Key to hermit crabs Calcinus of the world (Anomura: Diogenidae)

Joseph POUPIN

Confirmatory characters, no color

Characters: 26 in data, 9 included, 9 in key.
Items: 43 in data, 43 included, 43 in key.
Parameters: Rbase = 1.40 Abase = 2.00 Reuse = 1.01 Varywt = .80
Characters included: 3–4 6–7 9 11–13 24
Character reliabilities: 3,9.0 4,3.0 5,2.0 6,9.0 7,8.0 9,8.0 10,2.0 11–12,2.0 13,4.0 14,3.0 17,2.0 21–22,2.0 24,10.0

1(0).
  • Indo-West Pacific ... 2
  • East Pacific... 14
  • West Atlantic... 15
  • East Atlantic... 17

2(1).
  • Ocular scale with a single terminal spine ... 3
  • Ocular scale with several terminal spines... 12

3(2).
  • Upper margin of right chela smooth ... 4
  • Upper margin of right chela tuberculated or spinous... 5

4(3).
  • Dorsolateral margins of P3 propodi slightly carinated ... Calcinus seurati
  • Dorsolateral margins of P3 propodi rounded... Calcinus laevimanus

5(3).
  • Outer face of left palm regularly convex ... 6
  • Outer face of left palm with longitudinal depression(s)... 11
  • Outer face of left palm with 2-3 subcircular depressions... Calcinus imperialis

6(5).
  • Left lobe of telson unarmed ... Calcinus tropidomanus
  • Left lobe of telson with a single spine... 7
  • Left lobe of telson with several spines disposed on posterior margin only... 9
  • Left lobe of telson with several spines disposed on posterior and lateral margins... 10

7(6).
  • Distal pilosity of P3 weak, similar to distal P2 ... Calcinus dapsiles, Calcinus albengai
  • Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae... Calcinus sirius
  • Distal pilosity of P3 dense, forming a brush of setae... 8

8(7).
  • small species, shield length does not exceed 2-3 mm ... Calcinus revi, Calcinus areolatus
  • species of normal size, i.e. shield length often greater than 2-3 mm... Calcinus argus, Calcinus anani, Calcinus kurozumii

9(6).
  • Distal pilosity of P3 weak, similar to distal P2 ... Calcinus inconspicuus
  • Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae... Calcinus latens
  • Distal pilosity of P3 dense, forming a brush of setae... Calcinus orchidae, Calcinus gaimardii, Calcinus morgani, Calcinus elegans

10(6).
  • Distal pilosity of P3 weak, similar to distal P2 ... Calcinus pascuensis
  • Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae... Calcinus spicatus

11(5).
  • Distal pilosity of P3 weak, similar to distal P2; ventral margin of P3 dactyl with 10 spines or more ... Calcinus vanninii
  • Distal pilosity of P3 dense, forming a brush of setae; ventral margin of P3 dactyl with less than 10 spines... Calcinus isabellae

12(2).
  • Left lobe of telson with several spines disposed on posterior margin only ... Calcinus minutus, Calcinus rosaceus, Calcinus nitidus, Calcinus haigae, Calcinus hazletti
  • Left lobe of telson with several spines disposed on posterior and lateral margins... 13

13(12).
  • Distal pilosity of P3 weak, similar to distal P2 ... Calcinus hakahau, Calcinus lineapropodus, Calcinus pulcher, Calcinus guamensis
  • Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae... Calcinus laurentae, Calcinus gouti, Calcinus vachoni

14(1).
  • Ocular scale with a single terminal spine; dorsolateral margins of P3 propodi rounded ... Calcinus californiensis, Calcinus explorator
  • Ocular scale with several terminal spines; dorsolateral margins of P3 propodi slightly carinated... Calcinus obscurus

15(1).
  • Upper margin of right chela smooth; dorsolateral margins of P3 propodi slightly carinated; left lobe of telson with a single spine ... Calcinus tibicen
  • Upper margin of right chela tuberculated or spinous; dorsolateral margins of P3 propodi rounded; left lobe of telson with several spines disposed on posterior margin only... 16

16(15).
  • Distal pilosity of P3 weak, similar to distal P2 ... Calcinus verrilli
  • Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae... Calcinus urabaensis

17(1).
  • Upper margin of right chela smooth ... Calcinus talismani
  • Upper margin of right chela tuberculated or spinous... 18

18(17).
  • small species, shield length does not exceed 2-3 mm ... Calcinus paradoxus
  • species of normal size, i.e. shield length often greater than 2-3 mm... Calcinus tubularis




Cite this publication as: J. Poupin (2003, Internet). - Hermit crabs Calcinus of the world (Anomura, Diogenidae). Descriptions, Illustrations, Identification, and Information Retrieval, using the DELTA format.

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