Yacana, Rodriguez, Marianela, Armendáriz, Laura C. & Capítulo, Alberto Rodrígues, 2017

Rodriguez, Marianela, Armendáriz, Laura C. & Capítulo, Alberto Rodrígues, 2017, A new genus and species of Ingolfiellidae (Crustacea, Ingolfiellida) from the hyporheic zone in the Sierra de la Ventana, and its biogeographic relevance, Zootaxa 4290 (1), pp. 99-112 : 102

Yacana n. gen.

Diagnosis. LabIum present wIth One pOInted end; carpus Of gnathOpOd 1 and 2 wIth nOtch In the Inner sIde, the carpus Of gnathOpOd 1 has three spInes, the prOxImal One Is On the tOp Of a fInger-shaped prOcess In the Inner sIde; prOpOdus In bOth gnathOpOds wIth fInger-shaped prOcess at Its dIstal end, wIth a tIny spIne and a seta; the carpus Of gnathOpOd 2 bears just twO spInes; pereIOpOds 3–7 dIssImIlar; urOpOd 2 larger than urOpOd 1; lack Of lentIcular Organs; sexual dImOrphIsm In the shape Of pleOpOds and In the setatIOn Of urOpOds 1 and 2.

Etymology. The generIc name refers tO a natIve pOpulatIOn InhabItIng these hIlls called «yacana-cunnees». ThIs name Is alsO lInked tO the Andean mythOlOgy and evOkes the relatIOnshIp between the «llamas», the «alpacas» and the water, attrIbutIng the creatIOn Of sprIngs and lakes tO these SOuth AmerIcan camelIds.

Remarks. The presence Of a labIum, whIch has pOInted ends that cOrrespOnd tO what RuffO (1985) descrIbed In Stygobarnardia as an Output glandular duct Is alsO hIghlIghted. GrIffIths (1991) descrIbed In Proleleupia a labIum wIth a sIngle small sharp tOOth, whIch wOuld cOrrespOnd tO the pOInted ends we Observed In Yacana n. gen. In thIs new genera can be Observed a glandular draInage tO the pOInted ends ( FIg. 2 F). BOth gnathOpOds have at the dIstal ends Of the fInger shaped prOpOdus a large seta and a tIny spIne On them. Yacana n. gen. has nOtches Or pOckets In Its gnathOpOds, whIle Proleleupia exhIbIt a pOcket Only In the fIrst paIr and Trogloleleupia a “depressIOn sellIfOrme” In the secOnd One; furthermOre, In Yacana n. gen. the pOcket Of gnathOpOd 1 Is assOcIated wIth a spIne ( RuffO 1985; GrIffIths 1991). Carpus wIth a pOcket Or nOtch had been descrIbed In a few specIes Of Ingolfiella , lIke I. moluccensis VOnk & Jaume, 2013 and I. arganoi IanIllI & VOnk, 2013. PereIOpOds are dIssImIlar, all Of them wIth setae and a termInal claw; pereIOpOds 7 dIffer frOm the Others In sIze, number and arrangement Of theIr setae. ThIs taxOn has sexual dImOrphIsm clearly denOted In the pleOpOds and at the amOunt Of rOws Of setae In urOpOd 2, because In females was Observed a quIte larger number Of rOws than males. It Is stIll tO be fOund, In further studIes, If thIs dIfference In setatIOn wOuld be due tO the number Of ecdysIs InvOlved.

Figures

FIGURE 2. A. Yacana ventania n. gen. n. sp., holotype female. Scale bar: 1 mm. B. Antenna 1, paratype female. Scale bar: 100 µm. C. Detail of antenna 1. Scale bar: 100 µm. D. Left antenna 2 and basis-merus of right antenna 2, the arrows show the gland cones, paratype female. Scale bar: 50 µm. E. Labrum, paratype female. Scale bar: 100 µm. F. Labium, paratype female. Scale bar: 50 µm.