Table 4. Described Steinernema species and their symbiotic bacterial species in the genus, Xenorhabdus.
| Steinernema Species |  Associated Xenorhabdus species | 
| Neosteinernema longicurvicauda | Undescribed | 
| Steinernema abbasi | Undescribed | 
| S. aciari | Undescribed | 
| S. affine | Xenorhabdus bovienii (Akhurst 1983) Akhurst and Boemare 1993 | 
| S. akhursti | Undescribed | 
| S. anatoliense | Undescribed | 
| S. apuliae | Undescribed | 
| S. arenarium | X. kozodoii Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| S. ashiuense | Undescribed | 
| S. asiaticum | Undescribed | 
| S. australe | X. magdalenensis Tailliez, Pages, Edgington, Tymo, and Buddie, 2012 | 
| S. backanense | Undescribed | 
| S. beddingi | Undescribed | 
| S. bicornutum | X. budapestensis Lengyel, Lang, Fodor, Szállás, Schumann, Stackebrandt, 2005 | 
| S. boemarei | Undescribed | 
| S. brazilense | Undescribed | 
| S. carpocapsae | X. nematophila (Poinar and Thomas 1965) Thomas and Poinar 1979 | 
| S. caudatum | Undescribed | 
| S. ceratophorum | Undescribed | 
| S. cholashanense | Undescribed | 
| S. colombiense | Undescribed | 
| S. costaricense | Undescribed | 
| S. cubanum | X. poinarii (Akhurst 1983) Akhurst and Boemare 1993 | 
| S. cumgarense | Undescribed | 
| S. diaprepesi | Undescribed | 
| S. eapokense | Undescribed | 
| S. ethiopiense | Undescribed | 
| S. feltiae | X. bovienii (Akhurst 1983) Akhurst and Boemare 1993 | 
| S. glaseri | X. poinarii (Akhurst 1983) Akhurst and Boemare 1993 | 
| S. guangdongense | Undescribed | 
| S. hebeiense | Undescribed | 
| S. hermaphroditum | X. griffiniae Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| S. ichnusae | Undescribed | 
| S. intermedium | X. bovienii (Akhurst 1983) Akhurst and Boemare 1993 | 
| S. jollieti | Undescribed | 
| S. karii | Undescribed | 
| S. khoisanae | Undescribed | 
| S. kraussei | X. bovienii (Akhurst 1983) Akhurst and Boemare 1993 | 
| S. kushidai | X. japonica Nishimura et al. 1995 | 
| S. leizhouense | Undescribed | 
| S. litorale | Undescribed | 
| S. loci | Undescribed | 
| S. longicaudum | Undescribed | 
| S. monticolum | Undescribed | 
| S. neocurtillis | Undescribed | 
| S. oregonense | Undescribed | 
| S. pakistanense | Undescribed | 
| S. phyllophagae | Undescribed | 
| S. puertoricense | X. romanii Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| S. puntauvense | Undescribed | 
| S. rarum | X. szentirmaii Lengyel, Lang, Fodor, Szállás, Schumann, Stackebrandt, 2005 | 
| S. riobrave | X. cabanillasii Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| S. ritteri | Xenorhabdus sp | 
| S. robustispiculum | Undescribed | 
| S. sangi | Undescribed | 
| S. sasonense | Undescribed | 
| S. scapterisci | X. innexi Lengyel, Lang, Fodor, Szállás, Schumann, Stackebrandt, 2005 | 
| S. scarabaei | X. koppenhoeferi Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| S. serratum | X. ehlersii Lengyel, Lang, Fodor, Szállás, Schumann, Stackebrandt, 2005 | 
| S. siamkayai | X. stockiae Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| S. sichuanense | X. bovienii (Akhurst 1983) Akhurst and Boemare 1993 | 
| S. silvaticum | Undescribed | 
| S. tami | Xenorhabdus sp | 
| S. texanum | Undescribed | 
| S. thanhi | Undescribed | 
| S. thermophilum | X. indica Somvanshi, Lang, Ganguly, Swiderski, Saxena, & Stackebrandt 2006 | 
| S. websteri | Undescribed | 
| S. weiseri | Undescribed | 
| S. xinbinense | Undescribed | 
| S. xueshanense | Undescribed | 
| S. yirgalemense | Undescribed | 
| Steinernema sp | X. doucetiae Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| Steinernema sp | X. hominickii Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| Steinernema sp | X. mauleonii Tailliez, Pagès, Ginibre & Boemare, 2006 | 
| Steinernema sp | X. miraniensis Tailliez, Pagès, Ginibre & Boemare, 2006 | 
 
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