Otostigmus (Parotostigmus) amazonae Chamberlin, 1914

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 : 437-439

Otostigmus (Parotostigmus) amazonae Chamberlin, 1914 syn. nov.

Figs 1–6

Redescription of syntype. Length: 32 mm from anterior margin of cephalic plate to posterior margin of tergite 21 ( Figs 1, 2 ). Antennae with 17 articles; first two basal articles glabrous. Cephalic plate smooth, without sutures and depression [two shallow longitudinal furrows in the caudal portion] ( Fig. 3 ). Coxosternal tooth-plates wider than long, with 4+4 teeth, the three inner closer to each other than the external ones, without a bristle ( Fig. 4 ). Coxosternite with a short paired sutures at base of tooth-plates [not described]. Trochanteroprefemoral process moderately large, with the margin with 2–3 short tubercles and tip pointed [not described]. Tergites smooth; tergites 5–20 with complete paramedian sutures [from 4–20]; tergites 3–4 with incomplete very short paramedian sutures in the anterior margin [not described]; tergites 12–21 with poorly developed lateral margination [only the 21st marginated]; tergite 21 with posterior margin gently convex [tergite 21 more or less angularly produced] and with a short median longitudinal depression ( Fig. 5 ). Sternites 3–19 [from 2–20] with “complete” paramedian sutures {paramedian sutures do not reach the anterior and posterior part of the sternites}; sternites 3–20 with rounded depressions [a short pit-like, median, depression in front of the caudal margin and a less pronounced median depression farther cephalad]; sternite 21 shorter than sternite 20, with the posterior margin straight [caudal margin mesally excised], converging posteriorly ( Fig. 6 ). Coxopleuron without spines; pore-field covers almost entire coxopleuron, only the posterior end poreless; terminal posterior margin of coxopleuron truncate. Legs 1 with two tarsal, one femoral and one tibial spur [legs 1–6 with two tarsal spurs]. Legs 5, 7, 18 and 19 [7–19] with one tarsal spur, legs 20 and 21 lacking spurs; Other legs were missed.

Remarks. Otostigmus amazonae syn. nov. has been recorded from several localities in northern Brazil, including the states of Amapá, Amazonas and Pará. There are also records from the mid-western region, especially from the state of Mato Grosso (Bücherl 1974). There are numerous records for Peru ( Bücherl 1943, 1950; Kraus 1954) and Colombia (Chagas-Jr. et al. 2014). The description of O. amazonae syn. nov. is very similar to O. muticus , especially regarding the paramedian sutures in the tergites and the paramedian sutures and rounded depressions in the sternites. The presence of two tarsal spurs, which may vary slightly, can be observed on legs 1–6. Bücherl (1974) noted that specimens of O. amazonae syn. nov. from Peru closely resembled specimens of O. muticus . Because most characters of both species are very similar, O. amazonae syn. nov. is considered a junior synonym of O. muticus .

Figures

FIGURES 1–2. Otostigmus (P.) amazonae Chamberlin, 1914 syn. nov. Syntype MCZ IZ no.1475 (14232). 1. Habitus, dorsal view. 2. Habitus, ventral view.Type material examined. Syntype MCZ IZ no.1475 (14232), Brazil,Amazonas, Manaus Expedition, Stanford Expedition to Brazil, col. W.M. Mann, 1911.

FIGURES 3–6. Otostigmus (P.) amazonae Chamberlin, 1914 syn. nov. Syntype MCZ IZ no.1475 (14232). 3. Cephalic plate and tergites 1 and 2, dorsal view. 4. Head, forcipular segment and sternite 1, ventral view. 5. Tergites 20 and 21, dorsal view. 6. Sternites of penultimate and ultimate leg-bearing segments, ventral view.