Hyalella uva, Cardoso & Oliveira & Ferreira, 2025

Cardoso, Giovanna Monticelli, Oliveira, Marcus Paulo Alves De & Ferreira, Rodrigo Lopes, 2025, Widespread yet hidden in darkness: new troglobitic Hyalella species from Brazilian caves (Amphipoda: Hyalellidae), Zootaxa 5692 (3), pp. 519-540 : 533-537

publication ID	https://doi.org/10.11646/zootaxa.5692.3.5
publication LSID	lsid:zoobank.org:pub:24A7DEA6-67A6-4ABE-A2F5-4077BC3556D0
DOI	https://doi.org/10.5281/zenodo.17321974
persistent identifier	https://treatment.plazi.org/id/FD4F87B4-FFA9-7E1C-D09D-FB38ABE2FC8E
treatment provided by	Plazi
scientific name	Hyalella uva
status	sp. nov.

Treatment

Hyalella uva sp. nov.

urn:lsid:zoobank.org:act:

Figures 1 View FIGURE 1 , 12– 14 View FIGURE 12 View FIGURE 13 View FIGURE 14 , 15E View FIGURE 15

Type material: Brazil, Rio Grande do Sul state, Santa Tereza municipality, Nossa Senhora da Uva cave (-29,1696º -51,6917º): Holotype ♂ (ISLA97013), 21.XI.2024, leg. Grupo Salamanca. Paratypes: 1♀ ( ISLA 97014 ), same data as holotype; 1♂, 1♀ ( ISLA 970135 , in slides), same data as holotype, XI.2023 .

Diagnosis: Eyes absent; antenna 1 longer than antenna 2; flagellum of 15–16 articles. Antenna 2 flagellum with 9-¿10 articles as long as peduncle. Male gnathopod 1 propodus ventral face with five serrate setae; carpus longer than wide, shorter than propodus; base with long setae on posterior margin; uropod 1 inner ramus dorsally glabrous, with five cuspidate apically; outer ramus setose with eight dorsal cuspidate setae with accessory seta and five cuspidate setae apically; telson apex with two long simple setae.

Description

Male: Body length of 3 mm; cephalothorax length of 0.3 mm. Body surface smooth. Epimeral plates not acuminate. Cephalothorax slightly longer than first thoracic segment, rostrum absent. Eyes absent ( Fig. 15E View FIGURE 15 ). Antenna 1 ( Fig. 12A View FIGURE 12 ) longer than antenna 2; flagellum of 15–16 articles, longer than peduncle. Antenna 2 ( Fig. 12B View FIGURE 12 ) less than half body length, peduncle longer than cephalothorax, flagellum with 10 articles as long as peduncle. Mandible ( Fig. 12C,D View FIGURE 12 ) incisor with six teeth; left mandible lacinia mobilis with bifid apex, denticulated, setal row with three long pappose setae; right mandible lacinia mobilis with five teeth; and three pappose setae; molar large, cylindrical, and triturative; accessory seta present. Upper-lip ( Fig. 12E View FIGURE 12 ) margin rounded, and distal margin covered by setules on ventral and dorsal faces. Lower-lip ( Fig. 12F View FIGURE 12 ) bilobed, outer lobes rounded with setules on ventral and dorsal faces, outer margin smooth. Maxilla 1 ( Fig. 12H View FIGURE 12 ) palp short, uniarticulate, longer than wide, with one strong seta; inner plate slender, smaller than outer plate, with two strong pappose apical setae and several simple setae on inner and outer margin; outer plate with one plumose seta and seven serrate setae. Maxilla 2 ( Fig. 12G View FIGURE 12 ) inner plate shorter than outer plate, with two strong papposerrate setae, medial margin with several simple and serrate setae on anterior margin. Maxilliped ( Fig. 12I View FIGURE 12 ) inner plates apically rounded, with three cuspidate and pappose setae apically, medially and outer margin; outer plate as wide as inner plate, apically rounded with apical and medial simple setae; palp longer than outer plate, with four articles, with simple setae; dactylus unguiform, shorter than article 3, without comb scales; distal setae simple and shorter than nail, inner margin with setae, distal nail present.

Gnathopod 1 ( Fig. 12J View FIGURE 12 ) subchelate; dactylus claw-like, with comb scales and one plumose seta on distal margin; propodus length less than two times maximum width, hammer shaped, ventral face with five short setae, several small simple setae on margin, anterodistal margin with cluster of simple setae, posterodistal margin with two strong cuspidate setae with accessory seta, and comb scales, palm longer than posterior margin; carpus longer than wide, shorter than propodus, posterior lobe with pectinate border with several serrate setae; ischium and merus with simple setae on posterodistal margin, base with long setae on posterior margin.

Gnathopod 2 ( Fig. 12K View FIGURE 12 ) subchelate; dactylus claw-like, long, surpassing haft propodus length, without comb scales; propodus ovate, length about 1.5 maximum width, posterodistal margin with two strong and short cuspidate setae with accessory seta, palm slope oblique, longer than posterior margin, with several cuspidate setae with accessory seta and simple setae; carpus wider than long with posterior lobe elongated, border pectinate with several pappose setae; base, ischium and merus with simple setae on posterior margin.

