A common parasite of bowfin is the anchor worm ("Lernaea"). An earthworm is a tubular, segmented worm of the phylum Annelida. The ulcers formed by the emerging worm may get infected by bacteria. A hookworm is a type of parasitic worm (helminth). The maned wolf is particularly susceptible to potentially fatal infection by the giant kidney worm. In January 2005, a mobile malware worm known as Lasco surfaced. The mode of infection by the Cayor Worm. This is characteristic of many types of worm infections. The bristle worm, a marine annelid, has been modified. Hemoglobin combines with hydrogen sulfide and transfers it to the bacteria living inside the worm. This made it spread much faster than any other previous email worm. Most diagnoses are made by identifying the appearance of the worm or eggs in feces. Almost all species of velvet worm reproduce sexually. Steering is by worm and wheel mechanism. Full extraction of the female guinea worm usually takes several days.