Pudeoniscus obscurus Lemos de Castro, 1973

Campos-Filho, Ivanklin Soares, Teixeira Lisboa, Jonathas & Monticelli Cardoso, Giovanna, 2018, A new genus and two new species of Pudeoniscidae Lemos de Castro 1973 (Crustacea: Isopoda: Oniscidea) from Brazil, Journal of Natural History (J. Nat. Hist.) 52 (7 - 8), pp. 457-482 : 463-467

publication ID	https://doi.org/ 10.1080/00222933.2018.1437229
publication LSID	lsid:zoobank.org:pub:A0123730-C623-49CE-8665-AE17FDDF994A
persistent identifier	https://treatment.plazi.org/id/03D187B1-FFA6-FFC5-FEF1-FA2A25D1F396
treatment provided by	Felipe
scientific name	Pudeoniscus obscurus Lemos de Castro, 1973
status

Treatment

Pudeoniscus obscurus Lemos de Castro, 1973 View in CoL

( Figures 2 – 5 View Figure 2 View Figure 3 View Figure 4 View Figure 5 , 14 View Figure 14 (b))

Pudeoniscus obscurus Lemos de Castro, 1973: 4 View in CoL , figures 1 and 2; Souza-Kury 1998: 665; Leistikow and Wägele 1999: 43; Schmalfuss, 2003: 226; Magrini et al. 2010:218, 2011: 65, table II.

Pudeonisucs [sic!] obscurus ; Furlan, 1996: 18.

nec Pudeoniscus obscurus View in CoL ; Lisboa et al. 2013: 394, figure 1D.

Type material examined

Paratypes São Paulo: 1 ♀ ( MNRJ 6218 View Materials ), Santos, Rio da Maria , 30 July 1942, leg . Otto Schubart , det . Alceu Lemos de Castro; 1 ♀ ( MNRJ 6219 View Materials ), Boracéia, Estação Ecológica da Boracéia , leg . Otto Schubart .

Additional material

São Paulo, Mogi das Cruzes, Parque das Neblinas, leg . M . Magrini: 1 ♂ ( UFRGS 6203 View Materials ), 3 January 2006, 1 ♀ ( UFRGS 6204 View Materials ), 20 March 2006, 1 ♀ ( UFRGS 6205 View Materials ), 20 March 2006, 1 ♀ ( UFRGS 6206 View Materials ), 11 February 2006 .

Previous records

São Paulo: Rio da Maria Santos, São Paulo (Boracéia and Santo Amao), and Santos ( Lemos de Castro 1973); Ilha do Bom Abrigo and Ilha Montão de Trigo ( Furlan 1996); Mogi das Cruzes (Parque das Neblinas) ( Magrini et al. 2010, 2011).

Re-description

Maximum body length: ♂ 9 mm, ♀ 9.6 mm. Habitus in lateral view as in Figure 2 View Figure 2 (a). Color as described by Lemos de Castro (1973): dark brown with distinct pigmented line on posterior margins of cephalon, pereonites 1 – 7 and pleonites 1 – 5; cephalon with irregular unpigmented spots on dorsal surface, lateral lobes strongly pigmented; antenna with fifth article of peduncle and flagellum unpigmented; pereon with unpigmented areas on paramedian and median regions, epimera strongly pigmented; pleonites 1 – 5 with three large unpigmented areas, neopleurae strongly pigmented; telson strongly pigmented; uropods slightly pigmented. Cephalon ( Figure 2 View Figure 2 (b, c)) with lateral lobes slightly bent upwards, frontal shield with lateral sides almost straight; eyes consisting of 20 – 22 ommatidia. Dorsum ( Figure 2 View Figure 2 (a)) with ribs slightly developed on median and paramedian areas of pereonites 1 – 7, one pair of lateral distinct ribs on pereonites 1 – 7 gradually closer to posterior margin; noduli laterales very short inserted on lateral ribs. Pereonites 1 – 3 with ventral lobes rounded and well developed, more conspicuous on pereonites 1 and 2 ( Figure 2 View Figure 2 (d)). Pleon ( Figure 2 View Figure 2 (a, e)) with neopleura 5 not surpassing distal margin of telson; telson with narrow dorsal depression, proximal portion twice as wide as distal portion, lateral sides concave. Antennula ( Figure 2 View Figure 2 (f)) with proximal and distal articles subequal in length, distal article with three subapical aesthetascs plus apical pair. Antenna ( Figure 2 View Figure 2 (g)) with distal article of peduncle almost twice as long as flagellum; second article of flagellum twice as long as distal article, distal article bearing one lateral aesthetasc. Mandible with molar penicil of about eight branches, right mandible ( Figure 3 View Figure 3 (a)) with 1 + 1 penicils, left mandible ( Figure 3 View Figure 3 (b)) with 2 + 1 penicils. Maxillula ( Figure 3 View Figure 3 (c)) inner endite bearing two hairy penicils, distal margin with lateral tip; outer endite of 4 + 4 teeth, inner set with cleft apex. Maxilla ( Figure 3 View Figure 3 (d)) with inner and outer lobes rounded, inner lobe covered with thick setae, outer lobe twice as wide as inner lobe. Maxilliped ( Figure 3 View Figure 3 (e)) palp with two distinct setae on proximal article; endite subrectangular densely covered with thin setae, median seta strong, surpassing distal margin. Pereopods 1 – 7 with sternal setae sparse, carpus 1 with distal seta serrate at apex; dactylus with inner claw reaching distal margin of outer claw, dactylar seta pilose at apex. Uropod ( Figure 4 View Figure 4 (a)) endopod about twice as long as exopod, exopod slightly grooved on outer margin. Pleopod 1 – 5 exopods with respiratory surface mostly exposed ( Figures 4 View Figure 4 (d – h), 5(a, b)).

Male: Pereopod 1 ( Figure 4 View Figure 4 (b)) merus and carpus slightly setose; pereopod 7 ( Figure 4 View Figure 4 (c)) ischium with distal ventral portion slightly depressed, proximal portion of merus with slight longitudinal depression bearing short setae. Pleopod 1 ( Figure 4 View Figure 4 (d)) exopod inner margin rounded, distal margin depressed on median portion, outer margin rounded and slightly irregular; endopod about twice as long as exopod, distal portion slightly bent outwards. Pleopod 2 ( Figure 4 View Figure 4 (e)) exopod triangular, outer margin concave; endopod rather slender and slightly longer than exopod. Pleopod 3 and 4 exopods as in Figure 4 View Figure 4 (f) and (g), respectively. Pleopod 5 exopod ( Figure 4 View Figure 4 (h)) rhomboid, inner portion covered with thin setae, distal margin straight, bearing five short setae.

Remarks

Pudeoniscus obscurus differs from P. birabeni in having fan-shaped dorsal scale-setae, a ventral lobe on pereonite 3, and a telson with sub-quadrangular distal portion, as well as in the shape of male pleopods 1 and 2.

Distribution

This species is recorded only from São Paulo state ( Figure 14 View Figure 14 (b)).

Kingdom	Animalia
Phylum	Arthropoda
Class	Malacostraca
Order	Isopoda
Family	Pudeoniscidae
Genus	Pudeoniscus