Paratrichorhina taitii 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 taitii

description: Paratrichorhina taitii Bezerra-Pereira & Grangeiro n. sp.
(Figs 6–9)
Material examined. Holotype: Male (MZUSP 42753), Brazil, Piauí, Picos, Povoado Aroeiras do Matadouro, Chácara dos trabalhadores: decompaction soil, 6°59’58.28”S, 41°28’23.47”W, 13/III/2022, leg. C. Bezerra-Pereira, J. Lopes & M. Viana. Paratypes: 3 males, 2 females (GETOPI-UESPI 0119), 1 male, 1 female (LABISO-UECE 0579), 2 males, 2 females (MNRJ 30463), 1 male, 1 female (MZUSP 42754), same data as holotype.
Etymology. The new species name honors Dr. Stefano Taiti for his invaluable contribution to the systematics of Oniscidea.
Diagnosis. Color Body with brownish, eyes of three dark ommatidia, second antenna with antennal flagellum with second article about 3 times longer than first, outer endite of first maxilla with 3+5 teeth, they are all pectinated.
Description. Maximum body measures: male 3.1 mm long, 1.8 mm wide; female (not ovigerous) 4 mm long, 2 mm wide. Color brownish pigments. Habitus narrow (Fig. 6A). Dorsal surface bearing fan-shaped scale-setae (Fig. 6B). Cephalothorax (Fig. 6A, D) 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. Pereonites 1–7 epimera with flagelliform noduli laterales, d/c coordinates with peak on epimera 2 and 5 (Fig. 6C). Pleon narrower than pereon, pleonites 1–2 epimera covered by the last pleon segment (Fig. 6A). Pleotelson (Fig. 6A) triangular with proximal part broader than distal part.
First antenna (Fig. 6E), basal article is larger than the others, medial is the smallest, and the distal is about 2.5 times larger than the medial and relatively equal to the basal, distal article with six aesthetascs in the subapical region, all robust.
Second antenna (Fig. 6F) short, distal article of peduncle stout bearing; flagellum with article second about three times longer than first; apical organ short.
Mandibles with molar penicil bearing up to four branches; left mandible (Fig. 7A) with 2+1 penicils, right mandible (Fig. 7B) with 1+1 penicils.
First maxilla inner endite (not drawn) with two hairy penicils; outer endite (Fig. 7C) with 3 simple teeth + 5 teeth, they are all pectinated.
Second maxilla (Fig. 7D) inner and outer lobes rounded, without discernible separation; inner lobe with five thick setae, outer lobe with one thick setae.
Maxilliped (Fig. 7E) basis with some conspicuous setae and sulcus lateralis; palp with two setae on proximal article; endite subrectangular, with a penicil in the median portion.
Pereopods (Fig. 8A–D) with strong, slender, simple and ornate setae; dactylus with two claws, outer claw being larger than inner claw, dactylar and ungual setae are simple and not exceeding beyond outer claw (Fig. 8A–D).
Uropod (Fig. 6G) protopod subrectangular, endopod inserted proximally, exopod twice as long as endopod.
Male. No apparent sexual dimorphism on pereopod VII (Fig. 8B) except for differences in size, number and topology of spine-like setae. Pereopod I carpus with longitudinal antennal grooming brush and ornamental setae (Fig. 8A). Pleopod I exopod (Fig. 9A) triangular two simple setae on outer margin; endopod (Fig. 9B) elongated, slightly longer than was exopod, with distal portion bent laterally. Pleopod II exopod (Fig. 9C) ovoid without setae; endopod (Fig. 9D) elongated, about twice longer than exopod, slightly thin half of the distal portion. Pleopod V exopod (Fig. 9E) triangular, outer margin convex with three simple setae.
Ecological aspects. The specimens were collected in an area impacted by human activity and cattle grazing (Fig. 1A–B, D). The decompacted soil and lack of moisture may have contributed to the low number of specimens collected at the site. The soil was covered by typical Caatinga vegetation with a large quantity of leaf litter, as well pebbles and fallen wood, sites where the animals were concentrated.
Remarks. Paratrichorhina taitii n. sp. differs from P. piauiensis n. sp. by the following: a) absence of subapical aesthetascs on the first antenna (vs. two subapical aesthetascs); b) absent of feather-like scale-setae in peduncle (vs. present); c) outer endite composed of 3 simple teeth + 5 teeth (all pectinated) (vs. 4+5, inner set with four teeth pectinated); d) molar penicil bearing up to three branches (vs. molar penicil with six branches).
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 443-448, DOI: 10.11646/zootaxa.5325.3.8, http://zenodo.org/record/8243564