Otostigmus (Parotostigmus) lavanus Chamberlin, 1957

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 : 444-446

Otostigmus (Parotostigmus) lavanus Chamberlin, 1957 syn. nov.

Figs 20–25

Type material examined: Holotype male CAS 15215 (12-169), Ecuador, 6-12 mi. SW. Baños, N. slope Mt. Tungurahua, 13.ii.1955, E.I Schlinger & E.S. Ross.

Redescription of holotype. Length: 52 mm from anterior margin of cephalic plate to posterior margin of tergite 21 ( Figs 20, 21 ). Antennae damaged; antennae with 11 articles (left) and 12 (right); first two basal and basal part of third glabrous [17 articles]. Cephalic plate smooth, without sutures and depressions [not described] ( Fig. 22 ). Coxosternal tooth-plates wider than long, with 4+4 teeth and a long bristle ( Fig. 23 ); coxosternite with a short paired sutures at base of tooth-plates, this suture is bifurcate in the sides and a short median longitudinal suture [without sutures]. Trochanteroprefemoral process large, with the margin with three short tubercles and with tip pointed [not described]. Tergites 6–20 with complete paramedian sutures; tergites 9–21 with a very shallow median longitudinal keel [last tergites]; tergites 1–4 smooth; tergites 5–21 rugose on lateral sides, the rugosity increasing from the anterior to posterior tergites; tergites 9–21 margined [only tergite 21]. Posterior margin of tergite 21 very slightly angulate, with a shallow median longitudinal depression in the posterior border ( Fig. 24 ); tergite 21 with a shallow short median longitudinal keel. Sternites 4–19 a small rounded depression in the center. Sternite 21 with posterior margin concave [triangular], shorter than precedent, converging posteriorly, with a shallow median longitudinal depression [without median sulcus]. Coxopleuron without spines. Pore-field covers almost entire coxopleuron, only the posterior end poreless. Posterior part of coxopleuron with a very short, angulate protuberance. Leg 1 without femoral and tibial spur; left leg 1 with two tarsal spurs and right leg with one; legs 1(2)–19 with one tarsal spur, 20 and 21 without. Coxae 19 with a short protuberance as a very short appendix [coxa with a mesocaudal corner] ( Fig. 25 ); coxae 20 with a larger appendix curved posteriorly [coxae of the twentieth legs with a conspicuous process, curved distally and extending a little beyond the last sternite]. This appendix exceeds sternite 21 ( Fig. 25 ). Prefemur of ultimate legs without spines, with a digitiform appendix almost the same length as the prefemur; the digitiform appendix is dorsoventrally flattened and with a tuft of hair at its tip. This tuft of hair is localized dorsally.

Remarks. Otostigmus lavanus syn. nov. presents a series of characters of tergites, legs and external sexual characters like O. insignis and O. silvestrii intermedius . The most peculiar character shared with them is the shape and length of the appendix on the coxae of leg 20 in males. Furthermore, O. lavanus syn. nov. and O. insignis share the marginal tergites 6 to 21 and legs 1 to 19 with a tarsal spur. Therefore, O. lavanus syn. nov. is considered a junior synonym of O. insignis .

Figures

FIGURES 20–21. Otostigmus (P.) lavanus Chamberlin, 1957 syn. nov. Holotype CAS 15215 (12-169), male. 20. General view dorsally. 21. General view ventral.

FIGURES 22–25. Otostigmus (P.) lavanus Chamberlin, 1957 syn. nov. Holotype CAS 15215 (12-169), male. 22. Cephalic plate and tergite 1, dorsally. 23. Head, forcipular segment, and sternites 1 and 2, ventrally. 24. Tergites 20 and 21, dorsally. 25. Sternites 20 and 21, ventrally.