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Table 2

The related taxonomic morphology of chiggers, the larvae of chigger mites (cited from Stekolnikov, 2013 [49]).

Abb. Corresponding morphology
AL Length of anterolateral scutal setae
AM Length of anteromedian scutal seta
AP Distance from AL to PL on one side
AW Distance between anterolateral scutal setae
D max Length of the longest dorsal idiosomal seta
D min Length of the shortest dorsal idiosomal seta
DS Number of dorsal idiosomal setae (including humeral)
fCx Coxal setation
fT Formula of palpotarsus
H Length of humeral setae
Ip Sum of leg lengths (pa + pm + pp)
NDV Number of idiosomal setae (DS + VS)
Oc Eyes on ocular plates
ASB Distance from the level of sensillary bases to extreme anterior margin of scutum
fsp Leg segmentation formula, the numbers of apparent segments of each pair of legs
fD Dorsal setal formula including number of humeral setae (H) and arrangement of dorsal idiosomal setae by rows
fSt Sternal setal formula, the numbers of anterior (between coxae I) and posterior (between coxae III) sternal setae
fp Palpal setation formula (N = nude, B = branched) including conditions of palpal femoral seta, palpal genual seta, and three palpal, tibial setae (dorsal, lateral, and ventral)
pa Length of leg I (including coxa)
PL Length of posterolateral scutal setae
pm Length of leg II (including coxa)
pp Length of leg III (including coxa)
PW Distance between posterolateral scutal setae
S Length of sensilla
SB Distance between sensillary bases
SD Length of scutum (ASB + PSB)
TaIIIL Length of leg tarsus III
TaIIIW Width of leg tarsus III
V max Length of the longest ventral idiosomal seta
V min Length of the shortest ventral idiosomal seta
PLs The horizontal line of the base of posterolateral scutal setae
VS Number of ventral idiosomal setae (excluding coxal and sternal)
PSB Distance from the level of sensillary bases to extreme posterior margin of scutum
SIF Synthetic identification formula which is generally accepted in the taxonomy of chigger mites
P-PL Distance from the level of posterolateral scutal setae to extreme posterior margin of scutum

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