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Phylum Arthropoda
Subphylum Crustacea
Subclass Copepoda
Order Cyclopoida
Family Cyclopidae
Subfamily Halicyclopinae


Halicylops herbsti Rocha & Iliffe, 1993


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Halicylops herbsti: habitus, dorsal, after Rocha & Iliffe, 1993

Taxonomic Characterization: Female: Margins of all prosomites smooth. Genital double somite as long as wide and slightly expanded into lateral protrusions at proximal third. Hyaline frills of posterior border of genital double somite and urosomite 3 with ventral denticles longer and more slender than dorsal ones. Hyaline frill of urosomite 4 with dorsomedial denticles longer than lateral ones, but not forming anal pseudoperculum. Caudal rami as long as broad. Antennule 6-segmented. Antenna bearing 8 setae on inner margin of terminal segment. Leg 1 basis with spine at inner corner reaching posterior border of endopod segment 1. Proximal seta on endopod segment 3 of legs 2-3 spiniform, plumose basally and serrate terminally. Both setae on leg 4 endopod segment 2 plumose. Leg 5 exopod 1.5 times longer than broad (Rocha & Iliffe 1993).

Disposition of Specimens: Type specimen was deposited in the National Museum of Natural History, Smithsonian Institution, Washington, D.C. (USNM 257018).

Ecological Classification: Stygobitic or stygophilic

Size: Female 500 microns, prosome:urosome ratio = 1.75 : 1.

Number of Species in Genus: Numerous

Species Range: Known only from Green Bay Cave in Hamilton Parish, Bermuda.

Closest Related Species: Halicyclops herbsti resembles H. laciniatus from Barbados in the ornamentation of the hyaline frill of the urosomite 4, the structure of the leg 4 endopod segment 3, and the proportions of the caudal rami. However, they differ in the general outline of the genital double somite, the relative length of the dorsal seta of caudal rami, and the lengths of the spines of leg 5 in relation to the length of the exopod (Rocha & Iliffe, 1993).

Habitat: Anchialine limestone caves

Ecology: Marine, found at 12 m depths in cave waters.

Life History: Collected specimens included only 1 female.

Evolutionary Origins: Halicyclops is a cosmopolitan genus found mainly in coastal brackish waters such as estuaries, lagoons, ponds. marshes, wells, interstitial water in sandy beaches, and caves (Rocha & Iliffe, 1993).

Conservation Status: Restricted to Green Bay Cave in Hamilton Parish, Bermuda.

References:

  • Rocha, C.E.F. and T.M. Iliffe. 1993. New cyclopoids (Copepoda) from anchialine caves in Bermuda. Sarsia, 78:43-56, 44 figures.

Links:

Contributor: Carlos Eduardo F. da Rocha, Universidade de São Paulo, Brazil


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