Paracymbiomma caecus, Rodrigues & Cizauskas & Rheims, 2018

Rodrigues, Bruno V. B., Cizauskas, Igor & Rheims, Cristina A., 2018, Description of Paracymbiomma gen. nov., a new genus of prodidomid spiders from the Neotropical region (Araneae: Prodidomidae) including a new troglobite species, Zootaxa 4514 (3), pp. 301-331: 322

publication ID

https://doi.org/10.11646/zootaxa.4514.3.1

publication LSID

lsid:zoobank.org:pub:B674EE1E-57C0-4FC5-B855-AED8FA6596EA

persistent identifier

http://treatment.plazi.org/id/8D1487E6-540E-FFAF-FF2D-F505FAF67136

treatment provided by

Plazi

scientific name

Paracymbiomma caecus
status

sp. nov

Paracymbiomma caecus   sp. nov

Figs 6 View FIGURES 1–6 , 13 View FIGURES 13–18 , 65–68 View FIGURES 65–68 , 74 View FIGURES 69–74 , 75 View FIGURES 75

Type material. Male holotype from Brazil, Pará, Canaã dos Carajás (FLONA Carajás), Cave S11D-17, (06°23'56''S 50°21'23''W), 13–31 January 2010, I. Cizauskas et. al. leg., deposited in IBSP 174169. Paratype: one female from Brazil, Pará, Canaã dos Carajás ( FLONA Carajás), Cave-0038 (CAV-38), (06°24'46''S 50°22'14''W), 22–28 September 2010, I. Cizauskas et. al. leg., deposited in ( IBSP 174170 View Materials ) GoogleMaps   .

Etymology. The specific name is a Latin adjective, caecus   (blind), in reference to the absence of eyes in this species.

Diagnosis. P. caecus   sp. nov. are distinguished from other congeners by the absence of eyes ( Fig. 13 View FIGURES 13–18 ); males resemble those of P. bocaina   sp. nov. by the ovoid tegulum and embolar insertion at 3 o’clock position, but differ by the very long tibia, as long as cymbium length ( Figs 65, 66 View FIGURES 65–68 ); females resemble those of P. bocaina   sp. nov. by the epigyne with circular atrium and vulva with copulatory duct with thicker laterals and distal part of translucent duct without loop, but are distinguished by posterior epigynal plate recurved (slightly procurved in P. bocaina   sp. nov.) ( Figs 67, 68 View FIGURES 65–68 ).

Description. Male (holotype). Total length: 3.9. Carapace 1.6 long, 1.35 wide; abdomen ALS 2.1 long, 1.05 wide; sternum 1.05 long, 0.8 wide; spinnerets 0.6 long, 0.2 wide. Eyes absent. Chelicerae 0.74 long; 2 retromarginal short and sparse teeth and 3 promarginal teeth. Leg formula 4123; measurements: I: 6.64 (1.64, 1.02, 1.6, 1.4, 0.98); II: 6.18 (1.6, 0.88, 1.5, 1.28, 0.92); III: 5.26 (1.4, 0.72, 1.12, 1.14, 0.88); IV: 7.08 (1.72, 0.84, 1.7, 1.7, 1.12). Leg spination: I (right leg) – femur d1-1-1, p0-1-1, r0-1-0; tibia v2-2 -2; metatarsus v4 -0-0. II – femur d1-1-0, p0-1-2, r0-1-1; tibia p0-0-1, v2-2 -2; metatarsus v4 -0-0. III – femur d1-1-1, p0-1-1, r0-1-1; tibia d1-0-0, p1- 0-1, r1-0-1, v2-2 -2; metatarsus d0-2-0; p0-1-1, r0-1-1, v2 -0- 2. IV – femur d1-1-1, p1-0-1, r1-0-1; tibia d1-1-0,p1-0- 1, r1-0-1, v2-2 -2; metatarsus p1-1-1, r2-0-1, v2-2 -2. Palp: femur with five dorsal spines, one median and four posterior; RTA tapered; median apophysis conical with small hook at distal part, apically directed; embolar insertion with reservoir ventral and retrolaterally visible ( Figs 65, 66 View FIGURES 65–68 ).

Female: (paratype). Total length: 4.15. Carapace 1.9 long, 1.42 wide; abdomen 2.1 long, 1.25 wide; sternum 1.15 long, 0.85 wide; spinnerets ALS 0.4 long, 0.16 wide. Eyes absents. Chelicerae 0.9 long; 2 retromarginal short and sparse teeth and 3 promarginal teeth. Leg formula 4123; measurements: I: 5.98 (1.64, 0.9, 1.4, 1.16, 0.88); II: 5.76 (1.64, 0.88, 1.28, 1.12, 0.84); III: 5.32 (1.48, 0.76, 1.08, 1.12, 0.88); IV: 7.04 (1.84, 0.84, 1.64, 1.60, 1.12). Leg spination: I – femur d1-1-0, p0-1-1; tibia v2-2 -2; metatarsus v4 -0-0. II – femur d1-1-0; tibia v2-2 -2; metatarsus v2- 1 r-0. III – femur d1-1-1, p1-0-1, r0-0-1; tibia d0-1-0, p1-0-1, r1-0-1, v2-2 -1r; metatarsus p1-0-1, r1-0-1, v4 -0- 1. IV – femur d1-1-1, p0-0-1, r0-0-1; tibia d1-0-1, p1-0-1, r1-0-1, v2-2 -1r; metatarsus p1-0-1, r1-0-1, v4 -0-1. Epigyne: copulatory duct visible ventrally with lateral part much thicker than median part ( Fig. 67 View FIGURES 65–68 ); atrium with sclerotized lateral margin. Vulva: secondary spermathecae small, rounded, on long narrow stalk ( Fig. 68 View FIGURES 65–68 ).

Distribution. Pará, Brazil ( Fig. 75 View FIGURES 75 ).

Other material examined. None.

Natural history. Paracymbiomma caecus   sp. nov. was collected in two small caves distant approximately 2 km from each other with horizontal projection between 10 m and 20 m in the region of Serra Sul (FLONA de Carajas). The male was collected in the small twilight zone in the cave, accessed through a 40 cm diameter hole ( Fig. 78 View FIGURES 76–79 ). The specimens were collected in disphotic zone with high humidity ( Fig. 79 View FIGURES 76–79 ). Differently from P. bocaina   sp. nov., the specimens show a combination of morphological characteristics, such as eye loss, depigmentation and appendage elongation that suggest a restriction to the subterranean environment.