Nagisavelia Watanabe, Nakajima et Hayashi, 2023

Watanabe, Kohei, Nakajima, Jun & Hayashi, Masakazu, 2023, Nagisavelia hikarui, a new genus and species of Mesoveliinae (Hemiptera: Heteroptera: Mesoveliidae) inhabiting shingle beaches in Japan, Zootaxa 5353 (5), pp. 468-478 : 469

publication ID	https://doi.org/ 10.11646/zootaxa.5353.5.5
publication LSID	lsid:zoobank.org:pub:D35586A6-9BB0-4FDF-AE51-BC1475B346A2
DOI	https://doi.org/10.5281/zenodo.10010395
persistent identifier	https://treatment.plazi.org/id/03D5120F-332C-FFB4-24FA-57CEFDF5F956
treatment provided by	Plazi
scientific name	Nagisavelia Watanabe, Nakajima et Hayashi
status	gen. nov.

Treatment

Nagisavelia Watanabe, Nakajima et Hayashi , gen. nov.

[Japanese name: Nagisa-Mizukamemushi-zoku]

( Figs. 1–8 View FIGURES 1–6 View FIGURES 7–10 , 11–24 View FIGURES 11–14 View FIGURES 15–18 View FIGURES 19–24 )

Type species. Nagisavelia hikarui sp. nov.

Description. Apterous form, small. Head very long; ocelli absent; eyes vestigial, with small ommatidia, located near base of head, with dense setae ( Fig. 21 View FIGURES 19–24 ); antennae long and slender, filamentous, shorter than body, without spines; ventral head very long, weakly carinate ( Fig. 15 View FIGURES 15–18 ); labium long, reaching posterior margin of abdominal sternum II; pronotum broad, posterior margin slightly arched; mesonotum broad, posterior margin slightly arched; metanotum broad, posterior margin straight; without wings; middle thoracic venter with single metasternal scent gland opening; legs slender and long, hind legs longest, spines absent, but hind tibia with weak spines; tarsi with three segments, first segment shortest, third segment longest ( Fig. 22 View FIGURES 19–24 ); lateral abdomen with longitudinal sulcus; male genital segment large, parameres symmetrical; female genital segment large, ovipositor ensiform, both sides moderated middle to apex ( Fig. 17 View FIGURES 15–18 ); gonoplacs large ( Fig. 16 View FIGURES 15–18 ); gynatrial sac small ( Fig. 18 View FIGURES 15–18 ).

Remarks. Nagisavelia gen. nov. can be distinguished from nine of the current mesoveliine genera by its relatively vestigial eyes ( Table 1 View TABLE 1 ; Andersen & Polhemus 1980, 2003; Malipatil & Monteith 1983; Polhemus & Polhemus 1989). Cavaticovelia is similar to Nagisavelia gen. nov. in regard to its very long head, vestigial eyes, filiform antennae, and the long labium which reaches to the middle of the abdomen, but can be distinguished by the following combination of characteristics ( Table 1 View TABLE 1 ): body royal-orange (body yellowish in Cavaticovelia ); antennae shorter than body (antennae longer than body in Cavaticovelia ); antennae without spines (with spines in Cavaticovelia ); eyes with dense hairs ( Fig. 21 View FIGURES 19–24 ) (eyes with two short setae in Cavaticovelia : see Andersen & Polhemus 1980: fig. 47); ventral head weakly carinate ( Fig. 15 View FIGURES 15–18 ) (simple in Cavaticovelia ); legs short (legs very long in Cavaticovelia : see Gagné & Howarth 1975: fig. 1); thoracic segment length I> II> III ( Fig. 19 View FIGURES 19–24 ) (I> III> II in Cavaticovelia ); spines on legs absent but hind tibia weak (weak in Cavaticovelia ); metatarsal segment length III> II> I ( Fig. 22 View FIGURES 19–24 ) (II> III> I in Cavaticovelia ). In East Asia, Speovelia is similar to Nagisavelia gen. nov. but can be distinguished by the following combination of characteristics ( Table 1 View TABLE 1 ): very long head, more than 1.8 times longer than width (less than 1.5 times as long as width in Speovelia ); eyes vestigial ( Fig. 21 View FIGURES 19–24 ) (reduced in Speovelia : Fig. 25 View FIGURES 25–30 ); eyes with dense setae ( Fig. 21 View FIGURES 19–24 ) (with two short setae in Speovelia ); antennae shorter than body (longer than body in Speovelia ); antennae without spines (with spines in Speovelia : Fig. 25 View FIGURES 25–30 ); labium extends to middle of abdomen (to mesocoxae in Speovelia ); ventral head weakly carinate ( Fig. 15 View FIGURES 15–18 ) (simple in Speovelia ); spines on legs absent but hind tibia weak (strong in Speovelia ); metatarsal segment length III> II> I ( Fig. 22 View FIGURES 19–24 ) (II> III> I in Speovelia : Fig. 28 View FIGURES 25–30 ).