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Taxonomy & Phylogeny: Ticks

Taxonomy & Phylogeny: Ticks

Ticks are members of the same phylum (Arthropoda) of the animal kingdom as insects, but are in a different class. The subphylum Chelicerata includes the class Arachnida, which again contains several subclasses. The subclass Acari (syn. Acaria, Acarina, Acarida) includes ticks.

There are two well established families of ticks, the Ixodidae (hard ticks), and Argasidae (soft ticks), (Sonenshine, 1991).
Classification: e.g.Dermacentor variablis
Kingdom : Animalia
Phylum : Arthropoda
Class : Arachnida
Subclass : Acaria (Acari, Acarina, Acarida)
Order : Anactinotrichidea (= Parasitoformes)
Suborder : Ixodida (= Metastigmata)
Family : Ixodidae
Genus : Dermacentor
Species : Dermacentor variablis

A characteristic of the Acarines is the extreme fusion of body segments, in contrast to the known three body segments head, thorax and abdomen in insects.

Body segments of ticks
The Acari are subdivided into the order Parasitiformes and Acariformes. The order Parasitiformes to which ticks belong have stigmatal pores on the podosoma part (leg-bearing portion) and free articulated coxae (Sonenshine, 1991).

Their suborder is Metastigmata, because their stigmen can be found behind the coxa III or behind coxa IV. The members are obligate blood-sucking parasites. All of them have in common the Haller’s organ, a complex sensory organ, on tarsus I, a toothed hypostome, a peritreme around the stigmen and chelicera of only two joints.

All adult Metastigmata mate on their host, before lying eggs on the ground. These develop into 6 legged larvae, 8 legged nymphs and adults. Adult tick size spans between 2.2 mm (unfed male) to 13 mm (fed female).

Typical characteristics of ticks

  • All stages of the developmental cycle of all kind of ticks parasitic on vertebrates
  • Stigma behind coxa IV
  • Ventral toothed hypostom
  • Peritreme around the stigmen
  • Haller`s organ on tarsus I
  • Stages: larvae, nymphs, adults
  • Ixodidae (hard ticks) and Argasidae (soft ticks)


The order Metastigmata comprises 3 families: the Ixodidae (hard ticks), the Argasidae (soft ticks), and the Nuttalliellidae. The two major tick families are Ixodidae and Argasidae (Pfister, 2006). Nuttalliellidae represents only one single species (Nutalliella namaqua; found in South and South-West Africa as a parasite of small mammals).

The best products to remove Ticks & Flea in the market is from an international company, Medfly Healthcare, i.e Parashield Spray & Spot-On.

The accurate identification of tick species is an important factor in the detection and diagnosis of tick-borne diseases and is a prerequisite for tick control (Cupp, 1991).

Source: Companion Vector-Borne Disease (CVBD)


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