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. 2018 Jun 18;6:e5021. doi: 10.7717/peerj.5021

Table 2. Comparison of the main diagnostic characters of T. debilis and T. thalassophila from different references.

Source Current conception Current conception Moniez (1890) (types) Denis (1923) (types) Willem (1925) Jordana et al. (1997) Fjellberg (1998) Bagnall (1937)
Cited as T. debilis T. thalassophila Lipura debilis Onychiurus debilis Onychiurus debilis Protaphorura debilis Thalassaphorura debilis Onychiurus thalassophilus
Current name T. debilis T. thalassophila T. debilis T. debilis T. debilis T. thalassophila T. thalassophila / debilis T. thalassophila
Length (mm) Female 1.4–2.1, male 1.4–1.65 Female 1.32–1.93, male 1.20–1.66 1.1–1.2 <1.5 0.95 1.5 1.4 1.5
PAO 13–21 16–23 23–28 19–20 17 18–19 15–20 16–20
Dorsal pso formula 32/1-233/3,3-4,3,4-6,3-4 32/133/33343 ?2/2??/????4 32/1≥2≥3/≥2≥2≥2≥23 32/133/33354 32/133/33343 32/133/33343 32/133/33343
Ventral pso formula 11/000/0111(2)0 11/000/00000 ? ? ? 11/000/00000 11/000/00000 11/000/00000
pso on subcoxae I-III 222 111 222 ? 111 111 111 111
Axial chaetae on Abd.VI m0 m0 (a0) ? ? ? m0 1 or 2 a0
Ratio of AS/clawIII 0.47–0.77 0.68–1.08 0.5–0.6 ≥0.5 0.6 0.7 Variable in size 0.62–0.86
Head ventral chaetae along groove 4+4 3+3 ? ? ? ? 4–5+4–5 3+3
Chaetae on ventral tube (anterior /distal /basal chaetae) 1+1/7+7(8)/2+2 1+1/7+7/2+2 ? ? ? 1+1/7–8+7–8/2+2 1+1(2)/7–8+7–8/1–4+1–4 1+1/7+7/2+2
Ratio of unguiculus/unguis 0.27–0.47 0.2 0.3–0.4 0.4 0.4 Short, ≤0.25 after original drawing Variable in size, mostly 0.5 Vestigial, reduced to a minute, stumpy process
Chaetae on subcoxae 1 of legs I-III 4–5, 4–5, 4–5 444 4/4–5/? ? ? 4/4/? ? 4(3)44
Location France: Pointe-aux-oies France: Pointe-aux-oies; Scotland: Dalmeny France: Pointe-aux-oies France: Pointe-aux-oies France: Pointe-aux-oies Spain: Pontevedra coast Norwegian and Danish coast Scotland: Dalmeny