The nematode genus Fergusobia (Nematoda: Neotylenchidae): molecular phylogeny, descriptions of clades and associated galls, host plants and Fergusonina fly larvae 2633 Davies, Kerrie A. Ye, Weimin Giblin-Davis, Robin M. Taylor, Gary S. Scheffer, Sonja Thomas, W. Kelley Zootaxa 2010 2010-10-01 2633 1 1 66 7RPB [238,353,410,436] Magnoliopsida Myrtaceae Syzygium Plantae Myrtales 40 41 Tracheophyta genus    Fergusobiavoucher specimens nos 470, 735; associated with an undescribed species of  Fergusonina( Figs 11, 33, 53). Clade 10 inFig. 78.  Form of gall. Usually one, but up to five locules, in pea-like galls developing on leaf blade, leaf mid-rib, leaf and flower buds, or stems ( Fig. 80). Similar to those described from  E. gomphocephala. The multilocular form on stems has a warty appearance and appears to develop in a leaf axis (leaf usually dehisced). Morphology of nematodes. Parthenogenetic female small; arcuate to open C-shape; medium oesophageal glands; short conoid tail. Infective female small; arcuate in shape; similar shape to parthenogenetic female but slimmer; small oesophageal glands; conoid tail. Male small; almost straight; oesophageal gland large; spicule arcuate, anterior part distinctly longer than posterior; tail conoid, tip bluntly rounded; bursa arises at ca50% of body length.  Morphology of dorsal shield.(WINC 063818). Shield comprising 2 or 3 transverse ‘bars’ and many spicules; similar to those from  Mel. cajuputi( Taylor 2004). ‘Bars’ comprise narrow patches of small spots of black chitin, running across body width.  Possible relationships. Clade 10 comprised  Fergusobiafrom  S. luehmanniiand  Met. excelsa. This clade, inferred from analyses of sequences of D2/D3, was weakly supported in this work (Fig. 78), but received 100% support in the analysis in Ye et al.(2007b). Analyses of sequences from COI gave no support for the grouping (Fig. 79). The nematodes from  S. luehmanniiwere morphologically similar to  F. nervosaefrom  M. nervosa(K.A. Davies, unpub. data). However,  F. pohutukawaDavies 2007was morphologically closest to  F. jambophilaSiddiqi 1986from flower bud galls on  S. cuminiin India( Taylor et al. 2007). Given the additional differences in gall and shield form and disparate host plant distributions ( Australiaand New Zealand), this seemed an unlikely grouping of  Fergusobia.  Metrosideroseae