NOVELTY - An isolated polypeptide having endoglucanase activity is new.    USE - The polypeptide is useful for degrading or converting or fermenting a cellulosic material, and for producing a fermentation product (all claimed), and for saccharifying the cellulosic material to fermentable sugars and to convert the fermentable sugars to useful fermentation products, e.g., fuel, potable ethanol, and/or platform chemicals (e.g., acids, alcohols, ketones, gases, and the like).    DETAILED DESCRIPTION - An isolated polypeptide having endoglucanase activity is selected from (a) a polypeptide having at least 70%, e.g., at least 75-99%, or 100% sequence identity to the mature polypeptide of SEQ ID NO: 2, a polypeptide having at least 75%, e.g., at least 78-99%, or 100% sequence identity to the mature polypeptide of SEQ ID NO: 4; or a polypeptide having at least 88%, e.g., at least 89-99%, or 100% sequence identity to the mature polypeptide of SEQ ID NO: 6; (b) a polypeptide encoded by a polynucleotide having at least 70%, e.g., at least 75-99%, or 100% sequence identity to the mature polypeptide coding sequence of SEQ ID NO: 1, a polypeptide encoded by a polynucleotide having at least 75%, e.g., at least 78-99%, or 100% sequence identity to the mature polypeptide coding sequence of SEQ ID NO: 3, or a polypeptide encoded by a polynucleotide having at least 88%, e.g., at least 89-99%, or 100% sequence identity to the mature polypeptide coding sequence of SEQ ID NO: 5; (c) a polypeptide encoded by a polynucleotide that hybridizes under medium stringency conditions, medium-high stringency conditions, high stringency conditions, or very high stringency conditions with (i) the mature polypeptide coding sequence of SEQ ID NO: 1, the mature polypeptide coding sequence of SEQ ID NO: 3, or the mature polypeptide coding sequence of SEQ ID NO: 5, (ii) the cDNA sequence of SEQ ID NO: 1, the cDNA sequence of SEQ ID NO: 3, or the cDNA sequence of SEQ ID NO: 5, or (iii) the full-length complement of (i) or (ii); (d) a variant of the mature polypeptide of SEQ ID NO: 2, a variant of the mature polypeptide of SEQ ID NO: 4, or a variant of the mature polypeptide of SEQ ID NO: 6, comprising a substitution, deletion, and/or insertion at one or more positions, where the variant has endoglucanase activity; and (e) a fragment of a polypeptide of (a), (b), (c) or (d) that has endoglucanase activity. All sequences are shown in Figures 1-3 in the specification. INDEPENDENT CLAIMS are:    (1) an isolated polynucleotide encoding the polypeptide above;    (2) a recombinant host cell comprising the polynucleotide of (1) operably linked to one or more control sequences that direct the production of the polypeptide having endoglucanase activity;    (3) a method of producing the polypeptide above;    (4) an isolated polynucleotide encoding a signal peptide comprising or consisting of amino acids 1 to 17 of SEQ ID NO: 2, amino acids 1 to 25 of SEQ ID NO: 4, or amino acids 1 to 20 of SEQ ID NO: 6;    (5) a method for degrading or converting a cellulosic material by treating the cellulosic material with an enzyme composition in the presence of the polypeptide having endoglucanase activity;    (6) a method for producing a fermentation product, by (a) saccharifying a cellulosic material with an enzyme composition in the presence of the polypeptide having endoglucanase activity, (b) fermenting the saccharified cellulosic material with one or more fermenting microorganisms to produce the fermentation product, and (c) recovering the fermentation product from the fermentation;    (7) a method of fermenting a cellulosic material by fermenting the cellulosic material with one or more fermenting microorganisms, where the cellulosic material is saccharified with an enzyme composition in the presence of the polypeptide having endoglucanase activity; and    (8) a whole broth formulation or cell culture composition comprising a polypeptide above.