Paracymbiomma bocaina Rodrigues & Cizauskas & Rheims 2018, sp. nov.

Paracymbiomma bocaina sp. nov.

Figs 5, 12, 14, 61–64, 73, 75

Type material. Male holotype from Brazil, Pará, Canaã dos Carajás (FLONA Carajás), Cave S11-07, (06°27'20''S 50°14'30''W), 24 February–04 March 2010, I. Cizauskas et. al. leg., deposited in IBSP 174166. Paratypes: one male from same data of holotype (IBSP 199034); one female from Brazil, Pará, Canaã dos Carajás (Serra da Bocaína), Cave SB-72, (06°16'52''S 49°55'39''W), 29 August–27 September 2012, C.A.J. Souza et al. leg. (IBSP 174167).

Etymology. The specific name is a noun in apposition and refers to the locality of the paratype.

Diagnosis. Males of P. bocaina sp. nov. resemble those of P. angelim sp. nov. and P. doisirmaos sp. nov. in having six eyes (Figs 14–16). They differ by PME poorly developed, almost vestigial, palp with ovoid tegulum (rounded in P. angelim sp. nov. and in P. doisirmaos sp. nov.) and embolar insertion at 3 o’clock position (embolar insertion between 9-12 o’clock position in P. angelim sp. nov. and P. doisirmaos sp. nov.) (Figs 61, 62). Females resemble those of P. caecus sp. nov. by the epigyne with circular atrium and vulva with copulatory duct with thicker laterals and distal part of translucent duct without loop (Fig. 64). They are distinguished from the latter species by the presence of eyes and posterior margin of epigynal plate slightly recurved (procurved in P. caecus sp. nov.) (Figs 63, 64).

Description. Male (holotype). Total length: 3.25. Carapace 1.35 long, 1.05 wide; abdomen 1.6 long, 0.95 wide; sternum 0.82 long, 0.65 wide; spinnerets ALS 0.34 long, 0.12 wide. Six eyes. AME absent. PME reduced. Eyes diameters and interdistances: ALE 0.05; PLE 0.025; PME 0.016; ALE–ALE 0.11; PLE–ALE 0.016; PME– ALE 0.025; PME–PME 0.066. Chelicerae 0.51 long; 2 retromarginal short and sparse teeth and 3 promarginal teeth. Leg formula 4123; measurements: I: 4.1 (1.25, 0.6, 0.9, 0.7, 0.65); II: 3.7 (1.08, 0.55, 0.83, 0.68, 0.58); III: 3.3 (0.95, 0.45, 0.62, 0.65, 0.62); IV: 4.55 (1.2, 0.63, 1.03, 0.93, 0.78). Leg spination: I – femur d1-1-0, p0-1-0; tibia v2-2 -0; metatarsus v2 -0-0. II – femur d1-1-0, p0-0-1; tibiap0-0-1, v2-2 -0; metatarsus v2 -0-0. III – femur d2-1- 3; tibia d0-1-0, p1-0-1, r1-0-1, v1 p-2-2; metatarsus p1-0-1, r1-0-1; v1 -0- 2. IV – femur d2-1-3; tibia d1-1-0, p1-0-1, r1-0-1, v1 p-2-2; metatarsus d1-0-0, p1-0-1, r1-0-1, v1-1 -2. Palp: femur with four spines, three dorsal (one median and two posterior) and one posterior prolateral; RTA with tapered and curved tip; median apophysis large with small hook at distal part, apically directed; embolar insertion with reservoir ventral and visible retrolaterally (Figs 61, 62).

Female: (paratype). Total length: 2.9. Carapace 1.3 long, 0.95 wide; abdomen 1.5 long, 0.9 wide; sternum 0.8 long, 0.65 wide; spinnerets ALS 0.3 long, 0.1 wide. AME absents. PME reduced. Eyes diameters and interdistances: ALE 0.041; PLE 0.033; PME 0.016; ALE–ALE 0.15; PLE–ALE 0.025; PME–ALE 0.066; PME– PLE 0.083; PME–PME 0.083. Chelicerae 0.55 long; two retromarginal short and sparse teeth and three promarginal teeth. Leg formula 4123; measurements: I: 3.6 (1.03, 0.58, 0.80, 0.63, 0.58); II: 3.35 (0.93, 0.55, 0.70, 0.60, 0.58); III: 2.97 (0.85, 0.42, 0.57, 0.57, 0.55); IV: 4.15 (1.03, 0.58, 0.95, 0.88, 0.73). Leg spination: I – femur d1-1-0, p0-1-0; tibia v2-2 -0; metatarsus v2 -0-0. II – femur d1-1-0; tibia v1 r-2-0; metatarsus v2 -0-0. III – femur d2- 1-1p; tibia p1-0-1, r0-0-1, v1 p-2-2; metatarsus p1-0-0, v2 -0- 2. IV – femur d1-1-0, r0-0-1; tibia d1r-1-0, p1-0-1, r1- 0-1, v1 p-2-2; metatarsus p1-0-1, r2-0-0, v1 p-2-1. Epigyne: copulatory duct ventrally visible with part of duct elongated and curved medially; atrium with sclerotized anterior and lateral margin (Fig. 63). Vulva: secondary spermathecae slightly oval, poorly defined on long thick stalk (Fig. 64).

Variation. Total length (2 males): 2.68–3.25.

Distribution. Pará, Brazil (Fig. 75).

Other material examined. None.

Natural history. Paracymbiomma bocaina sp. nov. was collected in two different caves distant approximately 40 km from each other. The male was collected in a paleo burrow (Fig. 77), an excavation of Plio-Pleistocene produced by large extinct mammals that used these structures for temporary or permanent inhabiting. They are structures of bioerosion and occur in the form of unobstructed galleries, allowing access to their interior (Buchmann et al. 2016). The two specimens were located in disphotic zone with high humidity and, as for the other species, were collected on the cave floor. Differently from P. carajas sp. nov, P. bocaina sp. nov. shows morphological characteristics that can be associated to a restriction to the subterranean environment, such as a more prominent eye reduction.