Yukikoa M. Sato 1976
Creators: name: Nakamura, Ryo
name: Kubota, Kôhei
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cantharidae
Yukikoa

description: Key to species of the genus Yukikoa (for males only)
1 Dorsal plate of male genitalia with length more than twice as long as ventral process in lateral view........... Y. onzuiensis
- Dorsal plate of male genitalia with length less than twice as long as ventral process in lateral view..................... 2
2 Dorsal plate of male genitalia with little or shallow incision (of less than 1/5 of the total length of dorsal plate) in the anterior margin.............................................................................................. 3
- Dorsal plate of male genitalia with deep U-shaped or V-shaped incision (of more than 1/5 of the total length of dorsal plate) in the anterior margin.................................................................................... 6
3 Elytra shorter (EL/MEW <1.65, EL/HEW <2.40)........................................................... 4
- Elytra longer (EL/MEW> 1.80, EL/HEW> 2.40)........................................................... 5
4 Dorsal plate of male genitalia with lateral sides somewhat broadened anteriorly; ventral process of male genitalia with its 1/5 length exceeding laterophyse in lateral view; each laterophyse of male genitalia wide in ventral and dorsal view..................................................................................................... Y. maniwana
- Dorsal plate of male genitalia with lateral sides weakly narrowed anteriorly; ventral process of male genitalia not exceeding laterophyse in lateral view; each laterophyse of male genitalia slender in ventral and dorsal view...... Y. mashimai sp. nov.
5 Terminal antennomere shorter than any of the 5 to 9 segments; genitalia elongate; each laterophyse of male genitalia about 3.5 times as long as wide and distantly located in ventral and dorsal view.................................... Y. kanekoi
- Terminal antennomere longer than any of the 5 to 9 segments; genitalia broad; each laterophyse of male genitalia about 2.5 times as long as wide and closely located in ventral and dorsal view....................................... Y. akitai
6 Each laterophyse of male genitalia significantly dilated toward the apex in ventral or dorsal view, with the inner margin approaching toward the apex................................................................... Y. watanabei
- Each laterophyse of male genitalia moderately widened toward the apex in ventral or dorsal view, with the inner margin almost parallel or becoming distant toward the apex................................................................ 7
7 Elytra longer (EL/HEW> 2.70); head and pronotum entirely blackish brown; apex of ventral process of male genitalia with blunt tip............................................................................ Y. nishimotoi sp. nov.
- Elytra shorter (EL/HEW <2.55); head and pronotum reddish brown for the most part; apex of ventral process of male genitalia with sharply pointed tip................................................................................ 8
8 Antennomere 2 not so short, more than 0.7 times as long as 3; dorsal plate of male genitalia with somewhat V-shaped incision ................................................................................................... 9
- Antennomere 2 short, less than 0.66 times as long as 3; dorsal plate of male genitalia with U-shaped incision........... 10
9 Each laterophyses of male genitalia about 2.2 times as long as wide in ventral and dorsal view; ventral process of male genitalia shorter than laterophyse in lateral view; dorsal plate of male genitalia with sharper tip V-shaped incision......... Y. mizunoi
- Each laterophyses of male genitalia about 2.5 times as long as wide in ventral and dorsal view; ventral process of male genitalia as long as laterophyse in lateral view; dorsal plate of male genitalia with rounder tip V-shaped incision.......... Y. wittmeri
10 Laterophyses of male genitalia exceeding the tip of ventral process in lateral view........................ Y. kamezawai
- Laterophyses of male genitalia not reaching the tip of ventral process in lateral view...................... Y. masatakai
description: Published as part of Nakamura, Ryo & Kubota, Kôhei, 2023, Taxonomic study of the Japanese endemic genus Yukikoa M. Satô (Coleoptera, Cantharidae) with descriptions of two new species, pp. 581-589 in Zootaxa 5351 (5) on pages 587-588, DOI: 10.11646/zootaxa.5351.5.6, http://zenodo.org/record/8392372