Observation of museum specimens of the genus Pacifastacus Bott, 1950 (Decapoda: Astacidae)

Kawai, Tadashi

doi:10.1590/2358-2936e2018001

Tadashi Kawai

Wakkanai Fisheries Institute. 4-5-15 Suehiro, Wakkanai, Hokkaido 097-0001, Japan.

http://orcid.org/0000-0001-5988-0493

Corresponding author: Tadashi Kawai. E-mail: kawai-tadashi@hro.or.jp

Figures (6)
Tables (2)

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Figure 1
Pacifastacus leniusculus leniusculus (Dana, 1852Dana, J.D. 1852. United States Exploring Expedition During the Years 1838 to 1842 Under the Command of Charles Wikes U.S.N. Crustacea, Vol. 13. Philadelphia, C. Sherman, 1620p.): all figures from syntypic male (USNM 44408). A, Dorsal view of carapace; B, dorsal view of rostrum; C, cephalolateral view of carapace; D, lateral view of second to fourth pleonal somites; E, dorsal view of left cheliped. Scale bars = 2 mm.

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Figure 2
Pacifastacus leniusculus leniusculus (Dana, 1852Dana, J.D. 1852. United States Exploring Expedition During the Years 1838 to 1842 Under the Command of Charles Wikes U.S.N. Crustacea, Vol. 13. Philadelphia, C. Sherman, 1620p.): all figures from syntypic male (USNM 44408). A, Epistome and base of antennae; B, distocaudal view of denticle of mandible; C, dorsal view of antennal scale; D, ventral view of third maxilliped; E, dorsal view of merus of third maxilliped; F, proximal podomeres of pereiopods; G, mesial view of first pleopod; H, lateral view of first pleopod (gonopod); I, ventral view of first pleopod; J, ventral view of distal portion of first pleopod; K, dorsal view of telson and uropods. Scale bars = 2 mm, except B = 0.5 mm.

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Figure 3
Pacifastacus leniusculus klamathensis (Stimpson, 1857Stimpson, W. 1857. Notice of new species of Crustacea in Western North America; being an abstract from a paper to be published in the Journal of the Society. Proceedings of Boston Society of Natural History, 6: 84-89.). Lot SMF 1437: current label, male #3, and female (upper); male #3 (lower).

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Figure 4
Pacifastacus leniusculus klamathensis (Stimpson, 1857Stimpson, W. 1857. Notice of new species of Crustacea in Western North America; being an abstract from a paper to be published in the Journal of the Society. Proceedings of Boston Society of Natural History, 6: 84-89.) (SMF 1437). A, Dorsal view of carapace; B, dorsal view of rostrum; C, epistome and base of antennae; D, lateral view of second to fourth pleonal somites; E, edorsal view of cheliped; F, dorsal view of merus of third maxilliped; G, ventral view of gonopod (first pleopod); H, mesial view of second pleopod; I, lateral view of second pleopod. Scale bars = 2 mm.

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Figure 5
Pacifastacus leniusculus trowbridgii (Stimpson, 1857Stimpson, W. 1857. Notice of new species of Crustacea in Western North America; being an abstract from a paper to be published in the Journal of the Society. Proceedings of Boston Society of Natural History, 6: 84-89.): all figures from syntypic male #1 (USNM 2080). A, Dorsal view of carapace; B, dorsal view of rostrum; C, cephalolateral view of carapace; D, dorsal view of cheliped; E, lateral view of second to fifth pleonal somites; F, dorsal view of telson and uropods. Scale bars = 2 mm.

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Figure 6
Pacifastacus leniusculus trowbridgii (Stimpson, 1857Stimpson, W. 1857. Notice of new species of Crustacea in Western North America; being an abstract from a paper to be published in the Journal of the Society. Proceedings of Boston Society of Natural History, 6: 84-89.): all figures from syntypic male #1 (USNM 2080) except J, from syntypic female #1 (USNM 2080). A, Distocaudal view of denticle of mandible; B, dorsal view of antennal scale; C, dorsal view of merus of third maxilliped; D, proximal podomeres of pereiopods; E, mesial view of first pleopod; F, mesial view of distal portion of first pleopod; G. lateral view of distal portion of first pleopod; H, mesial view of second pleopod; I, lateral view of second pleopod; J, caudal thoracic sternal area of female. Scale bars = 2 mm, except A = 0.5 mm.

