Ischioscia perijaensis Carpio-Díaz, López-Orozco & Campos-Filho, 2020

Campos-Filho, Ivanklin Soares, López-Orozco, Carlos Mario, Carpio-Díaz, Yesenia M., Águiar, José Otávio & Navas, Gabriel R., 2020, Three new species of Ischioscia Verhoeff, 1928 (Isopoda, Oniscidea, Philosciidae) from Serranía de Perijá, Andean Cordillera, Colombian Caribbean, Zoosystema 42 (8), pp. 115-130 : 120

Ischioscia perijaensis Carpio-Díaz, López-Orozco & Campos-Filho n. sp.

( Figs 4-6 )

urn:lsid:zoobank.org:act:DC17E8EB-202D-4FBE-BB4A-40F721BD516A

TYPE MATERIAL. — Holotype. Colombia • ♂ (parts in micropreparations); Quebrada El Jordán, El Contento Village, San José de Oriente , La Paz , Cesar; 10°17’40.4”N, 72°55’52.1”W; 14.VIII.2015; C. M. López-Orozco leg.; CUDC-CRU 40 .

ETYMOLOGY. — The new species is named after the locality where the specimens were collected: Serranía de Perijá.

DESCRIPTION

Body size: 6 mm × 2.9 mm. Body as in Fig. 4A . Colour dark brown: antennal peduncle with first and second articles slightly pigmented, third to fifth article and flagellum strongly pigmented; cephalon with irregular unpigmented spots; pereon with longitudinal unpigmented spots on paramedian region, epimera with one unpigmented spot; pleon and telson strongly pigmented; uropods slightly pigmented ( Fig. 4A ). Dorsal surface bearing short triangular scale-setae ( Fig. 4B ). Cephalon ( Fig. 4C, D ) without lateral lobes, frontal line and supra-antennal slightly bent downwards medially; vertex dorsoventrally flattened with prominent compound eyes on lateral protrusions; eyes with 25 ommatidia arranged in four rows. Pleon ( Fig. 4A ) narrower than pereon, neopleurae 3-5 well developed and directed backwards. Telson ( Fig. 4E ) with lateral margins concave, apex rounded. Antennula ( Fig. 4F ) of three articles, distal article bearing six aesthetascs in three sets plus apical pair. Antenna ( Fig. 4G ) when extended posteriorly reaching anterior margin of pereonite 3; flagellum of three articles subequal in length, apical organ very long. Mandibles with molar penicil composed of 5 to 6 branches, left mandible ( Fig. 5A ) with 2+1 penicils, right mandible ( Fig. 5B ) with 1+1 penicils. Maxillula ( Fig. 5C ) inner endite with distal margin rounded bearing two stout hairy penicils; outer endite of 4+6 teeth, two of them with cleft apex. Maxilla ( Fig. 5D ) outer lobe twice as wide as inner lobe, distal margin rounded and covered with thin setae, two thick setae on inner portion; inner lobe rounded bearing thick setae. Maxilliped ( Fig. 5E ) basis rectangular bearing sparse setae; palp with two setae on proximal article; endite sub-rectangular, median seta surpassing distal margin, strong seta on distal outer portion, ventral surface setose. Uropod ( Fig. 5F ) protopod and exopod grooved on lateral margin, exopod longer than endopod, endopod inserted proximally. Pereopods 1-7 long and slender, carpus 1 with antennal grooming brush transverse; dactylus of two claws, inner claw not surpassing outer claw, ungual seta long, dactylar seta apically plumose. Pleopod exopods without respiratory areas.

Male

Pereopod 1 ( Fig. 6A ) with merus, carpus and propodus, and pereopod 2 merus and carpus bearing dense field of setae. Pereopod 7 ( Fig. 6B ) ischium with rounded depression on rostral surface, sternal margin bearing brush of thin setae on central part. Genital papilla ( Fig. 6C ) truncated apically, triangular ventral shield and two apical orifices. Pleopod 1 ( Fig. 6D ) exopod cordiform, inner margin almost straight, outer margin without lateral incision, distal margin rounded, lateral process short; endopod stout, almost twice as long as exopod, distal portion straight bearing row of small setae on medial margin and subapical lobe on outer margin. Pleopod 2 ( Fig. 6E ) exopod triangular, outer margin concave bearing several setae; endopod stout, slightly longer than exopod. Pleopods 3 and 4 as in Fig. 6F and G , respectively. Pleopod 5 ( Fig. 6H ) exopod rhomboid slightly wider than long, transverse rows of scales, outer margin sinuous bearing four setae, inner and outer margins densely covered with thin setae.

REMARKS

Ischioscia perijaensis Carpio-Díaz, López-Orozco & Campos- Filho n. sp. is readily distinguishable from their congeners in having the male pereopod 1 carpus not enlarged, the male pereopod 7 ischium with a rounded depression on rostral surface, and the male pleopod 1 exopod cordiform with lateral process short and outer margin lacking the lateral incision. In addition, I. perijaensis Carpio-Díaz, López-Orozco & Campos-Filho n. sp. differs from I. herrerai López-Orozco, Carpio-Díaz & Campos-Filho n. sp. in having the male pereopod 1 carpus not enlarged, the male pereopod 7 ischium without lobe and in the shape of the male pleopod 1 exopod.

Figures

FIG. 4. — Ischioscia perijaensis Carpio-Díaz, López-Orozco & Campos-Filho n. sp., male paratype (CUDC-CRU 40): A, habitus, dorsal view; B, dorsal scale-seta; C, cephalon, dorsal view; D, cephalon, frontal view; E, pleonite 5 and telson; F, antennula; G, antenna. Scale bar: 1 mm.

FIG. 5. — Ischioscia perijaensis Carpio-Díaz,López-Orozco & Campos-Filho n. sp.,male paratype (CUDC-CRU 40).A, left mandible;B, right mandible;C, maxillula inner endite (right), outer endite (left); D, maxilla; E, maxilliped; F, uropod.

FIG. 6. — Ischioscia perijaensis Carpio-Díaz, López-Orozco & Campos-Filho n. sp., male paratype (CUDC-CRU 40): A, pereopod 1; B, pereopod 7; C, genital papilla; D, pleopod 1, exopod (right), endopod (left); E, pleopod 2; F, pleopod 3; G, pleopod 4; H, pleopod 5.