Fig. 68 — Loweina interrupta, lectotype, male, 37.6 mm. 



Much of the confusion of the species L. rara and L. interrupta appears to stem from 

 Brauer's action in applying the name "rarus" to the specimen figured by Liitken (1892, fig. 4, 

 p. 246) and briefly described in a footnote as an anomalous form (see above). According to more 

 modern concepts of systematic procedure Brauer may have acted correctly, but to follow his 

 action at this date would only serve to compound the existing confusion. I therefore retain the 

 name "interruptum," applied by Taning (1928) to the species so figured by Liitken and de- 

 scribed in the footnote; the name "rara" is then retained for the species described (but not 

 figured) by Liitken in the body of the text. 



Since no definite type specimen hsa been designated for, and as only a brief key furnished 

 the original description of, L. interrupta , I hereby designate as lectotype o^ Loweina interrupta 

 (Fig. 68) specimen Number 18, a male (supracaudal gland present), 37.6 mm in standard 

 length, deposited in the Universitetets Zoologiske Museum, Copenhagen, Denmark. The 

 specimen is in good condition except for some slight damage to the mouth; the lower jaw is split 

 apart at the symphysis. The label bears the following data: "Myctophum interruptum Taning 

 iScopelus rarum (sic) Ltk.). 37°40' S.B. 12 L, 1864. Andrea." Also, I designate as paralec- 

 totype of Loweina interrupta specimen Number 225 of the same museum; the label bears this 

 information: "Myctophum interruptum Taning (Scopelus rarum (sic) Ltk.) 34°50' S.B. 4°30' 

 V.L., 1864. Andrea." 



The paralectotype is in poor condition. The forepart of the head is missing and only the gill 

 arches, remnants of opercular bones, and a portion of the cranium are left. The rest of the body 

 is relatively intact, except for slight damage to the caudal peduncle, but is quite soft and 

 flaccid; however, most photophores are legible, and a few scales and a large supracaudal gland 

 are retained. The length of the paralectotype, in its present condition, is about 33 mm, exclud- 

 ing the caudal fin; accurate standard length measurement is not possible. 



Body proportions for the lectotype only are given in Table 16. 



In the following counts, those for the lectotype are given first and are followed by those for 

 the paralectotype in parentheses, if different. D. 12 (damaged), A. 15 (damaged), pectoral 10-9 

 (10-10), pelvic 8 + 8; AO 6 + 8 (7 -H 8) gill rakers 34-1 + 10(4+1-^9, 3-H1 + 10). There are 

 about 8 very weakly developed lateral line pores that extend to about over the end of the 

 pectoral fin. 



Dentition: The dentition of L. interrupta is essentially like that of L. laurae and L. rara, 

 but the teeth appear to be much smaller, particularly the fangs on the palatines and vomer 

 heads. Also, the patch of teeth on the mesopterygoids is narrower than in the other two species. 



Photophores: The photophores of the head of L. interrupta are very similar to those of L. 

 laurae and L. rara. PVO, its diameter before a vertical from PLO and three diameters below it. 

 PVO2 below and touching bases of lower pectoral rays. A line through PLO and PVOi passes 

 well forward of PO^; a line through PLO and PVO.. passes a little before PO4. Five PO, 

 unevenly spaced and in a straight row which diverges but little from the ventral septum. POi 

 is close to the septum, and PO-, is but its diameter farther away and just before base of outer 

 pelvic ray. P0,.2 interspace a photophore diameter greater than those of PO2-:! and PO.i-j; the 

 interspace between PO2.4 is equal to that between PO4..-, and is two diameters greater than that 

 ofPO,... 



80 



