Pycanum Amyot & Serville, 1843

list of species :

Pycanum alternatum (Lepeletier & Serville, 1828) type species

Distribution: Borneo, Myanmar, China (Yunnan), E. Indies, India (Hindustan), Indo-China, Indonesia (Bangka I., Belitung I., Nias I.), Java, Malay Penninsula, Moluccas, Philippines, Sumatra, Vietnam.

Pycanum griseum ✝︎ Piton, 1940

Distribution: France.

Pycanum occidentale Ghate, More & Magnien, 2020

Distribution: India (Maharashtra).

Pycanum ochraceum Distant, 1893

Distribution: Bhutan, Myanmar, China (Guangxi, Guizhou, Xizang, Yunnan), India (Assam, Megharlaya, Nagaland Sikkim, West Bengal), Indo-China, Vietnam.

Pycanum oculatum Jensen-Haarup, 1931

Distribution: Java.

Pycanum ponderosum Stål, 1854

Distribution: Myanmar, India (Assam, Sikkim), Malay Penninsula, Sri Lanka, Vietnam.

Pycanum pretiosum Stål, 1854

Distribution: Moluccas, Malay Penninsula (Malaya), Philippines.

Pycanum vanvollenhoveni ✝︎ Piton, 1940

Distribution: France.

Comments: This genus can be divided in three groups, the ochraceum  group, the alternatum group and the extinct species group.
The first, characterized by the straight vesica of the male phallus, consists of occidentale, ochraceum and ponderosum. They are fairly easy to identify by external characters.
The second group, characterized by a bisinuate vesica of the male phallus, consisting of alternatum, oculatum and pretiosum, is much more tricky. Specimens of this group display a large variety of pronotum shapes, colour (particularly the paratergites which can be bicolor or unicolor), from brownish to resplendent green or deep purple, and size (from less than 20 mm to more than thirty), across its area of distribution. On the contrary, it is impossible to find the slightest variation in the male genitalia, which look all the same.
Regarding the third group it seems obvious from their original description that they are not belonging in this genus, and most probably not in Tessaratomidae at all. They look much more like ordinary Pentatomidae

Amyot C. J. B. & Serville M. J. G. 1843

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