Table 1 Comparison of selected biometrical data among ‘Diphyllobothrium’ sprakeri n. sp., ‘Diphyllobothrium’ scoticum and ‘Diphyllobothrium’ lobodoni. The incomplete description of D. scoticum from leopard seals from Macquarie Island, Antarctica, by Johnston [44] is not included. Measurements in micrometers, unless otherwise stated
Species | D. sprakeri n. sp. | D. sprakeri n. sp.1a | D. scoticumc | D. scoticumd |
|---|---|---|---|---|
Host | Zalophus californianus (Lesson) | Otaria flavescens Shaw | Hydrurga leptonyx (Blainville) | H. leptonyx |
Locality | California, USA | Los Lagos Region, Chile | Antarctica | Antarctica |
GenBank accession no | MW600337–MW600339 (lsrDNA); MW596661, MW596666–MW596673, MW596675–MW596678, MW596680 (cox1) | KY945917 (lsrDNA); KY945922, MF893274 (cox1) | – | – |
Reference | Present study | Rennie and Reid [42] | Fuhrmann [43]d | |
Strobila length (cm) | < 200 × 0.8 | > 50 | 13.3–29 | 13.3 |
Scolex | 999–1484 × 807–1275 | – | 1800–2500 × 1500 | 1800–3000 × 700–2500 |
Neck | Absent | – | Short | Absent |
Gravid proglottid (cm) | 0.03–0.07 × 0.27–0.79 | 0.08–0.14 × 0.71–0.74 | 0.09 × 0.15 | 0.12 × 0.55 |
Testes diameter or size | 44–70 | 150b | 69–87 | 100–160 |
Ovary width | 1029–1550 | – | – | – |
Number of uterine loops | 3–4 | 5–6 | > 4 | 5–7 |
Uterine sac-like structure | Present | Present | Present | Present |
Egg size | 59–75 × 40–47 | 54–61 × 39–44 | 70–100 × 43–51 | 64–80 × 44–48 |
Species | D. scoticum | D. scoticum | D. lobodoni | D. scoticum |
|---|---|---|---|---|
Host | H. leptonyx | H. leptonyx | Lobodon carcinophagus (Hombron & Jacquinot) | H. leptonyx |
Locality | Debenham Islands, Antarctica | Balleny Islands, D'Urville Sea, Antarctica | Balleny Islands, D'Urville Sea, Antarctica | King George Island, South Shetland Islands |
GenBank accession no | – | – | – | – |
Reference | Markowski [22] | Yurakhno and Maltsev [45] | Yurakhno and Maltsev [45] | Wojciechowska and Zdzitowiecki [46] |
Strobila length (cm) | 52–130 | 5.6–42 | 44.2–240 | 16–150 |
Scolex | 3500 × 2000 | 1900–3500 (length) | 1900–2870 (length) | 2200–4600 × 1100–2300 |
Neck length | 495 | 370–1500 | 910–1290 | Present |
Gravid proglottid (cm) | 0.50–0.80 × 1.50–1.80 | – | 0.35 × 1.35 | 0.16–0.8 × 0.13–0.6 |
Testes diameter or size | 150–210 × 150 | 69–193 | 100–220 | 67–150 × 47–1400 |
Ovary width | – | – | 4900 × 5100 | – |
Number of uterine loops | 5–12 | 5–17 | 7–22 | – |
Uterine sac-like structure | Present | Present | Present | Present |
Egg size | 76–79 × 56 | 68–76 × 50–53 | 71–74 × 51–53 | 60–85 × 42–56 |