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 photos copyright John P. Hoover unless otherwise credited

Some interesting shrimps not in Hawaii's Sea Creatures
(Unofficial?) Bishop Museum list of some Hawaiian shrimps:

caridean shrimps (most reef shrimps)

Thor spinosus Boone, 1935
Family Stenopodidae
    O'ahu diver Damaris Torres-Pulliza found two of these tiny shimps inhabiting a crevice in a head of Porites lobata coral and was able to visit them multiple times. One was smaller than the other. She sent her photos to shrimp specialist Dr. Charles Fransen in the Netherlands. He replied with the ID above. He also mentioned that he knew of only one other photo of the species, so it appears that Dama's photo of this beautiful shrimp is also quite rare! The species is known from East Africa to Hawai'i and French Polynesia. The one in the top photo looks to be about 2 cm. long (about .75 inch).

BLUE CORAL SHRIMP
Stenopus tenuirostris de Man, 1888
Family Stenopodidae
     Roney Rodrigues and Damaris Torres-Pulliza made an exciting find when they photographed two pairs of these shrimps off West Oahu in June, 2021. As far as I know, the species has never before been recorded from Hawai'i, though it ranges widely in the Indo-Pacific from East Africa to the Marquesas Islands in French Polynesia. The two pairs were about 100 ft. apart at a depth of about 40 ft. Blue eggs are visible under the abdomen of at least one of them, so they do seem to be reproducing here. For now these shrimps are extremely rare; hopefully they will become more numerous in time. Reports of additional sightings would be very welcome.

HAWAIIAN BLACK CORAL SHRIMP
Pontonides sp.
Family Palaemonidae
     Marketa Murray photographed these small shrimps on Hawaiian Black Coral Antipathes griggi at a North Kohala dive site in October 2020. The depth was about 40 ft. Although they resemble the Barred Wire Coral Shrimp Pontonides ankeri, which lives in pairs on Wire Coral Cirrhipathes anguina and Red Wire Coral Stichopathes sp., Marketa's shrimps live in colonies of perhaps hundreds of individuals and on a quite different host. They likely represent an undescribed species, very probably in the genus Pontonides and perhaps endemic to Hawai'i. Specimens have been collected and await examination by specialists. These shrimps have also been photographed on black coral off Maui. Reports of other sightings would be welcome.

STARRY CLEANER SHRIMP
Lysmata acicula? (Rathbun, 1906)
Family Hippolytidae
   A photo of this shrimp appears in Hawaii's Sea Creatures on p. 235. In earlier printings it was incorrectly identified as Lysmata ternatensis. Recent photos of the real L. ternatensis show a striped shrimp, not a spotted one. Obviously, then, this is something else. I sent the photos to Dr. Sammy de Grave of Oxford University, who thinks that it is probably a species originally described by zoologist Mary Jane Rathbun in 1906 from 4 specimens found under a tugboat in Honolulu and one specimen dredged off Kauai. Rathbun named her shrimp Hippolysmata acicula. Unfortunately, as was typical in those days, she did not note the color of the live animal. In 1997 Rathbun's specimens were examined by zoologist Fenner Chace of the Smithsonian, who declared that H. acicula was the same as Lysmata ternatensis, a species from Indonesia that had been described and named several years earlier, in 1902. However, the museum specimens Chace examined were bleached and devoid of color. Now that photos of the living animals are available, it's clear that the species pictured here and in my book is not ternatensis. However, to prove that these Hawaiian ones are indeed Rathbun's acicula (or possibly something else), several need to be collected, photographed, and examined. Unfortunately, they are very rarely seen. If you find these shrimps anywhere, please let me know. Specimens needed! (Thanks to Dennis McCrea and Debra Newbery for finding this pair and showing them to me! Debra has taken some terrific video of these shrimp interacting with a Banded Coral Shrimp, Stenopus hispidus, and an unidentified portunid crab.

Update: In December 2010 Dennis McCrea found and collected two of these rare animals and sent them to Dr. de Grave, who is in the process of determing whether they are Rathbun's acicula or a new species. Meanwhile, I have made bold and changed the name in my book to L. acicula.

UNIDENTIFIED
Metapenaeus? sp.
Family Penaeidae
   Paul Okumura took this photo of a sand-dwelling shrimp in Kona off "Mile Marker Four" on Alii Drive at a depth of about 40 feet. I sent the photo to Dr. Tin-Yam Chan in Taiwan, who answered:

Your penaeid photo does not show much as the shrimp is burying in sand. I am sorry that I can not identify it positively, though it is likely a Metapenaeus judging from coloration (there are many species in Metapenaeus and their coloration are very similar). But juvenile of Penaeus s.l. and some Metapenaeopsis sometimes also with this green body and dotted coloration.

