Pilumnus hirtellus (Linnaeus, 1761)

Garassino, Alessandro, Pasini, Giovanni, Angeli, Antonio De & Hyžný, MatÚš, 2014, The decapod fauna (Axiidea, Anomura, Brachyura) from the Late Pleistocene of Trumbacà, Reggio Calabria (Calabria, southern Italy), Natural History Sciences 1 (2), pp. 119-130 : 127

Pilumnus hirtellus (Linnaeus, 1761)

Fig. 3C, D

Material and measurements: One complete carapace (MSNM i27904 – lcpx: 6 mm; wcpx: 8 mm) and three right chelipeds (MSNM i27912, i27913 – hpa: 7 mm; ld: 5 mm; li: 3 mm; lpa: 9 mm; MSNM i27914 – ld: 7 mm; li: 5 mm).

Description: Subcircular carapace, wider than long, with anterolateral margins with four spines (excluding postorbital spine); smooth dorsal surface of the carapace with many pits.

Discussion. The above-mentioned characters are shared with the extant Pilumnus hirtellus (Linnaeus, 1761) , having anterolateral margins with four spines (excluding postorbital spine) and near smooth dorsal surface with many pits. This species was previously reported by Garassino et al. (2012), from the Zancle- an (Early Pliocene) of the “La Serra” quarry ( Pisa , Tuscany, central Italy). This is the first record of this species from the Pleistocene in Italy and in the southern Mediterranean basin. The extant P. hirtellus lives in northeastern Atlantic, Mediterranean and Black Sea.

Figures

Fig. 3 - A) Pisa armata (Latreille, 1803), MSNM i27880, right chela, outer and inner views (x 3.2). B) Atelecyclus undecimdentatus (Herbst, 1783), MSNM i27879, right chela, outer view (x 3.7). C) Pilumnus hirtellus (Linnaeus, 1761), MSNM i27904, carapace in dorsal view (x 8.5). D) Pilumnus hirtellus (Linnaeus, 1761), MSNM i27912, right chela, outer and inner views (x 7.5). E) Xantho cf. X. incisus (Leach, 1814), MSNM i27908, left chela, outer and inner views (x 4.6).