Benthana carijos, Costa & Campos-Filho & Araujo, 2014
Costa, Silvana Leal Nunes, Campos-Filho, Ivanklin Soares & Araujo, Paula Beatriz, 2014, New species and new records of Benthana Budde-Lund, 1908 (Isopoda: Oniscidea: Philosciidae) from southern Brazil, Papéis Avulsos de Zoologia (São Paulo) 54 (13), pp. 169-176 : 170-173
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Benthana carijos sp. nov.
Type material: Holotype male, Brazil, Santa Catarina, Anitápolis , road SC-407, between Anitápolis and Santa Rosa de Lima, 27°59’33”S, 49°06’48”W, open vegetation cover, impacted area, 25/VI/2012, leg. P.B. Araujo and B.L. Zimmermann ( MZUSP 30092 View Materials ) GoogleMaps . Paratypes 1 ♂, 2 ♀♀ same data as holotype ( MNRJ 23311 View Materials ) GoogleMaps ; São Paulo: 2 ♂♂, 5 ♀♀, 3 mancas, Cananéia , Ilha do Cardoso, 25°07’54”S, 47°57’59”W, nº 110, I/1979 ( MZUSP 24285 View Materials ) GoogleMaps , 2 ♂♂, 1 ♀, 2 mancas, Cananéia , Ilha do Cardoso, nº 106, 1979 ( MZUSP 24289 View Materials ) , 1 ♂, 1 ♀, 1? (without pleon), Cananéia, Ilha do Cardoso, nº 057, 1979 ( MZUSP 24290 View Materials ) .
Diagnosis: Antennule with 13+2 aesthetascs; male pleopod 1 exopod elongated, with low indentation,
not prominent dentiform protrusion, and narrow distal third.
Description: Maximum body length 14 mm, cephalothorax width 2.5 mm.
Light brown color. Cephalon with irregular unpigmented spots. Antenna with unpigmented proximal portion of the fourth article and distal portion of fifth article. Pereon with two lines of unpigmented longitudinal spots paramedially, a central line of unpigmented spots from the first pereonite to the fifth pleonite; epimera with large unpigmented spots. Telson with three unpigmented spots.
Body ( Fig. 1A View FIGURE 1 ) convex; dorsal surface smooth and bright, bearing few long piliform scale-setae ( Fig. 1B View FIGURE 1 ); pleon narrower than pereon with developed epimera; pereonites 1-4 with postero-lateral corners right-angled with rounded apices and posterior margins straight; pereonites 5-7 with postero-lateral corners gradually more acute and posterior margins gradually more arched; pleon epimera 3-5 developed, triangular, acute, and directed backwards. Cephalon ( Figs. 1C, D View FIGURE 1 ) with linea supra-antennalis sinuous; linea frontalis and lateral lobes lacking; clypeus and labrum similar in length; eyes with 21 ommatidia arranged in four rows. Pereonites ( Fig. 1E View FIGURE 1 ) with sulcus marginalis and glandular pores along the lateral margin. One line of noduli laterales per side ( Figs. 1 View FIGURE 1 E-G) with d/c coordinates reaching a maximum on pereonite 4; b/c coordinates gradually decreasing. Telson ( Fig. 1H View FIGURE 1 ) triangular with lateral margins slightly concave and right-angled apex.
Antennule ( Fig. 1I View FIGURE 1 ) triarticulate, distal article the longest, with 13 aesthetascs plus apical pair. Antenna ( Fig. 1J View FIGURE 1 ) when extended posteriorly reaches fifth pereonite, flagellum triarticulate, first article longest, second and third subequal in length; apical organ short, one sixth of the length of the distal article, free sensilla inserted near the base.
Mandibles ( Figs. 1K, L View FIGURE 1 ) with molar penicil consisting of at least 14 branches, pars intermedia with dense tuft of coniform setae, left mandible with three penicils, and right mandible with two penicils. Maxillule ( Fig. 1M View FIGURE 1 ) medial endite with two penicils, inserted transversely, distal portion rounded; outer endite with 4+6 teeth, five teeth of inner set pectinate (inner tooth bearing 16 denticles), one short and simple. Maxilla ( Fig. 1N View FIGURE 1 ) lateral lobe twice as wide as medial lobe with distal margin sinuous, covered with trichiform setae; medial lobe rounded, covered with trichiform setae. Maxilliped ( Fig. 1O View FIGURE 1 ) with rectangular base, cuticle scaled proximally, sparse piliform setae, and outer distal corner slightly prominent; endite rectangular, outer margin sinuous, distal margin rounded with two hook-like setae and medial seta overpassing distal margin, setose ventral sulcus ending in one strong tooth-like seta.
Pereopods ( Figs. 2A, B View FIGURE 2 ) rather slender, piliform setae on all articles, hyaline fringe and sparse setae on merus and carpus; carpus 1 with transverse antennagrooming brush and one seta with hand-like apex; ischium 7 triangular, bearing four long setae; dactylus 1-7 with inner claw reaching distal margin of outer claw, dactylar seta long and simple, ungual seta simple, not surpassing inner claw.
Uropod ( Fig. 2C View FIGURE 2 ) with protopod grooved on outer margin, endopod and exopod inserted almost at the same level, with few long setae along inner and outer margins; exopod slightly longer than endopod, with six setae on apex; endopod with three setae on apex.
Male: Genital papilla ( Fig. 2D View FIGURE 2 ) with triangular frontal shield distally rounded and two subapical orifices. Pleopod 1 ( Fig. 2E View FIGURE 2 ) exopod heart-shaped, elongated (ratio z:y 2.56), dentiform protrusion not prominent, rounded apex and distal margin with low indentation, outer lateral margin of respiratory area with six setae, and narrow distal third; endopod stout with median row of short setae on distal portion. Pleopod 2 ( Fig. 2F View FIGURE 2 ) exopod triangular, outer margin concave with about 12 setae; endopod slender and long. Pleopod 5 exopod ( Fig. 2G View FIGURE 2 ) triangular, outer margin slightly sinuous with four setae and transverse plumose fringe.
Etymology: The new species is named after the Carijós people native of southeastern and southern Brazil.
Remarks: The male pleopod 1 exopod of Benthana carijos sp. nov. is similar to that of B. bocainensis Lemos de Castro, 1958 , B. santosi Lemos de Castro, 1958 and B. schubarti Lemos de Castro, 1958 , by the not prominent dentiform protrusion and low indentation, but can be distinguished by the absence of lobe on the inner margin (vs. present in B. bocainensis ), and presence of setae on outer margin (vs. absent in B. santosi and B. schubarti ). Benthana carijos sp. nov. can also be distinguished by the number of aesthetascs on the antennule (16+2 vs. 8+ 2 in B. bocainenis , 9+ 2 in B. santosi , and 6+ 2 in B. schubarti ), uropod exopod slightly longer than endopod (vs. exopod twice as long as endopod in all three species), and the shape of the male pleopod 1 exopod with narrow distal third, an unique characteristic of this species.
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