Otostigmus (Parotostigmus) muticus Karsch, 1888

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 : 451-452

Otostigmus (Parotostigmus) muticus Karsch, 1888

Type material examined: Syntypes ZMB 435 (3169), 3 specimens, Peru .

Additional material examined: ZMH (Mus. Paris), 2 specimens, Amancaes , Lima Peru, 15-vii-1903; ZMB, 2 specimens, Peru, 1.xii.1913, F. Beunaer .

Redescription of syntypes. Length: 50 mm from anterior margin of cephalic plate to posterior margin of tergite 21. Antennae with 17 articles; first two basal glabrous. Cephalic plate smooth, without sutures and depression. Coxosternal tooth-plates wider than long, with 4+4 teeth, and with a long bristle; coxosternite with a short paired sutures at base of tooth-plates. Trochanteroprefemoral process large, with the margin with two short tubercles and with the tip pointed. Tergites smooth; tergites 4(5)–20 with complete paramedian sutures; tergites 9–21 margined. Sternites 6–18(19) with paramedian sutures [almost complete, from the anterior to ¾ of the sternite]; sternites with shallow median longitudinal depression in the center. Sternite 21 without sutures, but with a shallow rounded depression, and with posterior margin slightly concave. Coxopleuron without spines. Pore-field covers almost entire coxopleuron, only the posterior end poreless. Posterior part of coxopleuron truncate. Posterior part of coxopleuron without protuberance. Leg 1 with a prefemoral and femoral spur; legs 1(2)–6 with two tarsal spurs; legs 7–19 with one tarsal spur, and 20 and 21 without. In one specimen, leg 20 has one tarsal spur, but in other leg 20 without. Prefemur of ultimate legs without spines; ultimate legs long and slender.

Remarks. The syntypes are labeled as “ Scolopendra Otostigmus mutica ”. The two additional specimens examined at the ZMB were labeled as O. amazonae syn. nov. Otostigmus muticus is one of the most widespread species in the Andes and other regions of South America and exhibits considerable morphological variation. Nevertheless, features of the tergites, sternites, and walking legs are common to O. amazonae syn. nov., O. calcanus syn. nov., O. volcanus syn. nov., and O. leior , with slight variations in some of them (see Table 2 ).