Porcellionides lucasioides ( Vandel, 1953 )

Cifuentes, Julio & Da Silva, Luís P., 2024, Revision of the genus Porcellionides Miers, 1877 (Isopoda: Porcellionidae) in the Ibero-Balearic region, European Journal of Taxonomy 939, pp. 1-51 : 22

Porcellionides lucasioides ( Vandel, 1953)

Figs 2F, L , 3F , 14 , 15A–D , 16 , Table 1

Metoponorthus sexfasciatus lucasioides Vandel, 1953: 52 , fig. 2.

Material examined

SPAIN – Almeria • 8 ♂♂, 5 ♀♀; Nijar, Cabo de Gata; 15 Feb. 1984; A. Pollo leg.; cited by Cifuentes (2021a); MNCN 20.04/7164 . – Córdoba • 2 ♂♂; Venta del Charco ; 3 Apr. 1985; J. Cifuentes leg.; cited by Cifuentes (2021a); JC352 • 17 ♀♀; same collection data as for preceding; cited by Cifuentes (2021a); JC216. – Murcia • 4 ♀♀; Cabo Tiñoso ; 14 May 2022; I. Escarabajal Bernabé leg.; JC649 • 1 ♂; same collection data as for preceding; JC648 .

Remarks

Vandel (1953: 52) originally classified this taxon as a subspecies of P. sexfasciatus . He indicated distinctive characters, including pronounced granulations ( Fig. 14A ), few pores in the glandular fields, cephalon with a small median lobe, and medium-sized lateral lobes. In males, the carpus of the pereopods 1 and 2 possess dense setae, and the exopod I has a widened inner lobe at the base, terminating in a fine, narrow point ( Figs 14C , 15A ). The b/c and d/c coordinates are relatively low ( Figs 2F, L , 14B ). Additionally, it is noteworthy that the scale-setae possess a broad tip ( Fig. 3F ). The male exopod of the pleopod II is triangular ( Figs 14D , 15B ). Females exhibit a minor incision in the tracheal field on exopods I and II ( Fig. 15C–D ). Considering the aforementioned, we consider that P. lucasioides ( Vandel, 1953) possesses sufficient distinct characters to be considered a valid species ( Table 1 ), rather than a subspecies of P. sexfasciatus .

In some specimens of both immature and adult P. lucasioides , the inner tip of the exopod I is occasionally underdeveloped, which increases the potential for misidentification with P. glabe r. However, distinguishing between these two species is feasible, as P. lucasioides has pronounced granulations and medium-sized lateral lobes on the cephalon, while P. glabe r either presents a smooth body or, in some specimens, may have sparse and very fine granulations on the cephalon, and lacks lateral lobes.

Distribution

Spanish providences of Almería: Fondón, Laujar de Andarax ( Vandel 1953) and Níjar ( Cifuentes 2021a); Ávila: Piedralaves ( Pollo Zorita 1986b); Córdoba: Morrón Grande ( Garcia 2019) and Venta del Charco ( Cifuentes 2021a); Cuenca: Ruinas de Segóbriga ( Pollo Zorita 1986a, 2015); Jaén: Peñas ( Garcia 2019).

It is recorded for the first time in the Spanish province of Murcia ( Fig. 16 ).

Figures

Fig. 2. Relation between noduli laterales coordinates (following Vandel 1960) d/c (y-axis) and b/c (x-axis) multiplied by 100 for all studied species. A. Porcellionides cingendus (Kinahan, 1857). B. Porcellionides elegans(Pollo Zorita, 1982). C. Porcellionides fuscomarmoratus(Budde-Lund, 1885). D. Porcellionides glaber (Koch, 1856). E. Porcellionides hispanus (Vandel, 1953). F. Porcellionides lucasioides (Vandel, 1953). G. Porcellionides lusitanus (Vandel, 1946). H. Porcellionides molleri (Verhoeff, 1901). I. Porcellionides pruinosus (Brandt, 1833). J. Porcellionides sexfasciatus (BuddeLund, 1885). K. Porcellionides ibericus sp. nov. L. P. sexfasciatus and its previously considered subspecies: P. glaber (g), P. hispanus (h), P. lucasioides (l), P. lusitanus (lu), P. molleri (m) and P. sexfasciatus (s).

Fig. 3. Scale-setae. A. Porcellionides cingendus (Kinahan, 1857), ♂ (JC104). B. Porcellionides elegans (Pollo Zorita, 1982), ♂ (MNCN 20.04/7306). C. Porcellionides fuscomarmoratus (BuddeLund, 1885), ♀ (MNCN 20.04/8129). D. Porcellionides glaber (Koch, 1856), ♀ (MNCN 20.04/11490). E. Porcellionides hispanus (Vandel, 1953), ♂ (MNCN 20.04/7163). F. Porcellionides lucasioides (Vandel, 1953), ♂ (JC352). G. Porcellionides lusitanus (Vandel, 1946), ♂ (LPS661). H. Porcellionides molleri (Verhoeff, 1901), ♀ (LPS135). I. Porcellionides pruinosus (Brandt, 1833), ♀ (JC318). J. Porcellionides sexfasciatus (Budde-Lund, 1885), ♂ (LPS455a). Scale bar = 0.01 mm.

Fig. 14. Porcellionides lucasioides (Vandel, 1953), ♂ (JC648). A.Habitus. B. Noduli laterales coordinates. C. Exopod I. D. Exopod II. Scale bars: A = 1 mm; C–D = 0.1 mm.

Fig. 15. Pleopods. A–D. Porcellionides lucasioides (Vandel, 1953). A–B. ♂ (JC648). A. Exopod I. B. Exopod II. C–D. ♀ (JC216). C. exopod I. D. Exopod II. E–H. Porcellionides lusitanus (Vandel, 1946). E–F. ♂ (LPS661). E. Exopod I. F. Exopod II. G–H. ♀ (LPS644). G. Exopod I. H. Exopod II. I–L. Porcellionides molleri (Verhoeff, 1901), ♂ (JC237). I. Exopod I. J. Exopod II. K. Exopod I. L. Exopod II.M–P. Porcellionides pruinosus(Brandt, 1833). M–N. ♂ (JC383). M. Exopod I.N. Exopod II. O–P. ♀ (JC42). O. Exopod I. P. Exopod II. Q–T. Porcellionides sexfasciatus (Budde-Lund, 1885). Q–R. ♂ (LPS455a). Q. Exopod I. R. Exopod II. S–T. ♀ (JC75). S. Exopod I. T. Exopod II. Scale bars = 0.1 mm.

Fig. 16. Localization of the Ibero-Balearic region in Europe and the distribution of Porcellionides lucasioides (Vandel, 1953).