Pectenoniscus liliae Campos-Filho, Bichuette & Taiti,

Campos-Filho, Ivanklin Soares, Fernandes, Camile Sorbo, Cardoso, Giovanna Monticelli, Bichuette, Maria Elina, Aguiar, José Otávi, 2019, Two new species and new records of terrestrial isopods (Crustacea, Isopoda, Oniscidea) from Brazilian caves, Zootaxa 4564 (2), pp. 422-448: 430-434

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Pectenoniscus liliae Campos-Filho, Bichuette & Taiti

sp. n.

Pectenoniscus liliae Campos-Filho, Bichuette & Taiti  sp. n.

Figs 8–10View FIGURE 8View FIGURE 9View FIGURE 10, 17CView FIGURE 17

Zoobank. .

Pectenoniscus  sp. 2 Gallão & Bichuette, 2018: 12, table 2.

Etymology. The new species is named after Lília Senna-Horta, speleologist of the Grupo Bambuí de Pesquisas Espeleológicas (GBPE), who collected part of the material examined here and greatly contributed to the knowledge of the Brazilian subterranean fauna and its conservation.

Material examined. Holotype Bahia, Coribe: male ( LES 14350View Materials), Caverna Chico Pernambuco cave, 13°49’10”S, 44°04’15”W, 28 July 2012, leg. M.E. Bichuette, J.E. Gallão, L. Senna-Horta and P.P. Rizzato.GoogleMaps  Paratypes 1 male (in micropreparations), 2 females (one in micropreparations) ( LES 6449View Materials), same data as holotypeGoogleMaps  ; 1 female ( LES 6419View Materials), Gruna do Enfurnado cave , 13°38’45.69”S, 44°12’8”W, 24 November 2006, leg. E. Trajano and D. SansoneGoogleMaps  ; 1 female ( LES 6420View Materials), same locality, 5 May 2007, leg. E. Trajano and D. Sansone.GoogleMaps 

Description. Maximum body length: male 3 mm, female 2.5 mm.

Body outline as in Fig. 8AView FIGURE 8. Dorsal scale-setae tricorn-shaped ( Fig. 8CView FIGURE 8). Dorsal granulations diminishing in size from cephalon to pereonite 7; granules disposed in three rows on pereonite 1 and two rows on pereonites 2 to 7 ( Figs 8A, BView FIGURE 8, 17CView FIGURE 17). Cephalon ( Figs 8A, BView FIGURE 8, 9AView FIGURE 9) with quadrangular antennal lobes obliquely directed and slightly grooved dorsally; suprantennal line almost straight. Pereonites 1 and 2 with posterior margins straight, pereonites 3–7 gradually arched; pereonite 1 with anterior corners not surpassing median portion of cephalon ( Fig. 8A, BView FIGURE 8). Pleon with epimera 3–5 reduced ( Fig. 8AView FIGURE 8). Telson ( Fig. 9BView FIGURE 9) with distal margin rounded.

Antennula ( Fig. 9CView FIGURE 9) with distal article longest bearing nine aesthetascs. Antenna ( Fig. 9DView FIGURE 9) short, slightly surpassing pereonite 3; flagellum of three articles longer than fifth article of peduncle, apical organ as long as distal article of flagellum.

Right mandible ( Fig. 9EView FIGURE 9) with lacinia mobilis cleft and one penicil, left mandible ( Fig. 9FView FIGURE 9) with two penicils. Maxillula ( Fig. 9GView FIGURE 9) inner endite with one stout penicil on distal margin and two lateral penicils, proximal one longest; outer endite with of 4+5 simple teeth and two plumose stalks. Maxilla ( Fig. 9HView FIGURE 9) of two rounded lobes covered with thick and thin setae. Maxilliped ( Fig. 9IView FIGURE 9) with palp bearing two setae, subequal in length, on proximal article, and many setae on outer margin; endite subrectangular, distal margin with two triangular spines and stout hairy penicil.

Uropod ( Fig. 10AView FIGURE 10) protopod subquadrangular, exopod longer than endopod.

Pereopod 1 ( Fig. 10BView FIGURE 10) carpus with longitudinal antennal grooming brush, pereopods 6 and 7 ( Fig. 10C, DView FIGURE 10) bearing water conducting system; dactylus with dactylar seta bifid bearing thin setae.

Male. Pereopods 6 and 7 propodus with dense tufts of setae on tergal margin ( Fig. 10C, DView FIGURE 10); pereopod 7 ischium with convex sternal margin. Genital papilla ( Fig. 10EView FIGURE 10) enlarged on medial portion, apical portion narrow and elongated. Pleopod 1 ( Fig. 10FView FIGURE 10) protopod subrectangular, almost three times as wide as long, outer margin cleft bearing thin setae; exopod triangular; endopod twice as long as exopod. Pleopod 2 ( Fig. 10GView FIGURE 10) protopod subrectangular; exopod ovoid, twice as wide as long; endopod with distal article three times as long as proximal article, apical portion chela-shaped with two triangular lobes. Pleopod 3–5 exopods ( Fig. 10View FIGURE 10 H–J) subquadrangular, bearing four to five setae, outer margin convex.

Remarks. The genus Pectenoniscus  was erected by Andersson (1960) to include the new species P. angulatus  from Nova Teutônia, state of Santa Catarina. After the original description of this species, many surveys have been conducted in the type locality but the species has never been recollected.

Pectenoniscus liliae  sp. n. shows all the characters of the genus as listed by Andersson (1960), except for the epimera of the pleonites which are well developed in P. angulatus  and reduced in the new species. This character may be a specific rather than a generic character. One of the most remarkable characteristics of the genus is the arrangement of the aesthetascs on the distal article of the antennule. These aesthetascs are stout, long and longitudinally arranged in one line from the median to the apical portion of the distal article, resembling a comblike structure.

The new species is readily distinguishable from P. angulatus  in having quadrangular instead of triangular antennal lobes, reduced pleon epimera, male pereopod 7 ischium not enlarged, and the complex chela-shaped apex of the male pleopod 2 endopod.

This species is considered here as troglobiotic and endemic to two caves from Serra do Ramalho karst area, state of Bahia, northeastern Brazil: Chico Pernambuco and Gruna do Enfurnado. As previously stated, the caves are not legally protected and their surrounding is used mainly for agriculture and pasture activities; moreover, the area is also threatened by future installation facilities for mining activities. However, both caves are relatively isolated and Chico Pernambuco is a technical one, with no impact related to tourism or uncontrolled visitation. The specimens of the new species of Pectenoniscus  were collected in extremely humid substrate, composed by silt and organic matter (bat guano and vegetal debris), always close to water bodies.


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Pectenoniscus liliae Campos-Filho, Bichuette & Taiti

Campos-Filho, Ivanklin Soares, Fernandes, Camile Sorbo, Cardoso, Giovanna Monticelli, Bichuette, Maria Elina, Aguiar, José Otávi 2019


Gallao, J. E. & Bichuette, M. E. 2018: 12