Range extension of Mirinaba cadeadensis ( Morretes , 1952 ) ( Gastropoda : Pulmonata : Strophocheilidae ) along the coast of Paraná , southern Brazil

The Strophocheilidae Pilsbry, 1902, composed of the genera Strophocheilus Spix, 1872; Mirinaba Morretes, 1952; Speironepion Bequaert, 1948; Austroborus Parodiz, 1949; Chiliborus Pilsbry, 1926; Gonyostomus Beck, 1837 and Anthinus Albers, 1850, is exclusively from South America (Leme 1973). The genus Mirinaba Morretes, 1952, with 10 species, is restricted to the southeastern and southern Brazil (Simone 2006). In the last 40 years, a few works dealing with Mirinaba have been published (Leme 1973; Leme et al. 1979; Indrusiak 1985; Indrusiak and Leme 1985; Vieira and Simone 1990). Indrusiak and Leme (1985) conducted a comparative study of M. antoninensis (Morretes, 1952), M. cadeadensis (Morretes, 1952) and M. curitybana (Morretes, 1952), pointing out diagnostic shell and internal anatomy features. The type locality of Mirinaba cadeadensis (Figure 1) is Morro Cadeado, Morretes municipality, coast of Paraná state, Brazil (Morretes 1952; 1953). This species is also known in the adjacent mountainous areas of Estrada da Graciosa and Pico Marumbi (360-700 m above sea level), which extend 13 km from north to south (Indrusiak and Leme 1985; Simone 2006). At all these locations, the dominant vegetation is classified as Ombrophilous Dense Forest (Atlantic Rainforest) (Roderjan et al. 2002). The climate is humid subtropical, without a dry season, and with heavy rainfall and high air humidity (Maack 1981). The natural history of Mirinaba cadeadensis is still poorly understood. Indeed, it is a species difficult to find and observe due to its fossorial habits and preference for humid areas in forest (Morretes 1952; Indrusiak and Leme 1985). Mirinaba cadeadensis has a dark brown margin of the foot, sometimes almost olive, gradually changing to gray on the dorsal surface; its tentacles are light gray (Figure 1A) (Indrusiak and Leme 1985). Indrusiak and Leme (1985) found some variation in peristome thickness and color of Mirinaba cadeadensis collected at Morro Cadeado and Estrada da Graciosa. The peristome, in both localities, varied from narrow and delicate to thick and its color varied from milky white to Abstract: Mirinaba cadeadensis (Morretes, 1952), a strophocheilid land snail, is known from Morro Cadeado, Estrada da Graciosa and Pico Marumbi, all located in the Atlantic Rainforest biome along the coast of Paraná state, Brazil. Based on material from the collection of the Museu de História Natural Capão da Imbuia (Curitiba, Brazil) and newly collected specimens, we report the occurrence of this species in 11 new localities in this region. 1 Universidade Federal do Paraná, Setor Litoral. Rua Jaguariaíva, 512, Caiobá. CEP 83260-000. Matinhos, PR, Brazil. 2 Laboratório Móvel de Educação Científica da UFPR Litoral. Rua Jaguariaíva, 512, Caiobá. CEP 83260-000. Matinhos, PR, Brazil. * Corresponding author. E-mail: carlosbirc@gmail.com Carlos João Birckolz 1*, Marcos de Vasconcellos Gernet 1 and Antonio Luis Serbena 1,2 Range extension of Mirinaba cadeadensis (Morretes, 1952) (Gastropoda: Pulmonata: Strophocheilidae) along the coast of Paraná, southern Brazil

The type locality of Mirinaba cadeadensis (Figure 1) is Morro Cadeado, Morretes municipality, coast of Paraná state, Brazil (Morretes 1952;1953).This species is also known in the adjacent mountainous areas of Estrada da Graciosa and Pico Marumbi (360-700 m above sea level), which extend 13 km from north to south (Indrusiak and Leme 1985;Simone 2006).At all these locations, the dominant vegetation is classified as Ombrophilous Dense Forest (Atlantic Rainforest) (Roderjan et al. 2002).The climate is humid subtropical, without a dry season, and with heavy rainfall and high air humidity (Maack 1981).
The natural history of Mirinaba cadeadensis is still poorly understood.Indeed, it is a species difficult to find and observe due to its fossorial habits and preference for humid areas in forest (Morretes 1952;Indrusiak and Leme 1985).Mirinaba cadeadensis has a dark brown margin of the foot, sometimes almost olive, gradually changing to gray on the dorsal surface; its tentacles are light gray (Figure 1A) (Indrusiak and Leme 1985).Indrusiak and Leme (1985) found some variation in peristome thickness and color of Mirinaba cadeadensis collected at Morro Cadeado and Estrada da Graciosa.The peristome, in both localities, varied from narrow and delicate to thick and its color varied from milky white to Abstract: Mirinaba cadeadensis (Morretes, 1952), a strophocheilid land snail, is known from Morro Cadeado, Estrada da Graciosa and Pico Marumbi, all located in the Atlantic Rainforest biome along the coast of Paraná state, Brazil.Based on material from the collection of the Museu de História Natural Capão da Imbuia (Curitiba, Brazil) and newly collected specimens, we report the occurrence of this species in 11 new localities in this region.
This study records 11 new occurrences of Mirinaba cadeadensis in the Serra do Mar, along the coast of Paraná state, expanding the known distribution.The material studied is composed of 30 empty shells and one live specimen, collected between 1946 and 2013, deposited at Museu de História Natural Capão da Imbuia (MHNCI), Curitiba, Paraná, Brazil: MHNCI 670, 1 shell, Santa Cruz, Serra da Prata, Paranaguá, A. Mayer col., VI.1946   Nine new localities in the region of Serra da Prata (municipalities of Morretes, Paranaguá, Matinhos and Guaratuba), Cubatão (municipality of Guaratuba) and Guaricana (covering Guaratuba and São José dos Pinhais municipalities) extend the known distribution of Mirinaba cadeadensis 46 km to the south from Pico Marumbi, the formerly southernmost known locality (Figure 2).The extension of the known distribution for this species is now 59 km from north to south and the known altitudinal range is 30-700 m a.s.l.At the Morro Itaguá site, the species was living at 30 m a.s.l. and only 400 m from the shoreline.This is the lowest altitude recorded for the species.
Among the shells studied, differences were observed in the peristome, as previously noted by Indrusiak and Leme (1985).The single specimen from Guaricana, for instance, has a thick, white peristome, while the shells from Serra da Prata (n=26) and from Cubatão (n=4) have peristomes varying from narrow to thick and from white to light pink or red.
The localities recorded here for Mirinaba cadeadensis, are natural protected areas (Pico do Marumbi State Park, Saint-Hilaire/Lange National Park, Serra do Mar and Guaratuba Environmental Protection Areas) and all neighboring areas are still preserved, however constantly threatened by construction projects of roads and railways.To help the conservational efforts of M. cadeadensis, a better knowledge of its taxonomy, morphological variation, distribution and ecology is required.