Cryptophyllium, Cumming & Bank & Bresseel & Constant & Tirant & Dong & Sonet & Bradler, 2021

Cumming, Royce T., Bank, Sarah, Bresseel, Joachim, Constant, Je ́ ro ̂ me, Tirant, Stephane Le, Dong, Zhiwei, Sonet, Gontran & Bradler, Sven, 2021, Cryptophyllium, the hidden leaf insects - descriptions of a new leaf insect genus and thirteen species from the former celebicum species group (Phasmatodea, Phylliidae), ZooKeys 1018, pp. 1-179 : 1

Cryptophyllium gen. nov.

Type species.

Phyllium celebicum de Haan, 1842: 111, herein designated.

Differentiation.

The only single feature that alone can distinguish Cryptophyllium gen. nov. from others phylliids is the vomer of the males, which has two apical hooks (Fig. 5 ). Grö ßer (2011) was the first to review the vomer morphology across a wide sampling of species and noted that the vomer of males in this group is two-hooked, whereas all other known phylliid males have a singularly hooked vomer. Besides this distinct feature, it is a combination of other features, not a singular feature, which allows differentiation of Cryptophyllium gen. nov. from the other phylliid genera. Morphologically, Cryptophyllium gen. nov. falls within the Phylliini due to the posteromedial tubercle being singular, not split into two lobes (a feature which differentiates Phylliini and Nanophylliini ; Cumming et al. 2020c).

Genera and subgenera included within the Phylliini Brunner von Wattenwyl, 1893 are: Chitoniscus Stål, 1875; Microphyllium Zompro, 2001; Pseudomicrophyllium Cumming, 2017; Phyllium (Phyllium) Illiger, 1798; Phyllium (Pulchriphyllium) Griffini, 1898; Phyllium (Comptaphyllium) Cumming, Le Tirant, & Hennemann, 2019; Phyllium (Walaphyllium) Cumming, Thurman, Youngdale & Le Tirant, 2020, and the herein described Cryptophyllium gen. nov. To differentiate Cryptophyllium gen. nov. from other Phylliini and place it taxonomically we present a key to genera for each sex individually as well as a key to egg morphology.

Figures

Figure 5. Details of the Cryptophyllium gen. nov. male vomer. All from the RBINS collection, prepared and photographed by Jerome Constant (RBINS). Views 1 ventral 2 right lateral of the ventrally oriented vomer 3 left lateral of the ventrally oriented vomer A Cryptophyllium westwoodii comb. nov., Thailand, Na Haeo B Cryptophyllium khmer gen. et sp. nov. Cambodia, Kbal Spean C Cryptophyllium phami gen. et sp. nov., Vietnam, Cat Tien D Cryptophyllium khmer gen. et sp. nov., Cambodia, Tatai E Cryptophyllium bollensi gen. et sp. nov., Vietnam, Phuoc Binh F Cryptophyllium oyae comb. nov., Laos, Mt. Phu Phan G Cryptophyllium bankoi gen. et sp. nov., Vietnam, Ba Na-Nui Chua H Cryptophyllium icarus gen. et sp. nov., Vietnam, Bidoup-Nui Ba I Cryptophyllium rarum comb. nov., Vietnam, Cuc Phuong J Cryptophyllium limogesi gen. et sp. nov., Vietnam, Ta Dung. Scale bars, 1.0 mm.