The grasshoppers and crickets (Orthoptera) of the Socotra Archipelago (Yemen): a comprehensive overview and a description of a new Oecanthus Tree Cricket (Oecanthidae) Author Felix, Rob 0000-0003-1564-3781 Nijmegen, Netherlands Author Bouwman, Jaap Arnhem, Netherlands Author Odé, Baudewijn 0000-0002-8929-2737 Plasmolen, Netherlands Author Ketelaar, Robert Warnsveld, Netherlands Author Pham, Duc Minh Giessen, Germany Author Bailey, James Laguna Niguel, USA text Contributions to Entomology 2025 2025-03-14 75 1 21 166 journal article 308643 10.3897/contrib.entomol.75.e144389 5ebde770-f8f9-42c1-8d80-3069053e0777 57F30CBD-C51F-4D9A-A280-8EF2CE6D2E8E Oecanthus chopardi Uvarov, 1957 Figs 165 , 167 , 168 , 173 , 174 , 175 , 176 , 177 References for Socotra . Burr 1903: 412 , 423 [as Oecanthus pellucens ]; Krauss 1907: 17 , 27, 30 [ partim ; as O. indicus ]; Uvarov (in Uvarov and Popov (1957) ): 364–365 [ partim ]; Walker 1966: 270; Gorochov 1993: 92 [ partim ?]; Wranik 2003: 316 , plates 146, 149 [ partim ]; Chintauan-Marquier et al. 2016: 60 , 70 [is Oecanthus castaneus Felix & Bouwman , sp. nov. ]; De Campos et al. 2022: 6 [is Oecanthus castaneus Felix & Bouwman , sp. nov. ]. Diagnostic notes. See Oecanthus castaneus Felix & Bouwman , sp. nov. Taxonomic notes. O. chopardi was described by Uvarov (in Uvarov and Popov (1957) ), based on four specimens from Wadi Dineghen, including the holotype (Fig. 174 ) and one paratype from Maabad. About that last paratype , Uvarov (in Uvarov and Popov (1957) ) mentioned the following: “ There is some variation in the brown elytral pattern of the male; the male from Moabbadh plain [Maabad] is marked very heavily its head, pronotum and antennae being blackish-brown ”. In the collection of the NHMUK , this is written on a note by Bruce Townsend: “ wing pattern of the fifth syntype [= fourth paratype ; Maabad] differs markedly from that of the other four and it is clearly a different species ”. Oecanthus chopardi Uvarov, 1957 , male in light trap. Ayhaft, Socotra, 22 Feb 2009 (photograph Rob Felix). Oecanthus chopardi Uvarov, 1957 , male, holotype. Scale bar: 1 cm (photograph Rob Felix). The paratype from Maabad is assigned here as a paratype of Oecanthus castaneus Felix & Bouwman , sp. nov. Krauss (1907) also mentioned two different colour types within the specimens collected by Simony. After examination of these specimens, two belong to O. chopardi and two to O. castaneus sp. nov. All specimens collected by Guichard in 1967, mentioned by Gorochov (1993) as O. chopardi , belong to O. castaneus sp. nov. Gorochov (1993) further mentioned three specimens ( 2 ♂ , 1 ♀ ) collected by Kurzenko in 1984, the specific status of which is unknown to us. Wranik (2003) depicted O. castaneus sp. nov. instead of O. chopardi (plates 146, 149). All Oecanthus material from Socotra in Massa’s collection belongs to O. castaneus sp. nov. , except for two female specimens from Samha Is. These females are yellowish-white and might belong to O. chopardi or a third species. Further study must reveal the specific status of the taxon present on that island. Distribution and occurrence. O. chopardi is endemic to Socotra and is found at several sites in the Hagher and Maaleh Mountains (Fig. 175 ). Records are few and O. chopardi may well be a scarce species. Distribution of Oecanthus chopardi Uvarov, 1957 in the Socotra Archipelago. The labels of the type specimens mention Deneghan, 300 ft (ca. 91 m ), while Uvarov (in Uvarov and Popov (1957) ) mentions 3000 ft (ca. 914 m ) instead, which is on Adho Dimello. Later, Popov (1984) mentioned 300 ft (ca. 91 m ). We consider the latter as correct (see Discussion). Possible calling song of Oecanthus chopardi Uvarov, 1957 . Spectrogram depicting 2 s with a carrier frequency around 3 kHz. Accompanying species shown are Ectatoderus sp. 2 (carrier frequency around 4 kHz) and Modicogryllus perplexus Cade & Otte, 1984 (carrier frequency around 5 kHz), with faint traces of Ruspolia aff. R. basiguttata (Bolívar, 1906) (carrier frequency around 13 kHz); RecRF 10151. Habitat and biology. The species is restricted to well-wooded habitats in the zones with Frankincense woodland and forest, montane forest and mosaic. They were collected in a light trap. Records are from 90–914 m a. s. l. and February and March only. Oecanthus chopardi Uvarov, 1957 , female. Maaleh, Socotra, 9 Feb 2024 (photograph James Bailey). Bioacoustics. The calling song of Oecanthus chopardi has not been described so far. We also have not been able to record and subsequently collect a specimen of this species. However, in one sound recording from Adho Dimello high in the Hagher, we heard an alleged Oecanthus species , clearly different from Oecanthus castaneus Felix & Bouwman , sp. nov. We assume it could be possible that the song in the recording is from this species. The song recorded consists of echemes lasting 800–850 ms and is repeated not very frequently. Echemes consist of about 35 syllables, repeated at about 40 per second. The carrier frequency is 3.2 kHz. Remarks. Chintauan-Marquier et al. (2016) genetically analysed an O. castaneus sp. nov. specimen from Ayhaft. However, they published it as Oecanthus chopardi , the only species known to the island at the time of publication (see O. castaneus sp. nov. ).