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

Joseph POUPIN

Confirmatory characters, including color

Characters: 26 in data, 16 included, 15 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: 3–13 16 18 20–21 24
Character reliabilities: 3,9.0 4,3.0 5,2.0 6–7,8.0 8,2.0 9,7.0 10,2.0 11–12,6.0 13,7.0 14,3.0 16,4.0 17,2.0 18,4.0 20,4.0 22,2.0 24,10.0

1(0).
  • Indo-West Pacific ... 2
  • East Pacific... 24
  • West Atlantic... 26
  • East Atlantic... 28

2(1).
  • Ocular scale with a single terminal spine ... 3
  • Ocular scale with several terminal spines... 17

3(2).
  • Left lobe of telson unarmed ... Calcinus tropidomanus
  • Left lobe of telson with a single spine... 4
  • Left lobe of telson with several spines disposed on posterior margin only... 13
  • Left lobe of telson with several spines disposed on posterior and lateral margins... 16

4(3).
  • Outer face of left palm regularly convex ... 5
  • Outer face of left palm with longitudinal depression(s)... 12
  • Outer face of left palm with 2-3 subcircular depressions... Calcinus imperialis

5(4).
  • Upper margin of right chela smooth ... 6
  • Upper margin of right chela tuberculated or spinous... 7

6(5).
  • Dorsolateral margins of P3 propodi slightly carinated ... Calcinus seurati
  • Dorsolateral margins of P3 propodi rounded... Calcinus laevimanus

7(5).
  • Distal pilosity of P3 weak, similar to distal P2 ... 8
  • 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... 9

8(7).
  • Ambulatory legs (P2 & P3) without ring(s) or spot(s); distal antennular peduncle brown ... Calcinus dapsiles
  • Ambulatory legs (P2 & P3) with spots; distal antennular peduncle white to cream... Calcinus albengai

9(7).
  • Ambulatory legs (P2 & P3) without ring(s) or spot(s) ... 10
  • Ambulatory legs (P2 & P3) with spots... 11
  • Ambulatory legs (P2 & P3) with longitudinal bands... Calcinus anani

10(9).
  • Ocular peduncle uniformly colored; species of normal size, i.e. shield length often greater than 2-3 mm; anterodorsal plate of branchiostegite with row of spinules on dorsal margin ... Calcinus kurozumii
  • Ocular peduncle multicolored without narrow ring close to cornea; small species, shield length does not exceed 2-3 mm; anterodorsal plate of branchiostegite unarmed on dorsal margin or with 1-2 spinules subproximally... Calcinus revi

11(9).
  • Distal antennular peduncle purple or burgundy; chela with several spots; species of normal size, i.e. shield length often greater than 2-3 mm ... Calcinus argus
  • Distal antennular peduncle yellow-orange; chela uniformly colored, often grading to paler distally; small species, shield length does not exceed 2-3 mm... Calcinus areolatus

12(4).
  • Distal pilosity of P3 weak, similar to distal P2; ventral margin of P3 dactyl with 10 spines or more; ambulatory legs (P2 & P3) without ring(s) or spot(s) ... Calcinus vanninii
  • Distal pilosity of P3 dense, forming a brush of setae; ventral margin of P3 dactyl with less than 10 spines; ambulatory legs (P2 & P3) with ring(s)... Calcinus isabellae

13(3).
  • 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... 14

14(13).
  • Ambulatory legs (P2 & P3) without ring(s) or spot(s) ... 15
  • Ambulatory legs (P2 & P3) with ring(s)... Calcinus orchidae
  • Ambulatory legs (P2 & P3) with spots and ring(s)... Calcinus elegans

15(14).
  • Distal antennular peduncle black ... Calcinus morgani
  • Distal antennular peduncle blue or dark blue... Calcinus gaimardii

16(3).
  • Distal pilosity of P3 weak, similar to distal P2; ambulatory legs (P2 & P3) with longitudinal bands; chela with brown, dark orange or red patches ... Calcinus pascuensis
  • Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae; ambulatory legs (P2 & P3) with ring(s); chela uniformly colored, often grading to paler distally... Calcinus spicatus

17(2).
  • Left lobe of telson with several spines disposed on posterior margin only ... 18
  • Left lobe of telson with several spines disposed on posterior and lateral margins... 20

18(17).
  • Distal antennular peduncle white to cream ... Calcinus minutus
  • Distal antennular peduncle blue or dark blue... 19
  • Distal antennular peduncle yellow-orange... Calcinus nitidus

19(18).
  • Ambulatory legs (P2 & P3) without ring(s) or spot(s) ... Calcinus rosaceus, Calcinus hazletti
  • Ambulatory legs (P2 & P3) with spots... Calcinus haigae

20(17).
  • Ambulatory legs (P2 & P3) without ring(s) or spot(s) ... 21
  • Ambulatory legs (P2 & P3) with ring(s)... 22
  • Ambulatory legs (P2 & P3) with ring(s) and longitudinal bands... Calcinus lineapropodus, Calcinus pulcher

21(20).
  • Ocular peduncle multicolored with narrow ring close to cornea ... Calcinus laurentae
  • Ocular peduncle multicolored without narrow ring close to cornea... Calcinus vachoni

22(20).
  • Distal pilosity of P3 weak, similar to distal P2; chela uniformly colored, often grading to paler distally ... 23
  • Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae; chela with submedian patch or spot on outer face... Calcinus gouti

23(22).
  • Distal antennular peduncle black; dactyl of P3 distinctly shorter than propodus ... Calcinus guamensis
  • Distal antennular peduncle white-violet; dactyl of P3 subequal to propodus or slightly shorter... Calcinus hakahau

24(1).
  • Ocular scale with a single terminal spine; dorsolateral margins of P3 propodi rounded ... 25
  • Ocular scale with several terminal spines; dorsolateral margins of P3 propodi slightly carinated... Calcinus obscurus

25(24).
  • Ambulatory legs (P2 & P3) without ring(s) or spot(s); ocular peduncle multicolored with narrow ring close to cornea ... Calcinus californiensis
  • Ambulatory legs (P2 & P3) with ring(s); ocular peduncle uniformly colored... Calcinus explorator

26(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... 27

27(26).
  • Distal pilosity of P3 weak, similar to distal P2; chela with brown, dark orange or red patches ... Calcinus verrilli
  • Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae; chela uniformly colored, often grading to paler distally... Calcinus urabaensis

28(1).
  • Upper margin of right chela smooth; dactyl of P3 distinctly shorter than propodus ... Calcinus talismani
  • Upper margin of right chela tuberculated or spinous; dactyl of P3 subequal to propodus or slightly shorter... 29

29(28).
  • Chela uniformly colored, often grading to paler distally; small species, shield length does not exceed 2-3 mm ... Calcinus paradoxus
  • Chela with brown, dark orange or red patches; 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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