Aphilodon indespectus, Calvanese & Brescovit & Bonato, 2019

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 : 30-31

Aphilodon indespectus new species

( Figs 4 D–H, 5A, 21, 22, 39E, 42D)

Type specimens. Holotype: ♀, from Parque Ecológico da Mata da Câmara , São Roque, São Paulo, Brazil 06/2014, V. Calvanese col., deposited in IBSP 3653 . Paratypes: 3♀, 4♂, same data as holotype, deposited in IBSP 3653 .

Type locality. Brazil: São Paulo: São Roque: Parque Ecológico da Mata da Câmara : 23°31’41”S, 47°6’51”W .

Material examined. BRAZIL. São Paulo: Bananal (22°41’01”S, 44°19’24”W), 2010, J. M. Pereira col., 3♀, 3♂ ( IBSP 3654 ) ; São Roque, Parque Ecológico da Mata da Câmara (23°31’41”S, 47°6’51”W), 06/2014, V. Calvanese col., 1♀ [holotype] ( IBSP 3653 ) , 3♀ and 4♂ [paratypes] ( IBSP 3653 ) .

Etymology: The epithet is an adjective and means “invisible”, referring to the difficulty in finding specimens of the species in the field.

Diagnosis. A species of Aphilodon with: around 39–41 leg-bearing segments; known body length in adults 10–19 mm; cephalic plate length/width ratio ca. 1.1; 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; telopodite of second maxillae with article 3 shorter than article 2, with 1 or 2 setae in apical or subapical position and a subapical sensillum; forcipular pretergite exposed; forcipule with lateral margin posteriorly straight; only vestigial forcipular denticles; tarsungulum ca. 0.7 times as long as trochanteroprefemur+femur; all pleurites relatively small and well-separated by membranous regions; each coxopleuron with ca. 10–15 coxal pores in adults, all sparse; ultimate presternite exposed and apparently divided in middle part; metasternite of ultimate leg-bearing segment length/width ratio ca. 0.5–0.6; ultimate legs 1.8 times as long as penultimate legs; tarsus 1 of ultimate legs ca. 2.0 times as long as tibia.

A. indespectus n. sp. differs from all other species of Aphilodon by having only vestigial forcipular denticles ( Figs 21A , 22C ), and all pleurites relatively small and well-separated by membranous regions ( Fig. 21B ).

Recorded specimens: 14, including 7♀ and 7♂, from two localities.

Distribution. Brazil—São Paulo: Bananal; São Roque.

Description of holotype. Female (IBSP 3653).

Entire body: length 17, maximum width 0.5. Cephalic plate: more or less oval, length 0.49 and width 0.45 (length/width ratio 1.08), with relative long and sparse SE. Antenna: length 0.9, 2.0 times as long as cephalic plate; AA II–XIII length/width ratio 0.58–0.91; LAA 2.0 times as long as AA XIII.

Clypeus: 4+4 LS, 1+1 PS, 9+9 SCS. Mandible: PL with 14 denticles. First maxillae: left TFM length 0.05 and width 0.04; DA with 2 lateral apical SE; MPC with 2 sub-lateral SE and 1 or 2 little sub-apical SL. Second maxillae: 8 little SE distributed in a row along posterior margin of CSM, between TSM; left TSM length 0.08 (1.86 times as long as TFM) and maximum width (basal margin) 0.04; both TSM with 2 subapical SE and one little SL in apical region.

Forcipular segment: FTE sub-trapezoidal to rectangular, length 0.32 (0.65 times as long as cephalic plate) and maximum width 0.85, with scattered SE; FPT length 0.06 and width 0.69; FCX length 0.28 and width 0.32 (length/ width ratio 0.87); FRL length 0.24, not reaching anterior margin of cephalic plate, with 4 vestigial denticles and with 1 SE in position corresponding to FD1, 5 SE in position corresponding to FD2 and 3 SE in position corresponding to FD3; TA 0.75 times as long as TFF; DT very short, detected only with SEM.

Walking legs: 41 pairs; FL 0.70 times as long as second leg, with procoxae extended to body midline; leg 25 length 0.75. Tergum from the first to penultimate leg-bearing segment: TE rectangular, with slightly rounded edges; TE 25 length 0.28 and width 0.56 (length/width ratio 0.5), with relatively large and scattered SE; PT also elongated, 0.6 times as long as TE, with relatively large and scattered SE. Sternum from the first to penultimate leg-bearing segment: STF oval; other ST elongated; ST 25 length 0.32 and width 0.26 (length/width ratio 1.23); PST visible in most anterior segments, apparently divided up to segment 7, entirely and broadly exposed in middle and terminal part of body.

Ultimate leg-bearing segment: MTL longer than wide, trapezoidal, length 0.11 and width 0.21 (length/width ratio 0.52); UPS entire. Ultimate legs: thin, length 1.1, ca. 1.8 times as long as penultimate leg; each CXP with 12–13 COP, scattered, smallest pore the closest to MTL; tarsus I ca. 2.0 times as long as tibia. Postpedal segments: GF with 2+2 distal SE.

Known variation. Male: ultimate legs thicker and hairy, with tarsus I ca. 1.6 times as long as tibia; GM biarticulated; GM1 with 5–6 SE arranged in 2 rows; GM2 with 6–8 distal SE.

Figures

FIGURE 4. A–H, Aphilodontinae antenna. Aphilodon pereirai n. sp. (IBSP 3784): A, left antenna, ventral. Mairata butantan n. sp. (IBSP 3663): B, left antenna, ventral. Aphilodon silvestrii n. sp. (IBSP 3665): C, last antennal article of the left antenna,,ventral. Aphilodon indespectus n. sp. (IBSP 3653): D, terminal part of the left antenna, lateral; E, terminal part of the last antennal article of the left antenna, lateral; F, claviform sensilla, ventral; G, specialized setae of type “a”, ventral; H, specialized setae of type “b”, ventral. Abbreviations: CSS: claviform sensilla; SSA: specialized setae of type “a”. SSB: specialized setae of type “b”. Scale bars: 0.5 (A–B), 0.1 (C–D), 0.025 (E), 0.005 (F–H) mm.

FIGURE 21. A–C, Aphilodon indespectus n. sp. Female paratype (IBSP 3653): A, forcipular segment, ventral; B, intermediate part of trunk, left side, lateral; C, terminal part of body, ventral. Color legend: red, scutellum; green, stigmatopleurite; lilac, posterior sclerite “I”; yellow, anterior sclerite “II”; light blue, anterior sclerite “III”; dark blue, anterior sclerite “III”. Abbreviations: TSU, tarsus. Scale bars: 0.3 mm (A–C).

FIGURE 22. A–E, Aphilodon indespectus n. sp. Female paratype (IBSP 3653): A, habitus, ventral; B, anterior part of body, dorsal; C, same, ventral; D, posterior part of body, dorsal; E same, ventral. Scale bars: 1 (A), 0.5 (B–E) mm.