Maghreboniscus rojasi, Garcia, 2022

Garcia, Lluc, 2022, Description of Maghreboniscus rojasi sp. nov. from Southern Spain and validation of the genus by the designation of a type species (Isopoda: Oniscidea: Spelaeoniscidae), Zootaxa 5190 (2), pp. 267-274 : 268-272

publication ID	https://doi.org/ 10.11646/zootaxa.5190.2.6
publication LSID	lsid:zoobank.org:pub:54857E62-CDD9-4C3E-9762-EC4CC4B59BE7
DOI	https://doi.org/10.5281/zenodo.7128890
persistent identifier	https://treatment.plazi.org/id/03927D5E-9C2A-4934-FF4A-FBAC4DDCC69B
treatment provided by	Plazi
scientific name	Maghreboniscus rojasi
status	sp. nov.

Treatment

Maghreboniscus rojasi View in CoL sp. nov.

Figs. 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4

http://zoobank.org/ urn:lsid:zoobank.org:act:F0FB8290-7B4E-49A4-903D-0139FB8DD57D

Spelaeoniscus sp. Garcia & Rojas, 2021, p. 48: fig. 2.

Material examined. Holotype: Male , SPAIN: Cádiz, Tarifa (36 01 18.4 N, 05 36 06.1 W), coastal grassland, 51 m a.s.l., 30 December 2021, leg. Daniel Rojas Pichardo (preserved in a vial with 70% ethanol; MBCN 24689 ). GoogleMaps

Paratypes. 3 females, same collection data as holotype, preserved each in vials with 70% ethanol ( MBCN 24690 , 24691 and 24692) GoogleMaps . 1 male, same collection data as holotype, dissected and mounted in 4 microscope slides ( MBCN 24693-1 , 24693-2 , 24693-3 and 24693-4). 1 additional female, same collection site and collector as precedent, 17 February 2021 (deposited in the author’s collection) GoogleMaps .

Diagnosis. The new species is characterized by the following unique combination of features: body covered with straight scale-setae and second pleopod of male with sub-triangular exopod.

Description. Maximum length observed: male, 1.5 mm; female, 1.7 mm. Exoantennal conglobation. Habitus and body outline as in figure 1 A–B. Body unpigmented; head and dorsum covered with erect straight scale-setae, laciniate apically ( Fig 2 A View FIGURE 2 ). Cephalon with well delimited antennal furrows, not deep, short, occupying about half of total head length; scutellum wide and smooth, with rounded inferior edge; eyes absent ( Fig. 2 B View FIGURE 2 ). Pereonite 1 with entire posterolateral corners, without schisma ( Fig. 2 C View FIGURE 2 ). Epimera of pereonites 2–4 with rounded margins, 5–7 straight. Epimera of pleonites 3–5 with straight margins. Noduli laterales situated far from lateral margin of pereon-tergites and close to its hind margin. Pleotelson dorsally convex, nearly semicircular, somewhat narrowed posteriorly ( Fig. 2 D View FIGURE 2 ).

First antenna of 2 articles; distal article with 3 short and thick aesthetascs, digitiform ( Fig. 2 F View FIGURE 2 ). Second antenna short, when extended backwards not reach to the posterior half of pereonite 1; fifth article swollen; flagellum bi-articulated, with proximal article three times shorter than distal; distal article with two aesthetascs ( Fig. 2 G View FIGURE 2 ). Mandibles with dichotomized molar penicil, bearing 6 setae each; right mandible with 1+1 free penicils ( Fig. 3 A View FIGURE 3 ); left mandible with 2+1 free penicils ( Fig. 3 B View FIGURE 3 ). Maxillula outer endite bearing 4+4 teeth and small additional tooth ( Fig. 3 C View FIGURE 3 ); inner endite with two sub-equal penicils inserted apically ( Fig. 3 D View FIGURE 3 ). Maxilla apically bilobed, inner lobe bigger than outer one, bearing 5–7 sensilla on outer margin and 3 on caudal face ( Fig. 3 E View FIGURE 3 ). Maxilliped: endite with straight inner margin, upper margin smooth and thick single seta on caudal face; palp with two large setae on basal article, articles 2–3 fused, with 2 long setae on inner margin and 1 equally long seta-like structure between them, 1+2 setae inserted distally and 3 short setae on outer margin ( Fig. 3 F View FIGURE 3 ).

Male. Pereopod 1 not modified, with brush of setae and plumose setae on propodus; propodus with 1 strong laciniate seta on ventral margin; dactylus with inner claw longer than outer one ( Fig. 4 A–B View FIGURE 4 ). Pereopod 7 not modified; propodus with 4 strong laciniate setae on ventral margin ( Fig. 4 C View FIGURE 4 ).

Pleopod 1 exopod small, sub-elliptical; endopod straight, apically pointed, with a sub apical lamella on caudal face ( Fig. 4 D View FIGURE 4 ). Pleopod 2, exopod sub-triangular, with wide basal half and narrow distal half; endopod sinuous, longer than exopod, with wide basal part and apical third narrow and slightly curved inwards ( Fig. 4 E View FIGURE 4 ).

Uropod not modified, with endopodite much larger than exopodite, dorsoventrally flattened and with denticulated inner margin ( Fig. 2 E View FIGURE 2 ).

Derivatio nominis. The new species is dedicated to its first collector, Daniel Rojas Pichardo, naturalist and student of the Andalusian biodiversity.

Remarks. M. rojasi sp. nov. is closely related to M. palmetensis , which also has a body covered with erect and straight scale-setae, and a wide cephalic scutellum. The first male pleopod is similar in both species. However, it is distinguished by the shape of the second male pleopod, which in M. rojasi has a large and sub-triangular exopod, while it is small and transversely oval in M. palmetensis . Both species also differ in the shape and size of the uropod endopodite. From M. trapezoidalis it is distinguished, among other features, by the elongated instead of flabelliform scale-setae and by the rounded instead of trapezoidal pleotelson (the male pleopods of M. trapezoidalis have never been illustrated, but Vandel (1959) indicated that there are no major differences with those of M. palmetensis ). Finally, M. rojasi sp. nov. differs from M. minimus by the straight as opposed to flabelliform scale setae, and by the shape of the pleotelson and the uropods.

The following key allows an easy separation of the four species hitherto included in the genus.