Isagoras obscurum ( Guérin-Méneville, 1838 ), Conle & Hennemann & Bellanger & Lelong & Jourdan & Valero, 2020

Conle, Oskar V., Hennemann, Frank H., Bellanger, Yannick, Lelong, Philippe, Jourdan, Toni & Valero, Pablo, 2020, Studies on neotropical Phasmatodea XX: A new genus and 16 new species from French Guiana, Zootaxa 4814 (1), pp. 1-136 : 61

Isagoras obscurum ( Guérin-Méneville, 1838) rev. stat.

Phasma obscurum Guérin-Méneville, 1838: 72 , pl. 43. HT, ♀: Brésil, Bahia—not traced

Guérin-Méneville, 1838: pl. 235

Guérin-Méneville, 1838: 152, pl. 43

Haan, 1842: 124

Isagoras obscurus, Stål, 1875: 98

Zompro, 2004: 109, fig.

Metriotes obscura, Westwood, 1859: 160

Metriotes obscurus, Kirby : 1904: 415

[Note: Isagoras rugicollis Gray, 1835: 38 . Erroneous synonym of Redtenbacher (1906: 135); Phasma obscurum Guérin-Méneville, 1838 here reinstated as a valid species]

Further material: FRENCH GUIANA: 1 ♂: Museum Paris, Cayenne, Reicie 1840; 101. Isagoras obscurus guérin; 101 a) [ MNHN] .

Differentiation. From Isagoras similis n. sp. it differs by the distinctly longer cerci in both sexes.

Description. ♀. Relatively large for the genus. Length of body 98.0 mm. General colour of body chestnutbrown to dark-brown. Head and thorax bearing many small granules. Mesonotum 2.5x longer than pronotum. Antennae brown. Tegmina and costal area of alae dark brown to chestnut-brown with some scattered dark spots and a characteristic straw-coloured line on the tegmina near the sub-basal elevations (transverse when tegmina are closed). Sub-basal elevations on tegmina rounded and of convex shape. Anal area of alae translucent with fine brownish tessellation. Alae reaching to anal segment. Legs brown with some darker mottling. Profemora and protibia simple, not undulate.

♂. Length of body 53.97 mm. Similar to ♀, but more slender. Mesonotum 3.5x longer than pronotum and with beige mottling. Antennae brown with indistinct darker annulations.

Cerci straw-coloured, slender, half as long as anal segment, constricted towards posterior, projecting over posterior margin of anal segment. Anal segment straw-coloured, constricted towards posterior (in lateral aspect), the posterior margin at least half as broad as anterior margin; posterior margin flattened. Poculum of moderate size, bowl-shaped, having a distinct ventromedian keel; posterior margin constricted towards a pointed apex, slightly projecting over anterior margin of tergum IX. Posterior half of poculum straw-coloured. Epiproct deeply incised.

Comments. Redtenbacher (1906: 135) erroneously synonymised Phasma obscurum Guérin-Méneville, 1838 with Isagoras rugicollis ( Gray, 1835) . A detailed explanation is given above, in the comments for the genus.

Distribution. French Guiana: Cayenne [MNHN]. Brazil: Bahía.