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Phylum Arthropoda
Subphylum Crustacea
Class Malacostraca
Order Tanaidacea
Family Apseudidae

Apseudes bermudeus Bacescu, 1980

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Apseudes bermudeus: anterior (enlarged) and posterior portions, after Bacescu, 1980

Taxonomic Characterization: Apseudes bermudeus is a very slender, hermaphroditic tanaid with a porcelain-like shiny integument lacking ornamentation. Only the edges of the integument have long hairs as does the dorsal side of the telson. The carapace is oval with weak ornamentation. The rostrum has two short "shoulders" without lobes and terminates suddenly in a strong, pointed spine. The eyes are conical and show a few shiny omatidia resting in a mass of brown pigment. The thoracomers represent only a little more that 1/2 of the body length and have no ornamentation and no lateral spines. The labrum is smooth, oval and bears a strong spine anteriorly. Adults possess o type chelipeds. The uropod has a short base that barely exceeds the apical tip of the telsonal triangle (Bacescu, 1980).

Disposition of Specimens: Female holotype with marsupial laminae deposited in "Grigore Antipa" Museum of Natural History, Cat. No. 503.

Ecological Classification: Stygobitic

Size: Length of body 2-2.3 mm, making it the 3rd smallest Apseudes.

Number of Species in Genus: At least 70, of which only three (A. orghidani, A. bermudeus, A. propinquus) have been found in caves.

Species Range: Known only from Walsingham Cave, Hamilton Parish, Bermuda (Bacescu, 1980).

Closest Related Species: A. bermudeus belongs to the group of the hermaphroditic A. intermedius.

Habitat: Anchialine limestone caves.

Ecology: A. bermudeus was collected in the marine lake at the entrance of Walsingham Cave. The bottom of this lake is covered by fine clay while the walls are rocky. It was often found in the presence of a Nannastacus species. The digestive tube was filled with yellowish-fine mud (Bacescu, 1980).

Life History: More than 40 specimens, many of which had marsupial laminae, and 5 juveniles but no males were collected (Bacescu, 1980).

Evolutionary Origins: A. bermudeus is allied with A. intermedius that has subspecies from Brazil and the Mediterranean.

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


  • Bacescu, M. 1980. Apseudes bermudeus n. sp. from caves around Bermude Islands. Acta Adriatica, 21(2): 401-407, 1 figure, 1 table.

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