Otostigmus (Parotostigmus) leior Chamberlin, 1955

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 : 446-447

Otostigmus (Parotostigmus) leior Chamberlin, 1955

Figs 26–30

Type material examined: Syntypes CAS 9187 (48-728), 14 specimens, Peru, 20 mi. S. Cuzco, 2.iii.1951, Ross and Michelbacher col.

Redescription of syntypes: Length: 55-60 mm from anterior margin of cephalic plate to posterior margin of tergite 21 ( Figs 26, 27 ). Antennae with 17 articles; first two basal and basal part of third glabrous. Cephalic plate smooth, without sutures and depressions, but with median sulcus [very short] in the anterior part [almost slightly concave] ( Fig. 28 ). The sides are rounded. Coxosternal tooth-plates wider than long, with 4+4 teeth and a long bristle [not described]; coxosternite with a transversal suture at base of tooth-plates, this suture is bifurcate in the sides and a very short median longitudinal suture. Trochanteroprefemoral process large, with the margin with short denticles and with the tip pointed [not described] ( Fig. 29 ). Tergites 6–19 with complete paramedian sutures [6–18]; sutures of tergite 20 not extending to posterior border but reaching to ¾ of tergite. Tergites 3–5 with very short incomplete paramedian sutures in the anterior and posterior margin [not described]; tergites 3–8 with very short incomplete oblique sutures in lateral sides; Tergites smooth; only tergite 21 margined [not described]; posterior margin of tergite 21 very slightly angulate [not described], with a shallow median longitudinal depression in posterior margin. Sternites 5–19 with incomplete paramedian sutures in the anterior border, reaching to middle of sternites [without sutures]; sutures from anterior and posterior sternites shorter than sternites of middle of the body; sternites 7–17 with two short incomplete sutures in posterior margin. Sternite 21 with posterior margin straight [caudal margin widely and but gently convex], shorter than precedent, converging posteriorly, trapezoidal; with a longitudinal depression (not described). Coxopleuron without spines. Pore-field covers almost entire coxopleuron, only the posterior end poreless. Posterior poreless part of coxopleuron with a shallow longitudinal depression as a sulcus. Posterior part of coxopleuron truncate [not described]. Leg 1 with one femoral and tibial spur; legs 1–2 with two tarsal spurs [1–4]; legs 3–19 with one tarsal spur, 20 and 21 without. Prefemur of ultimate pair of legs without spines and without sexual dimorphism. Prefemur and other parts of ultimate leg pair short [stouter], a little clavate distally.

Remarks. Chamberlin (1955) considered the specimens to be males, but this information could not be confirmed because this species does not appear to exhibit external dimorphism with some of the species reviewed here. He also mentioned that the specimens lack sutures on the sternites and have paired sutures on tergites 6–18. The specimens have incomplete paramedian sutures on the anterior margin of sternites 5 through 19 and complete paramedian sutures on tergites 6 through 19. The margin of the tergites and the distribution of the spurs of the walking legs in O. leior are the same as those seen in O. volcanus syn. nov. and fit the variation of O. muticus .

Figures

FIGURES 26–27. Otostigmus (P.) leior Chamberlin, 1955. Syntype CAS 9187 (48-728). 26. General view dorsally. 27. General view ventral.

FIGURES 28–30. 28. Otostigmus (P.) leior Chamberlin, 1955. Syntype CAS 9187 (48-728). Cephalic plate and tergite 1, dorsally. 29. Head, forcipular segment, and sternites 1 and 2, ventrally. 30. Tergites 20 and 21, dorsally.