|p»>v4 



Fig. 45 — Supracaudal luminous glands of males of three forms of the Symbolophorus evermanni species group. 



A. Symbolophurus evermanni (sensu stricto) (Gilbert, 1905), 69.0 mm. 



B. Symbolophorus n. sp. ? (short-gland form), 62.0 mm. Although basically like those of S. evermanni, the structureof 

 the individual luminous scales differs notably. 



C. Symbolophorus n. sp. ? (re versed-concavity form), 67.3 mm. Note the reversed position of the concave borders of the 

 luminous scales, as compared to those of S. evermanni. 



Symbolophorus boops (?), "Southern" species group 



This category contains a group of poorly understood species found only in southern waters. 

 Within the southeastern Pacific there are at least three forms whose relationships are by no 

 means clear (Table 8). The principal differences known thus far are the structure and ar- 

 rangement of the caudal luminous glands. On this character the three forms may be separated 

 as follows (otherwise, in external appearance they are very similar to S. californiensis): 



1. Both supracaudal and infracaudal luminous glands present just before the first procur- 

 rent caudal rays. Each gland composed of two small, closely spaced, but distinctly separate 

 scales, beginning to form on specimens of about 40 mm. This form is known from off southern 

 Peru and northern Chile. It is tentatively regarded as a new species. 



2. Only a supracaudal gland present; this gland is large, with seven large plates nearly 

 filling the space between adipose base and caudal fin. Only a few specimens are known, one 

 from 44° S, 112° W, and two from Drake Passage near Cape Horn. These are also tentatively 

 regarded as undescribed. 



3. Andriashev (1962) reported on specimens taken from off Chile, to as far south as 55° S, 

 and identified them as Symbolophorus boops (Richardson, 1844). The supracaudal glands are 

 described and figured (Andriashev, 1962, p. 253, fig. 25) as small, separate, and located just 

 before the procurrent caudal rays; these glands are similar to those described above from off 

 Peru-Chile. 



51 



