Hyastenus hilgendorfi

Hyastenus hilgendorfi is a species of spider crab from the family Epialtidae, classified in the sub-family Pisinae, from the Indo-Pacific region. It has been recorded in the Suez Canal and there have been a few records in the eastern Mediterranean, making it a Lessepsian migrant.

Hyastenus hilgendorfi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Decapoda
Infraorder: Brachyura
Family: Epialtidae
Genus: Hyastenus
Species:
H. hilgendorfi
Binomial name
Hyastenus hilgendorfi
(de Man) , 1887)[1]

Description

Hyastenus hilgendorfi has a roughly pear-shaped carapace which is convex and bearing small tubercles and a downy coat, there is a small epibranchial plug. There are prominent projections on the gastric region, heart and gut. A pair of post-gastric tubercles are close to the orbits. Six mesobranchial tubercles are sub-equal to the sides of the midline. There are two divergent rostral spines, which have a length of two-thirds of the carapace in males but are much smaller in females. The retractable eyestalks are small. The chelipeds are the same length as the carapace, the merus has nodules in its proximal portion while the claw is smooth and glabrous. The merus of the pereopods also bear nodules, while the posterior border of the dactyl is spiny, the spines becoming successively larger distally. The separation of the rostral spines is u shaped or keyhole shaped.[2][3] H. holgendorfi is a brownish colour.[3]

Distribution

Hyastenus hilgendorfi occurs from the Red Sea through the Indian Ocean to the western Pacific to Hawaii and south to Australia.[4] It is reported to occur throughout the Suez Canal and the first record in the Mediterranean was recorded off Israel in 1960.[5] The second record was in 1977 ad the third in 2004, which may mean there is a small population in the south eastern Mediterranean.[6]

Biology

Hyastenus hilgendorfi is found on seabeds of coarse sand, debris and gravel, between 2 and 93 metres in depth.[3] It is a "decorator crab" which uses other organisms to cover its body and in a study in the Suez Canal the barnacle Amphibalanus amphitrite, the tunicate Microcosmus sp., and the tube worm Hydroides elegans were found to be the most frequent epibionts.[7] and up to 49 species of epbionts have been recognised for this species in the Suez Canal. The purpose of the decoration in this species seems is to camouflage the crab and disguise its shape.[8]

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gollark: To try and unmute themselves, presumably.
gollark: Praise the R O B O D A N.
gollark: Selfmute, I can confirminate.
gollark: The user gnu-nobody was banned for rule 10 issues, and I think this made palaiologos leave.

References
  1. Michael Turkay (2004). "Hyastenus hilgendorfi de Man, 1887". World Register of Marine Species. Retrieved 3 March 2017.
  2. K. Sakai. "Carbs of Japan - Hyastenus hilgendorfi". Marine Species Identification Portal. ETI Bioinformatics. Retrieved 5 March 2015.
  3. "Hyastenus hilgendorfi de Man, 1887" (PDF). Identificazione e distribuzione nei mari italiani di specie non indigene (in Italian). Istituto Superiore per la Protezione e la Ricerca Ambientale. Retrieved 5 March 2017.
  4. D.J.G. Griffin (1968). "Hyastenus hilgendorfi de Man A Majid Spider Crab New to Australia". Australian Zoologist. 15 (1): 103–106. CiteSeerX 10.1.1.375.9601.
  5. Ch. Lewinsohn; L.B Holthuis (1964). "New Records of Decapod Crustaceans from the Mediterranean Coast of Israel and the Eastern Mediterranean". Zoologische Mededelingen. 40 (8): 45–63.
  6. Bella S. Galil (2006). "A rare record of Hyastenus hilgendorfi de Man, 1887 (Crustacea: Decapoda: Majidae) from the Levant". Aquatic Invasions. 1 (4): 284–285. doi:10.3391/ai.2006.1.4.12.
  7. W. S. Sallam; M. K. Wicksten (2011). "Hyastenus Hilgendorfi (De Man, 1887) (Brachyura, Pisidae): A Heavily Encrusted Decorator Crab Inhabiting the Suez Canal". Crustaceana. 84 (2): 203–219. doi:10.1163/001121610X551872.
  8. Wafaa S. Sallam; Fedekar F. Madkour; Mary K. Wicksten (2007). "Masking Behavior of the Spider Crab, Hyastenus hilgendorfi (De Man, 1887) (Brachyura, Majidae) from the Suez Canal, Egypt". Crustaceana. 80 (2): 235–245. doi:10.1163/156854007780121447. JSTOR 20107799.
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