Hippa adactyla

Hippa adactyla is a species of small, sand-burrowing decapod crustacean found living along the coasts of Indo-West Pacific waters. It is found on exposed sandy beaches in the swash region of the intertidal zone.

Hippa adactyla
Hippa adactyla, a 22-mm specimen from Palabuhanratu, Sukabumi Regency
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Malacostraca
Order:
Decapoda
Infraorder:
Anomura
Family:
Hippidae
Genus:
Hippa
Species:
H. adactyla
Binomial name
Hippa adactyla
Synonyms
  • Remipes testudinarius Latreille, 1806[2]
  • Remipes denticulatifrons White, 1847

Description
Frontal region close up
Ventral with big telson

A small crustacean. Carapace ovate, more long than wide; neotype measurements: 25.1 mm × 22.5 mm.[3] Females tends to have larger bodies than males; on the southern coast of Java, the carapace length is 17.6–34.9 mm in females or 18.1–27.7 in males.[4]

According to Haig (1974):[5]

"Carapace densely covered with sharply serrate, transverse lines. Frontal margin five-toothed; outer pair narrow, triangular, and sharp-pointed, and in adults projecting well beyond inner ones; inner pair rounded; between them a small median denticle, broadly triangular and scarcely produced. A row of 50–55 shallow, setiferous, slightly elongate pits near each lateral margin, forming a narrow band. Antennal flagellum with 3–6 articles, the number increasing with age. Dactyl of second and third legs deeply falcate, distal and proximal portions of the concave margin meeting at a right angle."

Distribution
Hippoidea spp. cooked and sold as rice crackers, in southern coasts of Central Java

Hippa adactyla occurs in Indo-West Pacific waters: from Madagascar eastward to the Marquesas Islands, northward to Japan (Misaki, Sagami Bay), and southward to Queensland (Australia).[6]

This small crustacean is especially found on sandy bottoms of low intertidal to shallow subtidal.[6]

Uses

Known locally as yutuk in southern coasts of Central Java, this crustacean is often caught by local people and cooked as a delicacy.[4]

gollark: I believe we are seeing the initial wave of eggs about 5 hours post-release.
gollark: This is the one time when my lack of relevant reflexes is helpful.
gollark: Some evil individual attacked my fort!
gollark: * their
gollark: I think the profile's said "busy" for months.

References
  1. Johan Christian Fabricius (1787). Mantissa insectorum sistens eorum species nuper detectas adiectis characteribus genericis, differentiis specificis, emendationibus, observationibus... I. Copenhagen: C.G. Proft. p. 329.
  2. Pierre André Latreille (1806). Genera crustaceorum et insectorum : secundum ordinem naturalem in familias disposita, iconibus exemplisque plurimis explicata. I. Paris & Strasbourg: Apud Amand Knig, Bibliopolam. p. 45.
  3. J. Haig (1970). "The status of Remipes testudinarius Latreille, and designation of a neotype for Hippa adactyla J.C. Fabricius (Decapoda, Hippidae)". Crustaceana. 19 (3): 288–296. doi:10.1163/156854070x00374. JSTOR 20101744.
  4. W. Muzammil, Y. Wardiatno & N. A. Butet (2015). "Rasio panjang-lebar karapas, pola pertumbuhan, faktor kondisi, dan faktor kondisi relatif kepiting pasir (Hippa adactyla) di pantai berpasir Cilacap dan Kebumen" (PDF). Jurnal Ilmu Pertanian Indonesia (in Indonesian). 20 (1): 78–84.CS1 maint: uses authors parameter (link)
  5. J. Haig (1974). "A review of the Australian crabs of the family Hippidae (Crustacea, Decapoda, Anomura)" (PDF). Memoirs of the Queensland Museum. 71: 175–189.
  6. M. Osawa. "Hippa adactyla Fabricius, 1787". BiotaTaiwanica. Retrieved 24 January 2016.
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