Overview

Comprehensive Description

General Description

Caprellid, “Ghost” or “Skeleton” shrimps, so called for their skeletal appearance. Amphipod crustaceans, easily distinguished by the elongate stick-like body form and reduction of the abdominal appendages. Head is generally fused with pereonite 1. Pereopods on first 2 segments (pereonites) are most flexible and called gnathopods; gnathopods 2 being the largest, used in defense, feeding and substrate attachment. In many species pereopods 3 and 4 may also be reduced or absent. Gills on pereonites 3 + 4, rarely on pereonite 2. Pereopods 5 - 7 much smaller than 1 + 2, used for clinging to the substratum. In females, brood plates (öostegites) develop on pereonites 3 + 4. Much remains to be learnt about their biology, ecology and in many cases changing distributions.

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Distribution

An artic species which reaches its southernmost limits around Shetland.
  • Hayward, P.J.; Ryland, J.S. (Ed.) (1990). The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. Clarendon Press: Oxford, UK. ISBN 0-19-857356-1. 627 pp.
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Arctic to North Carolina, including Cobscook Bay
  • North-West Atlantic Ocean species (NWARMS)
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Hudson River estuary; Atlantic Canada: Bay of Fundy, Nova Scotia, Newfoundland; Gulf of St Lawrence: Nova Scotia, Prince Edward Island, New Brunswick, Gaspé; St. Lawrence River estuary; Saguenay fjord; Arctic Canada: west to 106°20’ north to 76°46’; Greenland (W+S); Norway; Denmark; Faroe Islands; Shetland Islands; Iceland; Newfoundland to North Carolina.

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Physical Description

Diagnostic Description

Notes

May be more spinose in northern waters.

Specimens labelled as Aeginina elevata at the National Museum of Natural History, Washington DC (202150, 41m off Delaware) are missing pereopods 5-7, but otherwise are very much like Aeginina longicornis. It is not clear where the name Aeginina elevata came from and it has hence been added as a synonym.

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Specimens

National Museum of Natural History, Washington DC: (NMNH) 26017 Off Newport Sta. 787 USFC (A. longicornis var. nodosa) 19ftms; (NMNH) 168 Gulf of Maine; USFC 1878Loc 169;

(NMNH) 202150 labelled Aeginina elevata

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Length: 7.7-50mm. Body smooth to very spinose, usually: one pair of dorsal head spines and lateral spines over gnathopod 2 insertions. Antenna 1 in adult males usually as long as body; antenna 2 shorter than antenna 1 peduncle. Gnathopod 1 propodus triangular, grasping margin of propodus and dactylus slightly serrate. Gnathopod 2 basis with strong antero-lateral spine; propodus slender, and with triangular projection antero-distally; palm with proximal projection bearing single spine, and with two distal projections separated by a cleft. In large adult males, both the distal cleft, and the notch distal to the grasping spine become much exaggerated. Gills elliptical. Pereopods 5 to 7 propodus bearing proximal grasping spines. Penes lateral, medially directed, and long.

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Ecology

Habitat

Found from the intertidal zone to 2258 m depth, but mostly from shallow water, over hard and algae covered substrate.
  • North-West Atlantic Ocean species (NWARMS)
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Depth range based on 845 specimens in 1 taxon.
Water temperature and chemistry ranges based on 430 samples.

Environmental ranges
  Depth range (m): 1 - 478
  Temperature range (°C): 3.452 - 17.229
  Nitrate (umol/L): 1.778 - 23.806
  Salinity (PPS): 32.125 - 35.761
  Oxygen (ml/l): 3.689 - 7.259
  Phosphate (umol/l): 0.390 - 1.497
  Silicate (umol/l): 2.170 - 17.288

Graphical representation

Depth range (m): 1 - 478

Temperature range (°C): 3.452 - 17.229

Nitrate (umol/L): 1.778 - 23.806

Salinity (PPS): 32.125 - 35.761

Oxygen (ml/l): 3.689 - 7.259

Phosphate (umol/l): 0.390 - 1.497

Silicate (umol/l): 2.170 - 17.288
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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<10 m to 2258 m. On algae, sea grass, hydroids, bryozoans and from the gut of the sea bass Centropristis.

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Diseases and Parasites

Diseases

Intermediate host to marine fish parasite: Echinorhynchus gadi

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Life History and Behavior

Life Cycle

Highest abundances sampled in August and September; ovigerous females absent from January to March.

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Reproduction

Extended maternal care

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Aeginina longicornis

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There is 1 barcode sequence available from BOLD and GenBank.   Below is the sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen.  Other sequences that do not yet meet barcode criteria may also be available.

NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNTCTTGGGTGTCTGAGCTGCCTTCTTTGGTACCTCCTTAAGAGTAATTATCCGGACAGAATTAATGGCCCCCGGGAATGTAATTGGAGATGACCAAATTTATAACGTAATTGTTACGGCCCATGCCTTCGTTATAATCTTTTTTATGGTAATACCTGTTATAATTGGGGGGTTTGGGAATTGGCTGGTTCCTTTAATATTAGGAAGACCAGATATGGCTTTTCCCCGTATAAATAATATAAGATTTTGACTTCTGCCCCCTTCCCTATCCTTACTTATTATTAGAGCTATAGTAGAAAGGGGGGTCGGAACAGGTTGAACTGTTTATCCCCCTTTAAGATCAAGCCTTGGACACCCGGGAGGGGCCGTAGACCTTGCTATTTTTTCATTACACCTGGCGGGTGCCAGCTCAATTTTAGGTGCTATTAATTTTATTTCTACAGTGATTAATATGCGAGCTGACGGTATATACATAGACCGAGTACCTTTGTTTGTTTGGTCTGTCTTTATTACGGCTATTTTACTCCTTTTATCGTTACCAGTACTCGCCGGAGCAATTACTATGCTATTAACAGACCGCAATTTAAACACCTCATTCTTTGACCCTCTTGGGGGCGGGGACCCTATTTTATACCAGCATTTATTC
-- end --

Download FASTA File
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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Aeginina longicornis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 9
Species With Barcodes: 1
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