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Diogenes canaliculatus

Scientific Name:-
Diogenes canaliculatus

Common Name:-

Malayalam Name:-

Category:-
Hermit crabs

Status:-
Not evaluated


Description:-

Shield 1.1 times longer than broad, suboctogonal; anterior margin between rostrum and lateral projections slightly concave, smooth or bearing 1–4 tiny tubercles near each base of lateral projection; anterolateral margins sloping, slightly tuberculate; posterior margin roundly truncate; dorsal surface with some transverse spinulose ridges laterally. Rostrum obtuse. Ocular peduncles equal in length, about 0.7 times as long as shield, moderately stout, not inflated basally; cornea not dilated. Antennular peduncle overreaching distal corneal margin by 0.8–0.9 length of ultimate segment and extending as far as antennal peduncle. Antennal peduncle overreaching distal corneal margins by 0.8–0.9 length of fifth segment. Third maxilliped moderately slender. Carpus unarmed on dorsodistal margin. Ischium-basis fused segment with 4 strong, corneous-tipped spines (2 on ischium and 2 on basis) on mesial margin. Left cheliped (Figs. 51C, 52B) moderately large, not particularly elongate in male. Chela strongly compressed. Dactylus distinctly longer than palm; upper margin with double row of small tubercles or spines, becoming single row in distal half; outer surface usually with deep furrow medially and blunt ridge along cutting edge, having scattered granules (these granules larger on lower ridge); cutting edge sinuous, with single row of small blunt calcareous teeth increasing in size proximally; inner surface with median row of tiny tubercles in proximal half, row of small tubercles adjacent to upper margin, and with shallow sulcus proximally. Right cheliped moderately stout, with numerous tufts of long setae, particularly on dorsal side; broad hiatus between fingers. Ambulatory legs generally similar, but third pair slightly longer than second pair. Shield light brown or tan generally; posterior carapace translucent. Ocular peduncles generally light brown, with tinge of darker brown proximal to base of cornea; no distinct markings otherwise. Named after the longitudinal furrows on the outer surface of the dactylus and palm of the left chela.

Threats:-

Not recorded

Remark:-

This species was described from Kerala coast Komai et al. (2013).

Habitat:-

Coastal waters

Synonyms:-

Diogenes bicristimanus. –– Tirmizi & Siddiqui 1982: 52, figs 27, 28.

References:-

Komai, T., Reshmi, R. and Biju Kumar, A. (2013). A new species of the hermit crab genus Diogenes (Crustacea: Decapoda: Anomura: Diogenidae) from southern India. Zootaxa, 3613: 380-390.
Reshmi, R. (2014). Taxonomy and diversity of anomuran crabs (Decapoda: Anomura) of Kerala coast. PhD Thesis submitted to University of Kerala, India.




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