Aphilodon caboclos, 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 : 28-30

Aphilodon caboclos new species

( Figs 19–20 , 6A, K , 8 A–B, 10A)

Type specimens. Holotype: ♀, from Núcleo Caboclos, Parque Estadual Turístico do Alto Ribeira (PETAR), Apiaí, São Paulo, Brazil, 07/2016, V. Calvanese & A. Silva col., deposited in IBSP 4071 . Paratypes: 1♂ ( IBSP 4072 ) , 1♂, 1♀ ( IBSP 4073 ), same data as holotype .

Type locality. Brazil: São Paulo: Apiaí: Parque Estadual Turístico do Alto Ribeira (PETAR), Núcleo Caboclos : 24°26’57”S, 48°35’10”W .

Material examined. BRAZIL: São Paulo: Apiaí, Parque Estadual Turístico do Alto Ribeira (PETAR), Núcleo Caboclos (24°26’57”S, 48°35’10”W), 07/2016 , V. Calvanese & A. Silva col., 1♀ [holotype] ( IBSP 4071 ) , 1♂ [para- type] ( IBSP 4072 ) , 1♀, 1♂ [paratypes] ( IBSP 4073 ) .

Etymology. The epithet is a noun in apposition, referring to the type locality.

Diagnosis. A species of Aphilodon with: around 51–53 leg-bearing segments; known body length in adults 28– 40 mm; cephalic plate length/width ratio ca. 1.2; antenna ca. 2-3 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 longer than article 2, and with 1 apical seta, and 1 or 2 setae and 1 sensillum in subapical position; forcipular pretergite exposed; forcipule with lateral margin posteriorly straight; forcipule with 3+1 denticles; distal denticle of trochanteroprefemur, denticle of femur and denticle of tibia relatively large and denticle of tarsungulum relatively small; tarsungulum ca. 1.2 times as long as trochanteroprefemur+femur; each coxopleuron with 7–11 coxal pores in adults, all sparse; ultimate presternite exposed but apparently divided in middle part; metasternite of ultimate leg-bearing segment length/width ratio ca. 0.4; ultimate legs ca. 1.1 times as long as penultimate legs, with tarsus 1 ca. 1.3 times as long as tibia.

A. caboclos n. sp. differs from all other species of Aphilodon by having tarsungulum longer than trochanterop refemur+femur ( Figs 19B , 20C ); metasternite of ultimate leg-bearing segment length/width ratio <0.5 ( Figs 19C ; 20G );

Recorded specimens: 4, including 2♀ and 2♂, from a single locality.

Distribution. Brazil—São Paulo: Apiaí.

Description of holotype. Female (IBSP 4071).

Entire body: length 34, maximum width 0.6; body evenly brown, darker than in other species of Aphilodon , and with a black dorsal band extending along whole body; ventral side with dark spots, forming a band in some segments or concentrating on anterior and posterior margins of ST. Cephalic plate: sub-rectangular, length 0.56 and width 0.47 (length/width ratio 1.19), with little scattered SE. Antenna: length 1.3, 2.3 times as long as cephalic plate; AA II–XIII length/width ratio 0.52–0.92; LAA 1.7 times as long as AA XIII.

Clypeus: 3+3 LS, 1+1 PS, 18+16 SCS. Mandible: PL with 15 denticles. First maxillae: CFM more elongated than in other Aphilodon species, length 0.07 and width 0.15 (length/width ratio 0.48); left TFM length 0.05 (0.72 times as long as CFM) and width 0.05; DA with 3+3 subapical SL; MPC with 3+4 SL arranged in a row in middle part. Second maxillae: 6 little SE distributed along posterior margin of CSM, between TSM; left TSM length 0.08 (ca. 1.5 times as long as TFM) and maximum width (basal margin) 0.04; both TSM with 1 apical SE, and 2 subapical SE and 1 subapical SL.

Forcipular segment: FTE rectangular, slightly narrower in anterior part, length 0.29 (1/2 as long as cephalic plate) and width 0.58, with relatively large and sparse SE; FPT length 0.03 and width 0.25; FCX length 0.49 and width 0.53 (length/width ratio 0.92); FRL length 0.37, not reaching anterior margin of cephalic plate, with 2 denticles in TFF and 1 in TI, all relatively large; FD1 with 1 apical SE, FD2 with 1 apical and 2 subapical SE, FD3 with 2 apical and 1 subapical SE; TA with a little DT, 1.27 times as long as TFF.

