SYSTEMATIC ACCOUNT : 93 



Genus Krohnia Quatrefages, 1865 

 Prostomium with five antennae. Five pairs of tentacular cirri. Parapodia with a cirriform appendage 

 on the pedal lobe and with simple chaetae only. 



Type species. Alciopa lepidota Krohn, 1845. 



Type locality. Messina, Mediterranean. 



Krohnia lepidota (Krohn), 1845 

 Alciopa lepidota Krohn, 1845, p. 175. 

 Krohnia lepidota Quatrefages, 1865, pp. 158-9. 

 Alciopa lepidota Langerhans, 1880, p. 312. 

 Callizonella lepidota Apstein, 1891, p. 133. 

 Callizonella lepidota Apstein, 1900, p. 12, pi. 11, figs. 11-13. 

 Callizonella lepidota Fauvel, 1916, p. 67. 

 Callizonella lepidota Fauvel, 1923, pp. 211-12, fig. -jge-h. 

 Callizonella lepidota Wesenburg-Lund, 1939, pp. 38-40, fig. 25, chart 19. 

 Krohnia lepidota Stop-Bowitz, 1948, p. 33. 



Description. All the specimens examined are fragments of which the longest is 50 mm. in length by 

 4 mm. wide across the tips of chaetae. Two pairs of small conical antennae are situated on the anterior 

 border of the prostomium in front of the eyes and an unpaired cirriform antenna occurs dorsally 



between the eyes. The five pairs of tentacular cirri are arranged thus : 1 + - + -, of which the posterior 



dorsal is very much longer than the others, all of which are subequal. Parapodia have foliaceous 

 dorsal cirri with an acuminate tip, small lanceolate ventral cirri, very long pedal lobes, each with a 

 conspicuous appendage, and prominent simple chaetae. These last are of two types: stout acicular 

 chaetae, more numerous anteriorly, and long fine chaetae which gradually replace the former 

 posteriorly. The whole body surface is sprinkled with black spots, which run in lines along the 

 antennae and tentacular cirri and are scattered over the eyes and prostomium; they are arranged in a 

 linear series at the dorsal edge of the parapodia and ventrally at the base of the feet and in the mid- 

 ventral line; the anterior surface of each pedal lobe has a single black spot in its centre. These spots 

 show clearly only in well-preserved specimens, but in all material they are present and even when 

 some have disappeared, an overall pattern similar to that described can be visualized. 



General distribution. K. lepidota is known from the Atlantic but not in large numbers; it is possible 

 that it has its southern limit of distribution at the Sub-Tropical Convergence (see p. 255). 



Genus Alciopa Audouin and Milne-Edwards, 1829 

 Body comparatively short and wide with a smaller number of segments than found elsewhere in the 

 family. Prostomium with five antennae. Three pairs of tentacular cirri. Proboscis with two long 

 cirriform appendages. Parapodia with foliaceous cirri; pedal lobe with two cirri and compound 

 chaetae; no rudimentary parapodia present. 



Type species. Alciopa reynaudii Audouin and Milne-Edwards, 1829. 



Type locality. The Atlantic Ocean. 



Alciopa reynaudii Audouin and Milne-Edwards, 1829 



Alciopa Reynaudii Audouin and Milne-Edwards, 1829, p. 202. 

 Alciopa Reynaudii Audouin and Milne-Edwards, 1833, p. 35. 

 Nauphanta celox Greeff, 1876, pp. 69-71, pi. 3, figs. 40-2, pi. 4, figs. 43-55. 

 Nauphanta celox Levinsen, 1882, p. 214, pi. 7, fig. 9. 



