Neduba oblongata Cole, Weissman, & Lightfoot

Cole, Jeffrey A., Weissman, David B., Lightfoot, David C., Ueshima, Norihiro, Warchałowska-Śliwa, Elżbieta, Maryańska-Nadachowska, Anna & Chatfield-Taylor, Will, 2021, A revision of the shield-back katydid genus Neduba (Orthoptera: Tettigoniidae: Tettigoniinae: Nedubini), Zootaxa 4910 (1), pp. 1-92: 28-30

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Neduba oblongata Cole, Weissman, & Lightfoot

sp. n.

Neduba oblongata Cole, Weissman, & Lightfoot   sp. n.

Fig. 9 View FIGURE 9 . (distribution), Fig. 11 View FIGURE 11 (male and female habitus, calling song, male and female terminalia, karyotype), Plate 4B View PLATE 4 (male calling song), Plate 6E View PLATE 6 (ventral sclerite), Plate 11B View PLATE 11 (female subgenital plate).

Common name. Mount Hamilton Shieldback. History of recognition. None.

Type material. HOLOTYPE MALE: USA, CA, Santa Clara Co., Mount Hamilton , 2.6 road mi. W observatory, 37.341883N, 121.643002W, 1036 m, 12-VI-1982, DB Weissman, S 82-23 [stop], R82-47 [recording], T82-2 [karyotype], 127 [teeth] 3.5 [mm stridulatory file length], deposited at CAS, Entomology type #19713. GoogleMaps  

PARATYPES (n=10): USA, CA, Santa Clara Co., 1♁, Mount Hamilton , 0.3 mi. W observatory, 37.341883N, 121.643002W, 1260 m, 6-VII-1997, DB Weissman GoogleMaps   , CAS; 3♁, Mount Hamilton , 15 mi. W observatory, 37.341883N, 121.643002W, 488 m, 12-VI-1982, DB Weissman GoogleMaps   , CAS; 3♁, 1♀, Mount Hamilton , 2.6 mi. W observatory, 37.341883N, 121.643002W, 1036 m, 12-VI-1982, DB Weissman GoogleMaps   , CAS; 2♁, Mount Hamilton , 6.5 mi. W observatory, 37.32864N, 121.65729W, 686 m, 8-VIII-2015, DB & DW Weissman GoogleMaps   , LACM

Measurements. (mm, ♁n = 8, ♀ n = 1) Hind femur ♁18.44–20.61, ♀ 22.01, pronotum total length ♁8.65–11.01, ♀ 9.66, prozona length ♁3.65–5.21, ♀ 4.95, metazona dorsal length ♁4.80–6.27, ♀ 4.71, pronotum constriction width ♁2.50–3.14, ♀ 3.55, metazona dorsal width ♁6.00–7.39, ♀ 6.43, head width ♁4.26–4.85, ♀ 5.18, ovipositor length ♀ 18.58.

Distribution. Known only from Mount Hamilton in the Diablo Range, Santa Clara County, California.

Habitat. Oak woodland and chaparral.

Seasonal occurrence. Available records indicate adult activity extends throughout the summer from mid-June (12-VI-1982, DB Weissman, CAS) through mid-August (8-VIII-2015, DB & DW Weissman, CAS).

Stridulatory file. (n = 4) length 2.8–3.5 mm, 114–134 teeth, tooth density 39.1 ± 2.3 (36.3–41.3) teeth/mm.

Song. (n = 9) Unique. PTR is bimodal and switches between a slow rate 7.45 ± 0.59 s- 1 and a fast rate of 11.2 ± 1.28 s- 1.

Karyotype. (n = 4) 2n♁ = 26 (2m + 22t + XtYt), S82-23, T82-2, paratopotype.

Recognition. Stridulatory file, male genitalia, song, and geography. A low stridulatory file tooth density separates this species (36–41 teeth/mm) from N. carinata   , which has a significantly higher density (38–55 teeth/mm; two-sample t -test, P = 0.007). The ventral sclerite is robust with a straight shaft, low convex apex, and a minute lateral process. Other Carinata Group species have a longer lateral process, and the shaft of Convexa Clade species is curved. Santa Lucia Mountains N. carinata   males may have a minute lateral process but the whole sclerite is not as robust as in N. oblongata   . The ventral sclerite of N. diabolica   , which inhabits the same mountain range, has a more conical apex, a longer lateral process, and a curved shaft. The calling song is unique among Carinata Group species in having a bimodal PTR. The female subgenital plate is pentagonal and flat, identical to N. carinata   , both of which are separated from N. diabolica   by the lack of a medial groove. This species is geographically restricted to the Mount Hamilton vicinity in the Diablo Range of California.

Etymology. l. oblongata   oblong, referring to the fusiform habitus and enlarged, oval pronotum.

Notes. The two highest peaks in the Diablo Range, Mount Hamilton (1284 m) and Mount Diablo (1173 m) are mountain habitat islands separated by a mere 67 km, yet each harbors a distinct Carinata Group species (see N. diabolica   below). This contrasts with a single (albeit variable) species, N. carinata   , distributed across 200 km of the South Coast Ranges. The Santa Clara Valley is thus implicated as an isolating barrier between the Diablo Range and the Coast Ranges, while the Vallecitos Valley is a potential biogeographic break between populations in the north and south of the Diablo Range. The bimodal PTR in the male calling song is reminiscent of the songs of Sierranus Group species (see below). Given the evolutionary distance between the Carinata Group and the Sierranus Group ( Figs. 3–5 View FIGURE 3 View FIGURE 4 View FIGURE 5 ), the mostly likely explanation for shared bimodal PTR is convergent evolution. A preexisting receiver response may exist in Neduba   females (e.g. Basolo 1996; Ryan & Rand 1999) that selects for male songs with an elaborate pattern or additional OPT.

Material examined. Type series only. See Type material above.


Chicago Academy of Sciences


California Academy of Sciences


Natural History Museum of Los Angeles County