct obtuse angle with lateral margin, humeral tooth small but distinct, apex faintly pointed; striae deeply incised, impunctate; parascutellar striole joined to apical portion of stria 1, angular base of stria 1 short with free apex (Fig. 4 F View Figure 4 ). Parascutellar pore present; interval 3 with three setigerous pores, the first one adjacent to stria 3, the other two adjacent to stria 2; the first pore near basal fourth of elytra, the second one near middle, and the last one near apical fourth; umbilical pore series on ninth interval sparse in middle, composed of 15–16 pores (5–6, 2–3, 7–8).
Male profemora slightly thicker than in females; fifth tarsomeres with 2–3 pairs of setae ventrally.
Male sternite without secondary sexual modification, apex of sternite VII evenly rounded.
Median lobe of aedeagus (Fig. 24 A View Figure 24 ) stouter than the previous species; in lateral view, ventral margin gradually curved at basal third, apex slightly bent ventrally; apical orifice small, weakly turned to left side. Ventral surface with two interlaced ridges (Fig. 24 B View Figure 24 ): the left ridge short, extended from aedeagal base to near basal third of ventral margin; the right ridge longer and stronger, started before the end of left ridge, slightly sinuate and extended to the middle of apical orifice; these two ridges shortly interlaced near basal third of median lobe. Apical lamella thick and capitate, slightly bent upward, in lateral view, extreme apex small and rounded, not hooked; in dorsal view, apical lamella relatively short, length less than basal width ( AL / AW = 0.59–0.61). Right paramere short, apex rounded (Fig. 24 D View Figure 24 ).
Endophallus of male genitalia not studied. Gonocoxite 2 of female ovipositor relatively small, slightly crescent-shaped (Fig. 5 H View Figure 5 ), distinctly obtuse apically; outer margin with two ensiform setae of normal size, length of the largest ensiform seta ca. 0.04 mm; dorsal margin with one ensiform seta near basal third, ridged between the ensiform seta and apex of gonocoxite 2, one nematiform seta located on the apical ninth of outer surface.
Distribution.
This species is only known from Shennongjia, Hubei Province. It is distributed at mid-high altitudes of about 1800–2700 m.
Etymology.
The scientific name of the new species is derived from Qu Yuan’s work “ Huai Sha ”: 玄文处幽兮 [Xuan Wen Chu You Xi], 蒙瞍谓之不章 [Meng Sou Wei Zhi Bu Zhang]. This couplet can be translated as: If delicate black carvings were placed in the darkness, they would remain unseen by the obtuse. This implies that Qu Yuan’s talent was not appreciated by others. Xuanzhang (玄章) refers to the delicate black carvings. The name xuanzhang is appropriate for a Pterostichus species, because these beetles are almost always black-colored with an elegant structure. The name is treated as a noun in apposition.
| IZAS |
Institut Zoologii Akademii Nauk Ukraini - Institute of Zoology of the Academy of Sciences of Ukraine |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Order |
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Family |
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Tribe |
Pterostichini |
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SubTribe |
Pterostichina |
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SubGenus |
Morphohaptoderus |