Fig 1.
Meiodorvillea minuta (Hartman, 1965), neotype (LACM-AHF Poly 12561).
(A) complete specimen, dorsal view; (B,C) anterior region, dorsal view; (D) parapodium 4, anterior view; (E) parapodium 12, anterior view; (F) capillary chaeta; (G) furcate chaeta; (H) compound chaetae. Dash lines represent broken chaeta. Abbreviations: an = antenna; dc = dorsal cirrus; pa = palp; vc = ventral cirrus. Scale bars: (A) = 0.5 mm; (B) = 80 μm; (C) = 50 μm; (D) = 20 μm; (E) = 40 μm; (F,G,H) = 12.5 μm.
Fig 2.
Meiodorvillea minuta (Hartman, 1965), ZUEC-POL.
(A) complete specimen, dorsal view; (B) anterior region, dorsal view; (C) parapodia from anterior region, dorsal view; (D) pygidium, ventral view. Abbreviations: an = antenna; dc = dorsal cirrus; dpc = dorsal pygidial cirrus; fc = furcate chaeta; pa = palp; vpc = ventral pygidial cirrus. Scales: (A) = 200 μm; (B,C) = 62.5 μm; (D) = 31.25 μm.
Fig 3.
Meiodorvillea minuta (Hartman, 1965), ZUEL-POL.
(A,B) anterior region, dorsal view; (C,D) pygidium, lateral view. Abbreviations: an = antenna; dpc = dorsal pygidial cirrus; pa = palp; vpc = ventral pygidial cirrus. Scales: (A) = 20 μm; (B) = 25 μm; (C) = 10 μm; (D) = 15.6 μm.
Fig 4.
Meiodorvillea minuta (Hartman, 1965), ZUEC-POL.
(A,B) parapodia from anterior region; (C,D) parapodia from posterior region; all anterior view. Abbreviations: dc = dorsal cirrus; vc = ventral cirrus. Scales: (A,B) = 10 μm; (C,D) = 15.6 μm.
Fig 5.
Meiodorvillea minuta (Hartman, 1965), ZUEC-POL.
(A) furcate chaeta from anterior region; (B) furcate chaeta from posterior region; (C,E) compound chaetae; (D) morphology of furcate chaeta, from chaetigers 2, 5, and 10; (F) cultriform chaeta. Scales: (A,B) = 5 μm; (C) = 10 μm; (D,E,F) = 6.25 μm.
Fig 6.
Meiodorvillea minuta (Hartman, 1965), ZUEC-POL.
(A) mandibles, dorsal view; (B) maxillae, dorsal view. Abbreviations: md = mandibles; mp = maxillary plates; mf = main fang; cls = carrier-like structure. Scales: (A,B) = 10 μm.
Table 1.
Main morphological differences and distribution of Meiodorvillea species.
Fig 7.
Meiodorvillea apalpata Jumars, 1974, LACM-AHF Poly.
(A) anterior region, dorsal view; (B) pygidium, dorsal view; (C) parapodium from posterior region, anterior view; (D) mandibles; (E) basal plates and maxillary carrier-like structures. Dash lines represent broken chaeta. Abbreviations: an = antenna; capc = capillary chaeta; chc = compound heterogomph chaeta; dpc = dorsal pygidial cirrus; gc = geniculate chaeta; vc = ventral cirrus; vpc = ventral pygidial cirrus. Scale bars: (A,B) = 50 μm; (C) = 20 μm. (D,E): modified from Jumars [17] (no scale bars in the original figures).
Fig 8.
(A) complete specimen, dorsal view; (B) anterior region, dorsal view; (C) parapodia from anterior region with furcate chaeta, dorsal view; (D) parapodium from posterior region with geniculate chaeta, dorsal view; (E) pygidial region, ventral view. Abbreviations: an = antenna; dpc = dorsal pygidial cirrus; fc = furcate chaeta; gc = geniculate chaeta; pa = palp; vpc = ventral pygidial cirrus. Scale bars: (A) = 200 μm; (B,D) = 100 μm; (C,E) = 50 μm.
Fig 9.
(A,C) anterior region, dorsal view; (B) anterior region, ventral view; (D) anterior region, ventrolateral view; (E,F) pygidium, ventral view. Abbreviations: an = antenna; dpc = dorsal pygidial cirrus; pa = palp; vpc = ventral pygidial cirrus. Scale bars: (A,B,E) = 25 μm; (C) = 50 μm; (D) = 20 μm; (F) = 10 μm.
Fig 10.
(A,B) parapodia from anterior region; (C,D) parapodia from posterior region; all anterior view. Abbreviations: fc = furcate chaeta; gc = geniculate chaeta; vc = ventral cirrus. Scale bars: (A,C) = 15.6 μm; (B,D) = 10 μm.
Fig 11.
