Styloniscus sp.

Aguiar, Ivanklin Soares Campos-Filho Giovanna Monticelli Cardoso José Otávio, 2018, Catalogue of terrestrial isopods (Crustacea, Isopoda, Oniscidea) from Brazil: an update with some considerations, Nauplius (e 2018038) 26, pp. 1-40 : 4-5

13. Styloniscus sp. (cf. S. otakensis sensu Vandel, 1952 nec Chilton, 1901)

Styloniscus otakensis – Lopes et al., 2005: 101, Tab.

1. – Zimmermann et al., 2015a: 3, Tab. 1.

Remarks. Chilton (1901) described Trichoniscus otakensis from South Island, New Zealand. The author mentioned that the buccal pieces, male pereopods and pleopods 1 and 2 were similar to T. phormianus [= Styloniscus p. ( Chilton, 1901)] and did not describe them. Vandel (1952b), based on material from Omaio, east coast of North Island, New Zealand, placed the species in the genus Styloniscus and provided the description and illustrations of the sexual characters of the male, i.e.,the pereopod 7 ischium distally enlarged, pleopod 1 exopod triangular and pleopod 2 endopod very long with tapering distal portion. Green (1971) revised Chilton’s type material and in the illustration of the male pereopod 7 ischium the enlargement figured by Vandel is not present, the male pleopod 1 exopod is concave on outer distal portion and the male pleopod 2 endopod is stout and slightly cleft at apex. However, Green considered Vandel’s specimens as a variation within the species.Comparing the descriptions provided by the authors, it is clear that the specimens examined by Vandel (1952b) correspond to a different species from that described by Chilton (1901). Recently, the same morphological characteristics described by Vandel (1952b) were observed in specimens collected from Brazil ( Lopes et al. 2005; Zimmermann et al. 2015a; present material). However, it is not certain that the Brazilian specimens are identical to those from New Zealand described by Vandel and a comparison with those specimens is necessary. Certainly, they do not belong to S. otakensis ( Chilton, 1901) .

Distribution. Recorded from the Parque Estadual do Monge, state of Paraná, and São Francisco de Paula, state of Rio Grande do Sul ( Zimmermann et al., 2015a). Specimens deposited at UFRGS were sampled from Parque Estadual do Monge, state of Paraná (1♂, 1♀, 3 juveniles, UFRGS 6544).