Geodesic
Contribution towards the study of the phylogeny of the genus Proasellus. Observations at the scanning electron microscope of the copulatory pleopods of P. istrianus and P. ibeficus (Crustacea Isopoda)
Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 83 (1989) no. 1, pp. 313-318

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In 1972 Henry e Magniez formulated an hypothesis about the probable evolution of the extremity of the endopodite of male second pleopod (copulatory pleopod) in the species of Proasellus belonging to the meridianus line. In the scheme proposed by them, a rather easy structure, typical of some endemic species relicts of an ancient fauna of Proasellus, is the starting point. After an intermediate stage, they describe the structure present in P. meridianus, modern species, as the most functional. Referring to this evolutive scheme we realized a study by scanning electron microscope of this appendix in P. ibericus and P. istrianus. Our observations confirm the attribution of these two species, proposed by Henry e Magniez, respectively to the most primitive evolutive stage and to the intermediate stage. 
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     author = {Volpi, Emanuela Valeria and Antolini, Rachele and Valentino, Flora},
     title = {Contribution towards the study of the phylogeny of the genus {Proasellus.} {Observations} at the scanning electron microscope of the copulatory pleopods of {P.} istrianus and {P.} ibeficus {(Crustacea} {Isopoda)}},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali},
     pages = {313--318},
     publisher = {mathdoc},
     volume = {Ser. 8, 83},
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Volpi, Emanuela Valeria; Antolini, Rachele; Valentino, Flora. Contribution towards the study of the phylogeny of the genus Proasellus. Observations at the scanning electron microscope of the copulatory pleopods of P. istrianus and P. ibeficus (Crustacea Isopoda). Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 83 (1989) no. 1, pp. 313-318. http://geodesic.mathdoc.fr/item/RLINA_1989_8_83_1_a44/