(A) capillary chaeta, anterior region; (B,H) furcate chaeta; (C,D,I) geniculate chaeta;(E) compound chaetae, anterior region; (F) compound chaetae, median region; (G) compound and cultriform chaetae, posterior region; (J) compound chaetae; (K) chaetae, anterior region; (L) chaetae, posterior region. Abbreviations: cc = cultriform chaeta. Scale bars: (A-G) = 6.25 μm; (H-I) = 5 μm; (J) = 2 μm; (K-L) = 10 μm.
Fig 12.
(A) jaw apparatus; (B) mandibles; (C) maxillae; all dorsal view. Abbreviations: bs = basal plate; cls = carrier-like structure; mf = main fang; mp = maxillary plates. Scale bars: (A) = 20 μm; (B) = 10 μm; (C) = 6.25 μm.
Fig 13.
Meiodorvillea hartmanae sp. nov.
(A) complete specimen, dorsal view; (B) anterior region, dorsal view; (C) anterior region, ventral view; (D) parapodia with furcate chaeta; (E) pygidium, dorsal view. Abbreviations: an = antenna; dpc = dorsal pygidial cirrus; fc = furcate chaeta; pa = palp; vpc = ventral pygidial cirrus. Scale bars: (A,B) = 100 μm; (C) = 31.25 μm; (D,E) = 88 μm.
Fig 14.
Meiodorvillea hartmanae sp. nov.
(A) anterior region, ventrolateral view; (B) anterior region, ventral view; (C) anterior region, dorsal view; (D) pygidium, ventral view; (E) pygidium, lateral view. Abbreviations: an = antenna; dpc = dorsal pygidial cirrus; pa = palp; vpc = ventral pygidial cirrus. Scale bars: (A) = 40 μm; (B) = 25 μm; (C,E) = 31.25 μm; (D) = 20 μm.
Fig 15.
Meiodorvillea hartmanae sp. nov.
(A,B) parapodia from anterior region, (A) ventrolateral view, (B) anterior view; (C,D) parapodia from posterior region, (C) ventral view, (D) anterior view. Abbreviations: vc = ventral cirrus. Scale bars: (A) = 20 μm; (B,D) = 15.6 μm; (C) = 10 μm.
Fig 16.
Meiodorvillea hartmanae sp. nov.
(A,B) furcate chaeta, anterior region; (C,D) furcate chaeta, posterior region; (E,F,G) compound chaetae; (H) cultriform chaeta. Scale bars: (A,C,F) = 5 μm; (E) = 10 μm; (B,D,G,H) = 6.25 μm.
Fig 17.
Meiodorvillea hartmanae sp. nov.
(A) jaw apparatus; (B) maxillae; (C) maxillary plates; all dorsal view. Abbreviations: amp = anteriormost maxillary plates; bp = basal plate; cls = carrier-like structure; md = mandible; mf = main fang; mp = maxillary plates. Scale bars: (A,B) = 20 μm; (C) = 10 μm.
Fig 18.
Meiodorvillea jumarsi sp. nov.
(A) complete specimen, dorsal view; (B) anterior region, dorsal view; (C) parapodia with dorsal cirri and geniculate chaetae from anterior region, dorsal view; (D) pygidium, ventral view. Abbreviations: an = antenna; dc = dorsal cirrus; dpc = dorsal pygidial cirrus; gc = geniculate chaeta; md = mandible; mp = maxillary plates; pa = palp; vpc = ventral pygidial cirrus. Scale bars: (A) = 200 μm; (B) = 100 μm; (C,D) = 88 μm.
Fig 19.
Meiodorvillea jumarsi sp. nov.
(A) anterior region, dorsolateral view; (B) anterior region, dorsal view; (C,D) pygidium, ventral view. Abbreviations: an = antenna; dpc = dorsal pygidial cirrus; pa = palp; vpc = ventral pygidium cirrus. Scale bars: (A) = 50 μm; (B,D) = 25 μm; (C) = 10 μm.
Fig 20.
Meiodorvillea jumarsi sp. nov.
(A,B) parapodia from anterior region; (C,D) parapodia from posterior region; all anterior view. Abbreviations: dc = dorsal cirrus; vc = ventral cirrus. Scale bars: (A,C) = 10 μm; (B,D) = 15.6 μm.
Fig 21.
Meiodorvillea jumarsi sp. nov.
(A,F) geniculate chaeta; (B,G) furcate chaeta; (C,H) compound chaetae; (D) cultriform chaeta; (E) capillary chaeta. Scale bars: (A,B,D) = 5 μm; (C) = 10 μm; (E) = 12.5 μm; (F,G,H) = 6.25 μm.
Fig 22.
Meiodorvillea jumarsi sp. nov.
(A,B) jaw apparatus, dorsal view. Abbreviations: md = mandibles; mf = main fang; mp = maxillary plates; cls = carrier-like-structure. Scale bars: (A,B) = 20 μm.