The Bishop Museum records only one species in the genus Metapenaeus as occurring in Hawaii: Metapenaeus affinis. So that is one possibility. I was impressed by the blue-green coloration, as sand-dwelling shrimps of this sort that I have seen before have all been reddish. However, shrimps that are reddish at night are sometimes bluish or greenish by day, and Paul took this photo in the late morning.

EYESPOT SHRIMP
Saron neglectus De Man, 1902
Family Hippolytidae
     A photo of this shrimp appears in Hawaii's Sea Creatures on p. 233, photographed out of its natural habitat but clearly showing the two dark "eyespots" on the upper rear of its carapace. The photos above show the shrimp as it appears in its natural habitat, with eyespots out of sight or barely visible (as on the shrimp in the bottom photo).
     According to Japanese shrimp expert, Dr. Junji Okuno, an almost identical Saron shrimp that lacks false eyespots has also been identified as Saron neglectus. That shrimp is widespread in the Indo-Pacific, but absent from Hawaii. If the "eyeless" shrimp turns out to be the true neglectus, then the species pictured above could be un-named. The uncertainty is probably due to the original neglectus having been described from colorless museum specimens. Dr. Okuno has compared the two and has found no significant differences except for the color pattern.

PEARL OYSTER SHRIMP
Conchodytes meleagrinae Peters, 1852
Subfamily Palaemoninae
   Shine your dive light into a Blacklipped Pearl Oyster, and quickly, before it closes its valves, you just might catch a glimpse of one of these fat little commensal shrimps. They live inside these oysters, probably never leaving their host. Although I mentioned this shrimp in my book in the pearl oyster writeup, I misspelled the scientific name as Conchodytes meleagris. (This has been corrected in the latest printing.) The American Fisheries Society has given it the official common name "Hawaiian pearloyster shrimp," which makes little sense because the species is widespread in the Indo-Pacific. David Fleetham grabbed this rare photo off Kaanapali, Maui, at a depth of 40 ft. Visit Dave's website at http://davidfleetham.com/

STARRY CORAL SHRIMP
Harpiliopsis beaupressi (Audouin, 1825)
Subfamily Pontoniinae
     I found several of these in a head of Cauliflower Coral (Pocillopora meandrina) at Ho`okena, Hawai`i at a depth of about 20 ft. They were difficult to photograph as they kept moving out of sight around the coral, and this is the best I could do. I had never seen the species before, and have not found it since. The shrimp has a wide Indo-Pacific distribution, from Africa to Easter Island, and always associates with branching corals (Pocillopora, Seriatopora, Stylophora, rarely Acropora).

EASTER SHRIMP
Thor paschalis (Heller 1862)
Family Hippolytidae
     Crazy name--why "Easter"?? Who knows, but that's the meaning of paschalis, the Latin species name. Likely the shrimp was discovered or named on Easter Sunday. It is only about 1/4 in. long, thus rarely noticed. It belongs to the genus Thor, which has only five known species. Thor paschalis is widespread in warm seas throughout the Indo-Pacific but little else seems to be known about it. The animal in the top photo was collected by Cory Pittman off Maui and sent to Dr. Alain Crosnier in Paris for identification, so the ID is sound. The bottom photo was taken by Scott Rettig at South Point, Hawai`i. I am guessing that the two are the same species, but examination of a specimen by a specialist would probably be necessary to confirm this.

Urocaridella sp.
Subfamily Palaemoninae
     According to Dr. Junji Okuno, an expert on shrimps of the genus Urocaridella, this species has not yet been named or described. It occurs from Hawai`i to the Western Indian Ocean and is similar in appearance and habits to the Clear Cleaner Shrimp Urocaridella antonbrunii on p 222. of Hawaii's Sea Creatures. I photographed it during the summer of 2005 at Makua, O`ahu, at a depth of about 45 ft. The eel is a Yellowmargin Moray, Gymnothorax flavimarginatus. (I have added this photo to the revised April 2010 printing of Hawaii's Sea Creatures.)

Exocliminella maldivensis Duris & Bruce, 1995.
Subfamily Palaemoninae
     Mike Roberts photographed this beautiful little shrimp off Maui, at a depth of about 40 ft.. The ID was confirmed by Dr. Junji Okuno in Japan. Mike's photo is the first I know of from Hawai`i, though the shrimp appears to occur throughout much of the tropical Indo-Pacific. Mike says that the bright colors, esp. the blue, help him find these shrimps, which are very secretive and live in rubble. The first Hawaiian record of this species was made by researchers from the Bishop Museum, who collected it on the Atlantis wreck off Waikiki in 2001. Size of specimens in the original description was 12-16 mm., or around 1/2 in. (I have added this species to the 2014 printing of Hawaii's Sea Creatures.)

Cuapetes grandis? - photos above and below copyright 2007 by Mike Roberts