Lamyctes tristani ( Pocock, 1893 )
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publication ID |
https://doi.org/ 10.1080/00222933.2024.2395903 |
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DOI |
https://doi.org/10.5281/zenodo.14240616 |
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persistent identifier |
https://treatment.plazi.org/id/BE5787BE-AB04-045E-FE1C-FDA3604C79B9 |
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treatment provided by |
Plazi |
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scientific name |
Lamyctes tristani ( Pocock, 1893 ) |
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Lamyctes tristani ( Pocock, 1893) View in CoL
( Figures 5 View Figure 5 , 6 View Figure 6 )
Material examined
2 adult ♀♀, NHMUK015626352 About NHMUK , Diego Garcia, Downtown, 7.263°S, 72.374°E, 26 June 2022, leg. W. Rabitsch, suction sampler; GoogleMaps 1 adult ♀, NHMUK015619670 About NHMUK , Diego Garcia, wetland site, 7.310°S, 72.419°E, 22 June 2022, leg. W. Rabitsch, suction sampler. GoogleMaps
Description
Body length up to 6.5 mm. Colour in ethanol: Cephalic shield and tergites uniformly dark brown, legs light brown with violet distal articles. No dark colouration around the ocellus and anterior margin of the cephalic shield.
Cephalic plate. Frontal margin with evident medial notch, lacking a median furrow, ocellus present ( Figure 5 View Figure 5 (A)). Posterior margin of cephalic shield weakly concave, with evident margination. Antennae of two specimens with 18–20 ( Figure 5 View Figure 5 (C)) and 21–24 articles respectively, 2.75 times longer than cephalic shield and 31% of body length. Ultimate antennal articles generally as long as or shorter than the penultimate ( Figure 5 View Figure 5 (B)). Pairs of articles 3–4, 6–7, 9–10, 12–13, 15–16, 18–19 relatively shortened.
Forcipular coxosternite. Subtrapezoidal with weak shoulder and gently converging lateral margin ( Figure 6 View Figure 6 (A,B)). Anterior margin with 2 + 2 teeth and a short, spinous pseudoporodont ( Figures 5 View Figure 5 (D), 6(C)). Pseudoporodont displaced proximally to teeth. Median diastema 1.7 times wider than the gap between teeth, narrowed medially. Long setae clustered near anterior margin and on the internal side of forcipular articles.
Trunk ( Figure 5 View Figure 5 (E)). All tergites with rounded posterior angles and without projections. Posterior margins weakly concave. Large tergites with complete posterior margination.
Legs. Distal spinous projection on leg pairs 1–12. Projection of tibia 12 short and rounded ( Figure 5 View Figure 5 (F)). Coxal pores on legs 12–15 arranged as 3, 3, 3, 4/3, 3, 4, 4 (NHMUK015626352). Middle two pores variably share an opening despite having separate channels. Telopodite of ultimate legs slender and elongate; tarsus 1 21% and tarsus 2 17% of its length ( Figure 5 View Figure 5 (G)).
Gonopods. Female gonopods with 2 + 2 spurs and simple claw ( Figure 5 View Figure 5 (H)). Article I with 13–14 setae, article II with 5–6 setae and article III with 1–2 setae. Male not known from Chagos samples ( Figure 6 View Figure 6 (F,G), for male gonopods of a syntype from Tristan da Cunha).
COI barcode. GenBank accession number PQ165824.
Remarks. Specimens from Diego Garcia compare closely with Lamyctes tristani , originally described from Tristan da Cunha ( Pocock 1893; Lawrence 1956) and subsequently reported from Madagascar ( Lawrence 1960). Among taxonomically informative similarities are the number of antennal articles (usually 23 or 24 in L. tristani ), the blunt distal projection on the tibia of leg 12 ( Figures 5 View Figure 5 (F), 6(E)) and the female gonopods ( Figures 5 View Figure 5 (H), 6(H)), which all agree between the Chagos specimens and the type material of L. tristani . In both species, the distal spinous projection of the tibia is described as terminating on leg pair 11 ( Figure 6 View Figure 6 (D)).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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