Tsouchya, 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

Tsouchya gen. nov.

Type species.

Atrachya mediofasciata Kimoto, 1976.

Description.

Color extremely variable (Fig. 13 ) but without metallic color (see remarks of Tsouchya mediofasciata ). Body length 4.5-6.0 mm.

Head. Labrum trapezoidal, transverse, with six pores in transverse row bearing pale seta, anterior margin truncate. Anterior part of head short, almost impunctate and glabrous, four setae on anterior margin of clypeus and several setae along anterior margin of anterofrontal ridge. Interantennal space narrow, 1.0-1.2 × as wide as diameter of antennal insertion. Frontal tubercles transverse, slightly reduced, glabrous. Vertex smooth and glabrous. Antennae slender, covered with dense setae, antennomere II much shorter than antennomere III (0.61-0.68 × as long as III); similar in both sexes (Fig. 14A, B ).

Pronotum 1.52-1.56 times as broad as long, lateral margins straight, basally narrowed. Disc covered with dense coarse punctures, moderately convex. Posterior half of disc with wide shallow transverse impression. 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 pores bearing long pale setae.

Scutellum subtriangular, impunctate, glabrous, with rounded apex.

Elytra 1.55-1.61 times as long as wide, almost glabrous (with indistinct, sparse, short, pale setae on humeri, lateral margins and apical slopes), parallel-sided, densely covered with coarse confused punctures. Humeral calli well developed. Epipleura broad at base, strongly narrowed at basal 1/3, abbreviated from apical 1/3 to apex. Macropterous.

Ventral surface sparsely covered with fine punctures and pale setae. Anterior coxal cavities closed (Fig. 18F ). 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 (Fig. 14C-E ) broad, without lateral processes; tectum elongate, apical margin truncate, with one pair of apically tapering sclerites articulated with lateral margins; internal sac with two types of endophallic spiculae (median and apical endophallic spiculae); with one rounded sclerite projecting from ventral surface.

Gonocoxae (Fig. 14G ) slender, tightly conjunct medially; each gonocoxa with eight setae from near apex to apical 1/6, subapically widened, apex narrowly rounded. Ventrite VIII (Fig. 14F ) weakly sclerotized except apex, with several short and long setae at apex, and several long setae at sides, spiculum elongate. Spermathecal receptaculum (Fig. 14I ) strongly swollen; pump slender and curved; sclerotized spermathecal duct extremely elongate, but base wide, followed by short slender tube, then with inflated areas. Bursal sclerites (Fig. 14H ) paired, circular, with three or four teeth at one side.

Diagnosis.

Tsouchya gen. nov. differs from Neochya gen. nov., Monolepta Chevrolat and Atrachya Chevrolat based on the following combination of characters: antennomere II much short than III in length (Fig. 14A, B ) (antennomere II subequal to III in Neochya gen. nov. (Figs 5A, B , 8A, B , 10A, B , 12A, B ) and Monolepta ); closed prothoracic coxal cavities (Fig. 18F ) (open prothoracic coxal cavities in Atrachya (Fig. 18A ) and Neochya gen. nov. (Fig. 18D )); absence of subscutellar impression on the elytra in males (presence of subscutellar impression on the elytra in those of Atrachya ); penis without lateral processes near apex (Fig. 14C-E ) (with lateral processes in Neochya gen. nov. (Figs 8C-E , 10C-E , 12C-E ); tectum broad and with apical margin truncate (Fig. 14C ) (tectum elongate with apex deeply bifurcate in Atrachya (Fig. 3C )), with one pair of lateral sclerites (Fig. 14C ) (lacking lateral sclerites in others); two types of endophallic spiculae (Fig. 14C ) (only one type of endophallic spiculae in Neochya gen. nov. (Figs 5C-E , 8C-E , 10C-E , 12C-E ; three types of endophallic spiculae in Monolepta ); spermatheca with strongly swollen receptaculum (Fig. 14I ) (slender receptaculum in Neochya gen. nov. (Figs 5H , 8H , 10H , 12H )), without acute apex (with acute apex in Neochya gen. nov.); one pair of bursal sclerites (Fig. 14H ) (two pairs of bursal sclerites in Monolepta ; reduced in Neochya gen. nov.), circular and flattened (slender in others); ventrite VIII with few setae at sides (dense setae at sides in Atrachya (Fig. 3F )).

Etymology.

Composed from Tsou and Atrachya to honor Mei-Hua Tsou, who is a member of TCRT (Taiwan Chrysomelid Research Team) and made great contributions to inventorying the chrysomelid fauna in Taiwan. The gender is feminine.

Included species.

Tsouchya mediofasciata (Kimoto), comb. nov.

Figures

Figure 3. Diagnostic characters of Atrachya menetriesii A antenna, male B antenna, female C aedeagus, dorsal view D aedeagus, lateral view E aedeagus, ventral view F abdominal ventrite VIII G gonocoxae H bursal sclerites I spermatheca.

Figure 5. Diagnostic characters of Neochya chengi sp. nov. A antenna, male B antenna, female C aedeagus, dorsal view D aedeagus, lateral view E aedeagus, ventral view F gonocoxae G abdominal ventrite VIII H spermatheca.

Figure 8. Diagnostic characters of Neochya hirashimai A antenna, male B antenna, female C aedeagus, dorsal view D aedeagus, lateral view E aedeagus, ventral view F gonocoxae G abdominal ventrite VIII H spermatheca.

Figure 10. Diagnostic characters of Neochya nitidissima A antenna, male B antenna, female C aedeagus, dorsal view D aedeagus, lateral view E aedeagus, ventral view F gonocoxae G abdominal ventrite VIII H spermatheca.

Figure 12. Diagnostic characters of Neochya tsoui sp. nov. A antenna, male B antenna, female C aedeagus, dorsal view D aedeagus, lateral view E aedeagus, ventral view F gonocoxae G abdominal ventrite VIII H spermatheca.

Figure 13. Habitus of Tsouchya mediofasciata A female, from Shihshan trail (石山林道), dorsal view B male, from Lilungshan (里龍山), dorsal view C same, ventral view D female, from Lilungshan (里龍山), dorsal view view E male, from Shihshan trail (石山林道), dorsal view F female, from Shihshan trail (石山林道), dorsal view G same, dorsal view H male, from Talu trail (大鹿林道), dorsal view I female, from Meifeng (梅峰), dorsal view.

Figure 14. Diagnostic characters of Tsouchya mediofasciata A antenna, male B antenna, female C aedeagus, dorsal view D aedeagus, lateral view E aedeagus, ventral view F abdominal ventrite VIII G gonocoxae H bursal sclerites I spermatheca.

Figure 18. Prothorax, ventral view A Atrachya menetriesii B Chinochya unifasciata C Monolepta gracilipes D Neochya nitidissima E Paleosepharia formosana F Tsouchya mediofasciata.