Arcofaciella Fennah, 1956

Li, Hong-Xing, Chen, Xiang-Sheng & Yang, Lin, 2021, Review the bamboo-feeding genus Arcofaciella Fennah, 1956 (Hemiptera: Fulgoromorpha: Delphacidae) with description of a new species from India, European Journal of Taxonomy 748 (1), pp. 51-66 : 52-53

publication ID	https://doi.org/ 10.5852/ejt.2021.748.1341
publication LSID	lsid:zoobank.org:pub:E1934A9A-AC29-4B41-84A0-56AF6F18B220
DOI	https://doi.org/10.5281/zenodo.4746327
persistent identifier	https://treatment.plazi.org/id/03F02E5B-4B6D-FFFD-4F65-FA7AC82EF809
treatment provided by	Plazi
scientific name	Arcofaciella Fennah, 1956
status

Treatment

Genus Arcofaciella Fennah, 1956 View in CoL View at ENA

Type species

Arcofaciella verrucosa Fennah, 1956 View in CoL .

Diagnosis

Head including eyes ( Figs 1G View Fig , 2A View Fig , 3G View Fig , 4A View Fig , 5G View Fig , 6A View Fig ) as wide as or wider than pronotum. Vertex ( Figs 1G View Fig , 2A View Fig , 3G View Fig , 4A View Fig , 5G View Fig , 6A View Fig ) short, trapezoidal; anterior margin transverse, carinate, somewhat incised medially at areolet; posterior margin transverse; lateral margins concave. Frons ( Figs 1H View Fig , 2C View Fig , 3H View Fig , 4C View Fig , 5H View Fig , 6C View Fig ) at midline longer than wide at widest part, widest above level of ocelli; lateral margins convex; median carina forked at fastigium, areolet weakly depressed. Postclypeus ( Figs 2B–C View Fig , 4B–C View Fig , 6B–C View Fig ) in lateral view more or less at right angle or obtuse angle to base of frons; in ventral view lateral carinae straight, converging to labrum, median carina absent or present. Rostrum with apex reaching mesotrochanters. Antennae ( Figs 1H View Fig , 2C View Fig , 3H View Fig , 4C View Fig , 5H View Fig , 6C View Fig ) cylindrical, short, stout, second segment markedly longer than first segment, but both together not exceeding length of eye. Pronotum ( Figs 1G View Fig , 2A View Fig , 3G View Fig , 4A View Fig , 5G View Fig , 6A View Fig ) subequal or longer than vertex along midline, sloping anteriorly and laterally; anteriorly shallowly convex, posteriorly shallowly excavate; median carina distinct, lateral carinae developed only in anterior portion in line with lateral margins of vertex; disc with two pits on each side of median carina. Mesonotum ( Figs 1G View Fig , 2A View Fig , 3G View Fig , 4A View Fig , 5G View Fig , 6A View Fig ) strongly convex, almost gibbous, strongly sloping laterally and posteriorly, disc tricarinate with lateral carinae feeble. Mesoscutellum ( Figs 1G View Fig , 2A View Fig , 3G View Fig , 4A View Fig , 5G View Fig , 6A View Fig ) distinctly depressed, horizontal, median line of scutum obsolete posteriorly, but present on scutellum, with a distinct groove between scutum and scutellum. Forewings ( Figs 2D View Fig , 4D View Fig , 6D View Fig ) long, corium enfolding abdomen at region of node, costal margin sinuate, concave distad of node, apical margin shallowly undulate, forks of ScP-R and CuA distad of union of claval veins. Legs relatively short and stout, profemora shorter than procoxae (e.g., Figs 1F View Fig , 3F View Fig , 5C View Fig ), hind tibiae with two lateral spines (one very small at base, the other large at about one third from apex) ( Fig. 1F View Fig ) and five teeth at apex; hind tarsomere I with 7, 8 or 9 small even teeth at apex, hind tarsomere II with 5 apical teeth. Anal segment of male ( Figs 2E View Fig , 4E View Fig , 6E View Fig ) in caudal view ring-like, lateroapical angles weakly protruding caudad or not produced. Pygofer ( Figs 2G View Fig , 4H View Fig , 6G View Fig ) without medioventral process. Genital styles ( Figs 2H–J View Fig , 4I–J View Fig , 6H–I View Fig ) long. Aedeagus ( Figs 2K–M View Fig , 4K–L View Fig , 6J–K View Fig ) with phallotheca. Aedeagus tubular, apical part recurved downward. Phallotheca with valvular process, basal ⅔ quadrate.

Remarks

This genus is similar to Arcofacies Muir, 1915 but differs from it by: frons with lateral margins distinctly arched ( Figs 1H View Fig , 2C View Fig , 3H View Fig , 4C View Fig , 5H View Fig , 6C View Fig ) (vs frons with lateral margins subparallel in Arcofacies ( Chen et al. 2007: figs 2, 11, 19, 25)); antennae short, obviously not reaching frontoclypeal suture ( Figs 1H View Fig , 2C View Fig , 3H View Fig , 4C View Fig , 5H View Fig , 6C View Fig ) (vs antennae long, nearly reaching or surpassing frontoclypeal suture in Arcofacies ( Chen et al. 2007: figs 2, 11, 19, 25)); pronotum with lateral carinae not extending to hind margin ( Figs 1G View Fig , 2A View Fig , 3G View Fig , 4A View Fig , 5G View Fig , 6A View Fig ) (vs pronotum with lateral carinae extending to hind margin in Arcofacies ( Chen et al. 2007: figs 1, 10, 18, 24)); spinal formula of hind leg 5-8-5 or 5-9-5 (vs spinal formula of hind leg 5-6- 4 in Arcofacies ).

Host plant

Bambusoideae Luerss.

Distribution

Oriental region ( China, Malay Peninsula, India).

Key to species (males) of Arcofaciella Fennah, 1956

1. Frons in profile inclined anteriorly ( Figs 3I View Fig , 4B View Fig , 5I View Fig , 6B View Fig ); clypeus in profile bent at right angle to frons ( Figs 3I View Fig , 4B View Fig , 5I View Fig , 6B View Fig ), with median carina absent ( Figs 4C View Fig , 6C View Fig ) ....................................................... 2

– Frons in profile not inclined anteriorly ( Figs 1I View Fig , 2B View Fig ); clypeus in profile bent at obtuse angle to frons ( Figs 1I View Fig , 2B View Fig ), with median carina present ( Fig. 2C View Fig ) ............................................. A. indiana View in CoL sp. nov.

2. Genital styles in posterior view with an angled process medioventrally ( Fig. 4I View Fig ) ............................. ........................................................................................................... A. obflexa Guo & Liang, 2005 View in CoL

– Genital styles in posterior view without angled process medioventrally ( Fig. 6H View Fig ) ......................... 3

3. Genital styles in posterior view with hamular process at inner apical laterally ( Fig. 6H View Fig ) .................. .................................................................................................................. A. verrucosa Fennah, 1956 View in CoL

– Genital styles in posterior view with quadrate process at inner apical laterally ................................. ............................................................................................................... A. penangensis ( Muir, 1919) View in CoL