Aphilodon angustatus Silvestri, 1909

Calvanese, Victor C., Brescovit, Antonio D. & Bonato, Lucio, 2019, Revision of the Neotropical species of Aphilodontinae (Geophilomorpha, Geophilidae), with eight new species and a first phylogenetic analysis of the subfamily, Zootaxa 4698 (1), pp. 1-72 : 26-27

Aphilodon angustatus Silvestri, 1909

( Fig. 18 )

Aphilodon angustatus Silvestri 1909a: 269 (in key; original description); Silvestri 1909b: 56 (description), plate XI, figs 1–3; Chamberlin 1914: 209, 153; Attems 1929: 315 (in key), 316 (description); Bücherl 1940: 313 (description); Bücherl 1942b: 213 (new record), 216, 217; Bücherl 1942a: 365, 368, 369, 371; Pereira 1998: 473; Foddai et al. 2000: 105; Pereira et al. 2007: 41 (description, new record), 47 (in table), figs 41-62; Undheim et al. 2011: 515; Dugon & Arthur 2012: 129; Bonato et al. 2014: 487 (morphology), fig. 9a; Undheim et al. 2015: 681; Battirola et al. 2017: 5, 6 (new record), 8, 9, 10.

Type specimens. Syntypes: 1♀, 1♂, from “ Corrientes, S. Pedro ( Missiones [sic], Argentina)” ( Silvestri, 1909b), F. Silvestri col., 1909; deposited in MCSG “ Vase type XVIII”; specimens labeled “a–b” .

Type locality. Argentina: Misiones : San Pedro: Corrientes .

Material examined. ARGENTINA. Misiones: Corrientes, San Pedro , 1909, F. Silvestri col., 1♀, 1♂ [syn- types] (MCSG). BRAZIL. Mato Grosso: Poconé, Pirizal (16°16’S, 56°22’W), 29/02/2004, J.L. Silva col., 1♀ ( PD G 981 ) . São Paulo: Bananal (22°41’01” S, 44°19’24”W), 2010, J.M. Pereira col., 3♀, 1♂ ( IBSP 3655 ) ; Caucaia do Alto, Reserva Morro Alto (23°41’S, 47°1’W), 07/2016, V.C. Calvanese col., 2♀, 1♂ ( IBSP 4065 ) ; Iporanga, Parque Estadual do Alto do Ribeira (PETAR) (24°35’08”S, 48°35’35”W), 2010, J.M. Pereira col., 3♀, 2♂ ( IBSP 3657 ) ; Paraná, Sangés (24°06’46”S, 49°27’49” W), 5♀ ( IBSP 878 ) .

Diagnosis. A species of Aphilodon with: around 53–59 leg-bearing segments; known body length in adults 11–19 mm; cephalic plate length/width ratio 1.1–1.2; antenna ca. 2 times as long as cephalic plate; pectinate lamella of mandible with straight denticles; coxosternite of second maxillae not distinctly shorter in middle part; forcipular pretergite exposed; telopodite of second maxillae with article 3 shorter than article 2 and with 2 subapical setae and a short sensillum between; forcipule with lateral margin posteriorly straight; tarsungulum ca. 0.8–0.9 times as long as trochanteroprefemur+femur; forcipule with 3+1 denticles; distal denticle of trochanteroprefemur, denticle of femur and denticle of tibia relatively large and denticle of tarsungulum relatively small; distal denticle of trochanteroprefemur and denticle of femur separate; all pleurites conspicuous; each coxopleuron with 6–8 coxal pores in adults; ultimate presternite entire or apparently divided in middle part; metasternite of ultimate leg-bearing segment length/width ratio ca. 0.7; ultimate legs ca. 1.7–1.8 times as long as penultimate legs, with tarsus 1 1.1–1.2 times as long as tibia.

A. angustatus differs from all other species of Aphilodon by having: around 53–59 leg-bearing segments; body length less than 25 mm; distal denticle of trochanteroprefemur, denticle of femur and denticle of tibia relatively large and denticle of tarsungulum being relatively small ( Fig. 18C ); less than 10 coxal pores on each coxopleuron in adults.

Recorded specimens:> 25, including 17 ♀ and 5 ♂, from 10 localities.

Distribution. Argentina—Misiones: Corrientes, San Pedro ( Silvestri 1909b). Brazil—Mato Grosso: Corumbá, Urucum ( Silvestri 1909b); Poconé, Pirizal ( Pereira et al. 2007); Nossa Senhora do Livramento ( Battirola et al. 2017). Brazil—São Paulo: Bananal (new record); Cotia, Caucaia do Alto (new record); Iporanga, Parque Estadual do Alto do Ribeira (new record); “zona araraquarense” ( Bücherl 1942a). Brazil—Paraná: Sangés (new record). Paraguay—Paraguarì ( Silvestri 1909b).

Known variation. Sternite of the ultimate leg-bearing segment: shorter in middle in all specimens from Parque Estadual do Alto do Ribeira (PETAR) (N= 3♀, 2♂).

Figures

FIGURE 18. A–D, Aphilodon angustatus Silvestri, 1909. Male (IBSP 3655): A, left telopodite of second maxillae, ventral; B, article 3 of second maxillae telopodite, ventro-lateral; C, forcipular segment, ventral; D, terminal part of body, ventral. Scale bars: 0.01 (A–B), 0.3 (C–D) mm.