Leptaxinus minutus Verrill & Bush 1898

• Main Authors: Rodrigues, Clara F., Oliver, Graham, Cunha, Marina R.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Bivalvia; Lucinoida; Thyasiridae; Leptaxinus; Leptaxinus minutus; Iceland; Northwest Atlantic
• Online Access: https://doi.org/10.5281/zenodo.5657687; http://treatment.plazi.org/id/F6431C34F712E57CFF27F96C63EA8DCF

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. Published as part of Rodrigues, Clara F., Oliver, Graham & Cunha, Marina R., 2008, Thyasiroidea (Mollusca: ...