Otostigmus (Parotostigmus) calcanus Chamberlin, 1944

Chagas-Jr, Amazonas & Souza, Emerson Marques, 2024, A review of the types of some Otostigmus (Parotostigmus) (Scolopendromorpha, Scolopendridae, Otostigminae) of the Andes mountain range, Zootaxa 5529 (3), pp. 436-460 : 441-442

Otostigmus (Parotostigmus) calcanus Chamberlin, 1944 syn. nov.

Figs 14–19

Type material examined: Paratypes (2 specimens) FMNH-INS 0000008 435, Peru, Haciens Urco, nr Calca , Cuzco, 19.ix.1939, col. by K.P. Schmidt, under stones near water , Museum Magellanic Expedition, Rec’d. 12.xii.1939.

Redescription of paratypes. Length: 30 mm from anterior margin of cephalic plate to posterior margin of tergite 21 ( Figs 14, 15 ). In one type the right antenna with 17 articles and left with 13 (some articles are missing); other type with right antenna with 9 articles (some articles are missing) and left antenna with 19 [17 articles in the right antenna and 16 articles in the left, normally 17]; first two basal and basal part of the third glabrous.

Cephalic plate smooth, without sutures and depressions, but with anterior margin slightly concave between the antennae with very short sulcus [not described] ( Fig. 16 ). Coxosternal tooth-plates wider than long, with 4+4 teeth and a long bristle; coxosternite with a short paired sutures at base of tooth-plates, this suture is bifurcate in the sides and a short median longitudinal suture [not described] ( Fig. 17 ). Trochanteroprefemoral process moderately large, with the margin with one short tubercle and with tip pointed.

Tergites smooth; tergites 6–20 with complete paramedian sutures [from 5]; tergites 3–5 with very short incomplete paramedian sutures [not described]; only tergite 21 margined in one specimen, but in the other specimen tergites 15–21 with poorly-developed margins; posterior margin of tergite 21 very slightly angulate in one specimen ( Fig. 18 ), but in the other slightly convex. Sternites 3–19 with incomplete paramedian sutures; the incomplete paramedian sutures from anterior and posterior part of trunk shorter than the sutures at middle of body that reach ¾ of the sternite. Sternite 21 with posterior border straight, shorter than precedent, trapezoidal, without depression ( Fig. 19 ). Coxopleuron without spines, but with the posterior part with a very short protuberance; pore-field covers almost entire coxopleuron, only the posterior end poreless. Left leg 1 with one femoral spur and one tibial spur; legs 1–2 with two tarsal spurs; legs 3–19 with one, and legs 20 and 21 without. No sexual appendix.

Remarks. The paratypes of O. calcanus syn. nov. are severely damaged, with almost all legs and antennae missing. The legs are stored separately in a small vial within a vial containing the paratypes. In one paratype, tergites 15 to 21 are marginated, resembling O. muticus and O. amazonae syn. nov. In the other paratype, only tergite 21 is marginated, as observed in O. leior and O. volcanus syn. nov. The paramedian sutures, sutures on the sternites, and tarsal spurs on the legs of O. calcanus syn. nov. correspond to the variation found in specimens identified as O. muticus . Therefore, the paratype of O. calcanus syn. nov. with tergites marginated from 15–21 is considered a junior synonym of O. muticus and the paratype of O. calcanus syn. nov. with only tergite 21 marginated is considered a junior synonym of O. leior .

Figures

FIGURES 14–15. Otostigmus (P.) calcanus Chamberlin, 1944 syn. nov. Paratype FMNH-INS 0000008 435. 14. General view dorsally. 15. General view ventral.

FIGURES 16–19. Otostigmus (P.) calcanus Chamberlin, 1944 syn. nov. Paratype FMNH-INS 0000008 435. 16. Cephalic plate and tergites 1 and 2, dorsally. 17. Head, forcipular segment, and sternites 1 and 2, ventrally. 18. Tergites 20 and 21, dorsally. 19. Sternites 20 and 21, ventrally.