T. maculata is one of three similar species in the genus. The largest known specimen is an immature male of 143 mm ML. This is a small meso- to bathypelagic squid that is found in the tropical Eastern Atlantic. A detailed account of this species is given by N. Voss (1985).
- Arms I and II of males with 3-4 series of suckers on modified tips.
- Arms I and II of males with 25-27 normal suckers proximal to modified ends.
- Largest arm III suckers 3 times basal suckers in diameter (at least 3.2% of GL in diameter).
- Single-point tubercle, poorly developed, at each funnel-mantle fusion.
- Largest club suckers with 22-26 teeth.
The extent of the modifications to the arms of mature males is unknown. Additional details of the description of T. maculata can be found here.
Data from opening-closing nets on the vertical distribution of this species have been reported at 11° N, 20° W (Lu and Clarke, 1975). Paralarvae up to about 20 mm ML were captured mostly in the upper 100 m during both the day and the night. By about 40 - 50 mm ML three of the four squid captured were taken between 500 - 700 m day and night; the fourth had apparently wandered upward at night and was taken at 300 - 400 m. The sparse data suggest that these squid undergo ontogenetic descent without diel vertical migration. Vertical distribution chart modified from Lu and Clarke, 1975.
T. maculata is known only from the tropical Eastern Atlantic in oceanic waters whose depth exceeds 1000 m. At the northern end of its range, it appears to be confined to the oceanographically distinct region of the Mauritanian Upwelling (Voss, 1985). For a comparison with the distribution of the other two species, see "Teuthowenia." Geographical distribution chart modified from Voss, 1985.
Habitat and Ecology
Water temperature and chemistry ranges based on 1 sample.
Depth range (m): 600 - 600
Temperature range (°C): 8.710 - 8.710
Nitrate (umol/L): 34.258 - 34.258
Salinity (PPS): 35.077 - 35.077
Oxygen (ml/l): 1.831 - 1.831
Phosphate (umol/l): 2.038 - 2.038
Silicate (umol/l): 19.301 - 19.301
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
Life History and Behavior
The paralarval stage of T. maculata terminates at about 55 - 60 mm GL when the eyes become sessile. Generally a tubercule at the mantle-funnel fusion is not present in paralarvae. This species has chromatophores that are smaller, more numerous and more densely arranged than in the other species of the genus.
IUCN Red List Assessment
Red List Category
Red List Criteria
Teuthowenia maculata is an oceanic species which has a wide geographic distribution and inhabits deep-water, making it is less susceptible to human impact. It is also not targeted by fisheries and is unlikely to be in the future. However, since no adult has ever been reported, we must consider this species as Data Deficient since we hardly know it at all. Once adults have been described, more research is needed on the ecology and biology of this species.