Species | Echinoderes aquilonius | Echinoderes capitatus | Echinoderes dujardinii | Echinoderes sp. E. dujardinii E. hispanicus E. horni E. spinifurca | Antygomonas sp. | Zelinkaderes floridensis | Pycnophyes dentatus | Pycnophyes flaveolatus | Pycnophyes kielensis |
---|---|---|---|---|---|---|---|---|---|
Data source | TEM | TEM | LM | CLSM | CLSM | TEM | TEM | TEM | TEM, CLSM |
Mouth cone | - | 3 circular muscles | - | 18 longitudinal, 2 circular muscles | 16 longitudinal, 8 short basal and 2 circular muscles | 18 longitudinal muscles | 2 circular cell basal to oos, 7 circular muscle cells basal to ios | - | 1 circular muscle cell basal to oos, 7 circular muscle cells basal to ios |
Introvert | 16 outer retractors 12 inner retractors | 10 retractors reaching S.6 | - | 10 retractors reaching S.6, Introvert circular muscle | 16 outer retractors reaching S.8 | - | 10 head retractors | - | 10 head retractors |
Neck | - | - | 1- 5 circular muscles | 1 circular muscle | 2 circular muscles: inner outer | - | - | - | - |
Trunk | - | - | Longitudinal: dorsal, ventral, and additional continuous fibers, Diagonal: 8 pairs Dorsoventral: S.3-11 | Longitudinal: Ventromedial + Dorsolateral and additional continuous fibers, Diagonal: 8 pairs Dorsoventral: S.3-11 | Longitudinal: Ventrolateral + Dorsolateral Diagonal: 9 pairs Dorsoventral: S.1-11 | - | - | - | - |
Spines | - | - | - | 3 pairs LTS + 1 pair TE muscles 1pair penile spines muscles | Midterminal spine muscles triangle- shaped | - | - | - | - |
Pharynx | Circular lumen | - | - | Circular lumen, 10 radial + 10 circular fibers | Circular lumen, 14–15 circular fibers alternate with inhomogeneous structures, pre- and postpharyngeal sphincters 10 protractors, Pharynx sheath present | Circular lumen, 15 radial +15 circular fibers,2 prepharyngeal 1postpharyngeal sphincters | Triradiate lumen | Triradiate lumen | Triradiate lumen |
13 radial + 14 circular muscle cell | Circular and radial muscular fibers | 13 radial + 14 circular muscle cell | |||||||
1postpharyngeal sphincter | 1postpharyngeal sphincter | 1postpharyngeal sphincter | |||||||
Midgut | 12-16 longitudinal muscles | - | - | Muscular grid: Inner longitudinal (16) + outer circular (+16) | Muscular Grid: Inner longitudinal + outer circular | Muscular Grid: Inner longitudinal + outer circular | Muscular Grid: inner longitudinal + outer circular | - | Muscular Grid: inner longitudinal + outer circular |
Hindgut | - | - | - | 1-2 pairs short dilator muscles | 1 dilator muscle | 6 dilators: 2 caudal + 2 dorsal 1 frontal 1 circular | 4 dilators: 2 caudal + 2dorsal; 2dorsal + 1 ventral transversal muscle cell | - | 4 dilators: 2 caudal + 2dorsal; 2dorsal + 1 ventral transversal muscle cell |
Reference | [1] | [33] | This study | [26] | [30] | [30] | [38] |