Trichorhina solorzanoi, Cifuentes & Bernabé & Da Silva, 2025

Cifuentes, Julio, Bernabé, Iván Escarabajal- & Da Silva, Luís P., 2025, The genus Trichorhina Budde-Lund, 1908 (Crustacea, Isopoda, Platyarthridae) in the Ibero-Balearic region, with descriptions of three new species, Zootaxa 5725 (3), pp. 341-370 : 356-359

Trichorhina solorzanoi sp. nov.

https://zoobank.org/NomenclaturalActs/8979ca6f-93ca-4f11-aa7c-bbbf82784703

Figs 6 , 18–21

Material examined. Holotype: Male ( MNCN 20.04 /21001), Spain, Almería, Cabo de Gata, 03/IV/2023, leg. Iván Escarabajal Bernabé. Paratypes: 4 females ( MNCN 20.04 /21002-5) , 2 females ( JC729 ), same data as holotype .

Etymology. The specific name refers to D. Héctor Solórzano Ariste, in appreciation for his friendship and assistance during the samplings conducted.

Diagnosis. Dorsal integument without granulations, with large fan-shaped scale-setae arranged in irregular lines. Pereonites I and II with posterior corners convex, straight in pereonite III, and pereonites IV to VII with small projections. Pleon continues pereon contour with large neopleura. Triangular telson, with straight sides and rounded tip.

Description. Maximum length: 3.8 mm in females, 2.5 mm in males. Lacking pigmentation and ocular apparatus ( Fig. 22A–C ).

Integumentary characters ( Figs 22A–C , 23A–D ): Dorsal integument without granulations, with triangular scales and fan-shaped scale-setae of different sizes in irregular lines, five or six on cephalon, four on pereonite I, three on pereonites II to VII, and two on pleonites; one line on posterior margin. Noduli laterales near posterior margin, further from lateral margin, especially on pereonite V ( Figs 6 , 23B ).

Somatic characters ( Figs 22A–C , 23C–D ): Cephalon inserted into pereonite I anterior concavity, lateral lobes continue pereon lateral margin; frontal line indistinct, vertex convex, merging with frontal area without separating line; large rectangular lateral lobes oriented laterally, large rounded middle lobe. Pereonites I and II with convex posterior corners, straight in pereonite III, with small angular projections on pereonites IV to VII. Large falciform neopleura continue pereon contour; posterior pleonite V corner shorter than posterior edge of uropod protopods. Triangular telson with straight sides and rounded tip, protruding beyond pleonite V corners.

Appendages ( Figs 24A–E , 25A–C ): Mandibles with 1+1 free penicils, molar penicil dichotomised into three branches of increasing size. Maxillula inner endite with two penicils, outer endite with seven teeth. Maxilla and maxilliped as in Fig. 24D, E . Antennula with three segments, second much shorter; third with six short aesthetascs. Short antennae, extending just beyond posterior edge of pereonite I; flagellum with two segments, second three times longer than first, with small aesthetasc group inserted approximately on last third. Uropod protopods much shorter than telson tip; endopod shorter than exopod, protruding little from telson tip.

Sexual characters: Pereopods without sexual differentiation ( Fig. 25D ). Male pleopod I ( Figs 22D , 26A–B ) with long curved endopod; subtrapezoidal exopod, wider than long with rounded internal and external sides. Male pleopod II ( Figs 22E , 26C–D ) with endopod longer than exopod, ending in thin tip; triangular exopod with long distal part with teeth on external edge and four long setae near the tip. Male pleopod exopods III to V as in Fig. 26E–G , female exopods as in Fig. 26H–L .

Ecology. This species has been found during the day, under rocks in an area of therophytes.

Figures

FIGURE 6. Relation between Noduli laterales coordinates d/c (y-axis) and b/c (x-axis) multiplied by 100 for all studied species. A, Trichorhina anophthalma Arcangeli, 1935, JC687; B, Trichorhina cascaisensis sp. nov., LPS917b; C, Trichorhina ornata sp. nov., LPS850; D, Trichorhina silvestrii Arcangeli, 1936, LPS129b; E, Trichorhina solorzanoi sp. nov., MNCN 20.04/21002-5.

FIGURE 18. Trichorhina ornata sp. nov., A, male paratype (LPS713); B, male paratype (LPS850); C–D, female paratype (LPS708): A, scale-setae; B, noduli laterales b/c and d/c ratios (y axis) and tergite number (x axis); C, cephalon and pereonite I; D, pleon, telson and uropods. Scale bars: A = 0.01 mm; C–D = 0.1 mm.

FIGURE 19. Trichorhina ornata sp. nov., A–E, female paratype (LPS855): A, left mandible; B, right mandible; C, maxillula; D, maxilla; E, maxilliped. Scale bars: A–E = 0.1 mm.

FIGURE 20. Trichorhina ornata sp. nov., A, female paratype (LPS717); B–D, male paratype (LPS850): A, antennula; B, antenna; C, uropod; D, pereopod VII. Scale bars: A–D = 0.1 mm.

FIGURE 21. Trichorhina ornata sp. nov., A–G, male paratype (LPS850); H–L, female paratype (MNCN 20.04/21000): A, endopod I; B, exopod I; C, endopod II; D, exopod II; E, exopod III; F, exopod IV; G, exopod V; H, exopod I; I, exopod II; J, exopod III; K, exopod IV; L, exopod V. Scale bars: A–L = 0.1 mm.

FIGURE 22. Trichorhina solorzanoi sp. nov., A–E, male holotype (MNCN 20.04/21001); F, female paratype (MNCN 20.04/21002-5): A, habitus; B, cephalon and pereonite I; C, pleon, telson and uropods; D, exopod I; E, exopod II; F, exopod I. Scale bars: A–B = 0.5 mm; C–F = 0.1 mm.

FIGURE 23. Trichorhina solorzanoi sp. nov., A–B, female paratype (MNCN 20.04/21002-5); C–D, male holotype (MNCN 20.04/21001):A, scale-setae; B, noduli laterales b/c and d/c ratios (y axis) and tergite number (x axis); C, cephalon and pereonite I; D, pleon, telson and uropods. Scale bars: A = 0.01 mm; C–D = 0.5 mm.

FIGURE 24. Trichorhina solorzanoi sp. nov., A–E, female paratype (MNCN 20.04/21002-5): A, left mandible; B, right mandible; C, maxillula; D, maxilla; E, maxilliped. Scale bars: A–E = 0.1 mm.

FIGURE 25. Trichorhina solorzanoi sp. nov., A, C, female paratype (MNCN 20.04/21002-5); B, D, male holotype (MNCN 20.04/21001): A, antennula; B, antenna; C, uropod; D, pereopod VII. Scale bars: A–D = 0.1 mm.

FIGURE 26. Trichorhina solorzanoi sp. nov., A–G, male holotype (MNCN 20.04/21001); H–L, female paratype (MNCN 20.04/21002-5): A, endopod I; B, exopod I; C, endopod II; D, exopod II; E, exopod III; F, exopod IV; G, exopod V; H, exopod I; I, exopod II; J: exopod III; K, exopod IV; L, exopod V. Scale bars: A–L: 0.1 mm.