Chtenopteryx sepioloides

A Ctenopteryx ...

• with visceral and ocular photophores.
• with arm suckers in up to 4 series.

Squid were taken from the stomach of lancetfish captured at the following localities: 27°07'N, 178°16'W; 19°30'S, 133°15'W and 18°02'S, 136°17'W.

1. Arms
   • Arms subequal with arms IV slightly the longest.
   • Arms I-III with suckers in up to 4 series and about 50 transverse rows.
   • Arms IV with suckers in 2 series.
   • Sucker dentition unknown.
2. Mantle
   • Mantle width 63-77% of ML.
3. Photophores
   • Oval photophore on viscera small, 2.5 by 1.75 mm in a 19 mm ML squid.
   • Large, ventral photogenetic patch on each eye; in small squid each patch consists of 5 lobes.
     
     
     
     Figure. Ventral view of mantle-cavity viscera showing the small size of the visceral photophore, syntype, female, 19 mm ML. Drawing modified from Rancurel, 1970.
     
     
4. Tentacular club
   • Number of transverse suckers unknown.
5. Fins
   • Longest fin ribs are 34% of the ML.
6. Radula
   • Only 5 teeth present in transverse row
     
     Figure. Drawing of radular teeth of C. sepioloides, 14 mm ML, from Rancurel, 1970.[/caption]
7.  Gladius
   • Gladius rhachis with triangular cross-section.
     
     
     
     Figure. Drawing of gladius of C. sepioloides, 14 mm ML, from Rancurel, 1970.
     
     
     

   Measurements

   ML, mm	15	15	18	19
   MW, % ML	66.5	77	72.5	63
   Fin L, % ML	73	86.5	72	79
   Head W, % ML	46.5	53.5	50	50
   Arm I, % ML	40	50	ca. 50	42
   Arm II, % ML	40	60	ca. 55	47.5
   Arm III, % ML	46.5	60	ca. 55	45
   Arm IV, % ML	60	70	ca. 55	45.5
   Club L, % ML	33.5	33.4	33.4	51.6

   Table from modified from Rancurel, 1970.

Comments

The 5-tooth radula is probably a feature of all members of the genus as we have seen the same type in a different species from Hawaiian waters. Accessory nidamental glands could not be detected in the immature females.

• Chubby combfin squid