Alluropus calcaratus (Pocock, 1891)

Figs 1, 2, 3

Rhysida calcarata Pocock, 1891: 61; Kraepelin 1903: 146; Attems 1930: 191; Attems 1938: 338; Schileyko 2007: 83, fig. 6; Siriwut et al. 2018: 1029, figs 14–23.

Alluropus demangei Silvestri, 1912; Attems 1930: 198; Schileyko 2007: 92; Tran et al. 2013: 221;

Rhysida marginata Schileyko, 2007: 92; 148; Tran et al. 2013: 227;

Alluropus calcaratus Siriwut et al. 2018: 1029; Schileyko et al. 2020: 50.

Examined materials.

Vietnam • 3 specimens; Ba Ria – Vung Tau Province, residential area; 10.62583°N, 107.44694°E; 47 m a. s. l.; 25 Oct. 2016; A. D. Nguyen leg.; IEBR.VT.2016.1, IEBR.VT.2016.2, IEBR.VT.2016.3 . • 1 specimen; Dong Thap Province, Tram Chim NP, Melaleuca forests; 10.71746°N, 105.52186°E; 47 m a. s. l.; 25 Oct. 2016; D. H. Dang leg.; SVR.TrC.010 .

Diagnosis.

Body with 21 LBS, and LBS 7 th with spiracles (Fig. 2 E). Antennae (Fig. 2 A, B) composed of 20–21 articles, of which three basal ones glabrous dorsally. Cephalic plate smooth, lateral and posterior marginations absent; the posterior edge straight, and covered by tergite 1 (Fig. 2 A). Forcipular trochanteroprefermur with median tooth; tooth-plates with 4 + 4 teeth clearly, sharply (Fig. 2 B). Tergite 1 wider than the cephalic plate and twice as long as tergite 2 (Fig. 2 A); tergites 3–19 (20) with complete paramedian sutures, and tergites 12 (13) – 20 with lateral marginations incomplete or nearly complete (Figs 2 E, 3 A, B). Sternites 3–20 with complete paramedian sutures (Fig. 2 C, D). Coxopleuron with 1 apical, 2 subapical, and 1 lateral spine, without dorsal spine (Fig. 3 D). Leg 1 with prefemoral and femoral spurs (Fig. 2 B). Ultimate legs (Fig. 3 C, D) long and slender, with ratio between the length and width of prefermur 4.5: 1; prefemoral spines on ultimate leg: 4 VL, 2–3 VM, 3–4 M, and 1–2 DM spines.

Remarks.

Compared to Kraepelin (1903), Attems (1930), and Siriwut et al. (2018), our specimens have slight differences, e. g., shorter body length (maximum 32 mm vs. 57 mm in Kraepelin (1903) and 52 mm in Siriwut et al. (2018)). This is probably due to the low number of specimens collected and probably not an actual difference. The lateral marginations start from tergite 9 (or 11) in descriptions of Attems (1930) and Kraepelin (1903), but these start from tergite 12 (or 13) in our specimens and the description of Siriwut et al. (2018).

Our specimens do not agree with the description of Siriwut et al. (2018) in the ratio between tarsus 1 and tarsus 2 (1.6: 1 vs. 0.3: 1) but more or less similar to Schileyko (2007) (terminal tarsus 1 more than twice longer than tarsus 2).

Distribution.

This species has only been recorded in Southeast Asia, including Thailand, Laos, Cambodia, and Vietnam (Tran et al. 2013; Siriwut et al. 2018). In Vietnam it was recorded from Ha Nam Province (Phu Ly) and Ca Mau Province (Attems 1930; Tran et al. 2013), and Ba Ria – Vung Tau Province and Dong Thap Province in this study. The distribution of A. calcaratus was further updated (Fig. 1).