Walking legs: 51 pairs; FL 0.77 times as long as the second leg, with procoxae extended to the midline of the body; leg 25 length 0.8. Tergum from the first to penultimate leg-bearing segment: TE rectangular, with slightly concave lateral edges; TE 25 length 0.26 and width 0.55 (length/width ratio 0.47), with sparse SE; PT 0.63 times as long as TE and with scattered SE. Sternum from the first to penultimate leg-bearing segment: STF oval, tapering to posterior part; other ST more elongated, with little scattered SE; ST 25 length 0.40 and width 0.27 (length/width ratio 1.48); PST present throughout body, divided only in 3 most anterior segments.

Ultimate leg-bearing segment: MTL wider than long, trapezoidal, length 0.16 and maximum width 0.37 (length/ width ratio 0.43); UPS apparently divided in middle part. Ultimate legs: thin, length 0.94, 1.14 as long as penultimate leg; each CXP with 9–9 COP, which are weakly grouped near MTL; tarsus 1 ca. 1.3 times as long as tibia. Postpedal segments: GF with 3+3 distal SE.

Known variation. Male: GM biarticulated; GM1 with 5–8 SE in two rows; GM2 with 9 scattered SE.

Figures

FIGURE 6. A–L, Aphilodontinae mandible, first and second maxillae. Aphilodon caboclos n. sp. (IBSP 4073): A, left mandible, dorsal; K, apex of article 3 of the left telopodite of second maxillae. Aphilodon silvestrii n. sp. (IBSP 3665): B, pectinate lamella of left mandible, dorsal; C, pectinate lamella of right mandible, ventral; D, denticles of pectinate lamella, dorsal; E, first maxillae, ventral; F, apex of telopodite and medial projection of the first maxillary coxosternite, ventral; G, sensilla on distal article of telopodite of first maxillae, ventral; H, setae on distal article of telopodite of first maxillae, ventral; I, left telopodite of second maxillae, ventral; J, sensilla on the second maxillae coxosternite, ventral; L, sensilla on article 2 of telopodite of second maxillae, ventral. Abbreviations: BA: basal article of the first maxillary telopodite; CFM: coxosternite of first maxillae; DA: distal article of first maxillary telopodite; MPC: medial projection of the first maxillary coxosternite; PL: pectinate lamella; SE: setae; SF: scute filaments; SL: sensilla. Scale bars: 0.05 (A–C, I–J), 0.005 (D, G–H, K–L) mm.

FIGURE 8. A–D, Aphilodontinae forcipule. Aphilodon caboclos n. sp. (IBSP 4073): A, forcipular segment, ventral; B, denticles of forcipules, ventral. Mairata butantan n. sp. (IBSP 3663): C, denticles of right forcipule, ventral. Aphilodon micronyx Brölemann, 1902 (IBSP 6176): D, right forcipule, ventral. Abbreviations: STF: sternite of first leg-bearing segment; TA: tarsungulum; TFF: trochanteroprefemur+femur; TI: tibia. Scale bars: 0.1 mm (A–D).

FIGURE 19. A–C, Aphilodon caboclos n. sp. Female paratype (IBSP 4073): A, first and second maxillae, ventral; B, forcipular segment, ventral; C, terminal part of body, ventral. Abbreviations: MTL: metasternite of the ultimate leg-bearing segment; TA: tarsungulum; TFF: trochanteroprefemur+femur; TFM: telopodite of first maxillae; TSM: telopodite of second maxillae. Scale bars: 0.1 mm (A–C).

FIGURE 20. A–G, Aphilodon caboclos n. sp. Female paratype (IBSP 4073): A, habitus, ventral; B, anterior part of body, dorsal; C, same, ventral; D, intermediate part of trunk, dorsal; E, same ventral; F, terminal part of body, dorsal; G, same, ventral. Scale bars: 2 (A), 0.5 (B–G) mm.