Psalidopus
A shrimp genus with its own family and superfamily.
Psalidopus is a shrimp genus so distinct it has its own family, Psalidopodidae, and superfamily, Psalidopodoidea. The group contains three species: one lives in the western Atlantic, while the other two are found in the Indo-Pacific.
The Atlantic species, Psalidopus barbouri, inhabits steep, soft muddy slopes (sometimes mixed with sand) off Florida, the Bahamas, the Gulf of Mexico, and parts of the Caribbean, possibly as far south as Suriname. It occurs at depths of 400–800 meters, where water temperatures range from 6.1 to 10.0 °C. Adults have a carapace 13–32 mm long, and the total body length—from rostrum tip to tail tip—can reach up to 5.5 times that carapace length.
In the Indo-Pacific, Psalidopus huxleyi lives on steep slopes of various bottom types across the Indian Ocean (including the Laccadive Sea, off southern India, the Andaman Sea, and the Timor Sea) and the western Pacific (from southern Japan to the Philippines, the Sulu Sea, and the Celebes Sea). Its depth range is 500–100 meters, with temperatures between 5.9 and 13.6 °C, and its carapace measures 10–30 mm.
The third species, Psalidopus tosaensis, lives much deeper—around 2,800 meters—and in colder water (1.6 °C) than either of its relatives. Although it is geographically closer to P. huxleyi, it appears to be more closely related to P. barbouri.
Quick Facts
- Grandparent Authority
- Wood-Mason, 1892
- Taxon
- Psalidopus
Facts from the source article.
Lore & Background
Psalidopus barbouri occurs on continental and insular slopes from Florida, the Bahamas and the Gulf of Mexico, to parts of the Caribbean Sea, perhaps extending as far south as Suriname. It lives on steeply sloping soft muddy bottoms, sometimes mixed with sand, at depths of 400–800 m, where the temperature ranges from 6.1 to 10.0 °C. Adults have a carapace length of 13–32 mm, with total length up to 5.5 times longer than the carapace.
Psalidopus huxleyi occurs on continental and insular slopes across the Indian Ocean, including the Laccadive Sea, off southern India, the Andaman Sea and the Timor Sea, as well as in the western Pacific Ocean from southern Japan to the Philippines, the Sulu Sea, and the Celebes Sea. It lives on steeply sloping bottoms of various compositions and consistencies, at depths of 500–100 m, where the temperature ranges from 5.9 to 13.6 °C. Its carapace is 10–30 mm long.
Psalidopus tosaensis lives at greater depth (c. 2800 m) and lower temperature – 1.6 °C – than either of the other species. Although it is geographically closer to P. huxleyi, it appears to be more closely related to P. barbouri.
Reader's Guide
The genus Psalidopus is notable for being placed in its own family and superfamily, indicating a distinct evolutionary lineage among marine shrimp. Its three species occupy separate ocean basins, with one in the western Atlantic and two in the Indo-Pacific. The species show depth and temperature specialization: P. barbouri and P. huxleyi inhabit continental and insular slopes at moderate depths (400–800 m and 500–100 m respectively), while P. tosaensis lives much deeper at about 2800 m and a colder temperature of 1.6 °C. The article notes that despite geographic proximity to P. huxleyi, P. tosaensis appears more closely related to P. barbouri, suggesting a complex biogeographic history. The depth ranges and temperature tolerances given for each species provide ecological context for their distribution. The carapace length measurements and total length ratio for P. barbouri offer morphological detail. The article does not discuss any broader significance or legacy beyond these biological and taxonomic facts.
Did You Know?
- Psalidopus is placed in its own family, Psalidopodidae, and superfamily, Psalidopodoidea.
- Psalidopus barbouri occurs from Florida to the Caribbean Sea, possibly as far south as Suriname.
- Psalidopus tosaensis lives at about 2800 m depth, where the temperature is 1.6 °C.
- Psalidopus tosaensis is geographically closer to P. huxleyi but appears more closely related to P. barbouri.
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