Sphaeroderma hsui, Lee, 2023

Lee, Chi-Feng, 2023, Four new species of Sphaeroderma Stephens (Coleoptera, Chrysomelidae, Galerucinae, Alticini) from Taiwan, with discussion on genus boundaries based on S. flavonotatum Chujo and S. jungchani sp. nov., ZooKeys 1185, pp. 1-19 : 1

publication ID	https://dx.doi.org/10.3897/zookeys.1185.112099
publication LSID	lsid:zoobank.org:pub:5B12796B-2102-4994-8D33-53FAD1A1B763
persistent identifier	https://treatment.plazi.org/id/510555F9-6ABE-4D34-9789-0D27E498F030
taxon LSID	lsid:zoobank.org:act:510555F9-6ABE-4D34-9789-0D27E498F030
treatment provided by	ZooKeys by Pensoft
scientific name	Sphaeroderma hsui
status	sp. nov.

Treatment

Sphaeroderma hsui sp. nov.

Figs 2A View Figure 2 , 3 View Figure 3 , 4 View Figure 4

Types.

Holotype ♂ (TARI). Taiwan: Miaoli, Hsiaopangchih (小胖池), 28.VIII.2021-16.XI.2021, leg. Y.-F. Hsu. Paratypes. 29♂, 22♀ (TARI: 26♂, 19♀; BMNH: 3♂, 3♀), same data as holotype; 4♂, 2♀ (TARI), same but with “28.VIII.2021”; 2♂, 3♀ (TARI), same but with “21.V.-28.VIII.2021”; 1♀ (TARI): Hsishihshan (西勢山), 16.XI.2021-21.IV.2022, leg. Y.-F. Hsu.

Description.

Length 2.5-2.8 mm, width 1.6-1.9 mm. Body color (Fig. 3A-C View Figure 3 ) yellowish-brown. Antennae filiform in males (Fig. 4A View Figure 4 ), antennomeres VIII-X wider, length ratios of antennomeres I-XI 1.0:0.6:0.4:0.5:0.7:0.6:0.7:0.8:0.7:0.7:1.0, length to width ratios of antennomeres I-XI 2.9:2.1:1.8:2.0:2.5:2.4:2.5:2.6:2.3:2.3:3.0; similar shape in females (Fig. 4B View Figure 4 ), but antennomeres VIII-X narrower, length ratios of antennomeres I-XI 1.0:0.6:0.4:0.5:0.8:0.6:0.8:0.7:0.7:0.7:1.0, length to width ratios of antennomeres I-XI 3.1:2.3:1.9:2.2:3.2:2.6:2.9:2.5:2.4:2.2:3.3. Antennal calli longitudinal, with supracallinal sulci poorly delimited. Pronotum 1.7-1.9 × wider than long, disc with fine, scattered punctures, same size as punctures on elytra; lateral margins almost straight; anterolateral callosity protruding forward; posterolateral callosity poorly developed. Elytra 1.3 times longer than wide, sides widely rounded; disc with punctures entirely confused; humeral calli well developed. Abdominal ventrite V without internal median ridge in both sexes. Male genitalia: aedeagus (Fig. 4C, D View Figure 4 ) slender in dorsal view, 4.0 × longer than wide; parallel-sided, but slightly narrowed at apical 1/4, apex widely rounded; moderately curved at middle in lateral view, apex slightly recurved, ventral margin with densely, tiny teeth at middle; ostium membranous and with Y-shaped sclerotized area. Female genitalia: ventrite VIII (Fig. 4E View Figure 4 ) with apical part triangular, apical margin smooth and lacking setae, disc with medial part membranous, spiculum short; gonocoxae (Fig. 4G View Figure 4 ) separated, transversely triangular, with dense, long setae along apical margins, with one slender and transverse basal sclerite; receptacle of spermatheca (Fig. 4F View Figure 4 ) moderately swollen; pump short and strongly curved, transverse wrinkles present on entire pump and extending into half of receptacle; sclerotized proximal spermathecal duct long, with ramus oblong.

Color variation.

Some adults have black bodies (Fig. 3D-F View Figure 3 ) with legs and antennae that are yellowish-brown, with metafemora darkener; some adults (Fig. 3G-I View Figure 3 ) similar in this color form, but the elytra are yellowish-brown except darker base that extends to lateral margins, then abbreviated at apical 1/3.

Diagnosis.

Although adults of Sphaeroderma hsui sp. nov. display diverse color patterns (Fig. 3 View Figure 3 ), they are characteristic and diagnostic. In addition, this new species differs from the two other Taiwanese species ( S. changi sp. nov. and S. sheipaensis sp. nov.) based the following combination characters: entire yellowish-brown antennae (Fig. 3 View Figure 3 ) [yellowish-brown antennomeres I-IV and black antennomeres V-XI in other species (Fig. 5 View Figure 5 )]; longitudinal antennal calli with poorly delimited supracallinal sulci (Fig. 2A View Figure 2 ) [transverse antennal calli with well-developed supracallinal sulci in S. changi sp. nov. (Fig. 2B View Figure 2 ) and S. sheipaensis sp. nov. (Fig. 2C View Figure 2 )]; slender aedeagus, 4.0 × longer than wide, with cluster of setae at middle of inner margin in lateral view (Fig. 4D View Figure 4 ) [wide aedeagus, 3.1 × longer than wide, and inner margin lacking setae in lateral view in S. changi sp. nov. (Fig. 6D View Figure 6 )]; triangular abdominal ventrite VIII in females with apical margin lacking setae, subapically and moderately narrowed sides (Fig. 4E View Figure 4 ) [apical margin with seven pairs of setae at medial part in S. changi sp. nov. (Fig. 6E View Figure 6 ), subapically and slightly narrowed sides in S. changi sp. nov. and S. sheipaensis sp. nov. (Figs 6E View Figure 6 , 7E View Figure 7 )]; transversely triangular gonocoxae (Fig. 4G View Figure 4 ) [longitudinally triangular gonocoxae in S. changi sp. nov. (Fig. 6G View Figure 6 )].