Trichorhina ornata, Cifuentes & Bernabé & Da Silva, 2025

Trichorhina ornata sp. nov.

https://zoobank.org/NomenclaturalActs/3802e36c-94d5-4418-ba3c-7892024c3a9d

Figs 6 View FIGURE 6 , 17 –21 View FIGURE 17 View FIGURE 18 View FIGURE 19 View FIGURE 20 View FIGURE 21

Material examined. Holotype: ( MNCN 20.04 About MNCN /20997 [ex. LPS862a]), Portugal, Faro, Tavira , 37°07’58” N, 7°39’13” W, 09/XII/2023, leg. L.P. Da Silva. GoogleMaps Paratypes: male ( LPS713 ), Portugal, Faro, Barranco do Velho , 37°13’56” N, 7°56’44” W GoogleMaps , 30/XII/2022, leg. L.P. Da Silva; female ( LPS849 ), same datum as preceding , 09/XII/2023, leg. L.P. Da Silva; male ( LPS850 ), male ( JC1044 [ex. LPS852a]), female ( LPS852 b), same data as preceding ; female ( LPS865 ), Faro, Castro Marim, Vista Real , 37°12’59” N 7°28’02” W GoogleMaps , 09/XII/2023, leg. L.P. Da Silva; female ( LPS858 ), Faro, Charneca , 37°10’50” N, 7°58’57” W GoogleMaps , 09/XII/2023, leg. L.P. Da Silva; male ( MNCN 20.04 About MNCN /20998 [ex. LPS859]), Faro, Charneca , 37°10’49” N, 7°58’56” W, same datum as preceding; female ( LPS708 ), Faro, Estói GoogleMaps , 37°04’57” N, 7°51’12” W, 29/XII/2022, leg. L.P. Da Silva; female ( LPS709 ), same datum as preceding ; 2 females ( JC995 ), Faro, Estòi, Cerro de Guilhim , 37°06’11” N, 7°55’46” W GoogleMaps , 24/IV/2024, leg. J. Cifuentes; female ( LPS717 ), Faro, Fonte da Benémola, 37°12’15” N, 8°00’13” W GoogleMaps , 30/12/2022, leg. L.P. Da Silva; male ( LPS720 b), Faro, Fonte da Benémola , 37°12’23” N, 8°00’16” W, same datum as preceding; female ( LPS724 ), Fonte da Benémola GoogleMaps , 37°12’32” N, 8°00’34” W, same datum as preceding; female ( LPS726 a), same datum as preceding; female ( LPS855 ), Faro, Fonte da Benémola GoogleMaps , 37°12’27” N, 8°00’27” W, 09/XII/2023, leg. L.P. Da Silva; male ( JC1045 [ex. LPS857a]), Faro, Fonte da Benémola, 37°12’23” N, 8°00’17” W, same datum as preceding GoogleMaps ; 2 females ( MNCN 20.04 About MNCN /20999 [ex. LPS857b]), same data as preceding GoogleMaps ; male ( LPS862 a) , 2 females ( MNCN 20.04 About MNCN /21000 [ex. LPS862b]), same data as holotype GoogleMaps .

Etymology. The specific name derives from the Latin ornatus, -a, -um, referring to the ornamented appearance created by the arrangement of the large scale-setae in longitudinal lines.

Diagnosis. Dorsal integument without granulations, with large fan-shaped scale-setae. Cephalon with large lateral lobes and triangular middle lobe with rounded tip. Posterior corners of all pereonites weakly sinuous, with small projections. Pleon continues pereon contour, with large neopleura. Telson large, longer than wide, with broadly rounded posterior edge.

Description. Maximum length: 3 mm in females, 2.8 mm in males. Lacking pigmentation and ocular apparatus ( Fig. 17A–C View FIGURE 17 ).

Integumentary characters ( Figs 17A–C View FIGURE 17 , 18A–D View FIGURE 18 ): Dorsal integument without granulations, with rounded scales and large fan-shaped scale-setae along longitudinal lines, intercalated with smaller ones. Numerous lines of scale-setae on cephalon, four on pereonite I, three on pereonites II to VII; one line on posterior margin. Noduli laterales very close to posterior margin, far from lateral margin.

Somatic characters ( Figs 17A–C View FIGURE 17 , 18C–D View FIGURE 18 ): Cephalon slightly inserted into anterior concavity of pereonite I; frontal line not distinct, vertex convex and continuous with frontal area; large trapezoidal lateral lobes oriented laterally, large triangular middle lobe with rounded tip. Pereonites posterior corner weakly sinuous, with small projections. Large sub-rectangular neopleura, continuing pereon contour; posterior corners of pleonite V longer than posterior edge of uropod protopods. Large telson, slightly longer than wide, sub-triangular, posterior margin broadly rounded extending beyond pleonite V corners.

Appendages ( Figs 19A–E View FIGURE 19 , 20A–C View FIGURE 20 ): Mandible with 1+1 free penicils; left mandible molar penicil dichotomised into two penicils; right mandible molar penicil dichotomised into three sub-equal branches. Maxillula inner endite with two penicils, outer endite with seven teeth. Maxilla and maxilliped as in Fig. 19D, E View FIGURE 19 . Antennula with three segments, second much shorter; third with six short aesthetascs. Short antennae, reaching posterior edge of pereonite II; flagellum with two segments, second three times longer than first, with small aesthetascs inserted halfway. Uropod protopods much shorter than telson tip; endopod almost same length as exopod, slightly protruding little from telson tip.

Sexual characters: Pereopods without sexual differentiation ( Fig. 20D View FIGURE 20 ). Male pleopod I ( Figs 17D View FIGURE 17 , 21A–B View FIGURE 21 ) with long and straight endopod with some teeth at tip; oval exopod, one and half times wider than long, rounded internal and external edges and few small teeth on posterior edge. Male pleopod II ( Figs 17E View FIGURE 17 , 27C–D View FIGURE 27 ) with endopod slightly longer than exopod, ending in thin tip; triangular exopod with long distal part, teeth on external edge and two long setae near tip. Male pleopod exopods III to V as in Fig. 21E–G View FIGURE 21 , female exopods as in Fig. 21H–L View FIGURE 21 .

Ecology. This species was found under rocks in limestone or adjacent areas during the day, within various habitats, ranging from more open grasslands to well-developed Mediterranean maquis and riparian galleries.