Lilloiconcha inexpectata (Ihering, 1922)

CLASSE: GASTROPODA: TERRESTRE

FAMÍLIA: CYSTOPELTIDAE

ESPÉCIE: Lilloiconcha inexpectata (Ihering, 1922)

Tamanho médio: ~3 mm

Distribuição: Rio Grande do Sul até São Paulo

Localidade tipo: São Leopoldo, Rio Grande do Sul

Nome original: Amphidoxa inexpectata Ihering, 1922

Descrição:

(Salvador et al. 2025): “Shell minute (width ca. 3.5 mm, height ca. 2.8 mm), discoid, with ca. 5 whorls. Spire raised; spire top rounded. Whorls regularly increasing in size. Whorls with a lightly marked shoulder. Suture well-marked. Shell base colour whitish, marked by few irregular reddish brown axial blotches that fade out towards basal (abapical) region of whorl (13 in body whorl of holotype). Protoconch (1½ whorl) smooth (assessed from both apical and umbilical views), of base shell colour; transition to teleoconch clear. Teleoconch sculptured by multiple fine sinuous prosocline ribs, regularly spaced along whorls (ca. 80 on body whorl); space between ribs about four times rib width.

Aperture rounded, nearly D-shaped; aperture insertion on preceding whorl located close to the middle section of that whorl. Peristome simple. Umbilicus wide (~25% of shell width), deep, with early whorls visible. Details on the species’ anatomy, including radular morphology, can be found in vaz (1991, as Austrodiscus pleurophorus); no specimens with soft parts available could be obtained for the present study.”

Fotos: (1) Salvador et al. 2025: Lilloiconcha inexpectata (Ihering, 1922), HOLOTYPE MZSP 7634, diâmetro = 3.5 mm

Figura: Salvador et al. 2025: Lilloiconcha inexpectata (Ihering, 1922): (4–6) HOLOTYPE MZSP 7634; (7) detalhe da  protoconcha do HOLOTYPE; (8–11) espécime ilustrada em Pilsbry, 1900, ANSP 71244 (diâmetro – 3.1 mm)

Fontes:

Descrição original: Ihering, H. von. (1922). Die brasilianischen Amphidoxa-Arten. Archiv für Molluskenkunde. 54: 152-155., disponível online em https://www.biodiversitylibrary.org/page/35627086
página(s): 153

Salvador, Rodrigo & Miranda, Marcel & Santos, Fernanda & Oliveira, Cléo & Arruda, Janine & Cavallari, Daniel & Gomes, Suzete & La Pasta, Ariel & Pena, Meire & Ovando, Ximena & Rosa, Rafael & Salles, Anna Caroline & Santos, Sonia & Simone, Luiz & Marcondes Machado, Fabrizio. (2024). Checklist of the terrestrial gastropods of Brazil. Journal of Conchology. 45. 142-185

Salvador, R.B.; Silva, F.S.; Seizova, K.; Scarabino, F. (2025). Reassessment of the Brazilian species of Amphidoxa Albers, 1850 (Gastropoda: Stylommatophora: Punctoidea). Folia Malacologica 33  (1): 64–72

Molluscabase: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1448545