Sikkimia yuae, Lee, Chi-Feng & Bezdek, Jan, 2016

Lee, Chi-Feng & Bezdek, Jan, 2016, Revision of the wingless Sikkimia Duvivier (Coleoptera, Chrysomelidae, Galerucinae) from Taiwan, including a new generic synonymy and four new species descriptions, ZooKeys 553, pp. 79-106 : 95-98

Taxon classification Animalia Coleoptera Chrysomelidae

Sikkimia yuae sp. n. Figs 33-35, 50, 84-90

Type locality.

Taiwan: Kaoshiung county, Chungchihkung (中之關), 23°17'10"N, 120°53'51"E, 2300 m.

Type material

(n= 16). Holotype ♂: Kaoshiung: Chungchihkung (中之關), 10.VI.2015, leg. C.-F. Lee. Paratypes: 5♂♂, 7♀♀, same data as holotype (2♂♂, 2♀♀ in JBCB); 1♂, 2♀♀, Taoyuan (桃源= Chungchihkung), 1.VII.2009, leg. S.-F. Yu.

Description

Male. Length 7.1-7.5 mm; width 3.9-4.1 mm. Coloration reddish-brown, head dark brown, legs and antennae black. Antenna (Fig. 84) long, about long as body; antennomeres I to VII filiform; VIII and IX slightly widened; × and XI extremely swollen (Figs 33-35, 45 –47),× with deep groove from middle to apex of mesal surface, apex of XI pointed, moderately concave in apical 1/3 of mesal surface and in basal 1/4 of outer surface, dorsal surface with two longitudinal ridges, one close to mesal margin extending from basal ¼ to apical 1/3, other longitudinal ridge along mesal margin from basal ¼ to the middle, deep groove between longitudinal ridges, transverse groove near base; length ratio of antennomeres II to XI about 1.0: 1.3: 1.5: 1.5: 1.6: 1.6: 1.5: 1.6: 2.5: 3.1, length to width ratios of antennomeres II to XI about 1.8: 1.8: 2.4: 2.2: 2.3: 2.3: 2.1: 2.0: 2.7: 2.7. Pronotum transverse, 1.6 × wider than long; anterior and posterior margins sinuate, weakly concave medially; lateral bordermargin weakly rounded; disc with fine scattered punctures. Elytra narrow, about 1.2 × longer than wide; punctuate densely, reduced humeri, lateral margin rounded, widest just posterior of the middle. Abdominal ventrite V trilobed, internal anterior margin extended, reaching ventrite III; median longitudinal, internal ridge running from base to apex of extension. Abdominal tergite I with only spiracles sclerotized; II-V with spiracles sclerotized and transverse weakly sclerotized areas; most of VI and spiracles strongly sclerotized; whole of VII strongly sclerotized. Aedeagus (Figs 86-87) wide in dorsal view, about 4.8 × longer than wide, base shallowly incised medially; greatest width in basal 1/3, narrowing slightly towards apical 1/3, widening slightly subapically before the subtriangular apex with a pointed tip; ventral disc well sclerotized and smooth; aedeagus wide and moderately curved in lateral view; endophallic sclerite longitudinal and slender, bifurcate apically, about 0.4 × as long as aedeagus.

Female. Length 7.8-8.2 mm; width 5.3-5.6 mm. Similar to male, but underside dark brown; antenna (Fig. 85) filiform, antennomeres× and XI not swollen; length ratio of antennomeres II to XI about 1.0: 1.2: 1.9: 1.8: 1.9: 1.9: 1.7: 1.9: 2.1: 2.6, and length to width ratios of II to XI about 2.0: 2.0: 3.2: 3.4: 3.5: 3.4: 3.3: 3.5: 4.8: 4.3. Elytra wider than in male, length and width the same. Gonocoxae (Fig. 88) slender, about 4.4 × longer than wide, joined from base to just before middle, apices tubular, straight and subparallel, with 9-10 apical setae, base rounded and slightly narrower than greatest width at middle, narrowing slightly at basal 1/3. Ventrite VIII (Fig. 89) with extremely long spiculum; apex very small and oval in shape, weakly sclerotized basally, disc with long scattered setae. Abdominal tergites I–III membranous with only the spiracles sclerotized, IV–VII entirely and strongly sclerotized. Receptacle of spermatheca (Fig. 90) slightly swollen, pump short and moderately curved, spermathecal duct wide and long.

Diagnosis.

This new species can be distinguished from others by the following combination of characters: apical 1/3 of aedeagus narrowing slightly before widening slightly again subapically (aedeagus parallel in Sikkimia babai and widening basally in Sikkimia sufangae sp. n. and Sikkimia meihuai sp. n.), and straight subparallel apices of gonocoxae (curved apices of gonocoxae in Sikkimia meihuai sp. n., Sikkimia babai , and Sikkimia sufangae sp. n.).

Host plant.

Polygonum chinense L. ( Polygonaceae ).

Etymology.

This new species is named after Mrs. Su-Fang Yu, who is a member of TCRT and the first person to collect this new species.

Distribution.

West half of South Cross-Island Highway (南橫公路) (Fig. 50).