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Phylum Arthropoda
Subphylum Crustacea
Subclass Ostracoda
Order Podocopida
Family Bairdiidae

Havanardia keiji Maddocks, 1986



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Havanardia keiji: dorsal, right and left valve exteriors of adult male

Taxonomic Characterization: Havanardia keiji has a medium sized carapace, only moderately robust. The surface is covered by numerous, shallow, oval punctae plus superimposed microornament of densely spaced tiny pits. The left valve is bairdian in lateral view, and the right valve is more angulate in outline, with narrow anterior marginal frill. The hinge is normal bairdian, without accessory denticles. The fourth and fifth podomeres on the antenna are of equal length. The distal claw of the male is rather short, smoothly tapering to a small bent point, without hook. The palp and first two masticatory processes of maxillule each have one to three enlarged, curved, clawlike setae. The vibratory plate of male fifth limb has two featherless setae of equal length. The furca has seven setae. The hemipenis is large, and compact, and the copulatory tube is long (Maddocks & Iliffe, 1986).

Disposition of Specimens: All specimens were deposited in the United States Museum of Natural History: male holotype (USNM 216441) and paratypes (USNM 216442-216445).

Ecological Classification: Either stygophilic or accidental

Size: Total body length of adult male 1.11 mm.

Number of Species in Genus: Numerous

Species Range: Known from Deep Blue, Fern Sink, Green Bay, Palm, Prospero's, Small Fish Pond, Walsingham, Walsingham Sink, and Wonderland Caves, and from Harrington Sound and in reef sediments of Castle Harbor and South Shore reef in Bermuda (Maddocks & Iliffe, 1986).

Closest Related Species: The carapace and soft-part characters of Havanardia keiji show definite affinities with Aponesidea, differing primarily in the punctate and pitted ornament, the narrow ala, the masticatory processes of the maxillule, and the shorter copulatory tube. Further, H. keiji differs from the previously known Caribbean and West African species of Havanardia by its narrower ala, the straight posteriorly sloping course of the ala, and the ventral position of its caudal process (Maddocks & Iliffe, 1986).

Habitat: Anchialine limestone caves and inshore waters

Ecology: H. keiji is primarily found in caves and rarely in sediments in open waters. Some carapaces of H. keiji are overgrown by the discoidal, tubular, coiled test of an agglutinate foraminifer, showing that they had been at the surface of the sediment for some time. This species has ventrolateral keels which might facilitate clinging tightly to an exposed rocky substrate in strong currents and thus make it easier to colonize the caves (Maddocks & Iliffe, 1986).

Life History: Collected specimens included 1 male, 163 empty carapaces and 3 subfossil valves.

Evolutionary Origins: H. keiji is one of the most abundant species from empty in caves, but also living. They are very rare in sediments from open water environments. It seems likely that this species characteristically dwells in caves and cryptic habitats with low standing populations and low sedimentation rates, so that their empty carapaces are relatively abundant in the cave sediments (Maddocks & Iliffe, 1986).

References:

  • Maddocks, R.F. and T.M. Iliffe. 1986. Podocopid Ostracoda of Bermudian caves. Stygologia, 2: 26-76, 18 figures.

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Contributor: Dr. Rosalie F. Maddocks, University of Houston, Houston, Texas USA


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