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Phylum Arthropoda
Subphylum Crustacea
Class Malacostraca
Order Calanoida
Family Stephidae

Miostephos leamingtonensis Yeatman, 1980



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Miostephos leamingtonensis: dorsal views of female & male, after Yeatman, 1980

Taxonomic Characterization: The female Miostephos leamingtonensis has a 4-segmented prosome that is oval and lacking a rostrum. The urosome is tubular and 3-segmented. The 1st antenna is 24-segmented. Legs 2-4 have 4 spines and 4 setae on each terminal exopod segment. The proximal segments of the 5th legs are very elongate and are fused by only a narrow bridge. The male body shape is similar to the females', except the urosome is more elongate and 5-segmented. The distal segment of the right 5th leg of the male bears a small inner spine, a long apical seta and 2 lateral spinules. The terminal segment of the left 5th leg bears a thin flexible spine (Yeatman, 1980).

Disposition of Specimens: Male holotype deposited in the United States National Museum (USNM 171268); one female and two male paratypes (USNM 171269).

Ecological Classification: Stygobitic

Size: Body length of male without caudal setae ranges from 0.50 to 0.55 mm; body length of female without caudal setae ranges from 0.54 to 0.55 mm.

Number of Species in Genus: Two, both anchialine.

Genus Range:

  • Bermuda: Miostephos leamingtonensis Yeatman, 1980
  • Cuba: Miostephos cubrobex Bowman, 1976

Species Range: Known only from Leamington Cave, Bermuda (Yeatman, 1980).

Closest Related Species: M. leamingtonensis is closest to M. cubrobex, the only other species of the genus. They are similar in the 3-segmented female urosome, in the rudimentary right 5th leg of the male, in the elongate left 5th leg of the male and in the symmetrical and rudimentary 5th legs of the female (Yeatman, 1980).

Habitat: Anchialine limestone caves

Ecology: M. leamingtonensis inhabits Leamington Cave, Bermuda which had a water temperature of 28.1°C and a salinity of 25.5 ppt on the collection date. The specimens were collected by dragging a fine mesh plankton net through the large pool of the cave. They were collected near the bottom of the dark zone of the pool (Yeatman, 1980).

Life History: Collected specimens included 3 males and 2 females.

Conservation Status: Restricted to a single anchialine cave of Bermuda.

References:

  • Bowman, T.E. 1976. Miostephos cubrobex, a new genus and species of copepod from an anchialine pool in Cuba (Calanoida: Stephidae). Proceedings of the Biological Society of Washington, 89(11): 185-190.
  • Yeatman, H.C. 1980. Miostephos leamingtonensis, a new species of copepod from Bermuda. Journal of the Tennessee Academy of Science, 55(1): 20-21, 10 figures.

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