Paratrichorhina piauiensis Bezerra-Pereira & Grangeiro & Lima 2023, n. sp.
Creators: name: Bezerra-Pereira, Carlos Anderson Soares
name: Grangeiro, Daniela Correia
name: Lima, Lucas Ramos Costa
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Platyarthridae
Paratrichorhina
Paratrichorhina piauiensis

description: Paratrichorhina piauiensis Bezerra-Pereira & Grangeiro n. sp.
(Figs 2–5)
Material examined. Holotype: Male (MNRJ 30462), Brazil, Piauí, Picos, Povoado Saquinho, moist soil with plant litter in closed forest, 7°7’33.26”S, 41°27’49.60”W, 03/IV/2022, leg. C. Bezerra-Pereira, J. Lopes & M. Viana. Paratypes: 2 males, 6 females (MZUSP 42752), 2 males, 6 females (MNRJ 30462), 1 male, 1 female (LABISO-UECE 0578), 6 males, 10 females (GETOPI-UESPI 0124), same data as holotype.
Etymology. The new species name is a reference to the Brazilian state where the specimens were collected, Piauí.
Diagnosis. Color dark brown, eyes of three dark ommatidia, second antenna with peduncle bearing feather-like scale-setae, antennal flagellum with second article about four times longer than first, outer endite of first maxilla with 4+5 teeth, four of them pectinated.
Description. Maximum body measures: male 2.8 mm long, 0.9 mm wide; female (ovigerous) 3 mm long, 1 mm wide. Color dark brown pigments on males, yellowish pigments on females. Habitus narrow (Fig. 2A). Dorsal surface bearing fan-shaped scale-setae (Fig. 2B). Cephalothorax (Fig. 2A, C) slightly involved by pereonite 1 epimera, anterior borders not reaching posterior margin of eyes, lateral lobes not well-developed; suprantennal line slightly downwards on middle; eyes of three dark ommatidia, arranged in triangle. Pereon with flagelliform noduli laterales, d/c coordinates with peak on epimera 3 and 5 (Fig. 2H); pereonites 1 and 7 with slightly conspicuous epimera (Fig. 2A). Pleon narrower than pereon, pleonites 1–5 epimera acute and directed backwards (Fig. 2A). Pleotelson (Fig. 2A) triangular with slightly rounded apex, lateral margins straight, distal portion not extending beyond uropod protopod.
First antenna (Fig. 2D), medial article shortest, basal and distal articles similar in length, distal article with four apical and two subapical aesthetascs.
Second antenna (Fig. 2E) short, distal article of peduncle stout bearing feather-like scale-setae; flagellum with second about four times longer than first; apical organ short.
Mandibles with molar penicil bearing up to seven branches; left mandible (Fig. 3A) with 2+2 penicils, right mandible (Fig. 3B) with 1+1 penicils.
First maxilla inner endite (not drawn) with two hairy penicils; outer endite (Fig. 3C) with 4 simple teeth + 5 teeth, four of them pectinated.
Second maxilla (Fig. 3D) inner and outer lobes rounded, without discernible separation; inner lobe with six thick setae, outer lobe with two thick setae.
Maxilliped (Fig. 3E) basis with some conspicuous setae and sulcus lateralis; palp with two setae on proximal article; endite subrectangular, medial seta surpassing distal portion in ventral view.
Pereopods (Fig. 4A–D) with strong and slender double-serrate setae; carpus I with ornamental setae (Fig. 4A, C); dactylus with two claws, outer claw being larger than inner claw, dactylar and ungual setae are simple and not exceeding beyond outer claw.
Uropod (Fig. 2G) protopod subrectangular, endopod inserted proximally, exopod longer than endopod.
Male. No apparent sexual dimorphism on pereopod I and VII (Fig. 4A–B) except for differences in size, number and topology of spine-like setae. Pleopod I exopod (Fig. 5A) ovoid and without setae; endopod (Fig. 5B) elongated with distal portion pointed outward, about three times longer than exopod. Pleopod II exopod (Fig. 5C) subtriangular with three simple setae on outer margin; endopod (Fig. 5D) longer than exopod and distal part flagelliform. Pleopod V exopod (Fig. 5E) triangular, with five simple setae on outer margin.
Ecological aspects. The specimens were collected in a hilly 106 m high area with full streams around the collection site (Fig. 1A–C). Decompacted soil was covered by a 10 cm layer of leaf litter. Collections took place during the rainy season, which increased the water level in streams surrounding the area, contributing to the maintenance of soil moisture and favoring the occurrence of oniscids. Anthropic activities are almost nonexistent and there are few residences nearby.
description: Published as part of Bezerra-Pereira, Carlos Anderson Soares, Grangeiro, Daniela Correia & Lima, Lucas Ramos Costa, 2023, A new genus and two new species of Platyarthridae Verhoeff, 1949 (Crustacea: Isopoda: Oniscidea) from Brazil, pp. 436-450 in Zootaxa 5325 (3) on pages 438-443, DOI: 10.11646/zootaxa.5325.3.8, http://zenodo.org/record/8243564