Ischioscia perijaensis Carpio-Diaz, Lopez-Orozco & Campos-Filho 2020, n. sp.
Creators: name: Campos-Filho, Ivanklin Soares
name: López-Orozco, Carlos Mario
name: Carpio-Díaz, Yesenia M.
name: Águiar, José Otávio
name: Navas, Gabriel R.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Philosciidae
Ischioscia
Ischioscia perijaensis

description: 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.
description: Published as part of 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, pp. 115-130 in Zoosystema 42 (8) on page 120, DOI: 10.5252/zoosystema2020v42a8, http://zenodo.org/record/3726211