SYSTEMATIC REPORT 131 



Euchaetomera glyphidophthalmica Illig, 1906 



1906a Euchaetomera glyphidophthalmica Illig, pp. 201-2, text-fig. 9. 



1914 Euchaetomera glyphidophthalmica, Zimmer, p. 394, pi. XXiv, fig. 25. 



19156 Euchaetomera glyphidophthalmica, Zimmer, p. 318. (Doubtfully.) 



1929 Euchaetomera glyphidophthalmica, Colosi, p. 417. 



1930 Euchaetomera glyphidophthalmica, Illig, pp. 445-6, text-figs. 84-7. 

 1939 Euchaetomera glyphidophthalmica, Tattersall, p. 243. 



Occurrence : 

 St. 266. 21. vii. 27 (night). West of Orange River estuary, 20o(-o) m., 1 S, 8-5 mm., 1 ?, 8-5 mm., 3 small juv., 



3-4-2 mm. 

 St. 276. 5. viii. 27 (night). South of Cape Lopez, i5o(-o) m., 1 $, 8-8 mm. 

 St. 695. 11. v. 31 (night). Mid-Atlantic, north of equator, 370-0 m., 1 <J, 1 ?, 8 mm. 

 St. 701. 16. x. 31 (night). Near Cape Verde Is., 242-0 m., 2 ??, 7 mm., both imm. 



Remarks. This species is characterized by the very large lateral areas of ocelli in the eyes and by the 

 small area of colourless facets between this area and the terminal area of ocelli. In large animals the 

 two areas are only separated from each other by a depression. I have found it extremely difficult to 

 decide whether to refer some of the specimens from the Discovery material to E. glyphidophthalmica, 

 to E. oculata, or to E. intermedia, for so many of the specific characters have no set boundaries, and 

 individuals may show certain characters of one species and at the same time characters of the 

 others. Even those characters which they do show are often intermediate between those given by the 

 authors for the identification of the species. Unless numbers of new species are to be founded, 

 considerable latitude must be allowed in the characters which are accepted for the existing species. 

 This I have done and I have referred to E. glyphidophthalmica those specimens in which (1) the lateral 

 areas of ocelli in the eyes are very much larger than the terminal ones and are separated from the 

 terminal areas by a very narrow colourless area ; (2) in which the rostrum is small and acutely pointed 

 and (3) in which the lateral margins of the telson are unarmed, the posterior margin truncate, armed 

 at its outer angles with a small spine on each side and with two long median plumose setae. The one 

 really outstanding character lies in the nature of the eyes, but I have found it difficult to decide in some 

 cases whether the characters I have mentioned are definite enough to admit the individual to this or 

 to that species, so much do they grade one into another. 



Distribution. This species was first described from off the Canary Isles. It has since been re- 

 corded again from the same area, from the Gulf of Guinea and from west of Angra Pequena (Illig, 

 1930), and from the Gulf of Aden (Tattersall, 1939). Zimmer (19156) and Colosi (1929) doubtfully 

 referred specimens from the Gulf of Naples to this species, but I think that these specimens were in 

 all probability E. intermedia. W. M. Tattersall (1943) recorded one immature male from east of the 

 Windward Isles taken at 50 m. 



All the specimens in the Discovery collection were taken in the South Atlantic, two off the west 

 coast of South Africa and the other two in mid-Atlantic a little north of the equator. 



This species does not appear to inhabit such deep waters as E. tenuis and E. typica. There are no 

 records from closing nets but, except in one case, all the known specimens have been taken in vertical 

 or oblique hauls from comparatively shallow depths. 



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