Thyasiroidea (Mollusca: Bivalvia) from the mud volcanoes of the Gulf of Cadiz (NE Atlantic) Author Rodrigues, Clara F. Author Oliver, Graham Author Cunha, Marina R. text Zootaxa 2008 1752 41 56 journal article 49677 10.5281/zenodo.274249 b4d292b4-0c92-42c7-a47b-9a3577bd28be 1175-5326 274249 Leptaxinus minutus Verrill & Bush, 1898 (Fig. 30) Material examined . All from Gulf of Cadiz; two live-collected specimens, MSM01-03, stn 242 GKG13, Mercator mud volcano, 35º17.870'N , 06º38.810'W , 350 m , 6 May 2006 ( DBUA 00835.01); one live-collected specimen, TTR16, stn AT608Gr, Darwin mud volcano, 35º 23.531N , 07º 11.475W , 1115 m , 30 May 2006 ( DBUA 00836.01); two live-collected specimens, TTR16, stn AT604Gr, Yuma mud volcano, 35º 25.820N , 07º 06.330W , 1030 m , 29 May 2006 ( DBUA 00836.02). PLATE 4. Figures 24–25: Thyasira (Parathyasira) granulosa ( Monterosato, 1874 ) , Fig. 24 stn 321 GKG22, Meknès mud volcano, 732 m ( DBUA 00828.03), Fig. 25 stn 242 GKG13, Mercator mud volcano, 350 m ( DBUA 00828.02); Fig. 26 Thyasira obsoleta ( Verrill & Bush, 1898 ) stn 190 MUC8, Captain Arutyunov mud volcano, 1322 m , ( DBUA 00831.02); Fig. 27 Thyasira tortuosa ( Jeffreys, 1881 ) AT 622Gr, Porto mud volcano, 3902 m ( DBUA 00830.01); Fig. 28 Axinulus croulinensis ( Jeffreys, 1847 ) stn 242 GKG13, Mercator mud volcano, 350 m ( DBUA 00832.02); Fig. 29 Mendicula ferruginosa ( Forbes, 1844 ) stn AT575B, Mercator mud volcano, 355 m ( DBUA 000834.01); Fig. 30 Leptaxinus minutus Verrill & Bush, 1898 , stn AT608Gr, Darwin mud volcano, 1115 m ( DBUA 00836.01). Remarks. Leptaxinus minutus is rather tumid with a distinctly angular posterior outline but lacking a posterior sinus. The hinge is well developed with weak lateral folds and a tubercular cardinal. It was described from the northwest Atlantic and has been recorded from Norway and Iceland (Ockelmann in Oliver & Killeen 2002 ). The Gulf of Cadiz specimens agree well with the shell figured by Oliver and Killeen (2002, Pl.25 C, D) but comes from a much greater depth. Dufour (2005) did not examine this species but the Gulf of Cadiz specimens have a Type 2 gill with a single demibranch and according to similar forms described by this author, it will doubtfully be symbiotic.