Character✝\\Literature | Vejdovský (1878) ‡ | Michaelsen (1900) ‡ | Nielsen & Christensen (1959) | Specimens from Liuba |
---|---|---|---|---|
Body length (mm) | 5 – 8 | 5 – 10 | 5 – 10 | 5 – 8 |
Segment number | 26 – 28 | 25 – 28 | 24 – 40 | 25 – 30 |
Chaetae per bundle | 2 – 3 | 2 – 4 | 2,3—2,3: 2,3—2,3 | 2 – 2,3: 3 – 3 |
Brain | Longer than wide, cut out at back | Longer than wide; post-end truncate | Longer than wide; post-end round | |
Dorsal blood vessel | Originating postclitellially | Originating in xii-xiii | Originating in XI | |
Chloragogen cells | Large, with large, bright oil droplets | With very prominent oil-globules | Covering intestine except in xii-xiii | |
Coelomocytes, or lymfocytes | Lymphatic body large, flat elliptical | Oval or pear-shaped; with rather few, coarse, refractile granules | With refractile granules, elliptic; 16.4 by 8.8 μm | |
Salivary glands, or peptonephridia, or esophageal appendages | Multiply sinuous ball | Flat, elongated, widened at the back, with multiple meandering canal | Cylindrical, with much interstitial tissue & a narrow, much coiled canal | Anterior part & two rear branches, coiled & hyaline; 145 μm long |
Spermathecae | With bentel-shaped ampulla, and narrow ectal duct with a glandular rim at the bottom | Varying, ectal duct short, with a dense layer of gland cells but without special glands round ectal orifice, rosette-like | Elliptic or spherical, ampulla 42 by 32 μm; ectal duct short, orifice covered with glandular tissues | |
Nephridia | With slender anteseptale, 2–3 times longer than wide, postseptale oval | Postseptale oval, with short, stout efferent duct arising posteroventrally | Spindle-shaped; one pair in each un-specialized segment, i.e. VII or XV | |
Seminal vesicles | Varying, thin tubes, or bottle-shaped sacs | Small, attached to x/xi and extending backwards into xi | Different shape; 122 by 102 μm, larger than ½ segment V | |
Sperm funnels | Calyx-shaped, trans-parent, without glands | Small, 2—3 times as long as thick | Small, pear-shaped or cylindrical with regular collar | Vase-shaped without base, 105 by 57 μm |
Vas deferens or sperm duct | Varying, short & thin, long & eyelashing-like | Sparsely twisted | Long, narrow, confined to xii | 3.2 – 3.5 μm in diameter |
Clitellum | Belt cells arranged in a ring | Over xii-xiii, glandular cells arranged in transverse rows | Over XII-XIII, saddle-like near the ventral nerve cord | |
Penial bulb, or male copulatory organ | Bursa propulsor large | Compact and rather small | Compact and elliptic, 81 by 79 μm, height less than 1/3 clitellar diameter |