Cumella (Cumewingia) bacescui Petrescu & Iliffe, 1992
Taxonomic Characterization: Small cumacean with slightly hairy
integument. The carapace represents 1/3 of the length of the body. The ocelli
crown consists of 7 lenses, 5 on the rostrum (2 pigmented) and 2 on the
pseudorostrum (absent in the female). The antennal notch is more prominent at
the male. In the female, the integument of the abdomen and the pleotelson is
scaled (Petrescu & Iliffe, 1992).
Disposition of Specimens: Grigore Antipa, Natural History Museum, collection number 747, inventory number 49,479.
Ecological Classification: Probably stygophilic (troglophilic)
Size: Adult male length ranged from 1.62-1.95 mm; adult ovigerous female 1.43 mm.
Number of Species in Genus: More than 60 species are included in the genus Cumella, while the subgenus Cumewingia contains about 20 species. None are known to be stygobitic.
Species Range: Rat Cay Blue Hole, Rat Cay, or Bluehole Cay Blue Hole (Forfar
Blue Hole), Stafford Creek, both on North Andros Island, Great Bahama Bank,
Bahamas. Samples collected from these two caves were combined so the specific
collection location is not known.
Closest Related Species: Resembles Cumella garrityi Bacescu & Muradian, 1977
Habitat: Marine limestone caves (ocean Blue Holes)
Ecology: Specimens were collected using a 0.3 mm mesh plankton net with a mouth diameter of 0.45 m set in the approximately 0.25 m/sec suck or blow currents at the mouth of Rat Cay and Bluehole Cay caves on Andros Island. Tidal inequalities across the broad, shallow water Bahama banks generate strong reversing currents through the caves with a period 2 to 3 hours out of phase with tides in the surrounding sea (Warner and Moore, 1984). While the inward or 'suck' currents draw slightly turbid seawater with normal temperature, salinity and dissolved oxygen levels into the caves, the outward flowing or 'blow' water is clearer, slightly cooler and may contain hydrogen sulfide.
Cumaceans were most abundant in the blow waters emanating from the Blue Holes. A total of 65 specimens were obtained in three blow plankton samples, while only 3 specimens were found in two suck samples. This indicates that these cumaceans are originating from the cave itself and are at least stygophiles if not stygobites. Blow samples in general were characterized by comparatively greater amounts of sand, crustacean exuvia, ostracod valves, fecal pellets, hydroid pieces, foraminiferans, small gastropods, ostracods, harpacticoid copepods, amphipods and isopods. Conversely, suck samples contained relatively more algal fragments and filaments, planktonic copepods and crustacean larvae (Warner & Moore, 1984).
Life History: The seven specimens have been collected included six adult males and one ovigerous female.
Evolutionary Origins: Probably originated from an open water ancestor.
Conservation Status: Restricted to Rat Cay or Bluehole Cay Blue Holes, North Andros Island, Bahamas.
Contributor: Iorgu Petrescu, Grigore Antipa Museum of Natural History,
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