Coxal setae are paired setae situated on or near coxae.
coxal seta 1a: situated on
coxae I. In Astigmata present in all
active developmental stages. In
phoretic deutonymphs of Astigmata, can be modified to a conoid or be vestigial or absent.
coxal seta 3a: situated on
coxae III. In Astigmata present in all
active developmental stages. In
phoretic deutonymphs of Astigmata, can be modified to a conoid or be vestigial or absent.
coxal seta 4a: situated on
coxae IV. In Astigmata appear at the stage of deutonymph.
In
phoretic deutonymphs of Astigmata, can be modified to a conoid or be vestigial or absent.
coxal seta 4b: usually situated between setae 3a and anterior to setae 4a or occasionally absent.
In Astigmata appear at the stage of deutonymph.
genital seta g: Paired setae associated with the genital region.
In Astigmata appear at the protonymph stage.
external scapular seta: Paired prodorsal setae se in Astigmata (also known as sce;
in Oribatida known as ex).
external vertical seta: Paired prodorsal setae ve in Astigmata (in Oribatida known as le); sometimes absent.
internal scapular seta: Paired prodorsal setae si in Astigmata (also known as sce; in Oribatida known as in).
internal vertical seta: Paired prodorsal setae vi in Astigmata (in Oribatida known as ro).
supracoxal seta: Paired, often modified dorsal coxal seta (scx) in Astigmata associated
with the supracoxal gland opening. Situated on the lateral propodosoma (because
coxa are fused to the body
in Acariformes). Also known as elc I.
postanal seta: Unpaired median seta inserted posterior to the anal opening in the
Mesostigmata (Parasitiformes); usually on the anal or ventrianal shield.
In the Acariformes, in the ancestral complement of five setae surrounding the empodial claw ventrally, one is unpaired
and the most ventral (s), and four others are paired (u' and u'' and p' and p'').
Relative to each other, the unguinal setae u are more ventral and the proral setae p are more dorsal.
proral seta p or proral p: Paired disto-ventral setae (p' and p'') on tarsi I-IV of
Acariformes.
subunguinal seta s: Unpaired disto-ventral seta on tarsi I-IV of Acariformes.
unguinal seta u: Paired disto-venrtal setae u' and u'' on tarsi I-IV of Acariformes.
tarsal seta aa: On tarsus I in some Astigmata. Usually situated close to
solenidion ω2 in basal part of tarsus. Absent from tarsus II, hence can be easily identified by
comparison of tarsi I and II setations. Homologous to anterolateral setae a'' of Oribatida. (Not illustrated.)
tarsal seta ba: On tarsi I-II in many Astigmata. Usually situated in the
mid dorso-anterior part of tarsus Many Acaridae lack ba from tarsus I
in
phoretic deutonymphs,
while this seta is present in adults and other feeding stages (in contrast, setae ba II uniformly
present on tarsi II in all stages of these taxa). Homologous to fastigial setae ft' of Oribatida. (Not illustrated.)
tarsal seta e: Posterodistal seta on tarsi I-IV of Astigmata. On tarsi I-II
of
phoretic deutonymphs of Acaridae and related lineages (Astigmata), these setae have a
characteristic 'saucer' at the tip. Homologous to tectal seta tc'' of Oribatida.
tibial seta gT: Anterior seta on tibiae I-II of Astigmata. Homologous to seta v' of Oribatida.
(Not illustrated.)
tibial seta hT: Posterior seta on tibiae I-II of Astigmata. Homologous to seta c'' of Oribatida.
(Not illustrated.)
tibial seta kT: Anterior seta on tibiae III-IV of Astigmata. Homologous to seta v' of Oribatida.
Solenidia ω1, ω2, and ω3 are found on tarsi in many Acariformes.
solenidion ω1: In Astigmata, usually situated in
the dorso-basal part of tarsi I-II (absent from tarsi III-IV) and typically has a club-shaped, or rounded terminal end.
Invariably present in all developmental stages.
solenidion ω2: In Astigmata, usually situated in the basal, posterolateral
part of tarsus I (and absent from all other tarsi), often close to setae aa.
Often is much shorter than ω1 and has a rounded tip. Present in protonymphs to adults and absent in larvae.
solenidion ω3: In Astigmata, usually situated in the anterio-lateral part of tarsus
I (and absent from all other tarsi). In
phoretic deutonymphs usually situated in the basal part of tarsus
(sometimes close to ω1), while in adults and other feeding stages it is terminal. Present in
deutonymphs to adults and absent in larvae and protonymphs.
Suckers ad1+2 and ad3 and conoids ps1 and ps2 are paired suckers of setal origin located on the
attachment organ of
phoretic deutonymphs of Astigmata. Suckers function as attachment structures by creating negative pressure; they are
modified from setal alveoli, vestiges of which are visible in the center of the sucker. In contrast, conoids are attachment
elements that create adhesive forces; they are modified setae arising from well developed alveoli.
sucker ad1+2: Paired true suckers (from adanal setae ad1 and ad2 fused together) typically situated
centrally on the
attachment organ. Each sucker has two setal alveoli (often fused into a single alveolus).
sucker ad3: Paired true suckers (from adanal setae ad1 and ad2 fused together) typically situated
anteriorly on the
attachment organ. Each sucker has a setal alveolus.
conoid ps1: Paired conoids originating from pseudanal setae 1 (ps1) typically situated
posterolaterally on the
attachment organ. Lacks setal alveoli.
conoid ps2: Paired conoids originating from pseudanal setae 2 (ps2) typically situated
medio-laterally on the
attachment organ. Lacks setal alveoli.
tarsal sucker: In some genera of Astigmata, tarsal setae e (=tc'') and
d (=ft'') that are modified to suckers on tarsus IV of the male. Used for holding female
during copulation. Otherwise, these setae are filiform and not modified.