Atlas of Atlantic Ostracods
Taxon details
Archiconchoecissa aff. cucullata (Angel, 1983)
- Order:
- MYODOCOPA
- Suborder:
- Halocypridina
- Family:
- Halocyprididae
- Subfamily:
- Archiconchoecinae
- Size range (females):
- 1.58-1.80 mm
- Size range (males):
- 1.62-1.82 mm
- Depth:
- mesopelagic
Notes
172 records
There are two size forms of the species that corresponds to Brady’s (1902) original description of Archiconchoecia cucullata. The size of the larger sensu strictu form is found at higher latitudes and in deeper water than this, the small form. Where the two forms are sympatric at latitudes <40° they are segregated bathymetrically; the larger form submerges to bathypelagic depths, and is replaced at mesopelagic depths by the smaller form. Chavtur and Stovbun (2003) have recently revised the Archiconchoecini, and have classified the relatively large and highly ornamented species in a new genus Archiconchoecissa, designating A. pljusnini as the type species. All previous records of cucullata from latitudes <40° may have been of one or other or both these size groups. The bathymetric profiles suggest that when the sampling was restricted to the upper 1000m all the specimens were likely to have been this, the smaller of the two species. We have examined specimens from subtropical latitudes in the South-western Indian Ocean and found their sizes match those given here for the small form
| Subtropical Atlantic | n | Mean mm | s.d. | Range |
|---|---|---|---|---|
| Females | 184 | 1.72 | 0.047 | 1.60-1.92 |
| Males | 147 | 1.78 | 0.043 | 1.68-1.86 |
| A-1 | 116 | 1.39 | 0.054 | 1.24-1.50 |
| A-2 | 97 | 1.08 | 0.040 | 0.98-1.18 |
| A-3 | 14 | 0.85 | 0.032 | 0.80-0.90 |
| A-4 | 1 | 0.72 |
