Troglocyclops janstocki Rocha & Iliffe, 1994
Troglocyclops janstocki: after Rocha & Iliffe, 1994
Taxonomic Characterization: "The species is the most primitive member
of the Halicyclopinae because of the presence of 15-segmented antennules,
mandibular palp reduced to 3 setae, one of them quite long and plumose, a
bisegmented maxilary endopodite, and 3 segments in the maxilliped endopodite.
These copepods possess the first pediger still distinct, being partially
enclosed dorsally and laterally by a carapace-like extension of the posterior
margin of the dorsal cephalic shield. The species has two apical spines on the
terminal segment of the exopodite of legs 2-4, and the intercoxal sclerites of
the legs 1 and 2 sexually dimorphic" (Rocha & Iliffe, 1994).
Ecological Classification: Stygobitic
Size: Female body length measures between 0.97-1.08 mm. Adult male length measures 0.71-0.86 mm
Number of Species in Genus: One
Species Range: Known only from Hatchet Bay Cave, Eleuthera Island,
Habitat: Anchialine limestone caves
Ecology: Found free-swimming at depths of 3 m in fully marine salinity waters.
Life History: A total of 7 females, 26 males and 23 copepodids have been collected
Evolutionary Origins: "It seems reasonable to assume that Troglocyclops diverged early from the cyclopid lineage. In Bahamian anchialine caves, its further evolution involved developing characteristic features such as the inner apical spine on the terminal segment of exopodite of legs 2-4 and the sexual dimorphism in the armature of the intercoxal sclerites of the legs 1 and 2, while retaining several primitive characters" (Rocha & Iliffe, 1994).
Conservation Status: Restricted to a single anchialine cave on Eleuthera.
Contributor: Carlos Eduardo F. da Rocha, Universidade de São Paulo,
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