Thalassema
Key to the species of Thalassema from the Atlantic Ocean 1 Gonoducts two pairs. 2 - Gonoducts one pair. 3 2 Gonostome fan-shaped; papillae arranged in transverse series in middle region of trunk. T. philostracum - Gonostomal lips semicircular and frilled, papillae largest and most densely packed in...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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2009
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| Online Access: | https://zenodo.org/record/6225242 https://doi.org/10.5281/zenodo.6225242 |
| Summary: | Key to the species of Thalassema from the Atlantic Ocean 1 Gonoducts two pairs. 2 - Gonoducts one pair. 3 2 Gonostome fan-shaped; papillae arranged in transverse series in middle region of trunk. T. philostracum - Gonostomal lips semicircular and frilled, papillae largest and most densely packed in posterior region of trunk, not arranged in transverse series. T. thalassemum 3 Anal vesicles lacking; microscopic papillae located only in middle region of trunk. T. antarcticum - Anal vesicles present. 4 4 Gonostomal lips folded or crumpled; rectal caecum absent. T. elapsum - Gonostomal lips not folded or crumpled. 5 5 Interbasal muscle absent; gonostomes large; papillae more closely packed at anterior and posterior ends of trunk. T. arcassonense - Interbasal muscle present. 6 6 Integument thin and transparent; papillae small white specks scattered over trunk, more closely arranged at posterior end; rectal caecum absent. T. diaphanes - Integument opaque; papillae prominent, unequal in size, the larger ones scale-like and bent forwards; rectal caecum present. T. hartmani Published as part of Biseswar, Ramlall, 2009, The geographic distribution of echiurans in the Atlantic Ocean (Phylum Echiura), pp. 17-30 in Zootaxa 2222 on page 22, DOI:10.5281/zenodo.190138 |
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