A new species of belocaulus (gastropoda: veronicellidae)from southern and southeastern brazil

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THE NAUTILUS 123(2):34 42, 2009

Page 34

A new species of Belocaulus (Gastropoda: Veronicellidae) from southern and southeastern Brazil
Fernanda Pires Ohlweiler
´ Laboratorio de Malacologia ˜ Divisao de Programas Especiais ˆ Superintendencia de Controle de Endemias Rua Cardeal Arcoverde, 2878 ˜ 05408 003, Sao Paulo, BRAZIL fenandap@sucen.sp.gov.br

´ Dan Jesse Goncalves Mota ¸ SuzeteRodrigues Gomes
´ Laboratorio de Parasitologia, Instituto Butantan Rua Vital Brasil, 1500 ˜ 05503 900, Sao Paulo, BRAZIL dan_jesse@hotmail.com suzetebio@yahoo.com.br

A new species is proposed based on material collected in the ˜ states of Minas Gerais, Sao Paulo, Santa Catarina, and Rio Grande do Sul, Brazil. The morphology, radula, and jaw are described and illustrated. The new speciesis compared to Belocaulus angustipes, the only species of the genus currently considered valid. The main differences are found in the penis. The new species has small projections, similar to tubercles, on the anterior region of the glans, which can be scattered or arranged in two, three or more longitudinal rows. The terminal extremity of the glans has digitiform margin. The penis base is shortand poorly defined. The accessory gland is completely immersed in the tegument. The description of the new species extends the distribution range of Belocaulus for the states of ˜ Minas Gerais and Sao Paulo, Brazil. Additional keywords: Veronicellidae, Belocaulus, morphology, land slug

INTRODUCTION Veronicellidae includes terrestrial slugs of the subclass Gymnophila with pantropicaldistribution, with no shell, and no developed pulmonary cavity such as that observed in other terrestrial slugs of the subclass Pulmo nata. Some genera have been better studied because they include intermediate host species for the nematodes ´ Angiostrongylus costaricensis Moreira and Cespedes, 1971, and Angiostrongylus cantonensis (Chen, 1935), parasites responsible for abdominal angiostrongiliasis andeosinophilic meningoencephalitis, respectively. Among the veronicellid species cited as intermediate hosts for A. costaricensis are Sarasinula plebeia (Fisher, 1868) in Central and South America, Phyllocaulis variega tus (Semper, 1885), Phyllocaulis soleiformis (d’Orbigny, 1835), Sarasinula linguaeformis (Semper, 1885), and Belo caulus angustipes (Heynemann, 1885) in southern Brazil, and for A.cantonensis, Sarasinula marginata (Semper, ´ 1885) in the state of Espırito Santo, Brazil (Graeff Teixeira

et al., 1989; Graeff Teixeira et al., 1994; Rambo, 1997; Laitano et al., 2001; Caldeira et al., 2007). Veronicellid species have also been cited as damaging to agricultural ´ crops (Pereira and Goncalves, 1949; Araujo, 1952; Santos, ¸ ´, 1959; Thome 1993; Milanez and Chiaradia, 1999; Chiara diaet al., 2004; Robinson and Hollingsworth, 2004). When Hoffmann (1925) proposed Belocaulus, he in cluded in the genus South American species that pre sented the following characters: penis shaped as an asymmetrical arrow or irregularly widened, vas deferens opening terminally or subterminally, and presence of a small accessory gland behind the duct of the bursa copu latrix and rectum, partiallycovered by the tegument. That author included six species in the genus without, ´ however, designating a type species: B. langsdorfi (Fer ussac, 1822), B. boetzkesi (Miller, 1879), B. pterocaulis (Simroth, 1913), B. festae (Colosi, 1921), B. pulcher (Colosi, 1921) and B. sloanei (Cuvier, 1817). Baker (1925) designated Vaginulus angustipes as the type spe cies of Belocaulus and regarded the latter as asynonym of Angustipes Colosi, 1922. The synonymy proposed by Baker (1925) was not ac ´ cepted by Thome (1975), who revised the neotropical ´ species of Veronicellidae. According to Thome (1975), Belocaulus is valid and characterized by the presence of a small accessory gland between the rectum and the ´ female genital pore (which, according to Thome, is ab sent in Angustipes). He mentioned...