Otostigmus (Parotostigmus) lanceolatus, Chagas-Júnior, Amazonas, 2012

Chagas-Júnior, Amazonas, 2012, The centipede genus Otostigmus Porat in Brazil: Description of three new species from the Atlantic Forest; a summary and an identification key to the Brazilian species of this genus (Chilopoda, Scolopendromorpha, Scolopendridae, Otostigminae), Zootaxa 3280, pp. 1-28 : 5-8

Otostigmus (Parotostigmus) lanceolatus sp. n.

Figures 11–20

Type-specimens. Holotype (MNRJ 16018) and paratype (MNRJ 16017) from Reserva Particular do Patrimônio Natural da Serra Bonita, Camacan collected in 11–13.vi.2009; paratype (MNRJ 16016) 1 specimen from Mata do Lixão, Una collected in 08.vi.2009, all collected by A. Chagas, A. Kury, D. Pedroso, A. Giupponi & V. Dill, and Paratype (MNRJ 16015) 1 specimen from Trancoso, Porto Seguro collected by A. Chagas, B. Segal & E. Vasconcelos in 19.vi.2005. All these localities are in the state of Bahia.

Etymology. The specific epithet refers to the shape of the tarsus 2 of the ultimate pair of legs, which resembles a lanceolate leaf.

Diagnosis. Cephalic plate with few low tubercles, without sutures, but with two short longitudinal depressions at the posterior border. Tooth plates wider than long. Tergite 1 without sutures, but with low keels; tergite 2 without paramedian sutures, but with two low longitudinal keels; tergites 3 to 20 with clearly marked paramedian keels; tergite 2 to 20 marginate; tergites 3 to 8 with slight oblique keels; tergite 7 to 20 with low median longitudinal keel; tergite 21 with incomplete median longitudinal keel; central part of the posterior border slightly convex and with a low depression. Sternites 2 to 13 with anterior short incomplete paramedian sutures; sternites 2 to 17 with a slight rounded depression in the center and two low depressions on each side; sternites 9 to 15 with three small shallow rounded depressions arranged in a transversal line at the posterior border. Coxopleuron with relatively few pores and apical border with slight protuberance, and without spines. Ultimate pair of legs long and slender; tibia and tarsi flattened laterally; prefemur without spines. Tarsus 2 lanceolate; tibia and tarsi hirsute.

Description. Holotype (unsexed)

Length: 33 mm from the anterior cephalic plate to posterior border of tergite 21 and ultimate pair of legs 12 mm long.

Color: cephalic plate, forcipular coxosternum, tergites 1 to 3 and 19 and 20 and segment 21 purplish; tergites 4 to 18, sternites 1 to 19 and legs 1 to 20 light blue; ultimate pair of legs and antennae pale. Margin of coxosternal tooth-plates, tarsungula, trochanteroprefemur, spiracles, tibial and tarsal spurs, and distal parts of pretarsi orange.

Cephalic plate with few low small tubercles, without sutures or sulci, but with two shallow short longitudinal depressions at the posterior border ( Figure 11 ). These depressions are almost covered by the anterior border of tergite 1.

Antennae: reaching the anterior border of tergite 4; with 17 articles on the left and 14 in the right antenna; first two basal articles almost glabrous, with few long sparsely distributed hairs; from the third article densely hirsute, with short yellowish hairs.

The article 2 of telepodite of the second maxillae without spur.

Forcipular coxosternum smooth, without sulci or depressions; tooth-plates wider than long, with 4 teeth on each plate (Figure 12); two medial teeth partially fused and without bristles; process of forcipular trochanteroprefemur with one low inner tooth and terminated in an acute tip (Figure 12).

Tergites 1, 2 and 21 with few low small tubercles, tergites 3 to 20 distinctly wrinkled and with keels. Tergite 1 without sutures, but with low keels ( Figure 11 ); tergite 2 with two low longitudinal keels; tergites 3 to 20 with clearly marked paramedian keels ( Figure 13); tergite 2 to 21 marginate; tergites 3 to 8 with slightly oblique keel ( Figure 13); tergite 7 to 20 with low median longitudinal keel ( Figure 15); tergite 21 with incomplete median longitudinal keel (Figure 16); central part of the posterior border slightly convex and with a low depression.

Sternites smooth, longer than wide; sternites 1 to 8 with anterior and posterior margins with same width; sternites ( Figure 14),14 to 20 with anterior margin wider than the posterior; sternites 2 to 13 with short incomplete anterior paramedian sutures (not very evident); sternites 2 to 17 with a slight rounded depression in the center and two low depressions at each side of the former ( Figure 14); sternites 9 to 15 with three small shallow depressions arranged in a transversal line at the posterior border; sternite 21 longer than wide, converging posteriorly and with a shallow median longitudinal depression; central part of the posterior border slightly concave (Figure 18).

Coxopleuron with few pores; apical border with a slight protuberance and without spines ( Figures 17 and 18).

Ventral and lateral surfaces of femur and tibia and tarsi of legs 1 to 20 smooth; dorsal surface of the femur of legs 10 to 20 with few longitudinally arranged spinules. Legs 1 with femur and tibia with one spur and tarsus 1 with 2 with two spurs; legs 3 to 20 with one tarsal spur and 21 without. Pretarsus of legs 1 to 20 with anterior and posterior accessory spurs. Pretarsus of legs 21 without spurs.

Ultimate pair of legs long and slender. Prefemur and femur not flattened laterally, but tibia slightly and tarsi more strongly flattened laterally, especially tarsus 2; prefemur without spines (Figure 19). Tarsus 2 lanceolate; tibia and tarsi hirsute, tarsus 2 more hirsute than tibia and tarsus 1 ( Figure 20 ).

Type locality. Reserva Particular do Patrimônio Natural da Serra Bonita, Camacan, in the state of Bahia.

Distribution. Atlantic Forest of state of Bahia.

Remarks. O. lanceolatus resembles O. inermis Porat, 1876 , O. tidius Chamberlin, 1914 and O. sulcatus in the length of body, spurs in pretarsus and flattening of tibia and tarsi of the ultimate pair of legs. The body size is similar and varies from 38 mm to 50 mm. The tibia and tarsi of O. inermis and O. tidius are somewhat laterally flattened, but tarsus 2 is not lanceolate. In addition, O. lanceolatus is distinguished from O. sulcatus by the wrinkled dorsal integument, the presence of keels on tergites and lanceolate tarsus 2 and from O. sulcatus , O. inermis and O. tidius in the absence of anterior and posterior accessory spurs on the pretarsus of the ultimate pair of legs.

Figures

FIGURE 11. Otostigmus lanceolatus n. sp., holotype (MNRJ 16018). Cephalic plate and first two tergites. Scale bar 1 mm. FIGURE 12. Otostigmus lanceolatus n. sp., holotype (MNRJ 16018). Forcipular segment showing the tooth plates and the process of forcipular trochanteroprefemur. Ventral view. Scale bar 1 mm.

FIGURE 20. Otostigmus lanceolatus n. sp., holotype (MNRJ 16018). Detail of the tarsus 2 of the ultimate leg. Lateral view. Scale bar 1 mm.