Ischioscia herrerai López-Orozco, Carpio-Díaz & 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 : 116-120

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

( Figs 1-3 )

urn:lsid:zoobank.org:act:84046969-EDD0-4A8E-8175-7C645A1BB873

TYPE MATERIAL. — Holotype. Colombia • ♂; Quebrada El Jordán, El Contento Village, San José de Oriente , La Paz , Cesar; 10°17’40.4”N, 72°55’52.1”W; 13.VIII.2015; Y. Herrera-Medina leg.; CUDC-CRU 33 .

Paratypes. Colombia • 1 ♂ (part in micropreparations); same locality and date as for holotype; C. M. López-Orozco leg.; CUDC-CRU 45 • 1 ♀ (part in micropreparations); same locality and date as for holotype; C. M. López-Orozco leg.; CUDC-CRU 47 • 2 ♂, 3 ♀; same locality and date as for holotype; C. M. López-Orozco leg.; ICN-CI-86 • 12 ♂, 37 ♀; same locality and date as for holotype; C. M. López-Orozco leg.; CUDC-CRU-37 • 1 ♂, 13 ♀; Cerro Pintao, La Jagua del Pilar, La Guajira; 10°25’41.8”N, 72°56’8.3”W; 10.VIII.2015; C. M. López-Orozco leg.; CUDC-CRU-36 .

ETYMOLOGY. — The new species is named after Yeison Herrera- Medina who collected part of the specimens used in this study.

DESCRIPTION

Maximum body size: male 9 mm × 3.5 mm (holotype); female 9.8 mm × 3.8 mm. Body as in Fig. 1A . Colour dark brown: antennal peduncle with first and second articles slightly pigmented, third to fifth articles and flagellum strongly pigmented; cephalon with irregular unpigmented spots; pereon with longitudinal unpigmented areas on paramedian region, pereonites 4-7 with one longitudinal unpigmented spot on median portion, epimera with two distinct unpigmented spots near posterior portions; pleon, telson and uropod exopods strongly pigmented ( Fig. 1A ). Dorsal surface bearing short triangular scale-setae ( Fig. 1B ). Cephalon ( Fig. 1C, D ) lateral lobes and frontal line absent, supraantennal line almost straight; vertex dorsoventrally flattened with prominent compound eyes on lateral protrusions; eyes with 27 ommatidia arranged in four rows. Pleon ( Fig. 1A ) narrower than pereon, neopleurae 3-5 well developed and directed backwards. Telson ( Fig. 1E ) with lateral margins concave, apex rounded. Antennula ( Fig. 1F ) of three articles, distal article bearing six superimposed aesthetascs plus apical pair. Antenna ( Fig. 1G ) when extended posteriorly reaching anterior portion of pereonite 3; flagellum of three articles subequal in length, apical organ very long. Mandibles with molar penicil composed of seven branches, left mandible ( Fig. 2A ) with 2+1 penicils, right mandible ( Fig. 2B ) with 1+1 penicils. Maxillula ( Fig. 2C ) inner endite with distal margin rounded bearing two hairy penicils; outer endite of 4+5 teeth, two of them with cleft apex. Maxilla ( Fig. 2D ) outer lobe almost three times as wide as inner lobe, distal margin rounded and covered with thin setae, one thick seta on inner portion; inner lobe rounded bearing thick setae. Maxilliped ( Fig. 2E ) basis rectangular bearing sparse setae; palp with two setae on proximal article; endite sub-rectangular, rostral and caudal surfaces hairy, medial seta not surpassing distal margin. Uropod ( Fig. 2F ) protopod and exopod grooved on lateral margin, exopod as long as endopod, endopod inserted proximally. Pereopods 1-7 long and slender; carpus 1 with antennal grooming brush transverse and distal setae apically cleft; dactylus of two claws, inner claw not surpassing outer claw, ungual seta long, dactylar seta apically plumose. Pleopod exopods without respiratory areas.

Male

Pereopods 1-3 with carpus enlarged, rostral portion bearing dense field of setae. Pereopod 1 and 2 propodus and pereopods 1-3 merus bearing dense field of setae on rostral and sternal portions ( Fig. 3A ). Pereopod 7 ( Fig. 3B ) ischium with rounded lobe bearing one strong seta on caudal surface, and distal sternal portion prominent. Genital papilla ( Fig. 3C ) truncated apically, triangular ventral shield and two apical orifices. Pleopod 1 ( Fig. 3D ) exopod cordiform, inner margin slightly sinuous, outer margin with distinct lateral incision, apical lobe triangular, directed outwards; endopod stout, almost twice as long as exopod, distal portion straight with row of small setae on medial portion, apex rounded with subapical lobe on outer margin. Pleopod 2 ( Fig. 3E ) exopod triangular, outer margin concave bearing several setae; endopod stout, longer than exopod, apex pointed. Pleopods 3 and 4 as in Fig. 3F and G , respectively. Pleopod 5 ( Fig. 3H ) exopod triangular, transverse rows of scales, outer margin straight bearing five setae.

REMARKS

In the shape of the male pleopod 1 exopod Ischioscia herrerai López-Orozco, Carpio-Díaz & Campos-Filho n. sp. resembles I. martinae Leistikow, 1997 and I. muelleri Leistikow, 1997 , but it differs in the shape of the male pereopod 1-2 carpus and the presence of a lobe on the male pereopod 7 ischium. In having a lobe on the male pereopod 7 ischium I. herrerai López-Orozco, Carpio-Díaz & Campos-Filho n. sp. is similar to I. variegata (Dollfus, 1893) , I. panamaensis Leistikow, 1999 , I. marmorata Leistikow, 2000 , I. hirsuta Leistikow, 2001 , I. colorata Leistikow, 2001 , I. pariae Leistikow, 2001 , I. guamae Leistikow, 2001 , and I. trifasciata Leistikow, 2001 ; however, it differs from all these species in the colour pattern, shape of the male pereopods 1-3 carpus, of the lobe on the male pereopod 7 ischium, and of the male pleopod 1 exopod.

Figures

FIG. 1. — Ischioscia herrerai López-Orozco, Carpio-Díaz & Campos-Filho n. sp., female paratype (CUDC-CRU 47): A, habitus, dorsal view; B, dorsal scale-seta; C, cephalon, dorsal view; D, cephalon, frontal view; E, telson; F, antennula; G, antenna. Scale bar: 1 mm.

FIG. 2. — Ischioscia herrerai López-Orozco, Carpio-Díaz & Campos-Filho n. sp., female paratype (CUDC-CRU 47): A, left mandible; B, right mandible;C, maxillula inner endite (right), outer endite (left); D, maxilla; E, maxilliped; F, uropod.

FIG. 3. — Ischioscia herrerai López-Orozco, Carpio-Díaz & Campos-Filho n. sp., male paratype (CUDC-CRU 45):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.