Citrus spine nematode

Criconema civellae

ORDER

Tylenchida

FAMILY

Criconematidae

TAXONOMY

Criconema civellae (Steiner, 1949), Greenhouse, Beltsville, Maryland, United States. Latest name: Crossonema civellae, Menta and Raski, 1971.

OTHER COMMON NAMES

None known.

PHYSICAL CHARACTERISTICS

Females are of length 0.0114-0.0339 in (0.29-0.86 mm), with 40-93 annules. Contains spear muscles that are well developed and large compared to other species. The muscles are 0.000591-0.00394 in (15-100 pm) in length. The labial cap is not easily distinguished from the overall body contour, except for a narrowing that leads to the oral disk. The esophagus is distinctive, the corpus is typical for the family, and the postcorpus is very distinctive. The isthmus and glandular regions merge into an almost cylindrical form that is slightly expanded at the end. This general region is narrower than the corpus, and equal to or shorter than the corpus in length as measured from the spear knobs. The external cuticle is ornamented with annulations. The annules are round—not lobed—and with a continuous edge of fine, blunt spines on most of the body. The spines are generally simple in shape, except in the posterior region where they are bifurcate, knobbed, or clubbed. The lip area is elevated (with the lip generally pointed), and the sub-median lobes are absent. The slylet is 0.00244-0.00453 in (0.06-0.12 mm) in length. The vulva is 3-16 annules from the terminus.

DISTRIBUTION

Not known. (Specific distribution map not available.)

HABITAT

Migratory.

FEEDING ECOLOGY AND DIET

As parasites, they live off the nutrients found on their hosts. BEHAVIOR

Plant parasites, specifically, ectoparasites, living on the outside of the plant host.

REPRODUCTIVE BIOLOGY

Males are degenerate and incapable of breeding.

CONSERVATION STATUS Not listed by the IUCN.

SIGNIFICANCE TO HUMANS None known. ♦

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

Get My Free Ebook


Post a comment