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Table 1
Measurements (mm) of the syntypes of Pacifastacus leniusculus leniusculus (Dana, 1852Dana, J.D. 1852. United States Exploring Expedition During the Years 1838 to 1842 Under the Command of Charles Wikes U.S.N. Crustacea, Vol. 13. Philadelphia, C. Sherman, 1620p.) deposited at the National Museum of Natural History (USNM) and male specimen of P. leniusculus klamathensis (Stimpson, 1857Stimpson, W. 1857. Notice of new species of Crustacea in Western North America; being an abstract from a paper to be published in the Journal of the Society. Proceedings of Boston Society of Natural History, 6: 84-89.) deposited at the Forschungsinstitut und Naturmuseum Senckenberg (SMF).

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Table 2
Measurements (mm) of the syntypes (USNM 2080) of Pacifastacus leniusculus trowbridgii (Stimpson, 1857Stimpson, W. 1857. Notice of new species of Crustacea in Western North America; being an abstract from a paper to be published in the Journal of the Society. Proceedings of Boston Society of Natural History, 6: 84-89.).

Structures	Male#1 syntype USNM 2161	Male#2 syntype USNM 2019	Male #3 syntype USNM 44408	Male#3 SMF 1437
Carapace
Total length	30.0	-	45.6	42.0
Postorbital length	21.2	34.6	33.4
Length cephalic	29.1	-	32.6
Width		21.4	21.3	21.8
Depth	10.8	14.2	16.1	16.9
Length rostrum	8.9	-	13.9
Length acumen	4.2	-	6.5
Length areola	8.2	12.8	13.0
Width areola	4.2	6.9	6.5
Antennal scale
Length	6.9	10.3	9.6
Width	2.7	4.4	4.1
Abdomen
Length	28.1	41.6	41.7
Width	13.0	20.9	20.4	13.4
Cheliped
Length lateral	21.7	33.3	36.6	38.0
margin chela
Length mesial	6.8	9.4	11.1	12.5
margin palm
Width palm	8.6	12.3	15.2
Depth palm	4.8	6.4	8.3	9.8
Length dactyl	11.7	20.1	20.7	21.8
Length carpus	6.8	10.9	12.0
Width carpus	5.8	8.2	9.6
Length dorsal	9.0	16.2	16.0	17.8
margin merus
Greatest depth	5.0	7.9	7.4
merus
Gonopod length	8.3	11.2	12.5	10.8

Structures	Male #1	Female #1	Male #2
Carapace
Total length	61.7	42.5	44.8
Postorbital length	49.3	33.0	33.9
Length cephalic section	40.8	29.1	31.0
Width	32.0	21.8	21.3
Depth	23.7	15.3	15.9
Length rostrum	13.2	9.2	11.5
Length acumen	5.8	4.9	5.0
Length areola	20.9	13.4	13.8
Width areola	8.3	5.2	7.2
Antennal scale
Length	10.3	7.9	9.8
Width	5.0	3.9	3.6
Abdomen
Length	53.9	42.2	39.8
Width	28.8	24.3	19.7
Cheliped
Length lateral	66.4	35.8	42.3
margin chela
Length mesial	26.4	12.0	15.0
margin palm
Width palm	29.2	16.5	17.9
Depth palm	17.4	9.5	10.5
Length dactyl	35.9	18.9	23.1
Length carpus	20.0	12.0	13.7
Width carpus	18.4	11.3	11.7
Length dorsal	24.3	14.8	17.7
margin merus
Greatest depth	13.7	8.8	9.0
merus
Gonopod length	15.7	12.3	N/A

[1] Corresponding author: Tadashi Kawai. E-mail: kawai-tadashi@hro.or.jp

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Observation of museum specimens of the genus Pacifastacus Bott, 1950 (Decapoda: Astacidae)

Abstract