Neochya, Lee, 2020

Lee, Chi-Feng, 2020, Revision of Taiwanese species of Atrachya Chevrolat, 1836 (Coleoptera, Chrysomelidae, Galerucinae): descriptions of three new genera, two new species, and designations of three new synonyms, ZooKeys 940, pp. 117-159 : 117

publication ID	https://dx.doi.org/10.3897/zookeys.940.51800
publication LSID	lsid:zoobank.org:pub:2FE61B8F-A294-4978-B298-73EC4B9CD11E
persistent identifier	https://treatment.plazi.org/id/A10C4F16-751F-4EC1-B4F0-655AA94D9208
taxon LSID	lsid:zoobank.org:act:A10C4F16-751F-4EC1-B4F0-655AA94D9208
treatment provided by	ZooKeys by Pensoft
scientific name	Neochya
status	gen. nov.

Treatment

Neochya gen. nov.

Type species.

Atrachya hirashimai Kimoto, 1969

Description.

Coloration: extremely variable but without metallic color. Body length 4.6-7.0 mm.

Head. Labrum trapezoidal, transverse, with six pores in transverse row bearing pale setae, anterior margin medially depressed. Anterior part of head very short, almost impunctate and glabrous, several setae on anterior margin of clypeus and anterofrontal ridge. Interantennal space broad, 1.5-2.6 × as wide as diameter of antennal insertion. Frontal tubercles transverse, subtriangular, slightly elevated, glabrous. Vertex smooth and glabrous. Antennae slender, covered with dense setae, antennomere II as long as antennomere III; similar in both sexes.

Pronotum 1.75-2.00 times as broad as long, lateral margins slightly rounded, basally narrowed. Disc covered with dense, coarse punctures, moderately or strongly convex, with lateral depressions, except N. chengi sp. nov. and N. nitidissima . Anterior margin lacking marginal bead, lateral and posterior margins with marginal bead. Anterior and posterior margins without setae, lateral margins with two pairs of setae near base and apex respectively. Anterior angles moderately swollen, rectangular, posterior angles obtuse angulate, all angles with setigerous pore bearing long pale seta.

Scutellum subtriangular, impunctate, glabrous, with rounded apex.

Elytra ca 1.35-1.68 times as long as wide, almost glabrous (with indistinct, sparse, short, pale setae on humeri, lateral margins and apical slopes), parallel sided, except N. nitidissima (Fig. 9 View Figure 9 , broader in middle), covered with densely confused punctures. Humeral calli well developed. Epipleura broad at base, gradually narrowed from basal 1/3, abbreviated near apex (Fig. 19D View Figure 19 ). Macropterous.

Ventral surface sparsely covered with fine punctures and pale setae. Anterior coxal cavities widely open (Fig. 18D View Figure 18 ). Prosternal process not visible between procoxae. Abdomen simple, posterior margin of last ventrite with two long incisions in males.

Legs slender. All tibiae with one apical spine, the longest spine on metatibia. Protarsomeres I not modified in males. Metatarsomeres I much longer than pro- and mesotarsomeres I, much longer than II and III combined. Claws appendiculate.

Penis broad, with one pair of small lateral processes near apex (Figs 8C-E View Figure 8 , 10C-E View Figure 10 , 12C-E View Figure 12 ) (except N. chengi sp. nov. (Fig. 5C-E View Figure 5 )); tectum broad, apical margin truncate; internal sac with only one type of endophallic spiculae (median endophallic spiculae).

Gonocoxae (Figs 5F View Figure 5 , 8F View Figure 8 , 10F View Figure 10 , 12F View Figure 12 ) slender, tightly conjunct medially; each gonocoxa with eight setae from near apex to apical 1/6, subapically widened, apex narrowly rounded, base bifurcate. Ventrite VIII (Figs 5G View Figure 5 , 8G View Figure 8 , 10G View Figure 10 , 12G View Figure 12 ) weakly sclerotized except apex, with several short and long setae at apex, and several long setae at sides, spiculum elongate. Spermathecal receptaculum (Figs 5H View Figure 5 , 8H View Figure 8 , 10H View Figure 10 , 12H View Figure 12 ) as slender as pump, apically tapering; pump slender and curved; sclerotized spermathecal duct extremely elongate, but base wide, followed by short slender tube with inflated areas. Bursal sclerites reduced.

Diagnosis.

Neochya gen. nov. differs from Atrachya Chevrolat and Monolepta Chevrolat in the following combination of characters: antennomere II subequal to III in length (antennomere II much shorter than III in Atrachya (Fig. 3A, B View Figure 3 )); widely open prothoracic coxal cavities (Fig. 18D View Figure 18 ) (closed prothoracic coxal cavities in Taiwanese species of Monolepta , Fig. 18C View Figure 18 ); absence of subscutellar impression on the elytra in males (presence of subscutellar impression on the elytra of Atrachya ); penis with tectum broad and apical margin truncate (Figs 5C View Figure 5 , 8C View Figure 8 , 10C View Figure 10 , 12C View Figure 12 ) (tectum elongate with apex deeply bifurcate in Atrachya (Fig. 3C View Figure 3 )), only one type of endophallic spiculae (Figs 5C-E View Figure 5 , 8C-E View Figure 8 , 10C-E View Figure 10 , 12C-E View Figure 12 ) (three types of endophallic spiculae in Monolepta ); gonocoxae slender and subapically broadened (Figs 5F View Figure 5 , 8F View Figure 8 , 10F View Figure 10 , 12F View Figure 12 ) (gonocoxae broad and parallel-sided in Atrachya (Fig. 3F View Figure 3 )), spermathecae with slender receptaculum as pump (Figs 5H View Figure 5 , 8H View Figure 8 , 10H View Figure 10 , 12H View Figure 12 ) (greatly swollen receptaculum in Atrachya (Fig. 3I View Figure 3 )), with apex acute (without acute apex in Atrachya ); reduced bursal sclerites (well-developed bursal sclerites in Atrachya (one pair (Fig. 3H View Figure 3 )) and Monolepta (two pairs); ventrite VIII with few lateral setae (Figs 5G View Figure 5 , 8G View Figure 8 , 10G View Figure 10 , 12G View Figure 12 ) (dense lateral setae in Atrachya (Fig. 3F View Figure 3 )).