Cangshanaltica guanxiensis, Damaška & Ruan & Fikáček, 2022

Damaška, Albert František, Ruan, Yongying & Fikáček, Martin, 2022, The genus Cangshanaltica (Coleoptera: Chrysomelidae: Alticinae): overview, new species, and notes on species complexes, Zootaxa 5219 (1), pp. 49-64 : 54-55

Cangshanaltica guanxiensis sp. nov.

Figs 4 , 8C

Type locality: China, Guanxi, Panxie Gou.

Type material. HOLOTYPE (male, NMPC): (1) CHINA: Guangxi, Pangxie Gou , 1.3 km S of Longsheng Hot Spring, 25°53.0′N 110°12.6′E, 385 m 13.iv.2013, Fikáček, Hájek & Růžička lgt. (2) sifting of leaf litter and leaf accumulations along stony stream in evergreen lowland subtropical forest [sifting sample 13]; (3) VOUCHER SPECIMEN DNA collection No. AFD-125 Albert F. Damaška coll.

Differential diagnosis. The species can be distinguished from all other known Cangshanaltica species by its coloration—elytra ochraceous with one darkened spot in the center of each elytron.

DNA sequences. 18S: MZ312403.1; 16S: MZ312387.1; Cox1: MZ303694.1, MZ220536.1 (barcode). All sequences were published by Damaška et al., 2021.

Description.

Habitus. Body round, convex, 2 mm long, 1.7 mm wide, 0.9 mm high. Dorsal and ventral surfaces ochrebrown, each elytron with a darkened spot in the middle.

Head. Nearly hypognathous, triangular. Labrum and clypeus blackish brown, vertex brown.Frontal ridge absent; frons shiny, impunctate, with bunches of setae below antennae. Frontal calli nearly absent. Suprafrontal sulcus shallow, orbital and supraorbital sulci developed. Eyes round. Antennae reaching basal 1/3 of elytra. Antennomeres I–VI and XI light brown, antennomeres V–X darkened. Antennomeres I and II bulbose, wide; antennomeres VII–XI elongate, as long or longer as antennomeres III and IV combined.Antennomere VII bearing a slight distal protrusion.

Thorax. Pronotum brownish ochraceous, wide, convex, impunctate. Anterior margins of pronotum lobate, projecting, forming distinct “flap-like” structures towards head; posterior pronotal edges dull. Anterolateral pronotal setiferous pore placed in the middle of lateral pronotal margin. Elytra convex, brownish ochraceous with a darkened spot in the central part of each elytron, irregularly punctured. Epipleura distinctly widened in basal part. Anterior metaventral process completely covering the mesoventrite between mesocoxae, as a sharply pentagonal, deeply excavated “horseshoe-like” structure. Legs brownish ochraceous. Metatibiae slightly curved, apical metatibial spine short. Metatarsomere I slightly elongated.

Abdomen. Abdominal ventrite I longer than ventrite II, but not as long as ventrites II and III combined.Anterior process of abdominal ventrite I reaching space between metacoxae, bulbose, forming a sharp, ventrally projecting elevated ridge.

Genitalia. Median lobe of aedeagus long but wide, parallel-sided in dorsal view, slightly curved in lateral view. Apex dull, slightly widening posteriorly. Female unknown.

Remarks. The only known specimen is apparently not fully sclerotized—the coloration of a mature adult is probably somewhat darker. Despite that, we are describing the species, as all morphological characters are welldeveloped, and available DNA markers clearly indicate its isolated phylogenetic position among other studied Cangshanaltica species ( Damaška et al. 2021).

Etymology. The species name is derived from Guanxi, the name of the Chinese province where the holotype was collected.

Figures

FIGURE 4. Cangshanaltica guanxiensis. A—dorsal view; B—lateral view; C—ventral view, D—median lobe of aedeagus from dorsal view; E—median lobe of aedeagus from lateral view, F—median lobe of aedeagus from ventral view.

FIGURE 8. Lateral margin of pronotum with the setiferous pore placed almost in the middle—a diagnostic character shared by all known Cangshanaltica species (marked by white arrow in every picture): A—C. castanea; B—C. fuanensis; C—C. guanxiensis; D—C. javana; E—C. luzonica; F—C. marginata; G—C. mindanaoensis; H—C. nigra; I—C. siamensis; J—C. sprynari;, K—C. sp. from Taiwan similar to C. ogatai; L—Ivalia viridipennis with the setiferous pore placed in the apical part of pronotal margin.