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Phylum Arthropoda
Subphylum Crustacea
Subclass Ostracoda
Order Myodocopida
Family Philomedidae

Pseudophilomedes kylix Kornicker & Iliffe, 1989



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Pseudophilomedes kylix: complete specimen from left side

Taxonomic Characterization: The female P. kylix has an elongate carapace with the dorsal margin evenly rounded but with a depressed straight posterodorsal hingeline. The carapace has posterior protuberances. The endopodites of the 2nd antenna have 1 proximal anterior bristle, compared to 2 in other species. The bellonci organ is elongate. The medial eye tapers distally and the lateral eye is small. The genitalia is represented by a small oval ring on each side of the body. The male carapace is similar to the females' except posterior more acuminate dorsally. The infold, selvage and central adductor muscle attachments are similar in both sexes. The male lateral eye is well-developed and the genitalia is represented by sclerotized hooked tips and several bristle-bearing lobes.

Disposition of Specimens: Female holotype from Cathedral Cave deposited in United States National Museum (USNM 193395); paratypes from Cathedral, Cherry Pit, Green Bay, Myrtle Bank and Walsingham Caves (USNM 193384 to 193394, 193396, 193154 and 193155).

Ecological Classification: Stygophilic

Size: Length of carapace in males 0.93-0.95 mm, in females 1.06-1.13 mm.

Number of Species in Genus: At least five of which P. kylix is the only anchialine species. In the open sea, the known depth range of the genus is 6-534 m.

Genus Range:

  • Bahamas, Great Bahama Bank: Pseudophilomedes ferulanus Kornicker, 1958
  • Bermuda: Pseudophilomedes kylix Kornicker & Iliffe, 1989
  • Gulf of Mexico and Atlantic continental shelf: Pseudophilomedes darbyi Kornicker, 1989
  • Gulf of Naples: Pseudophilomedes foveolatus Muller, 1894
  • Gulf of Mexico continental shelf: Pseudophilomedes ambon
  • Western coast of Africa:

Species Range: Known only from Cathedral, Cherry Pit, Deep Blue, Green Bay, Myrtle Bank and Walsingham Caves, Bermuda (Kornicker & Iliffe, 1989).

Closest Related Species: P. kylix is closest to P. ferulanus from the Bahamas.

Habitat: Anchialine limestone caves

Ecology: P. kylix is believed to live outside of caves as well as within, due to the presence of well developed lateral eyes. Specimens were collected at depths ranging from 0-21 m. Gut content consisted of a brown, unrecognizable mass.

Life History: 15 specimens were collected. Two females contained 4 and 5 large, unextruded eggs. Pseudophilomedes kylix has 4 juvenile instars. Instar I consisted of two individuals of undetermined sex; instar II is absent from the collections; instar III is represented by 1 females and 2 males; instar IV by 3 males; and adults by 3 females and 3 males.

Conservation Status: Restricted to six anchialine caves of Bermuda.

References:

  • Kornicker, L.S. 1958. Ecology and taxonomy of recent marine ostracodes in the Bimini Area, Great Bahama Bank. Publications of the Institute of Marine Science, University of Texas, 5: 194-300, 89 figures.
  • Kornicker, L.S. and T.M. Iliffe. 1989. Ostracoda (Myodocopina, Cladocopina, Halocypridina) from anchialine caves in Bermuda. Smithsonian Contributions to Zoology, 475: 1-88.
  • Muller, G.W. 1894. Die Ostracoden des Golfes von Neapel und der angrenzenden Meeres-Abschmitte. Fauna und Flora des Golfes von Neapel, 21: 404 pages, 40 plates.


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