Eogammarus psammophilus Bousfield, 1979
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publication ID |
https://doi.org/ 10.1080/00222930600828859 |
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publication LSID |
lsid:zoobank.org:pub:41F5583D-BD6D-4FFF-961F-39AA6A6ECCE8 |
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persistent identifier |
https://treatment.plazi.org/id/BF741C1D-B234-5714-FEE2-8018FEAAA96D |
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treatment provided by |
Felipe |
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scientific name |
Eogammarus psammophilus Bousfield, 1979 |
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Eogammarus psammophilus Bousfield, 1979 View in CoL
( Figures 22–25 View Figure 22 View Figure 23 View Figure 24 View Figure 25 ) [Japanese name: Sunaji togeo yokoebi, new] Eogammarus psammophilus Bousfield 1979, p 315 –316, Figure 3 View Figure 3 .
Material examined
USA. Paratype: 1♀, 16.0 mm, CMNC 1982-0321 , Southwestern Constantine Harbor (51 ° 249N, 179 ° 179E), Amchitka Island, Aleutian Islands , 30 October 1971, collected by P. N. Slattery. 1 „, 20.0 mm, CMNC 2004-1029 , Kenai Peninsula Borough (65 ° 459N, 167 ° 519W), Alaska, USA, 16 July 1984, collected by P. N. Slattery.
Description of male (20.0 mm from Alaska, CMNC 2004-1029)
Antenna 1 ( Figure 22A View Figure 22 ): peduncular articles 1:2: 3 in ratio of 1.0:0.8:0.4; article 1 with long posterodistal seta in place of robust seta, posterior margin with two setae; article 2 posterior margin with three clusters of setae; article 3 posterior margin with cluster and pair of setae; accessory flagellum five-articulate; primary flagellum 20-articulate, each article with one short aesthetasc ( Figure 22B View Figure 22 ). Antenna 2 ( Figure 22C View Figure 22 ): peduncular article 1 with long slender setae; articles 4: 5 in ratio of 1.0:1.1; posterior margin of article 4 with three clusters and one pair of setae; posterior margin of article 5 with five clusters of setae; flagellum 12- articulate, with calceoli, width of calceoli 0.4× width of flagellar article ( Figure 22D View Figure 22 ).
Coxae 1–4 ( Figure 23A, C, E, F View Figure 23 ): with long, setose lower margins.
Mandible ( Figure 22G, H View Figure 22 ): palp article 2 with numerous marginal and submarginal setae; article 3 length 0.8× article 2 length, with four clusters of A-setae and cluster of B-setae. Maxilla 1 ( Figure 22I View Figure 22 ): inner plate with 17 plumose setae medially; palp article 1 with plumose seta on outer margin; article 2 with six plumose setae on outer margin, eight stout and 10 slender setae apically. Maxilla 2 ( Figure 22J View Figure 22 ): inner plate with 17 facial setae. Maxilliped ( Figure 22K View Figure 22 ): inner and outer plate relatively short, not reaching distal end of palp article 1 and middle of palp article 2, respectively; inner plate with three apical and two medial bent, stout setae; outer distal corner of palp article 2 with cluster of slender setae.
Gnathopod 1 ( Figure 23A View Figure 23 ): anterior margin of propodus with four clusters of setae, palmar margin ( Figure 23B View Figure 23 ) lined with 19 inner and 10 outer robust, striated peg setae. Gnathopod 2 ( Figure 23C View Figure 23 ): anterior margin of propodus with three clusters of setae, palmar margin ( Figure 23D View Figure 23 ) lined with nine inner and nine outer robust, striated peg setae.
Pereopods 3–7: both margins of basis–carpus with long plumose setae. Pereopod 3 ( Figure 23E View Figure 23 ): merus, carpus, and propodus in ratio of 1.0:0.7:0.7. Pereopod 4 ( Figure 23F View Figure 23 ): merus, carpus, and propodus in ratio of 1.0:0.7:0.7. Pereopod 6 ( Figure 23H View Figure 23 ): longest posteromarginal seta of basis 1.1× width of ischium. Pereopod 7 ( Figure 23I View Figure 23 ): longest posteromarginal seta of basis 1.2× width of ischium.
