Sadyattes nigricornis ( Redtenbacher, 1908 )

Sadyattes nigricornis ( Redtenbacher, 1908) View in CoL

Pharnacia nigricornis Redtenbacher, 1908: 451 View in CoL . HT, ♂: Borneo [HNHM - destroyed]. Eucarcharus nigricornis, Günther, 1935b: 138 View in CoL .

Phobaeticus nigricornis, Brock, 1996: 29 View in CoL .

Otte & Brock, 2005: 269.

Baculolonga nigricornis, Bragg, 2001: 384 View in CoL .

Sadyattes nigricornis, Hennemann & Conle, 2008: 132 View in CoL .

Seow-Choen, 2017: 155.

Seow-Choen, 2019: 268.

Brock & Büscher, 2022: 559.

[Not: Caudell, 1927: 19 Misidentification that most certainly relates to S. borrii Stål, 1875 ]

Differentiation. A differential diagnosis of the ♂ of this species (the only sex described) is only possible upon literary sources, since the holotype is lost and no new material has yet become available. From annulatus , the only other Bornean member of the genus whose ♂ is known, this ♂ can be readily be separated by the much smaller size (body length 104.0 mm vs.> 131.0 mm in annulatus ), lack of a dark medio-longitudinal streak on the tegmina and costal region of the alae and white posteromedian marking of the abdominal sterna. The brief original description given by Redtenbacher (1908. 451) does not provide any additional characters that would serve for distinction.

Remarks. Unfortunately, the unique ♂ holotype of Redtenbacher’s species was destroyed by a fire during the Hungarian Revolution in 1956 at the museum in Budapest (HNHM). So far, no other ♂ could be traced that matches the brief original description and could serve for a neotype in order to provide stability for the taxon. The ♂ from Tjibodas, Mount Gede, W-Java by Caudell (1927: 19) and in the collection of the USNM could not be examined but most certainly is a specimen of the Javanese S. borrii Stål, 1875 . Below, a translation of Redtenbacher’s original description is provided. It is worth mentioning that at a length of 48.8 mm ( Redtenbacher, 1908: 451) this species has fairly long alae for the genus, which is shared with annulatus the only other known Bornean ♂ of the genus. As stated above, it is not unlikely that the unknown ♀ of nigricornis is represented by S. decoris ( Seow-Choen, 2016) , a moderately sized Bornean species that is here transferred from the genus Phobaeticus Brunner v. Wattenwyl, 1907 (comb. nov.). Body length of holotype ♂ 104.0 mm ( Redtenbacher, 1908: 451).

Description according to Redtenbacher (1908: 451): “ ♂. Antennae blackish-brown. Head unarmed, not gibbose posteriorly. Tegmina yellowish brown, anterior margin yellowish-white. Alae transparent brown, anterior margin white. (Front legs missing in specimen at hand). Four posterior femora yellowish, dorsally sparsely, ventrally densely armed with black spines on both outer carinae. Four posterior tibiae dorsally and ventrally on both outer carinae armed with small black spines, without enlarged teeth. Metatarsus not cristate. Anal segment truncated apically, with two very short, rounded lobes. Abdominal sterna brownish and with a white marking just before apex. Poculum rounded, convex.”

Distribution. “Borneo” [HNHM]