Pereopods 3 and 4 ( Fig. 13A,B View FIGURE 13 ) similar in size and shape, with propodus, carpus, merus, ischium, and base with several simple and cuspidate setae with accessory seta on posterior and anterior margin, dactylus less than half the length of propodus, coxal plate rectangular, with coxal plate 4 excavated posteriorly; both with small simple seta on margin. Pereopod 5 ( Fig. 13C View FIGURE 13 ) slightly shorter than pereopods 3 and 4, coxal plate trapezoidal. Pereopods 6 and 7 ( Fig. 13D,E View FIGURE 13 ) longer than others, coxal plate progressively reduced, dactylus less than half the length of propodus.

Pleopods not modified; peduncle slender, shorter than rami, with two coupling spines distally; rami with several plumose setae on both margins.

Uropod 1 ( Fig. 13F View FIGURE 13 ) longer than uropod 2; peduncle longer than rami, with six dorsal cuspidate setae with accessory seta; rami similar in length; inner ramus with five cuspidate apically, dorsally glabrous; outer ramus with eight dorsal cuspidate setae with an accessory seta and five cuspidate setae apically. Uropod 2 ( Fig. 13G View FIGURE 13 ) peduncle as long as rami, with five dorsal setae; rami subequal in length; inner ramus with one dorsal cuspidate seta with accessory seta and six cuspidate setae apically; outer ramus with four dorsal cuspidate setae with accessory seta and five distal setae. Uropod 3 ( Fig. 13H View FIGURE 13 ) shorter than other uropods; peduncle slender, wider than ramus, peduncle slightly longer than wide, with one distal cuspidate seta with accessory seta; outer ramus uniarticulate, with three cuspidate setae and one long simple seta apically.

Telson ( Fig. 13I View FIGURE 13 ) as long as wide, entire, apically rounded, bearing two long setae on distal margin.

Coxal gills sac-like, present on gnathopod 2 to pereopod 6. Sternal gills tubular, present on segments 2 to 7.

Female ( Fig. 14 View FIGURE 14 ). Body length of 4.6 mm; cephalothorax length of 0.4 mm. Antenna 1 ( Fig. 14A View FIGURE 14 ) flagellum of 15 articles. Antenna 2 ( Fig. 14B View FIGURE 14 ) flagellum of 10 articles. Gnathopod 1 ( Fig. 14C View FIGURE 14 ) similar in size and shape to gnathopod 1 for male; propodus inner face with eight serrate setae, anterodistal and posterodistal with comb scales; carpus with a large posterior lobe with pectinate border with a row of several serrate setae and without comb scales, inner face with six serrate setae; base, ischium and merus with posterior margin without comb scales. Gnathopod 2 ( Fig. 14D View FIGURE 14 ) propodus rectangular, more elongated than gnathopod 1, with length about than two times maximum width, subchelate, palm transverse; propodus inner face with four serrate setae, anterodistal and posterodistal margin with comb scales; carpus with a large posterior lobe with pectinate border with a row of several serrate setae and without comb scales, inner face with four serrate setae; base, ischium and merus with posterior margin without comb scales. Uropod 1 ( Fig. 14E View FIGURE 14 ) longer than uropod 2; peduncle longer than rami, with seven dorsal cuspidate setae; rami similar in length; inner ramus with five cuspidate apically and dorsally glabrous; outer ramus with eight dorsal cuspidate setae with an accessory seta and five cuspidate setae apically. Uropod 2 ( Fig. 14F View FIGURE 14 ) peduncle as long as rami, with four dorsal setae; rami subequal in length; inner ramus with one dorsal cuspidate seta with accessory seta and five cuspidate setae apically; outer ramus with six dorsal cuspidate setae with accessory seta and four distal setae.

Uropod 3 ( Fig. 14G View FIGURE 14 ) and telson ( Fig. 14H View FIGURE 14 ) similar to males.

Etymology: The epithet uva refers to the locality (Nossa Senhora da Uva cave) where all known specimens were collected. The cave is a touristic site with a sanctuary to the Virgin Mary.

Morphological remarks: Among the troglomorphic species Hyalella uva sp. nov. resembles H. formosa , H. imbya and H. epikarstica by the elongation of the antenna 1 in relation to antenna 2, with a greater number of articles (11–13 on antenna 1 and 8–10 in antenna 2; 18–23 on antenna 1 and 14–16 in antenna 2; 9 on antenna 1 and 7 in antenna 2, respectively), however, in these three species the male presents the curved setae on uropod 1, not seen in Hyalella uva sp. nov.; and in the number of setae on the ventral face of gnathopod 1 propodus with 3, versus 5, 7, and 4, respectively ( Rodrigues & Bueno, 2012; Cardoso et al. 2014; Rodrigues et al. 2014).