Pleopods ( Figure 24D View Figure 24 ): retinacula triplicated ( Figure 24E View Figure 24 ). Epimera 1–3 ( Figure 24E–G View Figure 24 ): with plumose setose anteroventral margins, posterior margins with numerous simple setae.
Uropod 1 ( Figure 24A View Figure 24 ): inner ramus length 0.7×, outer ramus length 0.8× peduncle length, latter with robust and slender marginal setae and robust basofacial seta; inner ramus with one robust and two slender setae on inner margin; outer ramus with one inner and one outer robust marginal seta. Uropod 2 ( Figure 24B View Figure 24 ): inner ramus length 0.8×, outer ramus length 0.7× peduncle length, latter with robust and slender marginal setae; inner ramus with one robust and one slender seta on inner margin; outer ramus with margin bare. Uropod 3 ( Figure 24C View Figure 24 ): inner ramus length 0.3× outer ramus length; outer margin of outer ramus with one cluster and three pairs of robust setae, a single robust seta, and a few simple and 10 plumose setae; inner margin with two pairs of robust setae, a few simple and numerous plumose setae; length of terminal article of outer ramus 0.2× proximal article length. Telson ( Figure 24I View Figure 24 ): length 0.9× width, with robust apical and distolateral setae, slender apical setae, and penicillate distolateral setae, robust apical setae about as long as slender apical setae; cleft 65%.
Description of female (16.0 mm from Amchitka Island, paratype, CMNC 1982-0321)
Antenna 1 ( Figure 25A View Figure 25 ): peduncular articles 1:2: 3 in ratio of 1.0:0.7:0.5; article 1 posterior margin with two clusters and one pair of setae and a single seta; article 2 posterior margin with two clusters and one pair of setae and a single seta; article 3 posterior margin with one cluster and one pair of setae; accessory flagellum five-articulate; primary flagellum 24-articulate, each article with one aesthetasc. Antenna 2 ( Figure 25B View Figure 25 ): peduncular articles 4: 5 in ratio of 1.0:1.2; posterior margin of article 4 with four clusters of setae; posterior margin of article 5 with five clusters of setae; flagellum 14-articulate, lacking cupcalceoli.
Coxa 1 ( Figure 25C View Figure 25 ): with densely setose inner face.
Gnathopod 1 ( Figure 25C View Figure 25 ): anterior margin of propodus with four clusters of setae and a single seta, palmar margin ( Figure 25D View Figure 25 ) with 10 robust simple setae on inner part and three robust simple setae on outer distal part. Gnathopod 2 ( Figure 25E View Figure 25 ): anterior margin of propodus with three clusters of setae, palmar margin ( Figure 25F View Figure 25 ) with five simple and five robust pectinate setae on inner part, five simple and three stiff pectinate setae on outer part.
Pereopod 6 ( Figure 25H View Figure 25 ): longest posteromarginal seta of basis 1.3× width of ischium. Pereopod 7 ( Figure 25I View Figure 25 ): longest posteromarginal seta of basis 1.1× width of ischium.
Uropod 3 ( Figure 25K View Figure 25 ): inner ramus length 0.3× outer ramus length; outer margin of outer ramus with one cluster and two pairs of robust setae, a few simple and numerous plumose setae; inner margin with robust seta and numerous plumose setae; terminal article of outer ramus length 0.2× proximal article length.
Variation
The number of clusters of setae on peduncular articles of both antennae 1 and 2 varies from zero to five. The number of clusters of robust setae on the outer margin of the ramus of uropod 3 varies from three to four.
Remarks
Eogammarus psammophilus is similar to E. schmidti ( Derzhavin, 1927) , as Bousfield (1979) mentioned. These two species are distinct from their congeners by their thick antennae; densely setose gnathopods, pereopods, and epimeron; and the triplicated retinacula on pleopods. Eogammarus psammophilus is distinguished from E. schmidti by the following features ( E. schmidti in parentheses): (1) on antenna 1, the aesthetasc is shorter than the surrounding setae (longer) and (2) on antenna 2, the calceolus is wider than 0.25× the article width (narrower) (see Table I).
Distribution
Amchitka Island ( Aleutian Islands ), Kenai Peninsula Borough (Alaska) .
Habitat
Intertidal zone.
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