Fig. 3 in Functional morphology and modifications on spine growth in the productid brachiopod Heteralosia slocomi

Fig. 3. Tubular hollow spines developed on the surface of a ventral valve of productid brachiopod Heteralosia slocomi King, 1938; Moorman Ridge, White Pine County, Nevada, USA; middle Desmoinesian (Moscovian); UCMP 155651. A. SEM photograph. B. Enlargement showing detail of the arrangement of spines. Scale bars 1 mm.