Poinar, George. Heydenius araneus n.sp. (Nematoda: Mermithidae), a parasite of a fossil spider, with an examination of helminths from extant spiders (Arachnida: Araneae). Invertebrate Biology. 2005, 119 (4): 388–93. JSTOR 3227190. doi:10.1111/j.1744-7410.2000.tb00108.x.
Poinar, George. Heydenius araneus n.sp. (Nematoda: Mermithidae), a parasite of a fossil spider, with an examination of helminths from extant spiders (Arachnida: Araneae). Invertebrate Biology. 2005, 119 (4): 388–93. JSTOR 3227190. doi:10.1111/j.1744-7410.2000.tb00108.x.