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Phylum Arthropoda
Subphylum Crustacea
Class Malacostraca
Order Tanaidacea
Family Apseudidae

Apseudes orghidani Gutu & Iliffe, 1989



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Apseudes orghidani: body, dorsal view

Taxonomic Characterization: The body of A. orghidani is dorso-ventrally flattened and five times longer than the maximum width at the first free pereonite. The carapace is nearly as wide as it is long. Two antero-laterally rounded ocular lobes lack obvious visual elements. The pereon is about 2.5 times longer than the maximum width, with each pereonite being much wider than its own length. Each pereon has numerous long plumose setae. The antennule shows fine denticulation laterally along the inner edge and has long plumose setae on the distal half. Processus molaris are well developed in the mandible which has a palp consisting of three articles. There are 5 pairs of oostegites, 5 pairs of biramous pleopods and a fine, very long uropod. The body is strongly chitinized (Gutu & Iliffe, 1989).

Disposition of Specimens: Female holotye deposited in "Grigore Antipa" Museum of Natural History, Cat. No. 250,045/691. Four manca stage I specimens in United States National Museum, USNM 227129 and ten in the private collection of Modest Gutu.

Ecological Classification: Although so far collected only from caves, the strongly chitinized body indicating that it may not be cavernicolous.

Size: Length without antennule and uropods about 5 mm.

Number of Species in Genus: 66, of which only three (A. orghidani, A. bermudeus, A. propinquus) have been found in caves.

Species Range: Known only from Cripplegate Cave, Hamilton Parish, Bermuda (Gutu & Iliffe, 1989).

Closest Related Species: A. orghidani is similar to A. africanus, A. holthuisi, A. spectabilis, A. nagae in respect to morphological characters of the body and appendages.

Habitat: Anchialine limestone caves.

Ecology: A. orghidani was collected from Cripplegate Cave, a tidal spring located along the shoreline of Harrington Sound, Hamilton Parish, Bermuda. Harrington Sound is a nearly enclosed inland body of marine water characterized by delayed tides with a 30% amplitude compared to those of the adjacent ocean. This cave is one entrance to the Palm Cave System, which probably communicates with Castle Harbour located 0.5 km away. Specimens were collected with a plankton net that was submerged across the entrance of the cave for a period of 6 hours while tidal currents were flowing out of the cave.

Life History: One female with oostegites and 14 manca I specimens were collected.

Conservation Status: Restricted to a single anchialine cave.

Reference:

  • Gutu, M. and T.M. Iliffe. 1989. Apseudes orghidani, a new species of Tanaidacea (Crustacea) from an anchialine cave on Bermuda. Travaux du Muséum d'Histoire naturelle "Grigore Antipa", 30:161-167, 2 figures.

Links:

Contributor: Modest Gutu, Muzeul de Istorie Naturala "Grigore Antipa", Bucharest, Romania.


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