Overview

Brief Summary

Taxon Biology

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Taxon Biology

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Comprehensive Description

Description

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Description

Hyastenus agassizi is a crab with an elongated triangular carapace. It has a visibly segmented body and grainy ridges on the sternum and abdomen.

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Distribution

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Physical Description

Morphology

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Size

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Diagnostic Description

Carapace oblong-triangular, slightly pointed behind, the regions well-defined, sparsely setose, tuberculated, or spinnlous, as follows: — 7 sharp tubercles or spinules disposed in a cross on the gastric region, 3 on the median line, 4 forming a Y on the cardiac region, one near the lateral boundary of that region, one on the intestinal region, 3 spines near the outer margin of the branchial region, 2 smaller spines further in, one marginal hepatic spine. Posterior margin granulate; parallel to it another row of granules.

The rostrum consists of 2 slender slightly divergent spines, which in the male are one-half as long as the carapace proper; margins rough with fine spinules and fringed with sets.

The angles of the supra-ocular eave are produced, the anterior is acuminate, the posterior acute; between it and the post-ocular lobe there is a small tooth on the orbital margin.

The basal antennal joint has a spine at its anterior outer angle visible from above. The merus of the outer maxillipeds is expanded at the antero-external angle.

The cheliped« and legs are more or less roughened. The chelipeds of the male are a little stouter than the trunk-legs and one and a third times as long as the carapace, enclusive of rostrum. The palm has on its outer face 2 longitudinal furrows which are continued on the fingers; these are gaping for twothirds their length.

The first ambulatory leg is two and a third times as long as the carapace (rostrum excluded); though longer than the second pair, there is hardly more difference than between the second and third. The fourth leg is missing. The merus joints are armed with 3 or 4 long slender spines, the carpal joints with two. Dactyli very slender and spinulous.

The ridges of the sternum and abdomen are granulated.

Dimensions. — Length of carapace exclusive of horns, 4.7 mm., width, 3.4 mm., length of horns, 2.3 mm (Rathbun 1902)"

"The females of this species have very slender chelipeds with long narrow palms and short fingers, which gape very slightly (Borradaile 1903; 687)."

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"The colour of this species as preserved in formalin is white with bright pink markings (Gardiner 2:687)."

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Type Information

Holotype for Hyastenus fraterculus Rathbun, 1916
Catalog Number: USNM 48291
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male;
Preparation: Alcohol (Ethanol)
Collector(s): United States Fish Commission
Year Collected: 1908
Locality: Tawitawi Island, Sangasiapu Island, Sulu Archipelago, Tawitawi Group, Philippines, North Pacific Ocean
Depth (m): 16 to 16
Vessel: Albatross R/V
  • Holotype: Rathbun, M. J. 1916. New species of crabs of the families Inachidae and Parthenopidae. Proc. U.S. Natl. Mus. 50 (2135): 527-559.
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© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

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Type for Hyastenus caribbaeus Rathbun, 1894
Catalog Number: USNM 16315
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male;
Preparation: Alcohol (Ethanol)
Collector(s): United States Fish Commission
Year Collected: 1884
Locality: Sabanilla, Colombia, Caribbean Sea, North Atlantic Ocean
Vessel: Albatross R/V
  • Type:
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Look Alikes

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Ecology

Habitat

Depth range based on 1 specimen in 1 taxon.

Environmental ranges
  Depth range (m): 18.2 - 18.2
 
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Depth range based on 3 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 22 - 77
  Temperature range (°C): 24.513 - 24.513
  Nitrate (umol/L): 15.217 - 15.217
  Salinity (PPS): 33.948 - 33.948
  Oxygen (ml/l): 2.605 - 2.605
  Phosphate (umol/l): 0.976 - 0.976
  Silicate (umol/l): 17.255 - 17.255

Graphical representation

Depth range (m): 22 - 77
 
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Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 1.2 - 1.2
  Temperature range (°C): 28.155 - 28.155
  Nitrate (umol/L): 0.047 - 0.047
  Salinity (PPS): 34.370 - 34.370
  Oxygen (ml/l): 4.544 - 4.544
  Phosphate (umol/l): 0.165 - 0.165
  Silicate (umol/l): 1.217 - 1.217
 
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Depth range based on 1 specimen in 1 taxon.

Environmental ranges
  Depth range (m): 18.2 - 18.2
 
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"Miss Rathbun's only specimen was taken in the same locality as ours, Nilandu Atoll, and in practically the same depth, 24 fathoms (Borradaile 1903; pg.688)."

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"It was dredged in South Nilandu, Male, Mulaku, Felidu and North Male Atolls in 25 — 30 fathoms (Borradaile 1903; pg. 687)."

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Migration

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Dispersal

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Trophic Strategy

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Associations

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Diseases and Parasites

Diseases

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Diseases

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Population Biology

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General Ecology

Ecology

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Ecology

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Life History and Behavior

Behavior

Behaviour

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Behaviour

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Cyclicity

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Life Cycle

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Life Expectancy

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Reproduction

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Growth

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Evolution and Systematics

Evolution

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Physiology and Cell Biology

Physiology

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Cell Biology

Cytology

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Cytology

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Molecular Biology and Genetics

Genetics

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Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:5
Specimens with Sequences:3
Specimens with Barcodes:3
Species:2
Species With Barcodes:2
Public Records:2
Public Species:2
Public BINs:2
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Barcode data

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Conservation

Conservation Status

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Conservation

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Conservation

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Threats

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Procedures

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Procedures

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Legislation

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Management

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Relevance to Humans and Ecosystems

Benefits

Uses

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Uses

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Risks

Risk Statement

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Risk Statement

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Wikipedia

Hyastenus

Hyastenus is a genus of crabs in the family Epialtidae, subfamily Pisinae, containing the following extant species:[1]

One further fossil species is known.[2]

References

  1. ^ Peter Davie & Michael Türkay (2012). "Hyastenus White, 1847". World Register of Marine Species. Retrieved May 17, 2012. 
  2. ^ Sammy De Grave, N. Dean Pentcheff, Shane T. Ahyong et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109. 


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